JP2000344582A - Fiber/reinforced composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance strength, fracture toughness and fracture energy and to improve wear resistance and resistance to thermal impact by compositely dispersing non-oxide ceramic fibers into a matrix being a base layer and further incorporating a specific amount of diamond particles into the matrix. SOLUTION: A fiber reinforced composite material 1 having improved strength is obtained by compositely dispersing silicon carbide ceramic fibers 3 into a silicon carbide matrix 2 which is formed by, e.g. reaction-sintering. As the fibers 3, long fibers having diameters of 0.1 to 200 μm or short fibers are used, and the long fibers are arranged in the form of meshes or in parallel, and the short fibers are dispersed. The suitable volume percent of the fibers is not more than 65 vol.% based on the total volume. Further, the diamond particles 4 having high hardness, high thermal conductivity and low coefficient of thermal expansion and having an average particle size of 0.5 to 500 μm are incorporated into the matrix 2 in an amount of 0.1 to 90 wt.%. Furthermore, it is preferable to improve fracture toughness of the composite material 1 by allowing 3 to 30% residual silicon to exist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced composite material in which fibers are compounded and dispersed in a matrix as a base layer to increase the strength, and the fiber-reinforced composite material has improved wear resistance and thermal shock resistance. Related to composite materials.

[0002]

2. Description of the Related Art In general, ceramic sintered bodies are superior to metal materials in terms of wear resistance, heat resistance, high rigidity, corrosion resistance, light weight, and the like. For this reason, ceramic sintered bodies are used as electronic materials and structural materials such as heavy electrical equipment parts, aircraft parts, automobile parts, electronic parts, precision machine parts, and semiconductor device materials.

[0003] However, the ceramic sintered body is susceptible to tensile stress as compared with compressive stress, and in particular, has a defect of so-called brittleness in which the breakage proceeds at a stretch under this tensile stress. For this reason, in order to be able to apply the ceramic component to a portion where high reliability is required, it is strongly required to increase the toughness and increase the fracture energy of the ceramic sintered body.

[0004] In order to meet these demands, a fiber-reinforced composite material having an improved fracture toughness value is prepared by dispersing a composite material such as long fibers, short fibers or whiskers composed of an inorganic substance and a metal in a matrix. Research is being conducted at domestic and overseas research institutions.

[0005]

However, when such a fiber-reinforced composite material is applied to a sliding member in particular, satisfactory characteristics in terms of abrasion resistance are not obtained, and the fiber When the composite material is applied to other high-temperature structural members, there has been a problem that sufficient durability cannot be obtained in terms of thermal shock resistance.

The present invention has been made to solve such a problem, and has as its object to provide a fiber-reinforced composite material having improved wear resistance and thermal shock resistance.

[0007]

According to the first aspect of the present invention,
A fiber-reinforced composite material in which fibers are compounded and dispersed in a matrix serving as a base layer to improve the strength, wherein the matrix contains 0.1% by weight or more and 90% by weight or less of diamond particles. .

In the present invention, the friction coefficient is improved by incorporating diamond particles. Specifically, the content of the diamond particles in the matrix is set to 0.1.
Although it is specified that the content is 1% by weight or more and 90% by weight or less, when the content of the diamond particles is less than 0.1% by weight, the improvement of the wear resistance and the thermal shock resistance by the addition of the diamond particles is recognized. If the content of the diamond particles exceeds 90% by weight, sufficient composite material strength cannot be obtained.

The improvement in wear resistance due to the addition of diamond particles is mainly due to the extremely high hardness of the diamond particles. The improvement in thermal shock resistance due to the addition of diamond particles is due to the extremely high thermal conductivity and low coefficient of thermal expansion of the diamond particles.

According to a second aspect of the present invention, in the fiber reinforced composite material according to the first aspect, ceramic fibers are used as the fibers.

According to a third aspect of the present invention, in the fiber-reinforced composite material according to the second aspect, non-oxide ceramic fibers are used as the ceramic fibers.

The invention according to claim 4 is the invention according to claim 1 or 3.
The fiber-reinforced composite material described above is characterized in that silicon carbide-based ceramic fibers are used as the fibers.

