WO2013128957A1 - 導電性ペースト、及び電子部品、並びに電子部品の製造方法 - Google Patents
導電性ペースト、及び電子部品、並びに電子部品の製造方法 Download PDFInfo
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- WO2013128957A1 WO2013128957A1 PCT/JP2013/050449 JP2013050449W WO2013128957A1 WO 2013128957 A1 WO2013128957 A1 WO 2013128957A1 JP 2013050449 W JP2013050449 W JP 2013050449W WO 2013128957 A1 WO2013128957 A1 WO 2013128957A1
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- component
- external electrode
- glass phase
- conductive paste
- glass
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
- H01G4/0085—Fried electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/129—Ceramic dielectrics containing a glassy phase, e.g. glass ceramic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
- H01G4/2325—Terminals electrically connecting two or more layers of a stacked or rolled capacitor characterised by the material of the terminals
Definitions
- the present invention relates to a conductive paste, an electronic component, and a method for manufacturing the electronic component. More specifically, the present invention relates to a conductive paste suitable for forming an external electrode, a multilayer ceramic capacitor formed using the conductive paste, and the like. The present invention relates to an electronic component and a manufacturing method thereof.
- This type of electronic component for example, a multilayer ceramic capacitor, is usually applied with a conductive paste for external electrodes on both ends of a component body in which internal electrodes are embedded, and then fired to form external electrodes.
- a plating film such as Ni, Sn, or solder is formed on the surface of the external electrode, and the external electrode is covered with the plating film.
- Patent Document 1 discloses that a component element body includes a CaZrO 3 -based compound as a main component, and an external electrode includes a metal powder and a glass frit whose main component is Cu, Ni, or a Cu—Ni alloy.
- the glass frit contains 8 to 36 mol% of B 2 O 3 , 31 to 62 mol% of SiO 2 , and at least one of an alkali metal oxide and an alkaline earth metal oxide in total
- a multilayer ceramic capacitor containing 9 to 43 mol% and 0 to 3 mol% of ZnO has been proposed.
- Patent Document 1 describes that the penetration distance of the glass phase into the component body is controlled to 1 to 8 ⁇ m.
- the glass phase can be appropriately permeated into the component body by containing the zinc borosilicate glass having the above-described molar composition in the external electrode. This improves the bonding strength and plating property between the external electrode and the component body, and further suppresses the occurrence of structural defects in the internal electrode.
- Patent Document 1 since the glass phase is infiltrated into the component body at a depth of 1 to 8 ⁇ m, if the thickness of the external electrode is reduced to, for example, 7 ⁇ m or less, the surface layer of the external electrode has a glass surface. There will be no phase or only a trace amount. For this reason, the external electrode absorbs moisture from the outside air, and there is a possibility that the moisture may enter the component body through the external electrode.
- the plating solution may penetrate the external electrode and enter the component body. is there.
- the present invention has been made in view of such circumstances, and a conductive paste suitable for forming external electrodes, and moisture resistance and plating resistance without causing structural defects even when the thickness of the external electrodes is reduced.
- An object of the present invention is to provide an electronic component such as a multilayer ceramic capacitor that can ensure liquidity and has good plating properties, and an electronic component manufacturing method that manufactures an electronic component using the conductive paste.
- the present inventors have conducted intensive studies on the molar content of the Si component in the glass frit contained in the conductive paste, the volume content of the glass frit, and the shape of the metal powder.
- the molar content of SiO 2 in the glass frit is set to 36 to 59 mol%
- the volume content of the glass frit is set to 6 to 11% by volume
- the ratio of the maximum length a to the maximum thickness b of the metal powder hereinafter, it is referred to as “aspect ratio.”
- the conductive paste according to the present invention is a conductive paste for forming an external electrode of an electronic component, and includes a metal powder and at least a Si component.
- the metal powder contains an organic vehicle and the metal powder is formed into a flat shape in which a ratio a / b of a maximum length a to a maximum thickness b is 2.5 or more, and the metal powder in the glass frit
- the molar content of the Si component is 36 to 59 mol% in terms of SiO 2
- the volume content of the glass frit is 6 to 11 vol%.
- the external electrode is sintered with an appropriate mixture of glass frit and metal powder. This makes it possible to improve the sealing performance of the surface layer without causing structural defects of the electronic component.
- the metal powder having the above aspect ratio can be present along the surface of the external electrode, it is possible to secure a sufficient amount of metal powder as a starting point for forming the plating film, and to achieve a desired good plating. Adhesiveness can be secured. As a result, it is possible to obtain an external electrode for electronic parts having both moisture resistance, plating solution resistance and plating property.
- the “flat shape” means a generic name such as a flake shape, a scale shape, a plate shape, or a coin shape
- the main surface shape is a circular shape, an elliptical shape, or a distorted shape having a depression.
- the thickness is not limited to the one formed to have a constant thickness, but includes one having a strain.
