JPS5910979B2 - Method for manufacturing heat-resistant composite sintered body - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a heat-resistant composite sintered body.

In particular, the present invention relates to a method for producing a metal-ceramic composite sintered body having excellent mechanical strength, oxidation resistance, corrosion resistance, and wear resistance at high temperatures. 25 Many conventional metal-ceramic composite sintered bodies have been developed as cemented carbide or cermet for the purpose of having high hardness or high-temperature strength and toughness, and the scope of their use is gradually expanding. .

However, these conventional cemented carbide 30 and cermets all have a metal matrix (base), so when used at high temperatures, the strength and hardness deteriorate significantly due to softening of the metal matrix. In addition, the maximum operating temperature of conventional composite sintered bodies has been quite low because they suffer from severe oxidation due to long-term use in air35. Contrary to these circumstances, with recent advances in high temperature engineering, there has been a strong desire for the emergence of mechanical parts, friction parts, etc. that can be used at higher temperatures. In view of the above circumstances, it is an object of the present invention to provide a method for manufacturing a composite sintered body that can sufficiently withstand use even at higher temperatures by improving the drawbacks of conventional composite sintered bodies. be.

In other words, the process of pressure-forming and heating metal material powder, which is the raw material for conventional sintered machine parts, friction parts, bearings, etc., to which an organosilicon polymer compound or the organic compound and ceramic fibers are added. The present invention has been completed based on the new finding that a composite sintered body having excellent performance even at high temperatures can be obtained by a manufacturing method including a sintering step. . The manufacturing method of the present invention will be explained in detail below.

One of the raw materials that can be used in the present invention is the same type of metal material powder that has been conventionally used as a raw material for metal sintered bodies.

For example, pure Fe-based containing trace additives, Fe-C-based, F
e{u series, Fe-Cu series, Fe-Ni series, Fe-Ni
-Cu series, Fe-Cr series, Fe-Mn series, Fe-Mn-
Iron-based metal materials such as C-based, Fe-Pb-C-based, various stainless steels, and low alloy steels, Cu-Sn-based, Cu-Sn-
C-based, Cu-Zn-based, Cu-Ni-based, Cu-Ni-Zn
copper-based metal materials such as CU-At, Cu-Pb, and Cu-C; nickel-based metal materials such as Ni-Cr and Ni-Cr-CO; and cobalt such as CO-Ni-Cr. Powder of superalloy metal materials such as Nichrome, Hastelloy, Inconel, Teimken, etc. can be used in the present invention. However, the metal material powder may be a pre-alloyed powder or a mixed powder of individual metal element powders corresponding to the composition of the alloy, whichever is more advantageous. . Further, even if the metal material powder particles contain a small amount of nonmetallic substances such as ceramics such as oxides and nitrides, they can be used satisfactorily in the present invention. Next, the organosilicon polymer compound whose main skeleton components are carbon and silicon used as an additive in the present invention is one that the present inventors have already applied for invention L1 patent, and patent application No. 50-502.
No. 23, (Japanese Unexamined Patent Publication No. 126300/1982), Patent Application No. 1973
-149468 (Japanese Unexamined Patent Application No. 52-74000), Japanese Patent Application No. 51-21365 (Unexamined Japanese Patent Application No. 52-112700)
The method for producing this compound will be briefly described below, starting from the organosilicon polymer compound whose main skeleton components are silicon and carbon used in the present invention. The organosilicon compound that can be used as a raw material is one or two or more selected from the following types of dα1) to (sub).

(1) Compound containing only Si-C bonds R4 called silahydrocarbOn
Si, R3Si (R'SiR2) NR'SiR3, etc. and their carbon monofunctional derivatives belong to this category.

Example (CH3)4Si, (CH2CH)4Si, (C
H3)3SiC=CSi(CH3)3,(CH2)5S
i(CH2)4,(C2H5)3sicH2CH2ct
, (C6H5)5SiC02H, (2) Compounds containing Si-H bonds in addition to Si-C bonds, such as mono-, di-, and triorganosilanes, belong to this category.

