JPH11292646A - Carbon-based sliding member and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a carbon-based member capable of stably exhibiting abrasion characteristics by forming a member containing ceramics comprising a carbon fiber-reinforced carbon composite material and silicon carbide or silicon nitride at a specific ratio, each formed of a continuous phase, leaving carbon fiber in uneroded state and having a specific whole porosity. SOLUTION: This carbon-based member comprises 50-90 wt.% carbon fiber- reinforced carbon composite material and 50-10 wt.% ceramics comprising silicon carbide or silicon nitride and has <=18 wt.% whole porosity. The carbon- based member is obtained by carbonizing a preform comprising a carbon fiber and a carbonaceous matrix or depositing carbon onto a preform of carbon fiber by chemical vapor depositing method to prepare carbon fiber-reinforced carbon composite material, impregnating an organosilicon compound into the composite material and heat-treating the impregnated material in an inert gas atmosphere. In the carbon fiber-reinforced carbon composite material, a volume ratio of carbon fiber is preferably about 20-50 based on total volumes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon-based sliding member and a method for manufacturing the same, and more particularly, to an aircraft made of carbon fiber reinforced carbon composite material (hereinafter referred to as "C / C composite") and ceramics. The present invention relates to a carbon-based sliding member particularly preferably used as a material for a brake disk and a pad of a racing vehicle, a railway vehicle, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, C / C composites, which have been developed as materials for space members, have been widely used as sliding members for disc brake devices in aircraft, racing vehicles, railway vehicles and the like. Since the C / C composite has a large heat capacity, is lightweight, and has excellent heat resistance, it can be said that the C / C composite is a sliding member particularly suitable for an aircraft requiring light weight.
On the other hand, recently, ceramic fiber reinforced ceramics (Japanese Patent Laid-Open No. 9-57050) comprising a matrix of ceramics such as silicon carbide and silicon nitride (hereinafter referred to as “non-silicon oxide ceramics”) and ceramic fibers, and C Use of a composite material composed of a C / C composite and ceramics as a material for a sliding member has been studied. As the latter composite material, a non-silicon oxide ceramics dispersed and added to a C / C composite, or a SiO gas There has been proposed, for example, one in which part or all of a C / C composite is converted into silicon carbide by heat treatment in an atmosphere (Japanese Patent Laid-Open No. 5-59350).

[0003]

However, a disc brake using a C / C composite as a sliding member has disadvantages in that the friction coefficient tends to change with temperature and the amount of wear is relatively large. In addition, the C / C composite is a carbon material and oxidizes when exposed to high temperatures in the air. Therefore, it is necessary to apply an antioxidant to a surface other than the friction surface, but the effect is not sufficient. .

[0004] On the other hand, the ceramic matrix composite material is suitable for a sliding member because it has a small amount of wear and a high coefficient of friction. However, the ceramic matrix is hard and difficult to machine, and a complicated material such as a brake disk is required. There is a problem that it takes too much man-hour and cost to process into a complicated shape and is not practical.

[0005] Further, in a composite material comprising a C / C composite and ceramics, since the ceramic phase is a dispersed phase, when used as a sliding member, the ceramic phase exposed on the surface is peeled off, grooving occurs, and the amount of wear is reduced. Increased,
There is a disadvantage that the strength is also reduced. Furthermore, a sliding member made of a composite material in which part or all of the C / C composite is converted into silicon carbide has a component ratio that changes between the surface and the inside, and the friction performance fluctuates as it is used. Had a problem and the workability was not good.

[0006] The present invention solves the above-mentioned problems, and can stably exhibit frictional characteristics, as well as oxidation resistance, abrasion resistance, impact resistance, thermal shock resistance, tensile strength characteristics, and the like.
Another object of the present invention is to provide a carbon-based sliding member having excellent compressive strength characteristics and easy machining, and a method for manufacturing the same.

