CN104080533B - Honeycomb molded body - Google Patents

Abstract

This honeycomb molded body (1) has next door (11) and multiple unit (12).Being perpendicular in axial cross section at honeycomb molded body (1), honeycomb molded body (1) have radially from the center of alveolate texture (1) to it outside there are multiple cell density regions (2) of different units density.Borderline region (14) is arranged between adjacent cell density region (2), separates described region (2).Described borderline region (14) has with lower part: connect the next door, border (141) in the next door (11) in cell density region (2) in both sides；With multiple Polygonal Boundary unit (142), each shape being surrounded and being formed with the unit (12) being different from the cell density region (2) of both sides at least in part by next door, border (141) in Polygonal Boundary unit.The averaged hydraulic diameter (Φ 2) of the averaged hydraulic diameter (Φ 1) of the boundary element (142) in borderline region (14) and the unit (12) in the cell density region (2) of the immediately inner side of borderline region (14) meets Φ 1/ Φ 2 >=the relation of 1.25.

Description

Honeycomb molded body

Technical field

The present invention relates to a kind of honeycomb molded body for support component, described support component supports energy The catalyst of the waste gas of enough engine exhausts purified from motor vehicles etc..

Background technology

Known a kind of honeycomb molded body can purify the waste gas of the engine exhaust from motor vehicles etc., Catalyst is supported in described alveolate texture body.Such as, honeycomb molded body is by being arranged to grid Next door and the multiple unit formed by described next door of shape form.Honeycomb molded body is installed to waste gas The exhaust steam passage of process.It is installed to the honeycomb molded body of exhaust steam passage when the waste gas with high temperature flows through Time, the catalyst being supported in alveolate texture body is activated by the waste gas with high temperature.Be activated urges Agent purifies waste gas.

At present, because becoming more strict year by year for reducing the vehicle emission control of motor vehicles discharge, Have for reducing the strong of the harmful substance (cold type is put) that produces the most immediately further Demand.In order to solve this problem, need to use for reducing the thickness in each next door to reduce honeycomb The gross weight of shape structure and the temperature of honeycomb molded body is quickly increased to target temperature to activate and urging The technology of agent.Need further exist for using for having even velocity of flow and the offer of equally distributed waste gas To the technology of honeycomb molded body to effectively utilize the whole catalysis supported by honeycomb molded body Agent.To this end, require that honeycomb molded body has preferably purification waste gas performance and the low pressure loss and (goes back Hint is referred to as the pressure loss) etc..

Such as, patent documentation 1 has been disclosed for a kind of being perpendicular to the axial horizontal stroke of honeycomb molded body There is in cross section the honeycomb molded body of central area and outer region.Patent documentation 1 has determined that in The relation of catalytic amount, surface area, cell density etc. between central area and outer region.And, Patent documentation 2 has been disclosed for a kind of by having the inner peripheral wall of tubular, first module and second unit The honeycomb molded body of composition.In this structure, first module has and is arranged in inside inner peripheral wall Hexagonal shape.Second unit have be different from hexagonal shape shape (circular, oval, Squares and triangles) and it is disposed in the outside of inner peripheral wall.Additionally, patent documentation 3 is Disclose a kind of honeycomb molded body being made up of the unit with square shape and at alveolate texture The relation of aperture efficiency and absorptance etc. between central area and the outer region of body.

Patent documentation 4 has been disclosed for a kind of honeycomb molded body having a structure in which, at this knot In structure, surface region, inner side is formed on first module region (as central area) and second unit Between region (as outer region).Patent documentation 4 has determined that in first module region and second The relation of cell density etc. between unit area.And, patent documentation 5 has been disclosed for one to be had The honeycomb molded body of such structure, in the structure shown here, grid framework (it is, next door) from Central area is formed towards outer region, and the quantity of grid framework is along the footpath of honeycomb molded body To change.Further, patent documentation 6 has been disclosed for the structure of a kind of honeycomb molded body, In this structure, next door has the shape protruded from central point, and the unit of central area towards outside Density is less than the cell density of outer region.Further, patent documentation 7 has been disclosed for a kind of honeybee The structure of nest shape structure, in the structure shown here, the aperture efficiency of unit connects from central area to outer region Or increase step by step continuously.

Further, patent documentation 8 discloses a kind of honeycomb molded body having a structure in which, In the structure shown here, the first cellular zone (as central area) and the second cellular zone are (as periphery Region) it is directly assembled to together to form integrally formed body, and the first cellular zone and the second honeybee Nest region has different cell densities, different next door thickness, different cell cross-section shapes etc.. Further, patent documentation 9 has been disclosed for a kind of by being assemblied together with the multiple honeybee of shape all-in-one-piece The honeycomb molded body of nest section composition.Patent documentation 9 has determined that in and forms outer-most peripheral edge surface Outermost honeycomb sections and be formed without the septal wall thickness of other honeycomb sections of outer-most peripheral edge surface, unit The relation of density etc..And, patent documentation 10 discloses a kind of has the cellular of such region Structure, in this region, cell density is gradually reduced from centrally directed periphery.

[reference listing]

[patent documentation]

[patent documentation 1] JP 2002-177794 publication；

[patent documentation 2] JP 2008-200605 publication；

[patent documentation 3] JP 2008-18370 publication；

No. 3219292 publication of [patent documentation 4] special permission；

[patent documentation 5] special table 2009-532605 publication (the open Japanese Translator of PCT application)；

No. 4511396 publication of [patent documentation 6] special permission；

[patent documentation 7] JP 2006-281134 publication；

No. 4640903 publication of [patent documentation 8] special permission；

No. 4094823 publication of [patent documentation 9] special permission；With

No. 4332847 publication of [patent documentation 10] special permission.

Summary of the invention

Technical problem

But, the honeycomb molded body disclosed in patent documentation 1 to 5 has in central side and periphery The internal perisporium formed between region.The existence of internal perisporium produces to have has defect shape around internal perisporium The defective unit of shape.(defective unit is not only surrounded by next door, but by next door and the combination of internal perisporium Surround).Therefore, when catalyst is supported by honeycomb molded body, this structure will cause unit to be urged Agent is blocked and is blocked the pressure loss causing increasing honeycomb molded body by unit.And, although specially Profit document 3 has been disclosed for another of honeycomb molded body and does not have the structure of any internal perisporium, because The unit formed in central area and outer region is all of similar shape, and this provides and may reduce Resistance to sudden heating.