Example (C2H5)2SiH2, (CH2)5SiH2, (
CH3)3SiCH2Si(CH3)2H, ctCH2
siH3, (3) Compound with Si-Hat bond
Organohalogen silanes excluding monosilane.

1) Compound with Si-N bond etc. are included in this.

Example Silylamine 5) Si-CR organoalkoxy (or alloxy) silane.

Example (CH3)2Si(0C2H5)2,C2H5SiC
22 (02H Eup), P-Ctc6H4Osi (CH3)
3, (6) Compounds with Si-CH bond Organosilanol examples (C2H5)3Si0H, (CH3)2
Si(0H)2, C6H5Si(0H)3, (8) S
It is a compound siloxane containing an i-0-Si bond.

Organosilicon (9) Organosilicon compound ester An ester thought to be formed from risilanol and an acid, (CH3)2S
i(0C0CH3)2, etc. belong to this category.

(S) Organosilicon compound peroxide; (CH3)3Si0
0C・(CH3)3,(CH3)3Si00Si(CH
3) 3 etc. In the above molecular structure (1 to {0), R represents an alkyl group or an aryl group. In the present invention, an organosilicon polymer compound having silicon and carbon as main skeleton components, for example, a compound having the following molecular structure, is produced from the raw materials.

(d) A substance containing the skeleton component of the above G)-f phase filtration as at least one partial structure among a chain structure and a three-dimensional structure, or a mixture of (a), (b), and (c).

Examples of compounds having the above molecular structure include the following. (d) Those containing the skeleton components described in (a) to (c) above as at least one partial structure among chain, cyclic, and three-dimensional structures, or a mixture of (i), (b), and (c).

Further, examples of organosilicon polymer compounds containing a different element in addition to silicon, carbon, hydrogen, and oxygen that can be used in the present invention include the following (e) to (e). (g) Polymer having a carborane nucleus The organosilicon polymer compound containing the above-mentioned foreign element can be synthesized by a known method.

In addition to organosilicon compounds containing different elements synthesized by the above-mentioned known methods, there are patents invented by the present inventors, Japanese Patent Application No. 50-149468 (Japanese Unexamined Patent Publication No. 52-74000).
and Japanese Patent Application No. 51-21365 (Japanese Patent Application No. 52-112
It can also be manufactured by the manufacturing method described in detail in the specification of No. 700). That is, at least one or more organometallic compounds selected from the organometallic compounds listed below (self) to (l) are added to the above-mentioned organosilicon compound, and the mixture is heated at 200 to 1500°C in a non-oxidizing atmosphere.
An organosilicon polymer compound containing a different element other than silicon, carbon, hydrogen, and oxygen can be synthesized by heating to a temperature range of . (self) Organosilicon compound containing nitrogen (substitute) Organometallic compound containing Group 1 metal (coordination-containing compound) 03 Organometallic compound containing group metal (coordination-containing compound)
(self) Organometallic compounds containing group metals (coordination-containing compounds)
, ? -Vrv' (self)
Organometallic compounds containing group metals (coordination compounds) (self)
Organometallic compounds containing Group V metals (coordination compounds) (5
) Organometallic compound containing a group metal (coordination-containing compound) (auto) Organometallic compound containing a group metal (coordination-containing compound) A9
Organometallic compounds containing group metals (coordination-containing compounds) Organosilicon polymer compounds whose main skeleton components are mainly silicon and carbon as shown in (a) to (d) above synthesized in this way. , the above (e) to (g), and (1) to (11)
At least one organosilicon polymer compound selected from among organosilicon polymer compounds having a different element in addition to silicon, carbon, hydrogen, and oxygen, which is produced from the compounds shown above, is added to the heat-resistant composite of the present invention. It can be used in the production of sintered bodies.

Further, in the present invention, a fiber-reinforced composite sintered body can be manufactured using various ceramic fibers as reinforcing materials.

As the reinforcing fibers, conventionally used fibers as shown in Table 1 or various whiskers can be used. Further, it is particularly advantageous to use fibers mainly made of SiC, which are produced from the organosilicon polymer compound used as an additive in the present invention, because they are compatible with the additive. Such composite effects of ceramic fibers are already well known, and there are various composite methods as described below. Mainly SiC
The manufacturing method and properties of this fiber will be briefly described below, but this fiber is characterized by being relatively easy and inexpensive to manufacture compared to other ceramic fibers and whiskers.