[0007]

According to the present invention, there is provided a carbon-based sliding member comprising a ceramic comprising 50 to 90% by weight of a C / C composite and at least one of silicon carbide and silicon nitride.
50 to 10% by weight, wherein the C / C composite and the ceramic form a continuous phase, the carbon fibers remain in a non-eroded state, and the total porosity is 18% or less. Claim 1). According to the carbon-based sliding member, since the ratio of the C / C composite to the non-silicon oxide ceramic is within the above range, the non-silicon oxide ceramic easily forms a thin continuous phase.
When combined with the content of 10% by weight or more, oxidation resistance and wear resistance, which are characteristics of the non-silicon oxide ceramics, can be effectively exhibited, and friction characteristics can be stably exhibited. In addition, since the total porosity is 18% or less, peeling of the continuous phase of the non-silicon oxide ceramic is suppressed.
For this reason, it is possible to prevent the amount of wear from increasing due to the peeling and to prevent the compressive strength from decreasing. Furthermore, since the ratio of the C / C composite is 50% by weight or more, it is excellent in impact resistance and substantially C / C
Machinability equivalent to that of C composite can be ensured. In the internal structure of the carbon-based sliding member, the carbon phase substantially covers the periphery of the carbon fiber, and the internal gap and the periphery of the carbon phase are covered with non-silicon oxide ceramics. Further, the carbon fibers remain without being eroded by the non-silicon oxide ceramics. For this reason, the impact resistance and tensile strength, which are the characteristics of carbon fibers, can be exhibited more favorably. In addition, the machinability is good due to the carbon phase, and it has been confirmed that the machinability is more effectively improved as the thickness of the non-silicon oxide ceramic phase is smaller. Further, the carbon phase serves as a cushion, and the thermal shock resistance is also good.

[0008] The method for manufacturing a carbon-based sliding member according to the present invention is the method for manufacturing a carbon-based sliding member according to claim 1, wherein the preform comprising carbon fiber and carbonaceous matrix is carbonized. Alternatively, carbon is deposited on a carbon fiber preform by a chemical vapor deposition method (hereinafter, referred to as a “CVD method”) to produce a C / C composite.
A non-silicon oxide ceramic is produced in the / C composite (claim 2). According to this method of manufacturing a carbon-based sliding member, the C / C composite and the non-silicon oxide ceramic form a continuous phase, respectively, and the carbon fibers are substantially covered with the carbon phase. The remaining carbon-based sliding member can be easily and reliably obtained, and the thickness of the non-silicon oxide ceramic phase can be reduced. It is also possible to prevent non-silicon oxide ceramics from being unevenly distributed in the surface phase.

According to a second aspect of the present invention, in the method of manufacturing a carbon-based sliding member, the C / C composite is impregnated with an organosilicon compound, and heat-treated in an inert gas or nitrogen gas atmosphere to produce a non-silicon oxide ceramic. It may be generated (claim 3). According to the above manufacturing method, a carbon-based sliding member having stable quality can be obtained.

According to a second aspect of the present invention, in the method for manufacturing a carbon-based sliding member, the C / C composite is manufactured and then the C / C composite is manufactured.
The step of impregnating the composite with resin or pitch to carbonize it, or the step of depositing carbon by chemical vapor deposition and the step of producing non-silicon oxide ceramics may be performed at least once. Item 4). According to the above manufacturing method, the carbonized sliding member having a total porosity of 18% or less is easily formed by carbonizing the resin or pitch or depositing carbon, thereby densifying the intermediate as a blank for the carbon-based sliding member. Is obtained. In addition, since the density and the size of the pores become smaller due to the densification,
The thickness of the non-silicon oxide ceramic phase can be further reduced.

[0011]

Embodiments of the present invention will be described below in detail. The carbon-based sliding member according to the present invention is manufactured as follows. First, a C / C composite is prepared from a carbon fiber and a carbonaceous matrix. Carbon fiber is
There are many types of materials such as PAN (polyacrylonitrile) -based, pitch-based and rayon-based materials, shapes of long fibers and short fibers, and shapes of woven fabrics, non-woven fabrics, chopped fibers, and the like. It is appropriately selected according to the situation. Intermediate fibers such as flame-resistant fibers before carbonization, and blended or mixed products with other fibers can also be used. From the experimental results, it has been found that a nonwoven fabric is preferable for sliding member applications.

There are two methods for producing a C / C composite: a method in which carbon is deposited on the carbon fiber preform by a CVD method, and a method in which carbon fiber is preformed with a carbonaceous matrix and then carbonized. There is a way. In the former method of depositing carbon by the CVD method, a raw material gas (such as methane or propane gas) serving as a matrix and a carrier gas are introduced into a preform of the carbon fiber maintained at a constant temperature, and the pores thereof are formed. The carbon is deposited by a chemical reaction on the inner surface of the part. The latter method using a carbonaceous matrix is a thermosetting resin such as a phenol resin, a furan resin and a polyimide resin,
From among various carbonaceous matrices such as pitches such as coal tar pitch and petroleum pitch, a carbonaceous matrix is selected according to the use of the sliding member, and the carbon fiber is impregnated into carbon fibers to be cured and carbonized. . Impregnation with a carbonaceous matrix has less effect on friction properties than impregnation with non-silicon oxide ceramics. Powders such as carbon powder and graphite powder may be mixed therein. Molding is
Various techniques such as hot press molding and hand lay-up can be used, and several preforms may be stacked and integrated at the time of molding.