And, patent documentation 6 discloses the honeycomb molded body with this spline structure, in this structure In, because waste gas can easily flow in central area, waste gas is concentrated in central area, And this produces such part, and the cell density in described part is towards the outside in outer region Reduce unevenly.Therefore, the structure of this honeycomb molded body is in terms of in view of the flowing of waste gas pair Possible contribution is not had in purifying waste gas.And, patent documentation 6 is the openest about waste gas purification Any data.Further, because each in unit does not have circular accurately, waste gas is difficult to edge That honeycomb molded body flows longitudinally through the unit formed in outer region, it may be difficult to provide fully Exhaust-gas purifying performance.Further, the cellular knot that patent documentation 7 to 10 has a structure in which Structure body, in the structure shown here, multiple the plurality of cellular section is assembled to form integrally formed body.This Individual structure increases the thickness in the next door formed at the engaging zones of cellular section, and therefore increases honeybee The pressure loss of nest shape structure.

The present invention has completed to solve the problems referred to above and the target that has is to provide a kind of display The pressure loss reduced the honeycomb molded body of the exhaust-gas purifying performance that improvement is provided.

Technical scheme

According to an aspect of the present invention, honeycomb molded body is provided as including cloth by exemplary embodiment It is set to cancellate next door and the integrally formed body of multiple unit surrounded by next door.Honeycomb molded body Have borderline region and radially from central side to outer circumferential side formed there are the multiple of different units density Cell density region.Borderline region is formed between the cell density region of next-door neighbour.Borderline region has Next door, border and multiple boundary elements with polygonal shape.Next door, border connects and borderline region phase Adjacent and next door in the cell density region that formed.There is the boundary element of polygonal shape in shape It is different from the unit in cell density region.At least some of in boundary element is surrounded by next door, border. Honeycomb molded body meets the relation of Φ 1/ Φ 2 >=1.25, and wherein Φ 1 represents that the border in borderline region is single The averaged hydraulic diameter of unit, and Φ 2 represents the cell density district that directly inner side is formed at borderline region The averaged hydraulic diameter of the unit in territory.

The advantageous effects of the present invention

Aforesaid honeycomb molded body has multiple cell density region, the list in multiple cell density regions Unit's density be perpendicular to axial radially in cross section (also called hereinafter radial cross-section) It is altered in steps.Additionally, borderline region is formed between cell density region and makes cell density region Separate so that adjacent cell density region is separated.Borderline region has next door, border and has many Multiple boundary elements of limit shape shape.The unit that next door, border connects with borderline region is adjacent to be formed is close Next door in degree region.The boundary element with polygonal shape is different from shape at borderline region The cell density region that formed, both sides in unit, and each at least one in boundary element Divide and surrounded by next door, border.

It is, in aforesaid honeycomb molded body, borderline region is formed at the unit with change On border between the cell density region of density and there is the next door with cell density region and unit The next door (namely next door, border) being structurally similar and unit (namely boundary element).This Structure forms defective unit in making it possible to prevent the borderline region between cell density region.At this In the case of Zhong, this defective unit is formed in borderline region and is had less than at borderline region The hydraulic diameter of the hydraulic diameter of the unit in the cell density region that immediately inner side is formed.This structure Produce, in making it possible to the borderline region that suppression is formed between cell density region, the list that catalyst causes Unit's blocking.

Further, aforesaid honeycomb molded body meets the relation of Φ 1/ Φ 2 >=1.25, and wherein Φ 1 represents The averaged hydraulic diameter of the boundary element in borderline region, and Φ 2 represent at borderline region direct The averaged hydraulic diameter of the unit in the cell density region that inner side is formed.This makes to work as and cell density When region compares, in catalyst can be easily supported at boundary element (more specifically, on border On the surface in next door).It is thus possible to suppression generation unit in the boundary element of borderline region blocks.Make For as a result, it is possible to have fully and reduce the pressure loss of honeycomb molded body and strengthen waste gas purification The effect of energy.

Further, in aforesaid honeycomb molded body, because the unit with high cell density is close Degree region is disposed in the region (such as, in SPECTRAL REGION) that the waste gas of substantial amount flows through, it is possible to The catalyst being quickly increased in alveolate texture body by temperature at once after internal combustion engine start is activated Activationary temperature.This makes it possible to reduce discharge and improve exhaust-gas purifying performance further.Further, Such as, because the cell density region with low cell density is disposed in the outside of honeycomb molded body Region, it is possible to make waste gas close easily through the unit formed in the exterior lateral area of honeycomb molded body Degree region.This each cell density district making it possible to waste gas is uniformly supplied to honeycomb molded body Territory and further enhance exhaust-gas purifying performance.And, because this structure increases whole cellular knot The aperture efficiency (aperture area and the area of section ratio at axial cross section) of structure body, it is possible to reduce honeycomb The pressure loss of shape structure.

As previously mentioned, it is possible to provide a kind of and can reduce the pressure loss and strengthen exhaust-gas purifying performance Honeycomb molded body.

Accompanying drawing explanation

Fig. 1 is the axonometric chart that the honeycomb molded body according to the present invention is described, (a) illustrates have two The exemplary embodiment in cell density region and (b) illustrate the example with multiple cell density regions Property embodiment.

Fig. 2 is the radial cross-section that the honeycomb molded body according to embodiment E1 to E5 and E8 is described View.

Fig. 3 is the view of the radial cross-section that the honeycomb molded body according to embodiment E6 is described.

Fig. 4 is the view of the radial cross-section that the honeycomb molded body according to embodiment E7 is described.

Fig. 5 is cell pitch vertical that the unit in the alveolate texture body according to these embodiments is described Body figure, (a) illustrates that unit has the situation of square shape, and (b) illustrates that unit has hexagon The situation of shape.

Fig. 6 is the view of the radial cross-section that the honeycomb molded body according to comparative examples is described, (a) Comparative examples C1 is shown, and (b) illustrates comparative examples C2.

Fig. 7 is the view of the radial cross-section that the honeycomb molded body according to comparative examples is described, (a) Comparative examples C3 is shown, and (b) illustrates comparative examples C4.

Fig. 8 is the method illustrating the pressure loss evaluating the honeycomb molded body according to these embodiments View.

Fig. 9 is regarding of the catalytic converter of the honeycomb molded body being shown provided with these embodiments with good grounds Figure.

Figure 10 is that the microphotograph of the axial end illustrating the honeycomb molded body according to embodiment E regards Figure, (a) is shown in before catalyst supported, the end face of honeycomb molded body, and (b) is shown in After catalyst is supported, the end face of honeycomb molded body.

Figure 11 is that the microscope of the axial end illustrating the honeycomb molded body according to comparative examples C3 shines Sheet view, (a) is shown in before catalyst supported, the end face of honeycomb molded body, and (b) shows Go out after catalyst is supported, the end face of honeycomb molded body.

Figure 12 is to illustrate according to exemplary embodiment and the cell density of the honeycomb molded body of comparative examples Curve chart than the relation between Ma/Mb and discharge ratio.

Figure 13 is to illustrate according to exemplary embodiment and the borderline region of the honeycomb molded body of comparative examples Position r/R and cell density than the curve chart of the relation between Ma/Mb.

Figure 14 be the averaged hydraulic diameter illustrating the honeycomb molded body according to embodiment ratio Φ 1/ Φ 2 with The curve chart of the relation between the length of coating zone.