- the present inventors analyzed the external electrode composition of the electronic component obtained by using the above conductive paste, it was found that the Si content in the glass phase was 38 to 60 mol%. Further, the cross section of the electronic component in the vicinity of the external electrode was observed with a scanning electron microscope (hereinafter referred to as “SEM”) and analyzed by a predetermined method. As a result, the occupation ratio of the glass phase in the external electrode was determined as an area ratio. It was found that the maximum length c of the glass phase was 5 ⁇ m or less.
- SEM scanning electron microscope
- an electronic component according to the present invention is an electronic component in which an external electrode is formed so as to cover an end of a component element body, and at least one or more plating films are formed on the surface of the external electrode.
- the external electrode is sintered in a state in which a glass phase containing at least a Si component and a metal part are mixed, and the molar content of the Si component in the glass phase is 38 to 40 in terms of SiO 2.
- the occupation ratio of the glass phase in the external electrode is 30 to 60% by area ratio, the maximum length c of the glass phase is 5 ⁇ m or less, and the occupation ratio is In a central region of the end face of the component element body, a distance between a first straight line parallel to the end face intersecting at the shortest distance position from the end face of the component element body to the interface between the external electrode and the plating film, and the end face Wrapped in The portion is calculated as a measured region, and the maximum length c intersects at the longest distance position from the end surface of the component element body to the surface layer surface of the plating film in contact with the interface in the central region of the end surface of the component element body.
- the glass phase existing on an intermediate line that equally divides the distance between the second straight line parallel to the end face and the first straight line is extracted, and the extracted glass phase is parallel to the end face. It is characterized by its maximum length.
- the penetration distance of the glass phase into the component element body is 1 ⁇ m or less (including 0).
- the claim for protection of electronic parts is also based on what kind of conductive paste the external electrode uses from the electronic parts as finished products widely distributed in the market. This is because it has been considered that it is difficult to specify whether or not it is manufactured.
- an electronic component manufacturing method is an electronic component manufacturing method for manufacturing an electronic component in which an external electrode is formed on a surface of a component element body, and the conductive paste described above is applied to the component element body. It is characterized in that the external electrode is formed by applying on the surface and performing a baking treatment.
- the baking treatment is performed at a temperature near the softening start temperature of the glass frit contained in the conductive paste.
- the metal powder contains a glass frit containing at least a Si component and an organic vehicle, and the metal powder has a ratio a / b between the maximum length a and the maximum thickness b. It is formed into a flat shape of 2.5 or more, and the molar content of the Si component in the glass frit is 36 to 59 mol% in terms of SiO 2 , and the volume content of the glass frit.
- the external electrode is formed by using this conductive paste, the external electrode is sintered with an appropriate mixture of glass frit and metal powder. A glass phase can be present in the electrode, which improves the sealing performance of the surface layer of the external electrode without causing structural defects in the electronic component.
- the metal powder having the above aspect ratio can be present along the surface of the external electrode, it is possible to secure a sufficient amount of metal powder as a starting point for forming the plating film, and to achieve a desired good plating. Adhesiveness can be secured. As a result, it is possible to obtain an external electrode having both moisture resistance, plating solution resistance and plating resistance.
- the external electrode is formed so as to cover the end of the component element body, and at least one or more plating films are formed on the surface of the external electrode.
- the external electrode is sintered in a state where a glass phase containing at least a Si component and a metal part are mixed, and the content molar amount of the Si component in the glass phase is 38 to 60 in terms of SiO 2.
- the occupation ratio of the glass phase in the external electrode is 30 to 60% in terms of area ratio, and the maximum length c of the glass phase is 5 ⁇ m or less.
- the enclosed siege part The maximum length c is calculated as a measurement region, and the maximum length c intersects the end surface at the longest distance position from the end surface of the component element body to the surface layer surface of the plating film in contact with the interface in the central region of the end surface of the component element body.
- the glass phase existing on an intermediate line that equally divides the distance between the parallel second straight line and the first straight line is extracted, and the length of the extracted glass phase in the direction parallel to the end face is extracted.
- the occupation ratio and the maximum length c of the glass phase can be easily calculated by analyzing the crystal structure of the cross section of the external electrode by the method described above.
- an electronic component manufacturing method for manufacturing an electronic component by forming an external electrode on the surface of the component element body, wherein the above-described conductive paste is applied to the component element body. Since the external electrode is formed by coating on the surface and performing a baking treatment, even if the film thickness of the external electrode is reduced, the moisture resistance and plating solution resistance are good, and there is a good plating property. It is possible to obtain a small and large-capacity electronic component with excellent reliability that can suppress the occurrence of defects.