In the C / C composite according to the present invention, the ratio between the carbon fiber and the carbonaceous matrix is not limited, and the type (PAN type, pitch type, etc.) and form (woven cloth, non-woven cloth, chopped) of the carbon fiber to be used. Fiber, etc.), the material of the carbonaceous matrix (resin-based, pitch-based, CVD-based, etc.) and the required ratio are set in consideration of the required frictional characteristics and the like. From the viewpoint of maintaining the performance of the sliding member, the ratio of carbon fiber
It is preferable to set to about 50 volume ratio (to the whole).

The carbon-based sliding member of the present invention contributes to the method of manufacturing a C / C composite, the ratio of voids (void ratio), the size and uniformity of voids, and the production of non-silicon oxide ceramics. The final ratio of the non-silicon oxide ceramics is determined by the ratio of the closed pores that are not used, and the like, and the performance of the carbon-based sliding member is determined. Therefore, the combination of the raw material and the production method is selected so that the number of closed pores is small and fine pores are uniformly present. The porosity is obtained by impregnating the C / C composite with a thermosetting resin such as furan resin or pitches such as coal tar pitch.
Alternatively, it can be adjusted by depositing carbon by a CVD method. Either method has little effect on the friction characteristics.

Next, non-silicon oxide ceramics are formed in the pores and the surface phase of the C / C composite. The method includes the steps of: dissolving an organic silicon compound such as polysilazane and polycarbosilane in a solvent; After impregnating the C / C composite, it is fired at a temperature of 700 ° C. or more in an atmosphere of an inert gas such as argon or a nitrogen gas to generate non-silicon oxide ceramics by reaction. When silicon is nitrogen gas, silicon nitride is generated. Usually, this operation of impregnation and firing is repeated several times to produce a non-silicon oxide ceramic. The number of repetitions of the operation is determined by the required weight% of the non-silicon oxide ceramic and the final density. Further, infusibility treatment may be performed for the purpose of increasing the yield of silicon carbide. When the infusibilization treatment is performed, silicon oxide is generated as an impurity, but there is no problem if the amount is small. In addition, by-products such as carbon and hydrogen and impurities may be mixed due to the production method and raw materials, but even if mixed, the amount is very small and there is no problem. Also, C /
There is also a method of depositing non-silicon oxide ceramics on the C composite by the CVD method, but it takes considerable time and effort to remove the CVD phase on the surface, and it takes time to deposit it deeply.

The carbon-based sliding member is preferably composed of 50 to 90% by weight of a C / C composite and 50 to 10% by weight of a non-silicon oxide ceramic. When the ratio between the two is within the above range, the non-silicon oxide ceramics easily forms a thin continuous phase, and in combination with the fact that the ratio of the non-silicon oxide ceramics is 10% by weight or more, the oxidation resistance and the friction resistance are improved. The characteristics are improved. When the ratio of the C / C composite is 50% by weight or more, the machinability and the impact resistance are good. Then, within the above range, a suitable ratio may be selected according to the use of the friction material and the like.

In the method of manufacturing a carbon-based sliding member having the above structure, the non-silicon oxide ceramic is formed and then impregnated with a resin or pitch to carbonize the ceramic.
The step of depositing carbon by the VD method may be performed a plurality of times, and a step of forming a non-silicon oxide ceramic may be further added. After the C / C composite is produced, a step of impregnating resin or pitch to carbonize or depositing carbon by a CVD method and a step of producing a non-silicon oxide ceramic are repeated plural times in this order. You may. In any case, the intermediate as a blank of the carbon-based sliding member is densified and the porosity and the size of the vacancy are reduced, so that the continuous phase of the non-silicon oxide ceramic is effectively thinned, and The machinability and impact resistance of the sliding member are further improved.