Detailed description of the invention

As it was previously stated, there is multiple cell density region according to the honeycomb molded body of the present invention, described Cell density region has the different list being altered in steps from central side to outer circumferential side in radial cross-section Unit's density.It is, honeycomb molded body is radially being divided into multiple district from central side to outer circumferential side Territory (it is, cell density region).Each cell density region has constant cell density.That This adjacent cell density region has different cell densities so that the unit in cell density region is close Spend and be radially altered in steps.

And, the boundary element in borderline region has polygonal shape, and it is different from frontier district The cell configuration in the cell density region that both sides, territory are formed.Such as, when the limit formed in borderline region Boundary's unit has the shape with Low rigidity of the shape being different from the unit formed in cell density region Time (such as, pentagon shaped), borderline region can have flexibility.It is, this makes it possible to Enough give a part of flexibility of honeycomb molded body and thus increase resistance to sudden heating.

Further, the relation between averaged hydraulic diameter of phi 1 and Φ 2 be Φ 1/ Φ 2 < when 1, it is possible to Catalyst (specifically, exists in can not being easily supported in borderline region the boundary element formed On the surface in next door, border).This causes being difficult to fully obtain suppression and produces in the boundary element of borderline region The effect of raw unit blocking.Therefore, the present invention meets about averaged hydraulic diameter of phi 1 and Φ 2 Φ1/Φ2≥1.25。

Further, averaged hydraulic diameter of phi 1 and Φ 2 disclosure satisfy that 1.25≤Φ 1/ Φ 2≤2.02.This closes System makes when with time compared with the unit in cell density region, the boundary element in borderline region can Easily support catalyst and acquisition fully suppression causes at the boundary element inner catalyst of borderline region Unit blocking effect.

When the relation of averaged hydraulic diameter of phi 1 with Φ 2 is Φ 1/ Φ 2 > 2.02, because borderline region and list Flow channel resistance difference between unit's density area becomes big, and this will cause these regions to have easy The different tendencies of support catalyst.This introduces the difficulty supporting catalyst in alveolate texture body equably. And, when the slurry containing noble metal is coated onto in alveolate texture body as catalyst, catalyst Unnecessary amount be consumed.This is undesirable for manufacturing cost.

Aforesaid averaged hydraulic diameter of phi 1 is the equivalent hydraulic diameter of the boundary element in borderline region Meansigma methods.And, aforesaid averaged hydraulic diameter of phi 2 is the list that directly inner side is formed at borderline region The meansigma methods of the equivalent hydraulic diameter of the unit in unit's density area.Equivalent hydraulic diameter Φ is by equation Φ=4a/b represents, wherein reference character a represents the list in the radial cross-section of honeycomb molded body The inner side area of unit's (boundary element), and reference character b represents the girth of honeycomb molded body.

And, honeycomb molded body can have the structure of the satisfied relation of 1 < Ma/Mb≤2.2, wherein Reference character Ma represents the cell density region formed except the outermost in multiple cell density regions Outside, the largest unit density in cell density region is (hereinafter by also referred to as high cell density district Territory), and reference character Mb represents the minimum in the cell density region in multiple cell density regions Cell density (hereinafter will be also referred to as low cell density region).This structure makes it possible to fully There is provided and reduce discharge and improve the effect of exhaust-gas purifying performance.Additionally, the value for Ma/Mb preferably exists To have higher exhaust-gas purifying performance in the range of 1.25 to 1.87.

When relation between cell density Ma and Mb is Ma/Mb≤1, major part waste gas is concentrated To the core of honeycomb molded body and within it flow.This causes being difficult to effectively utilize whole honeybee Nest shape structure and be difficult to provide and reduce discharge and improve the effect of exhaust-gas purifying performance.On the other hand, Relation between cell density Ma and Mb is Ma/Mb > 2.2 time because when high cell density district Territory is disposed in region (such as, central area) and the low cell density district that major part waste gas flows through When territory is disposed in the outside in high cell density region, exterior lateral area has extremely low cell density, waste gas Readily flow through the exterior lateral area of honeycomb molded body.This structure causes the waste gas will not be by through honeycomb Shape structure and be sufficiently purified, and therefore reduce exhaust-gas purifying performance.

Such as, high cell density region can have at 62 to 186 unit/cm²In the range of unit Density, and further low cell density region can have at 46.5 to 139.5 unit/cm²Model Enclose interior cell density.And, the next door in high cell density region can have in 30 to 120 μm In the range of thickness, and the next door in low cell density region can have in 50 to 200 μm In the range of thickness.

Further, honeycomb molded body can have the satisfied structure of 0.16 < r/R < 1, wherein reference Character R represents the radius of honeycomb molded body, and reference character r represents the radius of borderline region, Described borderline region is by except having in addition to the outermost cell density region in multiple cell density regions Have largest unit density cell density region and with the cell density region phase with largest unit density The cell density region that neighbour is outwardly formed separates.This structure makes it possible to offer and is substantially reduced discharge And strengthen the effect of exhaust purification performance.Further preferably make r/R value in the range of 0.5 to 0.8 To have higher exhaust-gas purifying performance.When honeycomb molded body or borderline region have the shape of circle During shape, radius R, r are its radiuses.On the other hand, have when honeycomb molded body or borderline region During polygonal shape, radius R, r are the radiuses of its inscribed circle.

Additionally, honeycomb molded body can have a structure in which, in the structure shown here, except being arranged in Outside the outermost cell density region in multiple cell density regions, there is the list of largest unit density Unit's density area is disposed in inner side.Because this structure allows the high unit with big surface area Density area is arranged at the region of major part waste gas process (such as, at central side), it is possible to has and fills Divide and reduce discharge and improve the effect of exhaust-gas purifying performance.In this structure, high cell density district The central axis in territory need not be consistent with the central axis of honeycomb molded body.For instance, it is possible to based on honeycomb The shape of the exhaust piping that shape structure is mounted thereto and the flowing etc. of waste gas, by high cell density district Territory is positioned at optimal side.

Additionally, honeycomb molded body can have a structure in which, in the structure shown here, the plurality of district Territory is made up of two cell density regions, it is, inside cell density area and outer cells density Region.In inside cell density area and outer cells density area each by be arranged to square lattice Next door and the square shaped cells surrounded by next door of sub-shape form.The inside cell formed in inner side is close The cell density in degree region is 2 with the ratio of the cell density of the outer cells density area formed in outside: 1.Unit at the outer cells density area of exterior lateral area formation has relative in inside region formation The unit of inside cell density area become the inclination (seeing Fig. 3 and Fig. 4 described below) of 45 degree. This structure makes it possible to improve the intensity (such as isostatic pressed intensity etc.) of honeycomb molded body.Additionally, In the next door, border in borderline region is connected to the cell density region of both sides formation of borderline region During grid point (abutment) in next door, it is possible to (the most just improve the intensity of honeycomb molded body further It is, isostatic pressed intensity etc.) (seeing Fig. 3 and Fig. 4 that will be described later).