Furthermore, the fact that the diameter and length of the fibers can be substantially arbitrary is also advantageous for use in the present invention. The present inventors have already invented and applied for a patent on the method for manufacturing fibers made of this main fiber and Leli 7CSiC, and it was published in Japanese Patent Application No. 50-50529 (Japanese Unexamined Patent Publication No. 51-198).
No. 39929), Japanese Patent Application No. 52471 (1972)
1-130324), Japanese Patent Application No. 50-52472 (Japanese Unexamined Patent Publication No. 51-130325), Japanese Patent Application No. 58033-1983
No. (Japanese Unexamined Patent Publication No. 149925/1982), Patent Application No. 50-70
No. 32 (Japanese Unexamined Patent Publication No. 147623/1983), Patent Application No. 147623/1983
70303 (Japanese Unexamined Patent Application No. 51-147624), Japanese Patent Application No. 50-JMo V219 (Unexamined Japanese Patent Application No. 52-1136), Japanese Patent Application No. 79972 (Unexamined Japanese Patent Application No. 52-5321), No. 50-107371 (Japanese Unexamined Patent Publication No. 52-31126), Patent Application No. 132718 (Unexamined Japanese Patent Application No. 52-597)
No. 24), Japanese Patent Application No. 132719 (1982)
59725), Japanese Patent Application No. 50-136284 (Japanese Unexamined Patent Publication No. 52-63427), Japanese Patent Application No. 146267-1983 (
Japanese Patent Application Publication No. 1982-70122), Patent Application No. 1987-12199
No. (Japanese Unexamined Patent Publication No. 51-88064) and patent application No. 1988-1
This is explained in detail in the specification of No. 9378 (Japanese Unexamined Patent Publication No. 51-95068). Briefly describing these manufacturing methods, the organosilicon polymer compounds already mentioned are
After reducing the content of low molecular weight compounds, a spinning stock solution is prepared by using a solvent or by heating, which is then spun, heated at a low temperature in an oxidizing atmosphere, and then treated with a small amount of oxidizing gas. preheated in an atmosphere containing
After removing by-product impurities as necessary, the final step is to remove at least one selected from oxygen gas, air, inert gas, carbon monoxide gas, hydrogen gas, hydrocarbon gas, ozone, and water vapor in a vacuum. 800~ in one or more atmospheres
It is fired in a temperature range of 2000°C to form fibers mainly made of SiC. Typical properties of the fibers obtained by the above method are shown in Table 2. The diameter of the fibers to be composited in the present invention is preferably 10 to 100 μm, and can be used as a single fiber or as a fiber aggregate.

Next, the metal material powder and organosilicon polymerization. ``The method of mixing with a compound or the method of mixing an acid compound with fibers made of ceramics or the method of forming an aggregate will be described.

The organosilicon polymer compound can be obtained as a powder or a viscous liquid at room temperature.
It has the property of easily becoming a low-viscosity liquid by heating to around 300°C or by using a solvent that can dissolve it.

Therefore, when manufacturing a composite sintered body that does not use fibers, the metal material powder and the organosilicon polymer compound powder may be dry mixed using a mixer such as a rotating drum or a mixer. Alternatively, the organosilicon polymer compound can be made into a low viscosity solution using a solvent such as benzene, toluene, or hexane, and then wet-mixed using a mixer. In particular, when you want to reduce the amount of organosilicon polymer compound added, the wet mixing method is better.
This is advantageous because it is uniformly mixed with the metal material powder. In addition, in the case of raw materials in which fibers made of ceramics are also composited, if the fibers are used as short fibers with a length of 5 m or less, either the dry or wet mixing method described above can be used. When using a material with a length of 5 mm or more, in order to prevent the fibers from breaking, the fibers are added to the mixed powder of metal material powder and organosilicon polymer compound that have been mixed in advance by dry or wet mixing. It is more advantageous to use a method of burying.