- FIG. 1 is a cross-sectional view schematically showing a monolithic ceramic capacitor as one embodiment of an electronic component according to the present invention. It is the A section expanded sectional view of Drawing 1, and is a figure explaining the calculation method of the share of a glass phase. It is A section expanded sectional drawing of FIG. 1, Comprising: It is sectional drawing for demonstrating the calculation method of the maximum length c of a glass phase. It is A section expanded sectional drawing of FIG. 1, Comprising: It is sectional drawing for demonstrating the calculation method of the maximum length c of a glass phase. 6 is an SEM image of sample number 14 in Example 2. In Example 2, it is a SEM image of the sample number 14 for demonstrating an example of the calculation method of the occupation rate of a glass phase.
- Example 3 it is a SEM image of the sample number 24 for demonstrating an example of the calculation method of the maximum length c of a glass phase. In Example 3, it is a SEM image of the sample number 24 for demonstrating an example of the calculation method of the maximum length c of a glass phase.
- the conductive paste according to the present invention contains a metal powder, a glass frit containing at least a Si component, and an organic vehicle.
- the metal powder is formed in a flat shape with an aspect ratio (ratio between the maximum length a and the maximum thickness b) a / b of 2.5 or more, and the molar content of the Si component in the glass frit is In terms of SiO 2 , it is 36 to 59 mol%, and the volume content of the glass frit is 6 to 11 vol%.
- the “flat shape” means a generic name such as flake shape, scale shape, plate shape, coin shape, etc.
- the main surface shape includes a circular shape, an elliptical shape, or a distorted shape having a depression.
- the thickness is not limited to the one formed to have a constant thickness, but includes one having distortion.
- the external electrode is sintered with a glass frit and metal powder mixed in an appropriate amount. Therefore, the sealing performance of the surface layer of the external electrode can be improved without causing a structural defect of the electronic component. And, since the sealing performance of the surface layer of the external electrode is improved in this way, it is possible to avoid moisture ingress from the outside air and infiltration of the plating solution in the plating process, and to improve moisture resistance and plating solution resistance Can do.
- the metal powder has a flat shape as described above, the metal powder serving as the starting point for forming the plating film can be present along the surface of the surface of the external electrode. Even if the surface of the electrode is plated, it is possible to avoid the discontinuous formation of the plating film and to ensure good plating properties.
- Si component is a main component of the glass frit and is amorphized to form a network network structure.
- the content molar amount of the Si component in the glass frit is reduced, a network-like network structure cannot be sufficiently formed. Therefore, when the surface of the external electrode is subjected to plating treatment, The glass phase may be dissolved in the plating solution. In particular, when the thickness of the external electrode is reduced, the plating solution in which the glass phase is dissolved may permeate the external electrode and enter the component body. In order to avoid the occurrence of such a situation, it is necessary to convert the content molar amount of the Si component in the glass phase after firing into 38 mol% or more in terms of SiO 2. It is necessary to make it 36 mol% or more in the state of the glass frit in the conductive paste.
- the content molar amount of the Si component in the glass phase after firing is converted to SiO 2 and exceeds 60 mol% after firing, the fixing force between the component body and the external electrode is reduced, and peeling and the like There is a risk of causing structural defects. And in order to avoid such a situation, it is necessary not to exceed 60 mol% in the glass phase after firing. For that purpose, it is necessary to prevent the state of the glass frit in the conductive paste before firing. It is necessary not to exceed mol%.
- the molar content of the Si component in the glass frit in the conductive paste is adjusted to be 36 to 59 mol% in terms of SiO 2 .
- the content molar amount of the Si component in the glass phase after firing is 45 mol% or more in terms of SiO 2 and 43 mol% or more in the state of the glass frit before firing. By doing so, it becomes possible to further reduce the amount of dissolution of the glass phase in the external electrode into the plating solution.
- the volume content of the glass frit is less than 6% by volume, the volume content of the glass frit is too small, so that the adhesive strength between the component body and the external electrode cannot be sufficiently secured, and peeling or the like May cause structural defects.
- the volume content of the glass frit exceeds 11% by volume, the glass phase formed on the surface layer of the external electrode becomes excessive and the electrical conductivity of the external electrode is reduced. There is a possibility that the plating film formed on the electrode lacks continuity.
- the volume content of the glass frit in the conductive paste is set to 6 to 11% by volume.
- Such a glass frit is not particularly limited as long as it contains a Si component, but usually a Si—B glass frit mainly composed of SiO 2 and B 2 O 3 is preferably used. be able to.
- Si—BA alkali metal
- Si—BA alkali metal
- Si—BA alkali metal glass frit obtained by adding an alkali metal oxide such as Li 2 O, Na 2 O, K 2 O to these SiO 2 and B 2 O 3 , SiO 2 and B 2 2 O 3 in the Bi 2 O 3 Si-B- Bi -based glass frit was added, Si-B-Zn-based glass frit was added to ZnO 2 to SiO 2 and B 2 O 3, the SiO 2 and B 2 O 3 Si—B—Zr—Ti glass frit to which ZrO 2 or TiO 2 is added can be used as appropriate.