Honeycomb molded body can have by two cell density regions (it is, high cell density district Territory and low cell density region) structure that forms, in the structure shown here, high cell density region is arranged At inner side (it is, at central side), and low cell density region is disposed in outside (namely Outer circumferential side).This structure makes it possible to have fully and reduces discharge and improve the effect of exhaust-gas purifying performance The more uniform waste gas of fruit and formation flows and improves the effect of exhaust-gas purifying performance.

Honeycomb molded body can have by the structure formed no less than three cell density regions, at this In structure, cell density region is arranged to radially from central side to outside (it is, to periphery Side) progressively reduce cell density.This structure makes it possible to more improve supplies waste gas equably and carries The effect of high exhaust-gas purifying performance.But, this structure may be by the list in outermost cell density region Unit's density is reduced to too low, and as a result, it is possible to reduce the intensity of honeycomb molded body (also It is exactly, isostatic pressed intensity).In order to avoid this situation, preferably increase outermost cell density region Cell density is to guarantee the bulk strength of honeycomb molded body.

Aforesaid honeycomb molded body is used for can be by using the catalyzed conversion of catalyst cleaning waste gas Device etc..In this case, on the surface in the next door that catalyst is supported on honeycomb molded body.Honeybee Nest shape structure can have the porosity in the range of such as 10% to 70%.Each cell density region Preferably there is identical porosity.

Described unit can have in radial cross-section circular and polygon etc. (such as, square and Hexagon) shape.Additionally, cell density region can have circle, polygon in radial cross-section The external shape such as shape.

Borderline region can have circular and polygon (such as square, six limits in radial cross-section Shape etc.) external shape.Additionally, boundary element can to have polygon in radial cross-section (all As, square, pentagon etc.) shape.

Next door, border can have the thickness in 30 to 160 μ m.And, when the lattice in next door When sub-point (abutment) is joined together, it is possible to increase the intensity of honeycomb molded body (it is, Isostatic pressed intensity etc.), in the cell density region that wherein said next door is formed in the both sides of borderline region It is arranged to clathrate.

In the exemplary embodiment, multiple honeycomb molded bodies (embodiment E1 to E8) and multiple honeybee Nest shape structure (comparative examples C1 to C4) is generated, and the pressure of described honeycomb molded body Loss, exhaust-gas purifying performance, resistance to sudden heating etc. are evaluated.

Honeycomb molded body (embodiment E1 to E8) according to exemplary embodiment will be given with reference to the accompanying drawings Description.As shown in Figures 1 to 4, honeycomb molded body 1 is by being arranged to cancellate next door 11 He Surrounded the multiple unit 12 formed to form to form integrally formed body by next door 11.Additionally, it is cellular Structure 1 is made up of multiple cell density regions 2 (21,22), and the plurality of cell density region exists In being perpendicular to the cross section of axial X, there is from central side to outer circumferential side different cell densities.Frontier district Territory 14 is formed between cell density region 2 adjacent one another are.Fig. 1 (a) and Fig. 2 to Fig. 4 The honeycomb molded body 1 with two cell density regions 2 (21,22), two cell densities are shown Region 2 (21,22) has different cell densities.But, have as shown in Fig. 1 (b) many The honeycomb molded body of individual cell density region 2 (no less than three, 21,22 ... and 2n) is can Accept.

As shown in these figures, borderline region 14 is by next door, border 141 and multiple boundary element 142 groups Become.It is arranged in the next door 11 in the cell density region 2 (21,22) at the both sides of borderline region 14 It is connected to each other by next door, border 141.Boundary element 142 has polygonal shape, and it is different from shape Become the shape of unit 12 in the cell density region 2 being arranged in borderline region 14 both sides.Border is single A part for unit 142 is surrounded by next door, border 141.And, honeycomb molded body 1 meets The relation of Φ 1/ Φ 2 >=1.25, wherein, Φ 1 represents the boundary element 142 formed in borderline region 14 Averaged hydraulic diameter, and Φ 2 represent be arranged in borderline region 14 immediately inner side cell density The averaged hydraulic diameter of the unit 12 formed in region 2.Explained below will be explained in described relation.

As it is shown in figure 1, honeycomb molded body 1 (corresponding to embodiment E1 to E8) be used as can be clean Change the catalyst support elements of waste gas.Honeycomb molded body 1 is by next door 11, multiple unit 12 and periphery Wall 13 forms.Next door 11 is arranged to square lattice shape.Unit 12 is surrounded by next door 11. The outer surface of honeycomb molded body 1 is covered by periphery wall 13.Honeycomb molded body 1 is by cordierite shape Become and the formed body that forms as one.Honeycomb molded body 1 has diameter and the 105mm of 103mm Length.

Such as Fig. 2 (illustrating embodiment E1 to E5 and embodiment E8), Fig. 3 (illustrating embodiment E6) With Fig. 4 (illustrating embodiment E7) Suo Shi, in the structure of honeycomb molded body 1, alveolate texture The cross section (it is, radial cross-section) being perpendicular to axial X (seeing Fig. 1) of body 1 is by therefrom Heart side is divided into two cell density regions 2 (it is, first module density area 21 He to outer circumferential side Second unit density area 22).In cell density region 2 each respectively to have constant unit close Degree.Cell density region 2 adjacent one another are has and is radially oriented the different cell density being altered in steps. Fig. 2, Fig. 3 and Fig. 4 illustrate 1/4th of the radial cross-section of honeycomb molded body 1.

As shown in these figures, first module density area 21 is disposed in inner side, it is, cloth Put the central side at honeycomb molded body 1.In addition to the cell density region 2 formed in outermost, First module density area 21 is that the cell density region 2 with largest unit density is (it is, high Cell density region 2a).Additionally, the next door 11 in first module density area 21 has 0.09mm The thickness of (90 μm).Second unit density area 22 is disposed in the periphery of honeycomb molded body 1 Outermost at.Second unit density area 22 is the cell density region 2 with minimum unit density (it is, low cell density region 2b).Next door 11 in second unit density area 22 has The thickness of 0.09mm (90 μm).

Honeycomb molded body 1 shown in Fig. 2 to Fig. 4 has a structure in which, in the structure shown here, the One cell density region 21 and second unit density area 22 tilt (single second in different directions Unit 22 in unit's density area 22 inclines relative to the unit 12 in first module density area 21 Oblique 45 degree).For instance, it is possible to have a structure in which, in the structure shown here, at second unit density region Unit in territory 22 and the unit in first module density area 21 12 tilt in same direction.