In order to obtain a carbon-based sliding member having a total porosity of 18% or less only by the non-silicon oxide ceramic forming step without performing the resin or pitch impregnating step, etc. The process must be repeated many times, and as a result the continuous phase of the non-silicon oxide ceramics becomes thicker, but when the intermediate of the carbon-based sliding member is densified by performing the resin or pitch impregnation step or the like, A carbon-based sliding member having a total porosity of 18% or less can be easily obtained. Regarding the total porosity of the carbon-based sliding member, if this exceeds 18%,
Even if both components form a continuous phase, when a sliding test is performed,
Since the non-silicon oxide ceramic peels off and causes grooving, the wear amount is extremely increased. However, the total porosity is
When it is 18% or less, grooving does not occur, and the amount of wear is smaller than when the C / C composite is used alone. In addition, the total porosity is the true density of each component (measurement method is JIS
) And the weight ratio.

[0019]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to the examples. Example 1 A length of 6000 bundles of PAN (polyacrylonitrile) -based carbon fiber (Toray T300) having a diameter of 7 μm was measured.
The cut into 25 mm and the organic fiber of rayon were mixed at a weight ratio of 90:10, and this was mixed with a basis weight of 30 using a card machine.
A non-woven fabric of 0 g / m ² was obtained. This non-woven fabric is repeatedly laminated and punched to make a high-weight non-woven fabric with a basis weight of 10 kg / m ² , impregnated with a phenol resin solution (Showa BRL-2854) twice as much as the weight of the non-woven fabric, dried, and further heated. Hardened to 20mm at 170 ° C with a press and then 190
Post-curing was carried out at 300C and 210C for 3 hours each. The molded body thus obtained is placed in an inert atmosphere for 30 minutes.
10 ° C / Hr up to 0 ° C, 5 ° C / Hr for 300 to 600 ° C, 600 ° C
The above was carried out at a heating rate of 20 ° C./Hr and carbonized by raising the temperature to 1000 ° C. The bulk density after carbonization was 0.95 g / cm ³ .

Further, this sample was put in a graphitization furnace.
After graphitizing up to 2500 ° C, impregnating with xylene solution of polycarbosilane (Nihon Carbon Npsi Type S) and curing at 180 ° C. Hr, 300-700 ° C is 5 ° C / Hr,
Above 700 ° C, the temperature was raised to 1400 ° C at a rate of 20 ° C / Hr to produce silicon carbide. Further, the steps of impregnation, curing and silicon carbide generation were repeated four times to obtain a carbon / ceramic composite material.

Next, the carbon / ceramic composite material is impregnated with a coal tar pitch having a softening point of 120 ° C.
Up to 300 ° C, 50 ° C / Hr, above 300 ° C under the same conditions as above
The temperature was raised to 1000 ° C. to carbonize, and the steps of pitch impregnation and carbonization were repeated and fired at 1500 ° C. to obtain a carbon-based sliding member having a density of 2.1. The carbon-based sliding member had a silicon carbide content of 45% by weight and a porosity of 11%.

Example 2 Density of Example 1 0.95 g / cm^Three of
Sample impregnated with coal tar pitch with softening point 120 ° C
Then, in the inert atmosphere, up to 300 ℃ 50 ℃ / H
r, above 300 ° C, raise the temperature to 1000 ° C under the same conditions as above.
Carbonized and further graphitized to 2500 ° C in a graphitizing furnace
1.25 g / cm^Three Sample was obtained. This sun
About pull, similarly to Example 1, polycarbosilane containing
Immersion, hardening and silicon carbide generation are performed twice, and the pitch
Repeat the immersion and carbonization process twice, firing at 1500 ℃
Was. In addition, polycarbosilane impregnation, hardening and silicon carbide
Perform the generation, density 1.76g / cm ^Three Of carbon-based sliding members
Was. The carbon-based sliding member contains 20% by weight of silicon carbide.
And the porosity was 18%.

Example 3 0.95 g / cm after carbonization in Example 1
Pitch impregnation and carbonization steps were performed on ^three samples.
This was repeated several times, and further graphitization treatment was performed up to 2500 ° C. in a graphitization furnace. The bulk density at this time was 1.57 g / cm ³ . Thereafter, polycarbosilane impregnation, curing and silicon nitride treatment in a nitrogen atmosphere were performed to obtain a carbon-based sliding member having a density of 1.78 g / cm ³ . The carbon-based sliding member had a silicon nitride content of 10% by weight, 2% by weight of silicon carbide, and a porosity of 15%.