- Si—BA alkali metal glass frit obtained by adding an alkali metal oxide such as Li 2 O, Na 2 O, K 2 O to these SiO 2 and B 2 O
- the aspect ratio a / b of the metal powder is less than 2.5, an excessive glass phase is formed on the surface layer surface, while the entire shape of the metal powder becomes a spherical shape or an elliptical sphere shape.
- the starting metal powder cannot be sufficiently secured on the surface of the surface, which may lead to a reduction in plating property and the plating film may lack continuity.
- the metal powder serving as a starting point for forming a plating film is present in a form along the surface layer.
- the desired good plating property is obtained.
- the upper limit of the aspect ratio a / b is not particularly limited, but from the viewpoint of ensuring a balance with the glass phase generated on the surface of the external electrode, the aspect ratio a / b is 10.5. The following is desirable.
- Such a metal powder is not particularly limited, but a base metal material such as Cu, Ni, or Cu—Ni alloy having good conductivity at low cost can be preferably used.
- This conductive paste can be easily obtained by weighing and mixing the above-described flat metal powder, glass frit, and organic vehicle so as to have a predetermined mixing ratio, and dispersing and kneading using a three-roll mill or the like. Can be manufactured.
- the organic vehicle is prepared such that the binder resin is dissolved in an organic solvent, and the mixing ratio of the binder resin and the organic solvent is, for example, 1 to 3: 7 to 9 by volume ratio. .
- the binder resin is not particularly limited, and for example, ethyl cellulose resin, nitrocellulose resin, acrylic resin, alkyd resin, or a combination thereof can be used.
- the organic solvent is not particularly limited, and ⁇ -terpineol, xylene, toluene, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monoethyl ether acetate, etc. alone or in combination thereof Can be used.
- FIG. 1 is a cross-sectional view schematically showing an embodiment of a multilayer ceramic capacitor as an electronic component according to the present invention.
- This multilayer ceramic capacitor has a component body 4 in which dielectric layers 1 and internal electrodes 2 and 3 are alternately stacked, and external electrodes 5 a and 5 b are formed on the outer surface of the component body 4. ing. Further, first plating films 6a and 6b are formed on the surfaces of the external electrodes 5a and 5b, and second plating films 7a and 7b are formed on the surfaces of the first plating films 6a and 6b. Furthermore, third plating films 8a and 8b are formed on the surfaces of the second plating films 7a and 7b.
- the internal electrode 2 is drawn out to one end face and electrically connected to the external electrode 5a, and the internal electrode 3 is drawn out to the other end face and electrically connected to the external electrode 5b, via the dielectric layer 1.
- the capacitance can be acquired.
- the material for forming the internal electrodes 2 and 3 is not particularly limited, but it is preferable to use Ni, Cu, Ag, and an alloy containing these at a low cost.
- the first plating films 6a and 6b are made of a material having the same quality as the metal powder in the external electrodes 5a and 5b, for example, Cu or Cu alloy in the case of using Cu or Cu alloy for the metal powder in consideration of the plating property and conductivity. And Cu alloy are preferably used. When Ni or Ni alloy is used for the metal powder, Ni or Ni alloy is preferably used.
- the second plating films 7a and 7b are formed of Ni or Ni alloy from the viewpoint of obtaining good heat resistance.
- the third plating films 8a and 8b are formed of Sn, solder, or the like from the viewpoint of obtaining good solderability.
- this multilayer ceramic capacitor can be manufactured as follows.
- ceramic raw materials such as Ba compound and Ti compound are prepared, a predetermined amount of these ceramic raw materials are weighed, and the weighed material is mixed with grinding media such as PSZ (Partially Stabilized Zirconia) balls and pure water. It is put into a ball mill, sufficiently mixed and pulverized in a wet state, dried, and calcined at a temperature of 900 to 1200 ° C. for a predetermined time, thereby producing a calcined powder made of a barium titanate compound or the like.
- grinding media such as PSZ (Partially Stabilized Zirconia) balls and pure water. It is put into a ball mill, sufficiently mixed and pulverized in a wet state, dried, and calcined at a temperature of 900 to 1200 ° C. for a predetermined time, thereby producing a calcined powder made of a barium titanate compound or the like.
- the calcined powder is again put into a ball mill together with an organic binder, an organic solvent, and a pulverizing medium and wet-mixed to prepare a ceramic slurry, which is formed into a ceramic slurry by a doctor blade method, etc. A sheet is produced.
- second conductive paste a metal powder such as Ni powder is mixed with an organic vehicle and an organic solvent and kneaded with a three-roll mill or the like, thereby producing a conductive paste for internal electrodes (hereinafter referred to as “second conductive paste”). To do.
- the ceramic green sheets are sandwiched between ceramic green sheets on which a conductive film is not formed, crimped, and cut into predetermined dimensions to obtain a ceramic laminate.