Here, regarding the method of embedding fibers in the mixed powder, short fibers with a length of 5 m or less are buried so as to be as uniformly distributed as possible, and long fibers are buried with -direction. A variety of arrangements can be made, such as a lattice arrangement, a mesh arrangement, a twisted thread-like combination arrangement, and a laminated arrangement, but in this case as well, it is best to arrange the aggregate as a whole so that it is not biased. It is advantageous to gain. Furthermore, if the wettability of these fibers mainly made of SiC and metal material powder particles is poor, a metal, alloy, compound, etc. that has good wettability with the metal material may be applied to the fiber surface in advance by vapor deposition, plating, coating, or spraying. It is also possible to use a material coated by a method or the like.

Furthermore, in the present invention, in order to obtain a dense sintered body, a mixed powder of metal material powder and an organosilicon polymer compound or an aggregate in which short fibers are arranged in the mixed powder is prepared in advance. An aggregate of powder particles obtained by preheating at 400°C or less in a non-oxidizing atmosphere to once bring the organic compound into a molten state, evenly covering the surface of the metal powder particles, and then cooling it. The particle size can also be adjusted after the powder is pulverized using a crusher such as a crusher.

As described above, one of the features of the present invention is that the additive can be uniformly dispersed at a low temperature at which sintering of metal powder particles does not occur. Here, regarding the amount of the organosilicon polymer compound added, the range of the amount added is 0.05 to 30
Department. If it is less than 0.05 parts, the effect of addition is not sufficient and it is difficult to obtain a sintered body with excellent heat resistance. If it is more than 30 parts, there are too many decomposed and volatile components from organic compounds, so This is because there are too many voids, making it virtually unusable.

Therefore, in the above-mentioned addition range, when the amount added is increased, a porous sintered body can be obtained, and when the amount added is decreased, a dense sintered body can be obtained. As described above, according to the method of the present invention, it is possible to arbitrarily obtain a sintered body ranging from a dense sintered body to a porous sintered body by adjusting the amount of the organosilicon polymer compound added. Next, the amount of ceramic fiber added is 2 to 40 parts per 100 parts of metal material powder. If it is less than 2 parts, the effect of adding fibers will be poor and it will be difficult to improve the strength, and if it is more than 40 parts, the toughness of the composite sintered body will decrease, so it is necessary to keep it within the range of 2 to 40 parts.

Next, a method of pressure molding a mixture of metal material powder and an organosilicon polymer compound, or an aggregate in which fibers are arranged in the mixture, will be described.

First, the pressure molding of the mixture is carried out by a mechanical press method, a centrifugal press method, an extrusion method, an isostatic press method, a high temperature press method (hot press method), etc., which are usually used in powder metallurgy. However, in order to pressure-form an aggregate containing fibers, in addition to the above-mentioned methods, diffusion bonding (foil metallurgy), rolling, An infiltration method (which can also include a step of pressurizing with a gas body after infiltration) after the material is in a molten state or a gel state can be used. Among the above-mentioned pressurizing methods, although heating is required, the atmosphere, heating temperature, and other conditions are almost the same as those of the sintering method described later. The molded product obtained by the various pressure molding methods described above is heated in vacuum with any one selected from inert gas, hydrogen gas, CO gas, CO2 gas, ammonia gas, hydrocarbon gas, and organic compound gas. A heat-resistant composite sintered body can be obtained by heating in one or more non-oxidizing atmospheres. The heating temperature is in a temperature range of 800 to 1500°C. The reason is that at temperatures lower than 800°C, the decomposition of organosilicon polymer compounds and the accompanying formation of metal silicides, metal carbides, and even SiC microcrystals are insufficient, making it difficult to obtain products with excellent heat resistance. Further, since important reactions and bonds have already been sufficiently achieved by heating up to 1500°C, heating at temperatures higher than 1500°C is rather economically disadvantageous. The optimum heating temperature varies depending on the type and composition ratio of the metal material powder particles. In addition, the heating temperature increase rate is 10
It is appropriate to carry out the process at a rate of 0°C/hour or less. Raising the temperature at a rate higher than this rate will cause rapid decomposition of the organosilicon polymer compound and a rapid reaction between the products of the decomposition and the metal material. This is undesirable because it tends to cause the sintered body to lose its shape or crack. If the sintering atmosphere is oxidized, the metal material powder and the organosilicon polymer compound will be oxidized, so it is necessary to use a non-oxidizing atmosphere. However, once the material has been sintered at around 1000℃, the three necessary chemical changes and initial sintering are almost complete, so there is no problem even if oxidizing gas of about 10 mHg is mixed in the atmosphere. . Further, depending on the type of atmosphere during the sintering, a small amount of reaction products may be produced due to reaction with the atmospheric gas, but this is acceptable as long as it does not have a significant adverse effect on the properties of the sintered body 5. Furthermore, when using heating methods that apply pressure at high temperatures, such as the hot pressing method, diffusion bonding method, rolling method, and infiltration method mentioned above, the molds and containers used to maintain the press-formed product are also sintered during the heating process. Materials must be selected that do not have a significant negative effect on the four physical properties of the body. Next, chemical changes and the like that occur in the molded body during the heating process using the heating method described above will be described.