Further, as shown in Figures 2 to 4, honeycomb molded body 1 meets 1 < Ma/Mb≤2.2 Relation, wherein, reference character Ma represents high cell density region 2a (namely first module density Region 21) cell density, and reference character Mb represent low cell density region 2b (it is, Second unit density area 22) minimum unit density.Table 1 illustrates that each honeycomb molded body 1 is (real Execute example E1 to E8) cell density region 2 (it is, first module density area 21, second Cell density region 22) cell density (individual unit/cm²) and cell density compare Ma/Mb.

To provide the description of the method for each cell density obtained in cell density region 2 now. Cell pitch P that Fig. 5 (a) and Fig. 5 (b) illustrates is by using tool microscope, another microscope Deng measuring so that the cell density obtained in the radial cross-section of honeycomb molded body 1.Cell density (cpsi) can be calculated by cell pitch P using equation below and measurement.Exemplary embodiment Use microscope (VHX-900 manufactured by KEYENCE company) and measuring unit density area Each five point in 2 and the meansigma methods of cell pitch P of computation and measurement.The ginseng of cell density Examine character " cpsi " and represent element number per square inch.Table 1 uses to be changed by unit " cpsi " Unit (individual unit/cm²)。

Such as, as shown in Fig. 5 (a), when unit 12 has the structure such as embodiment E1 to E8 When square shape and averaging unit pitch are p1, cell density (cpsi) is such as the following by using Formula calculates: cell density (cpsi)=(25.4/p1)².Additionally, as shown in Fig. 5 (b), when unit 12 Having a hexagonal shape and time averaging unit pitch is p2, cell density (cpsi) is by relevant equations Calculate: cell density (cpsi)=(2/ √ 3) × (25.4/p2)²。

Additionally, as shown in Figures 2 to 4, borderline region 14 is formed on cell density adjacent one another are So that two cell density regions 2 are separated between region 2 (21,22).Borderline region 41 has There is octagonal shape (seeing Fig. 1).Borderline region 14 is by next door, border 141 and boundary element 142 Composition.Next door, border 141 connection (is the most just arranged in the cell density region 2 of borderline region 14 both sides Be, first module density area 21 and second unit density area 22) in next door 11.Border is single Unit 142 is by next door, border 141 and (is the most just arranged in the cell density region 2 of borderline region 14 both sides Be, first module density area 21 and second unit density area 22) in next door 11 surround.This Outward, boundary element 142 has the cell density region 2 being different from the formation of the both sides of borderline region 14 Unit 12 in (it is, first module density area 21 and second unit density area 22) Shape.

As in figure 2 it is shown, the limit having according to the honeycomb molded body 1 of embodiment E1 to E5 and E8 Boundary's unit 142 has square and pentagon shaped (is different from cell density region 2 in shape The square shape of unit 12).As shown in Figure 3 and Figure 4, according to embodiment E6 and the honeybee of E7 The boundary element 142 that nest shape structure 1 has has pentagon shaped.And, according to embodiment In the honeycomb molded body 1 of E6 and E7, it is arranged in the cell density region 2 of inner side (it is, the One cell density region 21) and it is arranged in the cell density region 2 in outside (it is, second unit Density area 22) between cell density than for 2:1.Further, next door, border 141 is formed So that next door, border 141 is connected to be arranged in the cell density region 2 of the both sides of borderline region 14 (also Be exactly, first module density area 21 and second unit density area 22) in be arranged to cancellate every The grid point (abutment) of wall 11.This structure improves the intensity of honeycomb molded body 1 (namely Isostatic pressed intensity etc.).

As shown in Figures 2 to 4, meet according to the honeycomb molded body 1 of embodiment E1 to E8 The relation of Φ 1/ Φ 2 >=1.25, wherein Φ 1 represents the average of the boundary element 142 in borderline region 14 Hydraulic diameter, and Φ 2 represents the cell density region 2 that directly inner side is formed at borderline region 14 The averaged hydraulic diameter of interior unit 12.Table 1 is shown in honeycomb molded body 1 (corresponding to embodiment E1 to E8) in the cell density region 2 that formed (single as first module density area 21 and second Unit's density area 22) in each in the averaged hydraulic diameter (mm) of unit and averaged hydraulic Ratio Φ 1/ Φ 2 of diameter.

Further, as shown in drawings, honeycomb molded body 1 meets the relation of 0.16 < r/R < 1, its Middle reference character R represents the radius of honeycomb molded body 1, and reference character r represents high unit Density area 2a (it is, first module density area 21) is from adjacent with cell density region 2a The border that the cell density region 2 (it is, second unit density area 22) being outwardly formed separates The radius in region 14.Because in the honeycomb molded body 1 according to embodiment E1 to E7, frontier district Territory 14 has octagonal shape (seeing Fig. 1), and the inscribed circle of borderline region 14 has radius r. In an embodiment, borderline region be formed so that inscribed circle 0 ° of honeycomb molded body 1,90 °, 180 ° of inner sides contacting the next door 11 forming boundary element 142 with 270 ° of positions.Table 1 illustrates The position r/R of each borderline region in honeycomb molded body 1 according to embodiment E1 to E8.

Provide retouching of honeycomb molded body 9 (according to comparative examples C1 to C4) below with reference to the accompanying drawings State.

As shown in Fig. 6 (a) and Fig. 6 (b), according to comparative examples C1 and the alveolate texture of C2 Body 9 is only by a cell density region (it is, the first module density area being shown in Table 1) Composition, this is different from the structure of the aforesaid honeycomb molded body 1 according to embodiment E1 to E8.Also It is exactly that whole honeycomb molded body 9 has constant cell density.Honeycomb according to comparative examples C1 Shape structure 9 (seeing Fig. 6 (a)) has less than the honeycomb molded body 9 according to comparative examples C2 The cell density of (seeing Fig. 6 (b)).The miscellaneous part of honeycomb molded body 9 has and aforesaid According to the structure that the parts of the honeycomb molded body 1 of embodiment E1 to E8 are identical.Table 1 is shown in honeycomb The averaged hydraulic in the cell density region 2 in shape structure 9 (example C1 and C2 as a comparison) is straight Footpath (mm), cell density (individual unit/cm²) etc..

As shown in Fig. 7 (a), it is similar to the cellular knot foregoing according to embodiment E1 to E8 The structure of structure body 1, the honeycomb molded body 9 of example C3 is by two cell density regions 2 as a comparison (it is, first module density area 21 and second unit density area 22) forms.There is tubular The next door (or inner peripheral wall) 19 of shape be formed at honeycomb molded body 9 cell density region 2 it Between.The miscellaneous part of honeycomb molded body 9 has and the honeycomb of foregoing embodiment E1 to E8 The structure that the parts of shape structure 1 are identical.