In the second to fourth aspects of the present invention, it is preferable to use ceramic fibers as the fibers which are compositely dispersed in the fiber-reinforced composite material from the viewpoint of heat resistance and chemical stability. Considering the rigidity and the like, it is preferable to use non-oxide fibers. Also, in consideration of heat conduction characteristics, hardness, wear resistance and the like, silicon carbide ceramic fibers are most preferable. Specifically,
Silicon carbide ceramic fibers include high-purity silicon carbide fibers (SiC fibers), Si-CO fibers, and Si-Ti- fibers.
It includes CO fiber and SiC coated fiber (the core material is, for example, C) and the like, and contains silicon and carbon as main components.

According to a fifth aspect of the present invention, in the fiber reinforced composite material according to the fourth aspect, the fibers are long fibers.

[0015] As fibers to be compositely dispersed in the fiber-reinforced composite material, long fibers, short fibers, whiskers, or the like can be used. Particularly, in the present invention, the fibers are limited to the long fibers. Among these fibers, the long fibers have a large effect of suppressing the progress of cracks and a large effect of improving the toughness.

According to a sixth aspect of the present invention, in the fiber reinforced composite material according to any one of the first to fifth aspects, the diameter of the fiber is in a range of 0.1 μm to 200 μm. I do.

The diameter of the fiber greatly affects the strength characteristics of the composite material.
Whiskers and short fibers in the range of 1 μm to 200 μm, preferably long fibers (continuous fibers) may be used. If the diameter of the fiber is less than 0.1 μm, the reinforcing effect of the fiber is small, and if the diameter of the fiber exceeds 200 μm, problems such as cracking and reduction in product shape compatibility are mainly caused in terms of practicality. Because it will happen.

According to a seventh aspect of the present invention, in the fiber reinforced composite material according to any one of the first to sixth aspects, the fibers are blended in a proportion of 65% by volume or less of the whole. I do.

Regarding the mixing ratio of the fibers and the matrix, it is desirable to mix the fibers at a ratio of 65% by volume or less of the whole. If the added amount of the fibers exceeds 65% by volume of the whole, it becomes difficult to uniformly arrange the matrix around the fibers, and the strength characteristics of the composite material are significantly reduced. A particularly preferable mixing ratio of the fibers is in the range of 10% by volume to 50% by volume.

In some cases, the fiber may be provided with an appropriate interfacial coating in order to achieve an appropriate interfacial bonding strength with the matrix. If the interfacial bond strength between the fiber and the matrix is too low or too high, the effect of improving the toughness by the fiber will be small.

The fiber-reinforced composite material of the present invention is produced, for example, by the following steps. That is, a slurry is prepared by dispersing ceramic raw material powder and the like, and this slurry is formed into a preform formed of long fibers by a casting method (including a normal pressure forming method, a pressure forming method, a reduced pressure forming method, etc.). Impregnation filling is performed to produce a molded body having a predetermined shape. By using such a casting method, a molded article having a so-called near net shape close to the final product can be obtained. Next, the obtained molded body is placed in an inert gas such as a nitrogen gas or an argon gas or in a vacuum, for example, at 1400.
A composite sintered body is obtained by sintering at a temperature in the range of from 2000C to 2000C for about 1 hour to 10 hours.

According to an eighth aspect of the present invention, in the fiber reinforced composite material according to any one of the first to seventh aspects, the matrix is silicon carbide formed by a reaction sintering method. .

In the present invention, the fact that the matrix contains silicon carbide formed by reaction sintering is particularly limited.
As a method for forming a matrix containing diamond particles, it is preferable to use a so-called reaction sintering method in which molten silicon is permeated in a vacuum or a non-oxidizing atmosphere. In this case, a reaction layer of SiC is formed near the surface of the diamond particles due to the reaction between the diamond particles and the molten silicon. According to this method, a dense sintered body can be obtained without the need for high temperature and high pressure, and it is extremely practical in that relatively large members can be manufactured.

According to a ninth aspect of the present invention, in the fiber reinforced composite material according to the eighth aspect, 3% by weight is contained in the matrix.
It contains at least 30% by weight or less of residual silicon.

In the present invention, when the matrix is formed by the reaction sintering method, usually, unreacted residual silicon is present in the matrix. In particular, in the present invention, the amount of residual silicon is limited to 3% by weight or more and 30% by weight or less because if the amount of residual silicon is less than 3% by weight, sufficient composite material strength cannot be obtained.
If the amount is more than the percentage by weight, the toughness of the matrix is significantly reduced, and the properties as a composite material are also significantly reduced.