The decomposition of organosilicon polymer compounds already begins at temperatures below 500°C, but the reaction between the metal material powder and the free carbon and silicon produced by the decomposition starts gradually from a relatively low temperature of about 500°C. At around 1000° C., in conjunction with grain growth due to sintering of the metal powder particles, the carbon and silicon liberated by the decomposition form a solid solution phase with the metal phase, metal carbide, and metal silicide. Furthermore, unreacted carbon and silicon combine to form fine particles of mainly β-type silicon carbide (SiC). During this time, organic components that do not participate in the reaction are volatilized. As a result of heating, the sintered body mainly contains grown grains of a metal material containing a solid solution phase, metal carbides, metal silicides, and SiC fine particles. However, depending on the type of metal material powder, there are some that easily form carbides, some that easily form silicides, and some that are difficult to form both.
The abundance ratio of these compounds varies depending on the type and composition ratio of the metal material used. Furthermore, these metals, silicides or carbides, and these compounds and SiC fine particles form strong bonds with each other due to the effects of the above-mentioned decomposition of the organic compound and the combination process of the decomposition products. The strength is excellent. Furthermore, since the above-mentioned chemical change occurs uniformly in any part of the molded body, it is a great feature of the present invention that a sintered body having uniform properties throughout the body can be obtained. The above process is almost completed at 1500°C, and as a result, a sintered body is formed in which carbides and silicides cover the grown grains of metal material containing a solid solution phase, and this is tightly bonded with SiC fine particles. It turns out. In addition, in the case of composite fibers made of ceramics, the wettability with the metal material powder improves due to the action of free carbon and organic groups contained in the organic compound decomposition product, and a carbide formation reaction occurs. Since the bond between the fibers and the matrix becomes strong, a fiber composite with sufficiently high strength can be obtained. Thus, the composite sintered body according to the present invention has extremely high heat resistance due to the inclusion of metal carbide, metal silicide, SiC fine particles, etc., which have excellent heat resistance, ie, mechanical strength at high temperatures, oxidation resistance, corrosion resistance, and wear resistance. The result is a sintered body with excellent properties. As described above, when the amount of the organosilicon polymer compound used as an additive is increased, a porous sintered body can be obtained due to scattering of organic groups.

Therefore, as an application of the present invention, these porous sintered bodies can be subjected to the following treatment to form a new sintered compact. (1) After making the organosilicon polymer compound and/or metal material used in the present invention into a low-viscosity liquid state, the porous sintered body is impregnated or infiltrated under normal pressure or reduced pressure. , After increasing the degree of impregnation or infiltration by applying pressure if necessary, the same heat treatment as described above is performed to obtain a molded article with higher density and better performance.

(2) After pulverizing the porous sintered body and adjusting its particle size, after adding organosilicon polymer compound and/or metal material powder as necessary, pressure molding is performed in the same manner as described above. By heating and sintering, a molded product with higher density and better performance can be made.

However, it is disadvantageous to apply the process (2) to a sintered body using long fibers of 5 m or more.