- the binder removal treatment is performed at a temperature of 300 to 500 ° C., and further, in a reducing atmosphere composed of H 2 —N 2 —H 2 O gas whose oxygen partial pressure is controlled to 10 ⁇ 9 to 10 ⁇ 12 MPa.
- baking is performed at a temperature of 1100 to 1300 ° C. for about 2 hours.
- the conductive film and the ceramic green sheet are co-sintered to produce the component body 4 in which the dielectric layers 1 and the internal electrodes 2 and 3 are alternately laminated.
- the temperature during the baking treatment is a temperature in the vicinity of the softening start temperature of the glass frit contained in the conductive paste.
- the content molar amount of the Si component in the glass frit is as large as 36 to 59 mol% in terms of SiO 2 , but the content molar amount of the Si component in the glass frit is thus large.
- the higher the softening start temperature of the glass frit the lower the wettability between the metal powder or component body 4 and the glass frit. There is a possibility that the glass frit is segregated on the layer surface.
- the baking treatment is preferably performed at a temperature in the vicinity of the softening start temperature of the glass frit (for example, 600 to 700 ° C.).
- first plating films 6a and 6b made of Ni, Cu, Ni—Cu alloy or the like on the surfaces of the external electrodes 5a and 5b, and the first plating films 6a and 6b.
- the second plating films 7a and 7b made of Ni or the like are formed on the surface, and the third plating films 8a and 8b made of solder, tin or the like are formed on the surfaces of the second plating films 7a and 7b, Thereby, a multilayer ceramic capacitor is manufactured.
- the Si component content of the glass frit in the conductive paste is 36 to 59 mol% in terms of SiO 2 , so the Si component in the glass phase 10 after firing.
- the content molar amount of the metal is 38 to 60 mol% in terms of SiO 2 , which can prevent the glass phase 10 from being dissolved in the plating solution during the plating process, so that the plating solution is used as the external electrodes 5a and 5b. Can be avoided. Further, since a sufficient fixing force can be ensured, structural defects such as peeling and cracks are not caused.
- the volume content of the glass frit in the conductive paste is 6 to 11% by volume
- the occupation ratio of the glass phase 10 in the external electrodes 5a and 5b is 30 to 60% in terms of area ratio, and the external electrode 5a A sufficient glass phase 10 can be formed on the surface layer surface of 5b, and good adhesion and good resistance to moisture and plating solution can be obtained.
- the aspect ratio a / b of the metal powder is 2.5 or more, the maximum length c of the glass phase 10 can be suppressed to 5 ⁇ m or less, and a glass phase that can secure sealing properties is formed.
- the metal powder used as the starting point of plating film formation can be made to exist along the surface, and this can provide favorable plating property and can ensure the continuity of the plating film.
- FIG. 2 is an enlarged cross-sectional view of an end surface central region (A portion in FIG. 1) of the component element body 4.
- the external electrode 5b is formed so as to cover the surface of the end portion of the component element body 4, and the first to third plating films 6b to 8b are formed in layers so as to cover the surface of the external electrode 5b. Yes.
- the external electrode 5b is sintered in a state where the metal part 9 mainly composed of metal powder and the glass phase 10 made of glass frit are mixed.
- a straight line L1 in contact with the end face 11 of the component element body 4 is drawn.
- a straight line (first straight line) L2 intersecting with the shortest distance position from the end surface 11 to the interface between the external electrode 5b and the first plating film 6b is drawn in parallel with the end surface 11.
- the surrounding portion surrounded by the straight line L1 and the straight line L2 is set as a measurement region, and the area of the surrounding portion and the area occupied by the glass phase 10 are obtained, thereby calculating the area ratio of the glass phase 10, that is, the occupation ratio. can do.
- the metal part 9 and the glass phase 10 can be easily distinguished by binarizing the cross section in the center region of the end face of the external electrode 5b into white and gray on the SEM.
- the occupation rate of the glass phase 10 is controlled to 30 to 60% by an area ratio by making the volume content of the glass frit in an electrically conductive paste into 6 to 11 volume%.
- 3 and 4 show a method for calculating the maximum length c of the glass phase 10.
- the glass phase 10 existing on the intermediate line L5 is extracted, and the length in the direction parallel to the end face 11 is obtained from the extracted glass phase 10, and this maximum value is determined as the maximum length. c.
- the maximum length c of the glass phase 10 can be suppressed to 5 ⁇ m or less. The adherability is secured.
- the external electrodes 5a and 5b are sintered in a state where the glass frit containing at least the Si component and the metal powder are mixed, and the molar content of the Si component in the glass frit is small.