According to a tenth aspect of the present invention, in the fiber reinforced composite material according to any one of the first to ninth aspects, the average diameter of the diamond particles is 0.5 μm or more.
It is characterized by being not more than 00 μm.

If the average particle size of the diamond to be added is large, the diamond becomes a foreign substance and the strength is reduced.
If the average particle size of diamond is small, it will be burned out in the sintering process. In the present invention, the average particle diameter of the diamond particles is specified to be 0.5 μm or more and 500 μm or less.
If the average particle diameter is less than 500 μm, sufficient composite material strength cannot be obtained.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The fiber reinforced composite material of the present invention will be specifically described below with reference to FIGS.

First Embodiment (Table 1; FIG. 1) In the present embodiment, a fiber-reinforced composite material was prepared by woven and reinforced long fibers in a plain weave.

Examples (Samples No. 1 and No. 2) Fibers having a diameter of 14 μm were dispersed in the fiber-reinforced composite material.
m of silicon carbide long fiber (manufactured by Nippon Carbon Co., Ltd., trade name: Hynicalon). Then, the silicon carbide long fibers were woven, formed into a plain woven cloth, laminated, and set in a porous resin mold. At this time, the fiber content (V
f; Volume fraction of five
r) was 30%. Thereafter, the matrix raw material slurry was impregnated under pressure. As a matrix raw material slurry,
A ceramic raw material slurry in which a solid content of 55% by weight, pure water of 44% by weight, a dispersant and a binder of 1% by weight was mixed was used. Table 1 shows details of the solid content in the ceramic raw material slurry.

[0031]

[Table 1]

As shown in Table 1, the solid content was determined to have an average particle size of 3
μm silicon carbide powder 60% by weight, average particle size 0.03 μm
20% by weight of carbon black powder and an average particle size of 30
It consists of 20% by weight of a μm artificial diamond powder.

After the matrix raw material slurry was impregnated with pressure, it was molded and dried. Then, under the contact of silicon molten metal having a purity of 99.9 wt%, 1460
The mixture was heated in a vacuum at a temperature of 2 ° C. for 2 hours to produce a fiber-reinforced composite material by a reaction sintering method. This was designated as Sample No. It was set to 1.

Further, the amount of the artificial diamond powder was changed, 2 was produced.

As shown in Table 1, Sample No. The solid content of No. 2 consists of 16% by weight of silicon carbide powder having an average particle size of 3 μm, 4% by weight of carbon black powder having an average particle size of 0.03 μm, and 80% by weight of artificial diamond powder having an average particle size of 30 μm. Then, the sample No. A fiber-reinforced composite material was produced by a reaction sintering method in the same manner as in Example 1.

The thus obtained sample No. 1 and sample no. FIG. 1 shows a part of the structure of the fiber-reinforced composite material in FIG.

As shown in FIG. 1, the fiber-reinforced composite material 1
Has a silicon carbide matrix 2 as a base, and silicon carbide fibers 3 plain-woven in the silicon carbide matrix 2 are arranged in a mesh form. Diamond particles 4 and residual silicon 5 are dispersed in silicon carbide matrix 2.

Comparative Example (Samples No. 3 and No. 4) In this comparative example, the sample No. 3 was prepared in substantially the same manner as in the above-described embodiment. 3 and sample no. A fiber-reinforced composite material of No. 4 was produced.

Sample No. No. 3 did not add diamond particles. As the ceramic raw material slurry, a mixture obtained by mixing 52% by weight of solid content, 47% by weight of pure water, 1% by weight of a dispersant and a binder was used. Further, as shown in Table 1, this solid content had an average particle size of 3 μm.
70% by weight of silicon carbide powder and an average particle size of 0.03 μm
Of 30% by weight of carbon black powder.

On the other hand, the sample No. No. 4 added a large amount of artificial diamond. As the ceramic raw material slurry, a mixture of 52% by weight of solid content, 47% by weight of pure water, 1% by weight of a dispersant and a binder was used. And
As shown in Table 1, the solid content was composed of 4% by weight of silicon carbide powder having an average particle size of 3 μm, 1% by weight of carbon black powder having an average particle size of 0.03 μm, and 95% by weight of artificial diamond powder having an average particle size of 30 μm. Is done.