Further, the treatments (1) and (2) can be applied to a porous sintered body that has not yet been sufficiently sintered. In order to make the organosilicon polymer compound into a liquid state for the purpose of the impregnation treatment in (1) above, it is sufficient to use a solvent that can dissolve it or to heat it to around 300°C. Further, in order to make the metal material into a liquid state, it is sufficient to heat the metal material to a temperature higher than its melting point. The processing of (1) and (2) above is
This can be repeated as many times as necessary. However, if the porous sintered body is used as it is, for example as an oil-impregnated bearing, the above treatments (1) and (2) may not be performed. Furthermore, the composite sintered bodies obtained by the above-mentioned methods, especially those containing iron, are subjected to performance improvement treatments such as carburizing, quenching, and tempering that are normally applied to metal-based sintered bodies. It can also be applied to Also,
After coating or spraying an organosilicon polymer compound on the surface of the obtained sintered body, heat treatment can increase the hardness of the surface layer and improve oxidation resistance, abrasion resistance, and corrosion resistance. can be measured. Next, the present invention will be explained with reference to examples.

Example 1 Fe-13Cr with purity of 99% or more and 350 mesh or less
A solution prepared by dissolving 10% by weight of polycarbosilane (average molecular weight 1000), which is a type of organosilicon polymer compound, in n-hexane was added to the alloy powder, and wet-mixed using a crusher.

This was dried using dry air and adjusted to a particle size of 200 mesh or less using a crusher again. This powder was hot pressed. The heating conditions were a graphite jig, 20
The temperature was increased to 1100° C. for 30 minutes at a heating rate of 300° C./Hr in an argon stream under a pressure of 0 Kf/Cd. Table 3 shows a comparison of the properties of this product and the metal sintered body made only of Fe-13Cr. As shown in the table above, the composite sintered body according to the present invention is superior to conventional metal sintered bodies, but
In particular, significant improvements were seen in hardness and oxidation resistance.

Figure AVC shows a photograph of the microstructure of the sintered body according to the present invention, and Figure BVC shows that of a conventional product (×1000). From the photographs, it can be seen that in the present invention, fine grains of carbides and silicides uniformly surround Fe-Cr alloy grains,
It can be seen that the presence of these compounds improved the hardness and oxidation resistance. Thus, it was confirmed that the composite sintered body according to the present invention can sufficiently withstand use at high temperatures. Example 2 A mixture of Höganäs iron powder with a purity of 98 to 99% and 200 meshes or less and copper powder with a purity of 99% and 200 meshes or less in a weight ratio of 90:8 was added with an organosilicon content of 2% by weight. A solution of polycarbosilane, which is one type of molecular compound, dissolved in n-hexane was added and wet-mixed using a crusher.

After drying this using dry air and adjusting the particle size to 200 mesh or less using a crusher again, as shown in the table above, the composite sintered body according to the present invention has particularly high stress resistance and oxidation resistance at high temperatures. Because it has excellent properties such as hardness and corrosion resistance, it is expected that its range of use will be greatly expanded as high-temperature mechanical parts. Example 3 1% by weight of polycarbosilane was added to a mixture of the iron powder used in Example 2 and Cr powder with a purity of 98.596 at a weight ratio of 94:5, and the mixture was prepared as in Example 1. In the same process 2
A mixed powder having a mesh size of 0.00 mesh or less was obtained.

This material was placed in a mold press mold with fibers mainly made of SiC (length 40Wr1n, thickness 10%) corresponding to 10% by volume.
~20 μm) are evenly distributed in one direction, and 50! /
A pressure molded body of 10×10×40 m11 was obtained by applying pressure of Cd. This was heated in a hydrogen stream at a temperature increase rate of 200°C/hour, and heated to 1300°C using a one-mold press for approximately 3 tons.
Apply a pressure of 0n/Cd, 5 x 10 x 40 m! A pressure-molded body of 1 was obtained. This was heated at 300℃/in a hydrogen stream.
Sintering was performed at 1200° C. for 1 hour at a heating rate of The properties of this material and the Fe-
Table 4 shows a comparison with the properties of a metal sintered body made of 8Cu-1.5C. As shown in the above table, the composite sintered body according to the present invention was found to have superior properties compared to conventional metal sintered bodies.