- SiO 2 it is 38 to 60 mol%
- the occupation ratio of the glass phase in the external electrodes 5a and 5b is 30 to 60% in terms of area ratio
- the maximum length c of the glass phase 10 is Since it is 5 ⁇ m or less, even if the thickness of the external electrodes 5a and 5b is thin, it is possible to achieve both moisture resistance and plating solution resistance and plating performance, and the component body 4 and the external electrodes 5a and 5b.
- the penetration distance of the glass phase 10 into the component body 4 can be suppressed to 1 ⁇ m or less (including 0). Thus, it is possible to avoid the glass phase 10 from reacting with the component body 4.
- the glass phase 10 reacts with the component body 4, and the glass phase 10 in the external electrodes 5 a and 5 b becomes the component body 4. It penetrates to a depth of 1 ⁇ m or more on the side, and as a result, cavities are formed in the external electrodes 5a and 5b to absorb moisture and the desired moisture resistance may not be obtained.
- the permeation distance of the glass phase 10 into the component body 4 is suppressed to 1 ⁇ m or less (including 0) by performing the baking treatment at a temperature near the softening start temperature of the glass frit. This avoids the formation of cavities in the external electrodes 5a and 5b, and ensures the desired moisture resistance.
- this invention is not limited to the said embodiment, It cannot be overemphasized that it can deform
- the multilayer ceramic capacitor is exemplified as the electronic component.
- the plating film has a three-layer structure. However, at least one layer is sufficient, and the same applies to a single-layer structure or a two-layer structure.
- An organic vehicle comprising 30% by weight of acrylic resin, 40% by weight of 3-methoxy-3-methyl-1-butanol and 30% by weight of terpineol was produced.
- the aspect ratio a / b of the Cu powder was measured by the following method.
- the Cu powder was kneaded and dispersed in an organic vehicle to prepare an aspect ratio measurement paste.
- the measurement paste was applied onto a PET (polyethylene terephthalate) film coated with a release agent and dried to prepare a Cu sheet on the PET film. Thereafter, after the Cu sheet was peeled from the PET film, the Cu sheet was embedded in a separately prepared resin and cured. Next, the end face of the resin was polished to expose the Cu sheet, thereby preparing a measurement sample.
- this measurement sample was photographed with an SEM to obtain an SEM image.
- the average value of the maximum length a and the maximum thickness b was measured using the length measurement function of image processing software ("A Image-kun” (registered trademark) manufactured by Asahi Kasei Engineering). And the aspect ratio a / b was measured.
- a ceramic green sheet containing BaTiO 3 as a main component and a second conductive paste for internal electrodes containing Ni as a conductive component were prepared.
- conductive pastes of sample numbers 1 to 9 were applied to both end faces of each component element body by a dipping method so that the film thickness after firing was 7 ⁇ m or less. Next, this was dried at 150 ° C. and then fired at 650 ° C. for 10 minutes in a reducing atmosphere to form external electrodes at both ends of the component body.
- the external dimensions of the sample manufactured in this way were 1.0 mm in length, 0.5 mm in width, and 0.5 mm in thickness.
- sample evaluation For each of the samples Nos. 1 to 9, a point analysis was performed on the center region of the end face of the component body using the WDX method, and a composition analysis of the glass phase in the external electrode was performed.
- the insulation resistance before and after the formation of the plating film was measured for each of 74 samples of sample numbers 1 to 9 using an insulation resistance meter.
- the insulation resistance is 10 ⁇ 6 ⁇ or more, it is determined that there was no ingress of moisture or plating solution that would affect the characteristics, and the resistance to moisture and plating solution was improved. It was determined as good ( ⁇ ). In addition, in the case where even one of the 74 samples had an insulation resistance of less than 10 ⁇ 6 ⁇ , the moisture resistance and plating solution resistance was judged as poor ( ⁇ ).
- the component body is fixed with a chuck of a tensile tester, the lead wire is pulled at a speed of 20 mm / min, and the electrode fixing strength was measured.
- Table 1 shows the SiO 2 amount before firing, the volume content of the glass frit, the aspect ratio of the metal powder, the glass composition after firing, the moisture resistance / plating solution resistance, and the adhesion strength of Sample Nos. 1 to 9. .
- Sample No. 1 has a low SiO 2 content of 10 mol% in the glass phase after firing, and it is impossible to sufficiently form a network network structure. It was found that the plating solution penetrated into the external electrode and was inferior in moisture resistance and plating solution resistance.
- Sample No. 2 has 38 mol% of SiO 2 in the glass phase after firing. Although SiO 2 is increased as compared with Sample No. 1, dissolution of the glass phase in the plating solution is avoided. Since the amount of SiO 2 is still small, it is not possible to sufficiently form a network network structure, and like the sample No. 1, the plating solution penetrates into the external electrode and is inferior in moisture resistance and plating solution resistance. I understood.
- Sample No. 9 has a high SiO 2 content of 65 mol% in the glass phase after firing and can secure the moisture resistance and plating solution resistance, but the adhesion strength is as small as 4 N / cm 2. I found it inferior.