Table 1 is shown in each cell density district in honeycomb molded body 9 (example C3 as a comparison) The averaged hydraulic diameter in territory 2 (as first module density area 21 and second unit density area 22) (mm), cell density (individual unit/cm²) etc..As shown in table 1, comparative examples C3 is cellular The averaged hydraulic diameter of the borderline region in structure 9 represent by next door, border 19 and be arranged in border every The next door 11 in cell density region 2 (as first module density portion 21) inside wall 19 is wrapped Enclose the averaged hydraulic diameter of the defective unit 12 of formation.The position r/R of borderline region represents next door, border The position of 19.

As shown in Fig. 7 (b), it is similar to the honeycomb molded body according to aforesaid embodiment E1 to E8 The structure of 1, the honeycomb molded body 9 of example C4 is by two cell density regions 2 (also as a comparison It is exactly, first module density area 21 and second unit density area 22) composition.But, as right Honeycomb molded body 9 than example C4 does not have next door (i.e., not between two cell density regions There is any internal perisporium).The miscellaneous part of honeycomb molded body 9 has and foregoing embodiment The structure that the parts of the honeycomb molded body 1 of E1 to E8 are identical.

Table 1 illustrates each cell density region in honeycomb molded body 9 (example C4 as a comparison) The averaged hydraulic of 2 (it is, first module density area 21 and second unit density areas 22) is straight Footpath (mm), cell density (individual unit/cm²) etc..As shown in Fig. 7 (b), example as a comparison Borderline region in the honeycomb molded body 9 of C4 is marked by a dotted line, and described dotted line represents that first is single Borderline region between unit's density area 21 and second unit density area 22.

Below, will be given as embodiment E1 to E8 and the alveolate texture of comparative examples C1 to C4 The description of the production method of body 9.First, Ceramic Material is prepared.Ceramic Material substantially by Kaolin, Fused silica, aluminium hydroxide, aluminium oxide, Talcum, carbon particle etc. form to meet cordierite Chemical composition is SiO₂: 45% to 55%, Al₂O₃: 33% to 42% and MgO:12% to 18%. The water of scheduled volume, binding agent and other materials are added in Ceramic Material and are then mixed to Together to form Ceramic Material.

Then, the Ceramic Material obtained is used extrusion molding mould extrusion molding to be had by use The extrusion molding mould of multiple slit grooves produces alveolate texture formed body.The pattern of slit groove corresponds to The layout in next door or shape.Alveolate texture formed body is dried by using microwave.The honeybee being dried Nest shape structure formation body is cut to have predetermined length, and then by predetermined maximum temperature Fire to produce honeycomb molded body under (such as, 1390 DEG C to 1430 DEG C).

Below, honeycomb molded body will be provided (it is, embodiment E1 to E8 and contrast are shown now Each in example C1 to C4) the pressure loss, exhaust-gas purifying performance, the evaluation of resistance to sudden heating etc.. Hereinafter, by the evaluation methodology of the explanation pressure loss, exhaust-gas purifying performance, thermal shock resistance etc..

In the evaluation of the pressure loss, as shown in Figure 8, the honeycomb molded body 1 of catalyst has been supported (9) pressure loss evaluating apparatus 7 it is installed to.Then, aerator is by pressure loss evaluating apparatus 7 Interior air A1 is sucked into outside.After pressure loss evaluating apparatus 7 has had low pressure, predetermined The air A2 of amount is supplied to honeycomb molded body 9 so that the quantitative change of the air A2 supplied is 6m³/ Minute.Pressure transducer 71 in pressure loss evaluating apparatus 7 detects pressure loss evaluating apparatus 7 Inside pressure.Pressure reduction between pressure and the atmospheric pressure of detection is calculated to obtain honeycomb molded body The pressure loss.In the exemplary embodiment, relative to the Calculation of pressure loss pressure of comparative examples C2 Loss ratio.

In the evaluation of exhaust-gas purifying performance, preparing honeycomb molded body, described honeycomb molded body exists Deterioration aspect is equal to the feelings after the vehicle with honeycomb molded body has run 100,000 kilometers Condition.Then, as it is shown in figure 9, honeycomb molded body 1 (9) is installed to another internal combustion engine.Now, Volume has the honeycomb molded body 1 (9) of aluminium oxide pad 81 to be installed to the inner side of exhaust piping 82 with shape Become catalytic converter 8.As omitted from accompanying drawing, fully deteriorated by use heating by electric cooker The UF/C position of the internal combustion engine being installed to vehicle with the honeycomb molded body of catalyst (is urged under base plate Agent).At vehicle after preassigned pattern (LA#4 evaluation model) is run, arrange from internal combustion engine The amount of the every kind of emission (HC, CO and NOx) put is detected.In the exemplary embodiment, base In the discharge capacity of comparative examples C2 as reference value, obtain the discharge of each embodiment and comparative examples Ratio.

In the exemplary embodiment, S/C positional representation is at the exhaust steam passage that is installed to of immediately internal combustion engine Position after discharge port, wherein flows through described exhaust steam passage from the waste gas of engine exhaust.And, UF/C positional representation is in the vehicle floor location directly below in downstream, S/C position.Can use by γ Aluminium oxide and/or cerium and as in platinum (Pd), rhodium (Rh) and the palladium (Pd) of noble metal at least A kind of catalyst in the alveolate texture body to be supported on of composition, it is, three-way catalyst.

And, when catalyst is supported in the alveolate texture body of embodiment E1 to E5, pass through Detection in the boundary element of borderline region whether generation unit blocking and perform being produced by catalyst The evaluation of unit blocking.And, in catalyst is supported on the alveolate texture body of comparative examples C3 Time, by detection by next door, border and formed inside borderline region cell density region (as First module density area) next door formed defective unit open area end face in whether produce Unit blocks and performs the evaluation to the unit blocking produced by catalyst.Block up when being not detected by unit During plug, evaluation result is expressed as reference character " A ", and when detecting that unit blocks, evaluates knot Fruit is expressed as reference character " B ".

The evaluation of isostatic pressed intensity is based on the Japanese Automobile Standards promulgated by Japanese car IEEE " test of isostatic pressed breakdown strength " that JASO standard 505-87 determines performs.In concrete example, Honeycomb molded body is disposed in the cylindrical container formed by rubber.Cylindrical container is with being formed by aluminum Plate seals.Cylindrical container performs in water isostatic pressed compression, and honeycomb molded body is stored in described In cylindrical container.Load when honeycomb molded body destroys is detected, and honeycomb molded body Isostatic pressed intensity calculates based on the load detected.It is quiet that exemplary embodiment is based on comparative examples C3 etc. Crush the isostatic pressed breakdown strength ratio of bad Strength co-mputation embodiment E1 and E6.

