JPS5815742A - Engine part having flamed surface - Google Patents

Abstract

PURPOSE:To constitute an engine part excellent with heat resisting durability, by forming the upper most surface layer part of a flamed surface of the engine part with a fine ceramic layer, and the deepest layer part with a metallic layer, while the intermediate layer part with a porous material layer consisting of metallic powder and ceramic powder. CONSTITUTION:A flamed surface of cylinder liner, cylinde head, intake and exhaust valve, etc. in an engine is formed with the uppermost surface layer part A by a fine ceramic layer of ceramic powder 6, while with the deepest layer part C by a metallic layer of metallic powder. The intermediate layer part B is of a flame spraying layer continuously changed with compund ratio of metal coating ceramic powder 8 to metallic powder 7, in such a manner that the metal coating ceramic powder 8 is more contained to the upper layer side while the metallic powder 7 is more contained to the lower layer side. Then the constitutional powder continuously changes its grain size, and the larger grain size is used in the nearer about the center, thus a porous layer E is formed to improve heat insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to engine parts having contact surfaces such as exhaust valves and cylinder heads.

In diesel engines, the waste heat from the combustion exhaust gas is recovered by the supercharger and the heat is used effectively.
However, some of the heat energy generated by such an engine is dissipated to the outside of the machine from the parts that make up the ignition surface.

That amount of energy will be lost. ζO Therefore, in order to save energy in the engine, attempts have been made to improve engine parts 1) @ thermal properties. An example of this is the Proverbial Tobi TPII @ 106 Ma...
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Sintered solid 0494 exhaust valve, piston head, cylinder head, cylinder twinner @0 ignition m11
m! 14L< is mechanically joined. However, although it may be possible to put o1Tm*Hiro into practical use in a relatively small JIO engine with a heat insulation structure like this and with a relatively large bore diameter, there is also a problem with heat insulation in an engine with a relatively large bore diameter. Since the IIO thickness is several tens of meters or more, and the heat receiving area is large, the restrained thermal strain becomes large and damage due to thermal shock occurs relatively early. The bonding cost is 1114 times with IA*CI technology! It has problems such as insufficient kK. 9 to 4, for example Tokusho S-1407
No. 14 VCJP has excellent flame resistance of Se5 Akebono Tutas,
There has been a proposal to manufacture exhaust valves, cylinder liners, cylinder heads, piston heads, etc. themselves by sintering to take advantage of their corrosion resistance and wear resistance, but the stone parts obtained in this way are As mentioned above, it is less durable and more expensive than the Z-adhesive method described above, and its practical use is highly unlikely.
Although nine proposals have been made in the past, focusing on the excellent properties of ceramics for engine parts, many problems still remain in their practical application.

The present invention was devised in view of the current situation, and an object of the present invention is to provide engine parts that have excellent heat resistance and durability and can be manufactured at low cost.

For this reason, the present invention sets the outermost layer on the contact surface (with Tutus powder or metal coating). A metal powder/dry mixed powder and a metal-coated ceramic powder of type 01 or more than 1 to 1 form a layer with a porous layer at least in part and a thermally sprayed layer. By forming a contact surface that combines the excellent thermal insulation properties of ceramics and porous layers and the toughness of metals, it is possible to obtain excellent thermal insulation properties and strength. % of people.

Below is the present invention 01! The example will be explained based on the drawings. Figure 1 shows a 40mm diesel engine in cross section.
The present invention is applicable to engine parts because it has a catalytic surface.1 For example, a cylinder liner (1)
, cylinder spatula)/(2), piston head), exhaust valve (a), and air supply valve (5), respectively.
Touch fire *n.

U, @, U and @It, lLi radiation layer is formed - arei.