- Sample Nos. 3 to 8 have a SiO 2 content of 38 to 60 mol% in the glass phase after firing and are within the scope of the present invention. Even if it exists, it turned out that moisture resistance and plating solution resistance can be ensured, without impairing adhesive force.
- the volume content of the glass frit was 5 to 12% by volume, the portion where the volume content of the glass frit was increased or decreased was adjusted with Cu powder, the organic vehicle and the dispersant were the same volume content as in Example 1, and the sample number Samples 11 to 17 (conductive paste) were prepared.
- the aspect ratio a / b of the Cu powder was 4.5 as in Example 1.
- samples multilayer ceramic capacitors with sample numbers 11 to 17 were produced by the same method and procedure as in Example 1.
- FIG. 5 is an SEM image obtained by polishing a cross-section of one external electrode of Sample No. 14 and capturing the center area of the end surface at a magnification of 2000 times.
- an external electrode 22 is formed on the surface of the component body 21, and a plating film 23 (Cu film, Ni film, and Sn film) is formed on the surface of the external electrode 22.
- the inside of the external electrode 22 is binarized into gray and white for the convenience of image analysis, white indicates the metal part 24 mainly composed of Cu, and gray indicates the glass phase 25.
- Table 2 shows the amount of SiO 2 before firing, the volume content of the glass frit, the aspect ratio of the metal powder, the glass composition after firing, the occupancy of the glass phase, the moisture resistance and plating resistance of each sample Nos. 11 to 17 It shows the property and adhesion.
- Sample No. 11 has a small glass frit volume content of 5% by volume, and therefore the occupancy of the glass phase 25 is as small as 27%. Therefore, the fixing force is as small as 4 N / cm 2 It was found that the adhesive strength was inferior.
- the volume content of the glass frit is as large as 12% by volume, and therefore the occupation ratio of the glass phase 25 is as large as 63%. Therefore, many glass phases 25 are present on the surface layer of the external electrode 22. It was found that the plating film was formed discontinuously, and the plating solution entered the external electrode 22 and was inferior in moisture resistance / plating solution resistance, particularly plating solution resistance.
- samples Nos. 12 to 16 are thin films having an external electrode thickness of 7 ⁇ m or less because the area ratio of the glass phase 25 in the external electrode 22 is 30 to 60% in the range of the present invention. Even so, it has been found that good moisture resistance and plating solution resistance can be secured without impairing the fixing force.
- Samples Nos. 21 to 30 were prepared by the same method and procedure as in Example 1 except that the aspect ratio a / b of the Cu powder was varied.
- the aspect ratio a / b was measured by the same method as in Example 1.
- each sample Nos. 21 to 30 was observed with an SEM. Then, it is checked whether or not the surface of the external electrode is completely covered with the Cu film, and the sample that is completely covered with the Cu film has a good plating property ( ⁇ ), and is completely covered with the Cu film. Samples that were not plated were considered to have poor plating properties (x).
- Example 2 the cross section of one external electrode of Sample No. 24 was polished, and the center area of the end face was imaged at a magnification of 2000 times.
- a straight line L3 having the shortest distance from the end surface 26 of the component element body 21 to the interface between the external electrode 22 and the plating film 23 is drawn parallel to the end surface 26, and from the end surface 26 to the plating film 23.
- a straight line L4 intersecting at the position of the longest distance to the surface layer surface of the first plating film was drawn in parallel with the end face 26.
- an intermediate line L5 that equally divides the distance between the straight line L3 and the straight line L4 was drawn.
- Table 3 shows the amount of SiO 2 before firing, the volume content of glass frit, the aspect ratio a / b of Cu powder, the glass composition after firing, the maximum length c of the glass phase, and the sample numbers 21 to 30. Plating property is shown.
- the sample number 21 has a small aspect ratio a / b of 1.5, the maximum length c of the glass phase 25 is as large as 5.6 ⁇ m. For this reason, it turned out that the metal powder used as the starting point of plating film formation decreases on a surface layer surface, and is inferior to plating property.
- sample numbers 22 to 30 use Cu powder having an aspect ratio a / b of 2.5 or more, so that the maximum length c of the glass phase 25 is 5 ⁇ m or less and good plating property can be secured. I understood.