And, when honeycomb molded body is arranged such that axially to become and honeybee identical with vertical direction When one open end of nest shape structure is coated with catalyst, the evaluation of catalyst coat is performed. Now, the edge of the unit formed in cell density region (it is, first module density area) Axial half length is coated with catalyst, and described cell density region is on the limit of honeycomb molded body The directly inner side of boundary region is formed.The half length of unit based on aforementioned definition, calculates in each reality The length being coated with catalyst of the boundary element formed in executing the borderline region in example and alveolate texture The ratio of the half length of body.Based on evaluation result, reference character " A " represents the length being coated with catalyst Spend the ratio with the half length of honeycomb molded body and be not more than 2.Reference character " B " represents to be coated with urges The length of agent is more than 2 with the ratio of the half length of honeycomb molded body.It is coated with the length of catalyst Evaluate and only the honeycomb molded body of embodiment E6 and E7 is performed.

It is coated with the length of catalyst by using below equation to calculate:

((weight used by catalyst coat) × (density of catalyst coat))/((cellular knot The GSA of the per unit volume of structure body)).

When honeycomb molded body is made up of the unit with square shape, its GSA can based on every The thickness t of wall and cell pitch p (seeing Fig. 5 (a)) calculate.Distance x (=p-t) (sees Fig. 5 (a)) be in each cell faced by next door limit between distance, described distance is based on next door Average thickness t and cell pitch p calculate.Distance x is the length of each edge of unit.Because working as honeybee When the unit of nest shape structure has square shape, unit longitudinally has flat shape, when cellular When the length of structure is L, it is possible to calculate the surface area S (=4yL) of each unit.Alveolate texture The GSA of body can quantity based on unit and calculate.Can also cumulative volume based on honeycomb molded body Calculate the GSA of per unit volume.

Such as, it is similar to afore-mentioned, it is possible to thickness t based on next door and cell pitch p (see figure 5 (b)) calculate have hexagonal shape unit honeycomb molded body per unit volume GSA (also It is exactly geometrical surface).Distance x (=p-t) between limit facing with each other in each unit (sees Fig. 5 (b)) thickness t based on next door and cell pitch p calculate.Length y (=x/ √ 3) on every limit By using distance x calculated to calculate.Because each unit in alveolate texture body has Along the simple tabular of its longitudinal direction, when character L represents the length of honeycomb molded body, it is possible to calculate The surface area S (=6yL) of each unit.Quantity based on unit can calculate the total of honeycomb molded body GSA.It can also enough volumes based on whole honeycomb molded body calculate the GSA of per unit volume.

The evaluation of resistance to sudden heating heats cellular knot by using electric furnace at predetermined temperature (1050 DEG C) Structure body performs.Then, the honeycomb molded body of heating is taken out from electric furnace, and the air stream of room temperature Enter the central area of honeycomb molded body, now, it is possible to by regulation air pressure by alveolate texture The temperature difference (Δ T) between the inner side and outer side of body be adjusted to desired temperature difference T (Δ T=50 DEG C, 60 DEG C and 70 DEG C).The temperature difference between inner side and outer side is mounted to the radial cross-section of honeycomb molded body The thermocouple of central area and be installed between the thermocouple of central area radially outward 10mm Temperature difference.

When the generation ratio Z of crackle is 0% (namely Z=0%), use ten alveolate textures The judged result about resistance to sudden heating of body is expressed as reference character " A ".Generation ratio when crackle It is 0% < during Z≤50%, it is judged that result is expressed as reference character " B ".When producing ratio it is 50% < during Z≤100%, it is judged that result is expressed as reference character " C ".Exemplary embodiment has been evaluated Embodiment E8 and the resistance to sudden heating of comparative examples C4.

Table 1

And, table 1 illustrates the evaluation result of the pressure loss, exhaust-gas purifying performance, resistance to sudden heating etc.. If understand from table 1, because there is borderline region and meeting Φ 1/ Φ 2 >=1.25, according to enforcement The honeycomb molded body of example E1 to E5 has the pressure loss ratio less than 1 and the discharge ratio less than 1. It is, when compared with comparative examples C2, according to the alveolate texture of embodiment E1 to E5 Body has the pressure loss of reduction and the exhaust-gas purifying performance of enhancing.As result, according to embodiment E1 Honeycomb molded body to E5 can reduce the pressure loss and have preferable exhaust-gas purifying performance.

And, if understand from table 1, close according to the honeycomb molded body of embodiment E1 to E5 The unit blocking caused in catalyst has evaluation result " A ".On the other hand, according to comparative examples C3 The unit blocking that causes about catalyst owing to having a defective unit of honeycomb molded body there is evaluation Result " B ".Figure 10 illustrates the district around borderline region of the honeycomb molded body according to embodiment E1 The microphotograph in territory.Figure 10 (a) is shown in catalyst and is supported on the honeycomb according to embodiment E1 State before in shape structure.Figure 10 (b) is shown in catalyst and is supported on according to embodiment E1 Honeycomb molded body after state.If understand from these accompanying drawings, according to embodiment E1 Honeycomb molded body in catalyst is supported on alveolate texture body after in the district around borderline region The unit blocking that catalyst causes is not had in territory.Figure 11 illustrates the cellular knot according to comparative examples C3 The microphotograph in the region around borderline region of structure body.Figure 11 (a) is shown in catalyst and is supported State before in the alveolate texture body according to comparative examples C3.Figure 11 (b) is shown in catalysis Agent be supported in the alveolate texture body according to comparative examples C3 after state.If from these Accompanying drawing understands, is supported on cellular knot according to the honeycomb molded body of comparative examples C3 at catalyst Unit is caused to block (by Figure 11 (b) after in structure body in the defective unit formed around borderline region Reference character P mark).

And, if understand from table 1, have according to the honeycomb molded body of embodiment E6 and be higher than Each isostatic pressed intensity in comparative examples C3 and embodiment E1.This feature of embodiment E6 Being obtained by such structure, in the structure shown here, cell density is than for 2:1, and this ratio is on limit The list of the inside cell density area (it is, first module density area) formed inside boundary region Unit's density and the outer cells density area formed outside borderline region are (it is, second unit is close Degree region) cell density between ratio, and the unit phase being arranged in outer cells density area Unit for being arranged in inside cell density area tilts 45 ° so that by the both sides at borderline region The grid point in the next door arranged in the inside cell density area formed and outer cells density area (connects Chalaza) connect.

Additionally, Figure 12 evaluation result based on table 1 illustrates that cell density than Ma/Mb and discharges than it Between relation.Each discharge ratio in embodiment E1 to E3 and comparative examples C2 and C3 is by figure Draw in 12.Especially, comparative examples C2 has the cell density ratio of Ma/Mb=1.If from Figure 12 understands, (especially, has when honeycomb molded body has the relation of 1 < Ma/Mb≤2.2 The value of the Ma/Mb in the range of 1.25 to 1.87) time, it is possible to (the most just reduce discharge ratio further It is to reduce discharge capacity further) and strengthen exhaust-gas purifying performance.