11 When such a sprayed layer is divided into the outermost layer, the deepest shield, and an intermediate layer between the two, the outermost layer is coated with a metal (e.g., alloy) on the surface. Metal coating-kl) A dense ceramic layer made of mixed powder, the deepest layer is a metal layer made of metal powder, and the middle layer is made of metal powder, Ryufix powder, and metal-coated ceramic powder type 01 or 3. (From the above), each layer is composed of a layer including at least a -sK porous layer.

The intermediate layer is generally made of metal powder and/or metal-coated ceramic powder, and must be made of metal powder and/or metal-coated ceramic powder. Figure 1 shows the pupil mode of the sprayed layer of the present invention.
(B) shows the middle layer, and (C) shows the deepest shield. ) is a dense ceramic layer made of ceramic powder (@), and the deepest shield part (C) is a metal layer made of metal powder < n (for example, alloy powder). The metal-coated ceramic powder (6) has a large amount, and the metal-coated ceramic powder (1) has a large amount of metal-coated ceramic powder (1).
2) and metal powder (continuously changing the mixing ratio of ηO to form nine radiation layers, and in this intermediate layer part (1), the particle size of the powder constituting it continuously changes, Near the center, a large grain of 11040 is used, and this relatively large grain of 111
Due to the end of 1011, a porous layer (Ic) is formed as shown in its 11 degrees/general density. Also, the iris 3 figure (IEI) 0 is basically the same as the one in (a). However, the metal-coated ceramic powder (2) of the intermediate layer II (II) and the metal powder (the distribution ratio of η and the particle size are intermittently changed) The ceramic layer of the outermost layer (A) is made of ceramic powder with a diameter of 7.0 mm, and the metal layer of the outermost layer (C) is made of ceramic powder. The intermediate layer (II) is composed of metal powder with an average particle size of 1z and a thickness of about 1110PsO, and the intermediate layer (II) is made of metal-coated ceramic powder with an average particle size of 15mm. o2 禦.

It is composed of 100 layers of metal powder and has a thickness of about 44G, of which the surface layer has a thickness of approximately 1.5 mm (OP), and the surface layer has a composite layer of metal-coated ceramic powder and metal powder, and the deeper layer has a thickness of approximately 44 mm. Each constitutes a porous layer.

The sprayed layer as described above has excellent heat insulation, toughness, high temperature corrosion resistance, and flexibility, and the piston head (2),
Applicable to cylinder head Ω), air supply valve (6), exhaust valve ←)K.

In the above embodiments, when particularly excellent toughness is desired, the structure of the third factor (c) is adopted.

In (C), the highest shield part (C) is a metal layer, and one point is the above-mentioned (
A), Same as (II), but the outermost layer II (A) is one layer of relatively small-diameter O metal coating layer Tuntsukus powder (1 layer of dense ceramics), and the outermost layer of the middle layer II (ml) is The powder grain weight in the outermost layer is a ceramic layer made of metal-coated powder (2) with a large particle size of 111, and the deeper layer is a ceramic layer with a continuously changing particle size and a round metal powder (7
4) with a porous layer (rich) of K.

In this case, the outermost ceramic layer S has an average grain size of 1
11SPmO metal coated powder) abbreviated to sO,
＃l 愼O thickness is composed of 4, and the most yielding layer w cc)
oMetal layer line average particle size 1s) Approximately 18G
, with a thickness of I1.0, and further includes an intermediate layer Its
(II) The above-mentioned ceramic layer composed of a metal-coated powder having an average particle diameter of SO and IIm, of which the surface layer has a thickness of approximately 4 mm and a thickness of 4 mm;
The average particle diameter is 1 isPs, 1
The porous layers are each made of LPs, 100/IsO metal powder.

In such a structured OII radiation layer, the outermost layer @ (A) is composed of metal-coated ceramic powder, and only 4 intermediate layers @ (B
) The surface layer side is also made of metal-coated ceramic powder, and the deep layer side is made of metal powder, so it is possible to obtain excellent properties with the O-coated metal and metal powder.
Therefore, it is suitable for cylinder litchi (1) and piston head <3).