Next, the sample Nos. Of the Examples and Comparative Examples were used. 1
From Sample No. Specimens were cut out from up to 4 fiber reinforced composite materials and subjected to a wear resistance test and a thermal shock test. At this time, the abrasion resistance test was performed using an inertial abrasion tester of a type in which a rotated iron disk (material: SS400) was sandwiched from both sides by composite material pads. The test conditions for the wear resistance test were as follows: the surface pressure was 200 kg / c.
m ² and the speed were 1000 m / min. The thermal shock test was performed by holding a composite test piece having a size of 20 mm × 20 mm × 3 mm in a furnace at 1000 ° C. for 15 minutes, and then dropping it in water at room temperature.

As a result of the abrasion resistance test, in Examples,
The amount of wear by one test is 50 μm or less, and
As a result of the thermal shock test, the test piece after the test was sound without any cracks, both visually and microscopically.

Sample No. in Comparative Example In the case where the artificial diamond powder No. 3 was not added, in the wear resistance property test, the amount of wear in one test was 200 μm to 300 μm.
m. Further, in the thermal shock test, when the test piece after the test was observed, no cracks were visually observed, but many microcracks were observed by microscopic observation. On the other hand, sample No. When a large amount of the artificial diamond powder of No. 4 was added, in the wear resistance test, the amount of wear in one test was 100 μm to 200 μm, and in the thermal shock test, microcracks were generated, and Material strength could not be obtained.

Therefore, according to the present embodiment, the abrasion resistance and thermal shock resistance of the fiber-reinforced composite material are reduced by including the diamond particles in the matrix in the range of 0.1% by weight to 90% by weight. Can be improved.

Second Embodiment (FIG. 2) In this embodiment, a fiber-reinforced composite material having improved strength was produced by aligning fibers to form a unidirectional sheet material and then alternately laminating them.

Examples (Samples No. 5 and No. 6) Fibers having a diameter of 140 were dispersed in the fiber-reinforced composite material.
A μm silicon carbide long fiber (manufactured by Textron, USA, trade name: SCS-6, core material: carbon) was used. The silicon carbide long fibers were aligned and alternately laminated as a unidirectional sheet material, and then set in a porous resin mold. At this time, the fiber content Vf was 30%. Thereafter, the matrix raw material slurry was impregnated under pressure. As the matrix raw material slurry, a ceramic raw material slurry obtained by mixing 55% by weight of solid content, 44% by weight of pure water, 1% by weight of a dispersant and a binder was used. As shown in Table 1, the solid content in the ceramic raw material slurry was 60% by weight of silicon carbide powder having an average particle size of 3 μm, 20% by weight of carbon black powder having an average particle size of 0.03 μm, and artificial diamond powder having an average particle size of 30 μm. Consists of 20% by weight.

After the matrix raw material slurry was impregnated with pressure, it was molded and dried. After that, purity 9
1460 under contact of 9.9 wt% silicon molten metal
C. for 2 hours in a vacuum, and a fiber reinforced composite material was produced by a reaction sintering method. This was designated as Sample No. It was set to 5.

Further, by changing the amount of the artificial diamond powder added, No. 6 was produced.

As shown in Table 1, the sample No. The solid content of No. 6 is composed of 16% by weight of silicon carbide powder having an average particle size of 3 μm, 4% by weight of carbon black powder having an average particle size of 0.03 μm, and 80% by weight of artificial diamond powder having an average particle size of 30 μm. Then, the sample No. A fiber-reinforced composite material was produced by the reaction sintering method in the same manner as in No. 5.

The sample No. thus obtained was obtained. 5 and sample no. FIG. 2 shows a part of the structure of the fiber-reinforced composite material in FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 2, the fiber reinforced composite material 6
Has a silicon carbide matrix 7 as a base, and silicon carbide fibers 7 laminated in one direction on silicon carbide matrix 2. Then, diamond particles 4 and residual silicon 5 are dispersed in silicon carbide matrix 2.

Comparative Example (Samples No. 7 and No. 8) In this comparative example, the sample No. 7 was manufactured in substantially the same manner as in the above-described embodiment. 7 and sample no. No. 8 fiber reinforced composite material was produced.

Sample No. No. 7 did not add diamond particles. As the ceramic raw material slurry, a mixture obtained by mixing 52% by weight of solid content, 47% by weight of pure water, 1% by weight of a dispersant and a binder was used. Further, as shown in Table 1, this solid content had an average particle size of 3 μm.
70% by weight of silicon carbide powder and an average particle size of 0.03 μm
Of 30% by weight of carbon black powder.