And, Figure 13 illustrates position r/R and the discharge of borderline region based on the evaluation result shown in table 1 Relation between Bi.Each row in embodiment E1, E4 and E5 and comparative examples C1 and C2 Put ratio to be drawn in fig. 13.Because the first module density area in comparative examples C1 is at unit Each first module density area that density aspect is different from embodiment E1, E4 and E5, so The position r/R of the borderline region in comparative examples C1 is zero (r/R=0), as shown in figure 13.(special Not, the position r/R of the borderline region in comparative examples C1 is used reference character "-" in Table 1 Mark).Additionally, because first module density area in comparative examples C2 have with embodiment E1, The cell density that each first module density area in E4 with E5 is identical, so in comparative examples It is 1 that the position r/R of the borderline region in C2 is marked in fig. 13, namely r/R=1.(in contrast The position r/R of the borderline region in example C2 is marked by reference character "-" in Table 1).If Enough understand from Figure 13, because the relation with 0.16 < r/R < 1 (especially, has 0.5 to 0.9 In the range of r/R value), as embodiment E1, E4 and E5 honeycomb molded body by discharge than reduce For the least (reducing discharge capacity further) and improve exhaust-gas purifying performance.

Based on the evaluation result in table 1, Figure 14 illustrates that hydraulic diameter is than between Φ 1/ Φ 2 and coated length Relation.Each catalyst coated length in embodiment E6 and E7 is drawn in fig. 14.If Enough from Figure 14 understanding, when meeting the relation of Φ 1/ Φ 2≤2.02, catalyst coated length is reduced to It is not more than 2.It is, coat, when cellular knot to perform the catalyst of whole honeycomb molded body Structure body in axial half by catalyst from the coating of honeycomb molded body open end time, honeybee Nest shape structure is arranged to Top-Bottom and is inverted, and the residue half quilt of then honeycomb molded body Coat with catalyst.In this case, when whole honeycomb molded body is coated by catalyst, energy Enough prevent the catalyst Rather, openings region in alveolate texture body from flowing out and consuming urging of unnecessary amount Agent.

Further, if understand from table 1, make according to the honeycomb molded body of embodiment E8 Boundary element in borderline region has Low rigidity shape (having pentagon shaped), described boundary element At the unit (there is square shape) that vpg connection is different from cell density region.Therefore, exist Under conditions of Δ T=50 DEG C, Δ T=60 DEG C, Δ T=70 DEG C, according to the honeycomb molded body of embodiment E8 About resistance to sudden heating, there is evaluation result " A ".It is, can be by increasing the soft of borderline region Soft (it is, flexibility is endowed the regional area of honeycomb molded body) improves cellular knot The resistance to sudden heating of structure body.On the other hand, because according in the honeycomb molded body of comparative examples C4, The boundary element formed in borderline region and the unit formed in cell density region have identical Structure, it is impossible to enough there is the effect identical with the honeycomb molded body according to embodiment E8.According to contrast The honeycomb molded body of example C4 has evaluation knot about resistance to sudden heating under conditions of Δ T=60 DEG C Really " B " and there is under conditions of Δ T=70 DEG C evaluation result " C ".

[reference numerals list]

1 honeycomb molded body,

11 next doors

Unit 12

14 borderline regions

141 next door, borders

142 boundary elements

2 cell density regions

X is axial

Claims (7)

1. the honeycomb molded body (1) of the formed body that forms as one, described honeycomb molded body (1) Including being arranged to cancellate next door (11) and the multiple unit (12) surrounded by described next door (11), Wherein

Described honeycomb molded body (1) be included in radially formed from central side to outer circumferential side there is difference Multiple cell density regions (2) of cell density,

Borderline region (14) is formed between the cell density region (2) of next-door neighbour,

Described borderline region (14) includes next door, border (141) and has multiple limits of polygonal shape Boundary's unit (142),

Next door, described border (141) connects the cell density with described borderline region (14) adjacent formation Next door (11) in region (2),

The boundary element (142) with polygonal shape is different from unit (12) in shape,

At least some of of described boundary element (142) is surrounded by next door, described border (141), and

Described honeycomb molded body (1) meets the relation of Φ 1/ Φ 2 >=1.25,

Wherein Φ 1 represents putting down of the described boundary element (142) formed in described borderline region (14) All hydraulic diameter, and Φ 2 represent that the unit that directly inner side is formed at described borderline region (14) is close The averaged hydraulic diameter of the unit (12) formed in degree region (2),

Wherein except outermost cell density region (2) in the plurality of cell density region (2) In addition, the cell density region (2) with largest unit density is disposed in inner side.

Honeycomb molded body the most according to claim 1 (1), wherein said honeycomb molded body (1) relation of 1.25≤Φ 1/ Φ 2≤2.02 is met.

Honeycomb molded body the most according to claim 1 and 2 (1), wherein said cellular knot Structure body (1) meets the relation of 1 < Ma/Mb≤2.2,

Wherein reference character Ma represents except the outermost shape the plurality of cell density region (2) The largest unit density in cell density region (2) beyond the cell density region (2) become, and join Examine character Mb and represent cell density region (2) in the plurality of cell density region (2) Minimum unit density.

Honeycomb molded body the most according to claim 1 (1), wherein said honeycomb molded body (1) relation of 0.16 < r/R < 1 is met,

Wherein reference character R represents the radius of honeycomb molded body (1), and reference character r represents To have in addition to the outermost cell density region (2) in the plurality of cell density region (2) Have the cell density region (2) of largest unit density from the cell density district with largest unit density The radius of the borderline region (14) that the adjacent cell density region (2) being outwardly formed, territory (2) separates.

Honeycomb molded body the most according to claim 1 (1), wherein said multiple cell densities Region (2) is made up of, wherein inside cell density area (2) and outer cells density area (2) Each in described inside cell density area (2) and described outer cells density area (2) includes The next door (11) being arranged to square lattice shape and the square shaped cells surrounded by described next door (11) (12),

Inner side formed described inside cell density area (2) cell density with outside formed The ratio of the cell density of described outer cells density area (2) is 2:1, and

The unit of the described outer cells density area (2) formed in outside has relative at medial area The unit of the described inside cell density area (2) that territory is formed becomes the inclination of 45 degree.

Honeycomb molded body the most according to claim 3 (1), wherein said honeycomb molded body (1) relation of 1.25 < Ma/Mb≤1.87 is met,

Wherein reference character Ma represent except in the plurality of cell density region (2) in outermost lateral areas The largest unit density in cell density region (2) beyond the cell density region (2) that territory is formed, and And reference character Mb represents the cell density region (2) in the plurality of cell density region (2) Minimum unit density.

Honeycomb molded body the most according to claim 4 (1), wherein said honeycomb molded body (1) relation of 0.5 < r/R < 0.8 is met,

Wherein reference character R represents the radius of honeycomb molded body (1), and reference character r represents To have in addition to the outermost cell density region (2) in the plurality of cell density region (2) Have the cell density region (2) of largest unit density from the cell density district with largest unit density The radius of the borderline region (14) that the adjacent cell density region (2) being outwardly formed, territory (2) separates.