Figure 1 (=) shows the structure of nine cases with emphasis on toughness and heat resistance, in this case the outermost layer 15 (A),
Intermediate layer @ (B) Both metal-coated ceramic powder (2
), that is, the outermost layer (A)
is made of metal-coated ceramic powder with a relatively small diameter, and the intermediate layer (1) is a ceramic layer made of metal-coated ceramic powder whose particle size continuously changes), ζO
Intermediate layer II (B) constitutes a porous layer (illustration).

In the case of ζO, the outermost layer II (A) is made of metal-coated ceramic powder with an average particle size of 11p9%. The metal layer of the deepest shield part (C) is composed of metal powder with an average particle size of 15 Pss and has a thickness of about 1 pm, and the intermediate layer 1s (II) has a thickness of about 1 pm. It has a thickness of about 300 Pa and is made of a metal coating of 30 PPm-100j1 and an electric conductor powder.

In such a structure 0III radiation layer, the outermost layer II (A) and the middle layer IICB) are all made of metal-coated ceramic powder).
Because of its structure, the coating metal has the ability to provide both toughness and the heat resistance of ceramics, making it suitable for cylinder lychees (1).

In the embodiment described above, the particle size of the powder constituting the intermediate layer forming the porous layer (K) changes continuously or intermittently, and the intermediate layer II (B) The particle size is maximum near the center of ζ0), and therefore the ratio of the actual density to the theoretical 1fj[K is also minimum near the center of ζ0. This writing ratio is required for the porous layer, so it is best to adjust it in the o, 1o-Q, eso range considering heat insulation and toughness. is selected as a suitable drying process, so that the particle size is maximized near the center of the middle layer (CB), and the particle size is relatively small on the surface layer side and deep layer side. K, the fragile porous area near the center is reinforced.

Regarding the 811 powder that forms the sprayed layer, for example, as a ceramic powder, it is difficult to use. 0.・Tsatsutassu powder, etc., is also used as a metal powder, l0Cr-1ONt @
end, 5ocr-voxis end, 0AA-10cr-
A high melting point powder such as 10XtB powder is used, and as a metal-coated ceramic powder, a ceramic powder coated with 1 (lcr-1ONl or @@Cr-ON1, etc.) is used, but it is not necessarily limited to these. 1 in what is done
The thickness of the sprayed layer is selected appropriately depending on the required high toughness and heat insulation properties, but it is preferable that it be suppressed to about 1 - from 70 maximum wire toughness, etc. 〇Experientially speaking, a particle size of 3 or more is preferable in order to create a uniform molten layer, and in relation to the layer thickness, a particle size of 11 + O or less is adopted. .

In addition, as mentioned above, the 1kII radiation layer is formed into an IR type by the Gutsuzu-v11 radiation, fire l & yam radiation, and the thermal spray O conditions are 081111. It is determined as appropriate depending on the particle size and the required number of pores in the porous layer.

More than 0! 5 tlllj10111 shot 71 tso0
The engine parts included in the igniter 11 are located on its surface shield (mu)
It is composed of 1111 settsudentutas (- and the metal coating is made of tsuitutsutas powder and JI+) which has excellent strength and corrosion resistance, and in addition, it has the highest strength and corrosion resistance. ) is made of metal, and it is necessary
Intermediate layer Ill (1) and outermost layer iI(mu)K according to HC
Because it uses metal (made of metal powder or coated metal)
Therefore, it is possible to obtain good H-layer properties with the base material and excellent toughness.

In addition, the porous layer formed by the intermediate layer (11 (m) km) provides excellent heat insulation properties, which effectively suppresses heat dissipation from between the catalysts to the outside of the O engine. Figure 3 shows the weighted sprayed layer shown in Figure 3II (a) with its catalytic flame W.
Figure 4 shows the temperature distribution when using the valve stem O.
0, and the test engine conditions are as follows: 0/9.
In addition, a thermocouple was inserted into the temperature measurement wire valve stem, and the measurement was carried out via a ζO thermocouple.