On the other hand, the sample No. In No. 8, a large amount of artificial diamond was added. As the ceramic raw material slurry, a mixture obtained by mixing 52% by weight of solid content, 47% by weight of pure water, 1% by weight of a dispersant and a binder was used. Further, as shown in Table 1, this solid content had an average particle size of 3 μm.
4% by weight of silicon carbide powder, 1% by weight of carbon black powder having an average particle size of 0.03 μm, and 95% by weight of artificial diamond powder having an average particle size of 30 μm.

The sample Nos. Of the obtained Examples and Comparative Examples were used.
5 to Sample No. Abrasion resistance tests and thermal shock tests were performed on test specimens cut out of the composite materials up to 8. The test conditions of the wear resistance test and the thermal shock test are the same as in the first embodiment.

In the sample No. of the embodiment, 5 and sample no. 6
As a result of the abrasion resistance test, the amount of abrasion in one test was 50 μm or less. In addition, as a result of the thermal shock test, the test piece after the test was sound without any cracks, both visually and microscopically.

On the other hand, Sample No. of Comparative Example 7 and sample N
o. In No. 8, as a result of the abrasion resistance test, the amount of abrasion in one test was from 200 μm to 300 μm. Further, as a result of the thermal shock test, when the test piece after the test was observed, no cracks were visually observed, but a large number of microcracks were observed under a microscope.

Therefore, according to the present embodiment, even when long fibers are aligned and alternately laminated as a unidirectional sheet material, the diamond particles are contained in the matrix in the range of 0.1% by weight or more and 95% by weight or less. By doing so, the wear resistance and thermal shock resistance of the fiber reinforced composite material can be improved.

Third Embodiment (FIG. 3) In this embodiment, a fiber-reinforced composite material in which short fibers are compound-dispersed was produced.

Example (Samples No. 9 and No. 10) In this example, as a fiber composite-dispersed in a fiber-reinforced composite material, a silicon carbide-based short fiber having a diameter of 14 μm and a length of 1 mm (manufactured by Nippon Carbon Co., Ltd.) (Trade name: Hynicalon).

First, a ceramic raw material slurry containing the short fibers was prepared, and the ceramic raw material slurry was poured into a porous resin forming die, followed by pressure casting. This matrix raw material slurry is obtained by mixing 55% by weight of solid content, 44% by weight of pure water, and 1% by weight of a dispersant and a binder. Here, as shown in Table 1, the solid content is 30% by weight of silicon carbide powder having an average particle size of 3 μm,
It is composed of 20% by weight of carbon black powder having an average particle size of 0.03 μm, 20% by weight of artificial diamond powder having an average particle size of 30 μm, and 30% by weight of silicon carbide based short fibers.

After the matrix raw material slurry was impregnated with pressure, it was molded and dried. After that, purity 9
1460 under contact of 9.9 wt% silicon molten metal
C. for 2 hours in a vacuum to produce a fiber reinforced composite material by a reaction sintering method. This was designated as Sample No. It was set to 9.

A fiber reinforced composite material was prepared by changing the amount of the artificial diamond powder to be added. 1
0 was set. As shown in Table 1, the sample No. The solid content of No. 10 is composed of 16% by weight of silicon carbide powder having an average particle size of 3 μm, 4% by weight of carbon black powder having an average particle size of 0.03 μm, and 90% by weight of artificial diamond powder having an average particle size of 30 μm. Then, the sample No. A fiber-reinforced composite material was produced by a reaction sintering method in the same manner as in No. 9.

Comparative Example (Samples No. 11 and No. 12) In this comparative example, sample Nos. 11 and sample no. Twelve fiber reinforced composite materials were made.

In this comparative example, a fiber-reinforced composite material was produced in exactly the same manner as in the example except that no diamond particles were added.

Sample No. In 11, the ceramic raw material slurry contains 40% by weight of silicon carbide powder having an average particle size of 3 μm,
30% by weight of carbon black powder having an average particle size of 0.03 μm and 30% by weight of silicon carbide based short fibers were used as solids, and 54% by weight of solids, 45% by weight of pure water, and 1% by weight of a dispersant and a binder were mixed. Things.