- Internal electrode 3 Internal electrode 4 Component element body 5a, 5b External electrode 6a, 6b First plating film (plating film) 7a, 7b Second plating film (plating film) 8a, 8b Third plating film (plating film) 10 Glass phase
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Abstract
Description
Si成分は、ガラスフリットの主成分であり、非晶質化して網目状のネットワーク構造を形成する。
導電性ペースト中にガラスフリットを含有させることにより、焼成後の外部電極に十分なガラス相を形成することが可能となり、シール性の向上を図ることができる。そしてこれにより、外気からの水分浸入やめっき工程でのめっき液の浸入を回避することができ、耐湿性や耐めっき液性の向上を図ることができる。
導電性ペースト中に所定量のガラスフリットを含有させることにより、上述したように外部電極の表層面にはガラス相が形成され、これによりシール性が向上して耐湿性や耐めっき液性を向上させることが可能である。
まず、SiO2の含有モル量が6~62モル%となるようにH3BO3、SiO2、A2CO3(A:Li、Na、又はK)を秤量した。尚、SiO2の含有モル量については、導電性ペーストの作製後、WDX(波長分散型X線分析)法を使用し、点分析して求めた。
BaTiO3を主成分とするセラミックグリーンシートとNiを導電成分とする内部電極用の第2の導電性ペーストを用意した。
試料番号1~9の各試料について、部品素体の端面中央領域についてWDX法を使用して点分析し、外部電極中のガラス相の組成分析を行った。
3 内部電極
4 部品素体
5a、5b 外部電極
6a、6b 第1のめっき皮膜(めっき皮膜)
7a、7b 第2のめっき皮膜(めっき皮膜)
8a、8b 第3のめっき皮膜(めっき皮膜)
10 ガラス相
Claims (5)
- 電子部品の外部電極を形成するための導電性ペーストであって、
金属粉末と、少なくともSi成分を含んだガラスフリットと、有機ビヒクルとを含有し、
前記金属粉末は、最大長aと最大厚みbとの比a/bが2.5以上の扁平形状に形成されると共に、
前記ガラスフリット中の前記Si成分の含有モル量が、SiO2に換算し、36~59モル%であり、
かつ、前記ガラスフリットの体積含有量が、6~11体積%であることを特徴とする導電性ペースト。 - 外部電極が部品素体の端部を覆うように形成されると共に、該外部電極の表面に少なくとも一層以上のめっき皮膜が被覆形成された電子部品であって、
前記外部電極が、少なくともSi成分を含んだガラス相と金属部とが混在した状態で焼結されてなり、
前記ガラス相中のSi成分の含有モル量が、SiO2に換算して38~60モル%であり、
前記外部電極における前記ガラス相の占める占有率は、面積比率で30~60%とされると共に、前記ガラス相の最大長cが5μm以下とされ、
前記占有率は、前記部品素体の端面中央領域において、前記部品素体の端面から前記外部電極と前記めっき皮膜との界面までの最短距離位置で交差する前記端面と平行な第1の直線と、前記端面との間で囲まれた包囲部分を被測定領域として算出し、
前記最大長cは、前記部品素体の端面中央領域において、前記部品素体の端面から前記界面で接する前記めっき皮膜の表層面までの最長距離位置で交差する前記端面と平行な第2の直線と、前記第1の直線との間隔を等分する中間線上に存在する前記ガラス相を抽出し、前記抽出されたガラス相のうち、前記端面と平行方向の長さが最大値であることを特徴とする電子部品。 - 前記ガラス相の前記部品素体への浸透距離が、1μm以下(0を含む。)であることを特徴とする請求項2記載の電子部品。
- 部品素体の表面に外部電極を形成した電子部品を製造する電子部品の製造方法であって、
請求項1記載の導電性ペーストを前記部品素体の前記表面に塗布し、焼成処理を行なって前記外部電極を形成することを特徴とする電子部品の製造方法。 - 前記焼成処理は、前記導電性ペーストに含有されるガラスフリットの軟化開始温度近傍の温度で行なうことを特徴とする請求項4記載の電子部品の製造方法。
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JP2015187977A (ja) * | 2014-03-13 | 2015-10-29 | 三ツ星ベルト株式会社 | 導電性積層体及びその製造方法 |
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JP2015187977A (ja) * | 2014-03-13 | 2015-10-29 | 三ツ星ベルト株式会社 | 導電性積層体及びその製造方法 |
JP2019024065A (ja) * | 2017-07-25 | 2019-02-14 | 太陽誘電株式会社 | セラミック電子部品及びセラミック電子部品の製造方法 |
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US11443899B2 (en) | 2020-05-26 | 2022-09-13 | Murata Manufacturing Co., Ltd. | Multilayer ceramic electronic component and method of manufacturing the same |
WO2022168770A1 (ja) * | 2021-02-02 | 2022-08-11 | 株式会社村田製作所 | 電解コンデンサ |
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US10090108B2 (en) | 2018-10-02 |
JP5939475B2 (ja) | 2016-06-22 |
CN104137193A (zh) | 2014-11-05 |
US20170221635A1 (en) | 2017-08-03 |
US20140347783A1 (en) | 2014-11-27 |
JPWO2013128957A1 (ja) | 2015-07-30 |
CN104137193B (zh) | 2017-03-08 |
KR101655348B1 (ko) | 2016-09-07 |
KR20140123979A (ko) | 2014-10-23 |
US9653211B2 (en) | 2017-05-16 |
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