Number of cylinders: 3 cylinders Cylinder diameter: 400 ■True rotation speed: 514 rpm Output: 111! ! 0 ps (rated 75 chronic load) In 1i, (1) #i thermal spray layer, (1) indicates the base material is also O, and the original W140 valve stem U (b) shown in (1)
It can be seen that it exhibits better heat insulation properties than the conventional O valve stem without the sprayed layer shown in .

When using the engine parts of the present invention having heat insulating properties as described above, the exhaust temperature of the engine can be increased by approximately 1 to 1, which is achieved by the supercharger KjP-. The heat output can be increased by more than 11 times compared to conventional engines. Along with this, if O insulation reinforcement such as exhaust pipe etc. is also carried out, the thermal efficiency of engine engine will be reduced to the conventional Os.
@Tou1! It turns out that it is possible to improve the degree of SO from degree i. In addition, conventional O piston heads, cylinder heads, cylinder liners, etc. were water-cooled on the inner wall side to ensure durability, but with the engine parts of the present invention:
The towt thermal layer (porous layer) can lower the material height by approximately 130 to 11 degrees Celsius compared to conventional methods, ensuring the durability of the aggregate itself. Alternatively, it becomes possible to use air cooling, which also makes it possible to increase the waste heat yield.

The sprayed layer O structure adopted in this project is used for engine parts, and is used for general insulation purposes, such as garbage incinerator O heat recovery equipment, and so O exchange. Equipment, etc., 4)
It can be applied to processing equipment and parts.

According to the above-mentioned nine books 111jlK, the catalytic layer 11tC- is made to form a stratified layer by the structure and metal, and the outermost layer of the OII radiation layer O is the shield part @1key (structured by the tutus).
By adding R, the strength and corrosion resistance of KIE are reduced, and in addition, the prefecture shield part is made of metal, and 4.
According to the requirement 11, it is possible to obtain good adhesion and excellent toughness to the O″ee base material by using IIK metal in the middle shield part and the outermost layer. (The porous layer) provides excellent thermal insulation;
If the contact surface itself can be made to have excellent durability, its heat insulating effect can effectively prevent O heat dissipation from the contact surface to the outside of the engine. This rounding greatly increases the engine O# air temperature compared to the conventional method, and by effectively circulating the heat, the engine **0
#Thermal efficiency! East) You can pull yourself up, and the dead weight is -1.
(9) Lower the base material temperature of engine parts (by the above-mentioned insulation effect),
The durability of the motherboard itself can be ensured by 4.

Moreover, it is possible to manufacture the mold at an extremely low cost using the ordinary O spraying method, even though it contains 1 kl of mold, which is above the actual light line.
Based on the above, it is a plant with high utility value for the prefecture.

Be111 page 0 @Leather I! - No. 1 @It;i The engine parts of the present invention are applied to carpenters y
FIG. Part 1 I) to (1) show the details of the sprayed layer adopted by Honjitsu! Figure 3 shows the temperature distribution inside the valve stem in an experimental example in which this Ji- was applied to the engine O valve stem. Powder) is a metal se5ix powder.

(M) Dose surface layer W% (B) shows the intermediate layer part, (C) shows the shield part, (D) shows the base material, and (E) shows the porous layer.

Yuho Ren Nippon Steel Tube Co., Ltd. Jl Usha Yama [1 Take Umioka
Hiroshi Okamoto 6th
Masaaki SuizukiFl
11 Fuji Tamatabu

Claims (1)

[Claims] The outermost layer of the toucher 11 is coated with a ceramic or metal coating.
[-- a dense tortoise-cutting layer made of truncus powder, the outermost layer being a metal layer, and the middle layer being a metal powder, one of the truncus powder and the metal-coated trunox powder.
s and above), engine parts having a catalytic surface formed by forming a thermally sprayed layer containing a porous layer in at least a portion thereof.