On the other hand, the sample No. In No. 12, a large amount of artificial diamond was added. As the ceramic raw material slurry, a mixture obtained by mixing 52% by weight of solid content, 47% by weight of pure water, 1% by weight of a dispersant and a binder was used.
Further, as shown in Table 1, this solid content had an average particle size of 3 μm.
m, 4% by weight of silicon carbide powder, 1% by weight of carbon black powder having an average particle size of 0.03 μm, and 95% by weight of artificial diamond powder having an average particle size of 10 μm.

FIG. 3 shows a partial structure of the fiber-reinforced composite material obtained in this manner. The same parts as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 3, the fiber-reinforced composite material 8
Short fibers 9 are arranged on the silicon carbide matrix 2 based on the silicon carbide matrix 2. Further, diamond particles 4 and residual silicon 5 are dispersed in silicon carbide matrix 2.

The sample Nos. Of the obtained Examples and Comparative Examples were used.
9 to sample no. Specimens were cut out from up to 12 composite materials and subjected to a wear resistance test and a thermal shock test.
The test conditions for the wear resistance test and the thermal shock test were as follows:
This is the same as the first embodiment.

In the sample No. of the embodiment, 9 and sample no. 1
At 0, as a result of the abrasion resistance test, the amount of abrasion in one test was 50 μm or less. Also, as a result of the thermal shock test,
The test piece after the test was sound without any cracks observed both visually and under a microscope.

Sample No. of Comparative Example 11 and sample no.
In No. 12, as a result of the abrasion resistance test, the amount of abrasion in one test was from 200 μm to 300 μm. Also, in the thermal shock test, when the test piece after the test was observed,
Although no cracks were visually observed, many microcracks were observed under a microscope.

Therefore, according to the present embodiment, even when the fibers to be conjugated and dispersed are short fibers, the diamond particles are contained in the matrix in the range of 0.1% by weight to 90% by weight, whereby the fiber is reinforced. Abrasion resistance and thermal shock resistance of the composite material can be improved.

[0074]

As described above, according to the fiber-reinforced composite material of the present invention, the hardness of the matrix can be remarkably increased by the presence of the diamond particles, and the wear resistance can be greatly improved. Can have a high thermal conductivity and a low thermal expansion coefficient, and can significantly improve thermal shock resistance.

[Brief description of the drawings]

FIG. 1 is a view showing a part of a structure of a fiber-reinforced composite material in which a long fiber is plainly woven and cross-dispersed in a composite manner according to a first embodiment of the present invention.

FIG. 2 is a view showing a partial structure of a fiber-reinforced composite material in which long fibers are aligned and alternately laminated as a unidirectional sheet material according to a second embodiment of the present invention.

FIG. 3 is a view showing a partial structure of a fiber-reinforced composite material in which short fibers are compositely dispersed according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber reinforced composite material 2 Silicon carbide matrix 3 Silicon carbide fiber 4 Diamond particles 5 Residual silicon 6 Fiber reinforced composite material 7 Silicon carbide fiber 8 Fiber reinforced composite material 9 Short fiber

Claims (10)

[Claims] 1. A fiber-reinforced composite material in which fibers are compounded and dispersed in a matrix to be a base layer to improve the strength, wherein the matrix contains 0.1% by weight or more and 90% by weight or less of diamond particles. A fiber-reinforced composite material, characterized in that: 2. The fiber-reinforced composite material according to claim 1, wherein ceramic fibers are used as the fibers. 3. The fiber-reinforced composite material according to claim 2, wherein a non-oxide ceramic fiber is used as the ceramic fiber. 4. The fiber-reinforced composite material according to claim 1, wherein a silicon carbide-based ceramic fiber is used as the fiber. 5. The fiber reinforced composite material according to claim 4, wherein the fiber is a long fiber. 6. The fiber-reinforced composite material according to claim 1, wherein the diameter of the fiber is 0.1.
A fiber-reinforced composite material having a range of 1 μm to 200 μm. 7. The fiber-reinforced composite material according to claim 1, wherein the fibers have a total weight of 65%.
A fiber-reinforced composite material which is blended at a ratio of not more than volume%. 8. The fiber reinforced composite material according to claim 1, wherein the matrix is silicon carbide formed by a reaction sintering method. 9. The fiber reinforced composite material according to claim 8, wherein the matrix contains 3% by weight or more and 30% by weight or less of residual silicon. 10. The fiber-reinforced composite material according to claim 1, wherein the average diameter of the diamond particles is 0.5 μm or more and 500 μm or less. .