Comparative Example 1 A sample having a bulk density of 1.25 g / cm ³ after pitch impregnation and graphitization in the middle of Example 2 was prepared.
Metallic silicon was impregnated and reacted at 1800 ° C. with the carbon material of the base material to obtain a carbon-based sliding member. The density of this carbon-based sliding member is
2.1 g / cm ³ , silicon carbide content of 58% by weight, porosity of 15
%Met.

[Comparative Example 2] The sample having a bulk density of 1.57 g / cm ³ after the graphitization treatment of Example 3 was subjected to CVD treatment with carbon to obtain a carbon-based slide of a C / C composite having a density of 1.75 g / cm ^3. A moving member was obtained. No silicon carbide was detected from this carbon-based sliding member, and the porosity was 12%.

Comparative Example 3 The sample of Example 1 was impregnated with polycarbosilane in the middle of the process, and was taken out at the stage where the silicon carbide forming process was completed, to obtain a carbon-based sliding member. The density of the carbon-based sliding member was 1.90 g / cm ³ , the content of silicon carbide was 50% by weight, and the porosity was 22%.

[Evaluation Test] The following six types of samples were subjected to the following evaluation tests (1) to (4). Table 1 shows the results of this evaluation test. (1) A cube having a side of 5 mm was formed, and a thermobalance test was performed under the conditions of a heating rate of 5 ° C./min and an air flow rate of 200 ml / min, and the temperature when the weight loss exceeded 5% was measured. (2) The processing time when processing a ring-shaped plate having an outer diameter of 150 mm, an inner diameter of 110 mm and a thickness of 10 mm was measured. (3) The ring-shaped plate was processed and dropped on a concrete ground from a height of 3 m to check for cracks. (4) The interface between the non-silicon oxide ceramic and carbon was observed with a polarizing microscope, and the presence or absence of erosion of silicon on carbon fibers was examined.

[0028]

[Table 1]

From the evaluation test results shown in Table 1, the C / C composite of Comparative Example 2 is inferior in oxidation resistance, whereas the other Examples and Comparative Examples have high oxidation temperatures and good oxidation resistance. It turns out. Comparative Example 1 in which the ratio of silicon carbide, which was impregnated with metal silicon and reacted and sintered, had a high ratio of silicon carbide, was poor in workability, and the processed plate was broken in a drop test. In the example, the workability was good, and it was found that the processed plate had a little chipped edge in the drop test, and was strong in impact.

Next, the six types of samples were machined to prepare two stators having an outer diameter of about 150 mm and a rotor having an outer diameter of about 130 mm, and a dynamo test was performed. Since the sample of Comparative Example 1 was poor in workability, it was machined in advance, silicon carbide was generated, and the work was performed again to obtain a test material. The test is pressing pressure 45
The test was carried out in five steps in the range of KPa and a speed of 30 to 150 km / s, and the amount of abrasion was measured after repeated 50 stop tests. Table 2 shows the results. Further, for Example 2, Comparative Example 1, and Comparative Example 2, changes in the instantaneous friction coefficient obtained by the dynamo test are shown in the graph of FIG.

[0031]

[Table 2]

From the above results, it is clear that Comparative Example 1 is inferior in strength characteristics and instantaneous friction coefficient, Comparative Example 2 is inferior in friction coefficient, Comparative Example 3 is inferior in abrasion resistance, and inferior to Examples. ,
It has been clarified that the carbon-based sliding material of the present invention has good friction characteristics, machinability, impact resistance and oxidation resistance as a sliding member.

FIG. 2 shows the result of observing the carbon-based sliding member of the present invention with a polarizing microscope. As shown in FIG. 2, the internal structure of the carbon-based sliding member of the present invention is such that the carbon phase 2 covers substantially the periphery of the carbon fiber 1, and the internal gap and the periphery of the carbon phase 2 are non-silicon oxide ceramics. Phase 3 is now covered. Further, the carbon fiber 1 remains without being eroded by the non-silicon oxide ceramic phase 3. Therefore, the impact resistance and tensile strength, which are the characteristics of the carbon fiber 1, can be favorably exhibited. In addition, the thermal shock resistance can be favorably exhibited by the carbon phase 2 serving as a cushion. The non-silicon oxide ceramic phase 3 has island-shaped holes 4.
Are distributed.