In addition, the various properties at high temperatures of the product of the present invention were compared with those of the conventional TiC product.
Table 5 shows a comparison with a cermet made of -24Ni-5C0-5Cr. The oxidation resistance and corrosion resistance at high temperatures were excellent, similar to those of the products in Examples 1 and 2, but especially the high temperature tensile strength was 800°C.
5K9/Fllj, demonstrating the usefulness of the product of this example at high temperatures.

Example 4 200 mesh Ni, Cu, Nn, Fe and Si powders with a purity of 99% were prepared at 62, 27, 2.1 and -0, respectively.
．． Polycarbosilane corresponding to 8% by weight was added to the mixture at a ratio of 8% and 0.1% by weight, and the same treatment as in Example 2 was carried out to form a molded product under pressure of 1t0n/Cd. Sintering was performed at 1100° C. for 1 hour in an argon atmosphere.

The obtained composite sintered body and the conventional product Ni-30Cu
- Table 7 shows a comparison of properties with a metal sintered body made of 2.1Mn-0.8Fe-0.1Si. This material has a theoretical density of approximately 85 cm, and is ground to a particle size of 250 cm.
The molded body was adjusted to a mesh size or less, and further 1% by weight of polycarbosilane was added to produce a molded body under pressure of 2t0n/Cwi, which was re-sintered at 1200°C for 1 hour in an argon atmosphere.

The properties of this material are density 8.2y/Crll, hardness H
v=340, tensile strength 86.5Kv/1, porosity 6.8
It was found that the properties were improved by resintering by crushing. Example 5 Pre-alloyed Cu-5Sn bearing alloy powder of 200 mesh or less was added to 98% by weight of polycarbosilane in an amount of 2% by weight at 5t0n/Cw.
It was molded into a cylindrical shape under a pressure of 150 m and sintered at 850° C. for 1 hour in a hydrogen stream.

Table 8 shows the properties of this bearing sintered body and the conventional product Cu-5Sn. As shown in the above table, according to the method of the present invention, a sintered body for bearings having a high oil content and high radial crushing strength can be obtained.

Note that the above examples are merely a few examples of methods for producing heat-resistant composite sintered bodies using metal material powder, which is a raw material for typical metal sintered bodies conventionally used. ,
Heat-resistant composite materials exhibiting excellent performance can also be produced using various other systems.

As described above, according to the present invention, it is possible to provide a method for manufacturing a composite sintered body having excellent mechanical properties, oxidation resistance, wear resistance, and corrosion resistance even at high temperatures. The aggregate is high temperature mechanical parts, high temperature friction parts,
It is expected that it will exhibit sufficiently excellent performance in a wide range of fields, including as bearings and as various heat-resistant materials.

[Brief explanation of the drawing]

Figure A is a microscopic micrograph of the sintered body of the present invention made from Fe-13Cr alloy powder and polycarbosilane (10% by weight) as raw materials, and Figure B is Fe-13Cr.
1 is a microscopic photograph of a conventional sintered body made of aluminum.

Claims (1)

[Claims] 1. 0 parts of an organosilicon polymer compound whose main skeleton components are carbon and silicon per 100 parts of metal material powder, which is conventionally used as a raw material for sintered machine parts, friction parts, and bearings.
．． After adding 05 to 30 parts to form a mixed powder, this is pressure-molded, and 800 to 30 parts is added in a non-oxidizing atmosphere.
A method for producing a heat-resistant composite sintered body, comprising a step of heating and sintering within a temperature range of 1500°C. 2. 0 parts of an organosilicon polymer compound whose main skeleton components are carbon and silicon per 100 parts of metal material powder, which is conventionally used as a raw material for sintered machine parts, friction parts, and bearings.
．． A process of disposing 2 to 40 parts of ceramic fibers into a mixed powder obtained by adding and mixing 05 to 30 parts to form an aggregate, and press-molding this aggregate; 1. A method for producing a heat-resistant composite sintered body reinforced with fibers, comprising a step of heating and sintering within a temperature range of 1500°C.