As described above, the carbon-based sliding member is made of C
Since the porosity, the size and uniformity of the vacancies, and the open porosity of the / C composite are suitable, the non-silicon oxide ceramics are not eroded to the carbon fibers, and are inserted into the narrow gaps of the carbon phase, as described above. A thin continuous phase is formed in the state of penetration and further in a state where the surface phase of the C / C composite is thinly covered in a layered manner, and the ratio thereof is suitable. Therefore, the properties of carbon materials and ceramics can be exhibited in a well-balanced manner, and the impact resistance, thermal shock resistance, oxidation resistance,
Various properties such as abrasion resistance, friction properties, tensile strength properties, compressive strength properties, and machinability can be exhibited well.

[0035]

The present invention configured as described above has the following effects. According to the carbon-based sliding member of the first aspect, the ratio between the C / C composite and the non-silicon oxide ceramic is such that the non-silicon oxide ceramic easily forms a thin continuous phase. Is 10% by weight or more, the oxidation resistance and the wear resistance, which are the characteristics of the non-silicon oxide ceramics, can be effectively exhibited, and the friction characteristics can be stably exhibited. In particular, the wear resistance is improved in combination with the fact that the total porosity is set to 18% or less and the continuous phase of the non-silicon oxide ceramic is suppressed from peeling. In addition, a decrease in compressive strength due to the separation is prevented. Since the ratio of the C / C composite is 50% by weight or more, the impact resistance is good and the machinability is almost equal to that of the C / C composite. Therefore, it is possible to machine a complicated shape including long hole machining such as a rotor-stator system and a disk pad system. Furthermore, since the carbon fibers remain without being eroded by the non-silicon oxide ceramics, the impact resistance and the tensile strength, which are the characteristics of the carbon fibers, can be further exhibited. In addition, the carbon phase serves as a cushion, and the thermal shock resistance is also improved. Therefore, the carbon-based sliding member of the present invention can be applied to brake discs, pads, and the like of aircraft, racing vehicles, and railway vehicles used under high-speed, high-load conditions.

According to the method for manufacturing a carbon-based sliding member according to the second aspect, the C / C composite and the non-silicon oxide ceramic each form a continuous phase, and the carbon fibers are substantially covered with the carbon phase. Further, the carbon-based sliding member remaining in a non-eroded state can be easily and reliably obtained, and the thickness of the non-silicon oxide ceramic phase can be reduced. In addition, since the non-silicon oxide ceramics can be prevented from being unevenly distributed in the surface phase, there is no possibility that the friction coefficient changes with use, and the friction characteristics can be more stably exhibited.

According to the method for manufacturing a carbon-based sliding member according to the third aspect, a carbon-based sliding member having stable quality can be obtained.

According to the method for manufacturing a carbon-based sliding member according to the fourth aspect, the intermediate is densified by carbonization of the resin or pitch or the deposition of carbon, and the carbon-based sliding member having a total porosity of 18% or less. Can be easily obtained. In addition, the densification reduces the porosity and the size of the vacancies, so that the thickness of the non-silicon oxide ceramic phase can be further reduced.
Therefore, the machinability is more effectively improved.

[Brief description of the drawings]

FIG. 1 is a graph showing changes in the instantaneous friction coefficient of an example and a comparative example.

FIG. 2 is a schematic diagram showing the results of observing the carbon-based sliding member of the present invention with a polarizing microscope.

[Explanation of symbols]

 Reference Signs List 1 carbon fiber 2 carbon phase 3 non-silicon oxide ceramic phase 4 vacancy

Claims (4)

[Claims] 1. A carbon fiber reinforced carbon composite material containing 50 to 90% by weight and a ceramic comprising at least one of silicon carbide and silicon nitride of 50 to 10% by weight. A carbon-based sliding member having carbon fibers remaining in a non-eroded state and having a total porosity of 18% or less. 2. The method for producing a carbon-based sliding member according to claim 1, wherein a preform comprising carbon fibers and a carbonaceous matrix is carbonized, or chemical vapor deposition is performed on the carbon fiber preform. A method for producing a carbon-based sliding member, comprising: depositing carbon by a method to produce a carbon fiber reinforced carbon composite material; and forming the ceramic in the carbon fiber reinforced carbon composite material. 3. The carbon-based sliding member according to claim 2, wherein said carbon fiber reinforced carbon composite material is impregnated with an organic silicon compound and heat-treated in an inert gas or nitrogen gas atmosphere to produce said ceramics. Manufacturing method. And a step of impregnating the carbon fiber reinforced carbon composite material with a resin or pitch and carbonizing the carbon fiber reinforced carbon composite material, or depositing carbon by a chemical vapor deposition method. 3. The method for producing a carbon-based sliding member according to claim 2, wherein the step of forming the ceramic is performed at least once.