JPH07106951B2 - Carbon fiber reinforced carbon composite material and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a carbon fiber reinforced carbon composite material and a method for producing the same, and more specifically, carbonaceous fibers are used as a reinforcing fiber raw material, and pitch is used as a matrix raw material. It is produced by using a matrix raw material whose main component is a thermosetting resin or a mixture of an aromatic nitro compound and a thermosetting resin material comprising a curing agent and / or a curing accelerator added as necessary. And a high strength carbon fiber reinforced carbon composite material and a method for producing the same.

(Prior art) Carbon fiber reinforced carbon composite material (hereinafter "C / C composite")
Abbreviated) has excellent properties such as mechanical properties, heat resistance, corrosion resistance other than oxidation resistance, sliding properties, etc., and is a brake member, sliding member, structure for space aircraft, automobiles, various industrial machines, etc. It is useful because it has various uses such as materials. Further, due to expansion of fields of use or sophistication of technology in fields of use, it is desired to manufacture C / C composites with more excellent properties more economically.

Conventionally, carbonaceous fibers have been used as a reinforcing fiber raw material, and pitch or a thermosetting resin such as a phenol resin, an epoxy resin, a furan resin, a polyimide resin, or an unsaturated polyester resin has been used as a matrix raw material for a C / C composite. Is known (for example, JP-A-62-252371, JP-A-63-112463, JP-A-62-7256).
6, JP-A-1-160866, etc.). However, in the conventional method using pitch as a matrix raw material, although the carbonization yield of pitch is better than that of thermosetting resin, it is obtained due to the structure of pitch when fired.
There is a problem that the mechanical strength of the C / C composite is inferior, and the carbonization yield of the pitch is not yet sufficient, so it is necessary to repeat the impregnation treatment of the matrix raw material many times to obtain a dense C / C composite. There is a cost,
There is also the problem of not being economical. On the other hand, in the conventional method of using a thermosetting resin as the matrix raw material, when the mechanical strength of the C / C composite obtained due to the structure of the thermosetting resin when fired is used as the matrix raw material, pitch is used. Although it is better than, the carbonization yield of the thermosetting resin is low, and in order to obtain a dense C / C composite, it is necessary to repeat the impregnation treatment of the matrix raw material more times, resulting in higher costs, There is a problem that it is not economical, and there is also a problem that the mechanical strength of the resulting C / C composite is not yet sufficient. Further, conventionally, as a method for improving the method of using pitch or thermosetting resin as the matrix raw material, a method for producing a C / C composite using a mixture of pitch and thermosetting resin as the matrix raw material is also known. (For example, JP-A-62-72566 and JP-A-1-188468). However, even in the method for producing a C / C composite using this mixture of pitch and thermosetting resin as a matrix raw material, the respective characteristics of the pitch and thermosetting resin complement each other, resulting in a carbonization yield of the matrix raw material. C / is improved compared to the case where the thermosetting resin is used alone.
Although the mechanical strength of the C composite is improved compared to the case where the pitch is used alone and a corresponding improvement is made, the carbonization yield of the matrix raw material does not exceed that when the pitch is used alone, Also, the mechanical strength of the obtained C / C composite does not exceed that of the case where the thermosetting resin is used alone, and eventually the satisfactory carbonization yield of the matrix raw material can be economically satisfied with excellent mechanical strength, etc. C / C composite with characteristics cannot be obtained. Furthermore, in any of the above conventional methods, the moldability of the blend of the carbonaceous fiber and the matrix raw material is poor, and deformation occurs during firing for carbonization or graphitization of the molded article obtained by molding the blend, There is also a problem that it is difficult to obtain a suitably molded C / C composite.

(Problems to be Solved) An object of the present invention is to solve the problems of the conventional methods as described above, and to provide a C / C composite having characteristics such as more excellent mechanical strength with a higher carbonization yield of a matrix raw material. Therefore, it is to provide it in a molded state economically and preferably.

(Means for Solving the Problems) As a result of various studies to achieve the above object, the present inventors have found that the modification of the matrix raw material is extremely effective in solving the problems of the conventional method as described above. As a result of further inspiration and further research, a thermosetting resin material and an aromatic nitro compound, which consisted of a matrix raw material, pitch, a thermosetting resin, or a curing agent and / or a curing accelerator added as needed. In the three-component system, the carbonization yield of the matrix raw material is significantly improved, and a dense C / C composite can be obtained with a small number of impregnation treatments.
The mechanical strength of the C / C composite is remarkably improved, and the C / C composite with excellent properties which could not be achieved by the conventional method can be economically obtained. Furthermore, when such a ternary matrix raw material is used, carbon Moldability of the blend of the high quality fiber and the matrix raw material is improved, and the deformation of the molded article obtained by molding the blend is suppressed during firing, so that C /
The present invention has been completed by finding that a C composite can be obtained.

Accordingly, the gist of the present invention is, firstly, that a carbonaceous fiber is used as a reinforcing fiber raw material, and a pitch, a thermosetting resin as a matrix raw material, or a thermosetting resin system comprising the same and a curing agent and / or a curing accelerator thereof. There is a carbon fiber reinforced carbon composite material characterized by using a matrix raw material having a mixture of a material and an aromatic nitro compound as a main component, and secondly, carbonaceous fiber, pitch, thermosetting resin or the same. A mixture of a thermosetting resin material consisting of the curing agent and / or a curing accelerator and a matrix raw material containing a mixture of aromatic nitro compounds as a main component is mixed at room temperature to 600 ° C. at 0.1 to 400 kg. / molded at a pressure of cm ^2, carbonizing the molded product obtained at a temperature of 600 to 1500 ° C., the carbon fiber reinforced carbon, wherein the graphitizing the resulting carbonized product optionally It resides in the method of producing a composite material.

The carbonaceous fiber used as the reinforcing fiber raw material in the present invention may be any carbonaceous fiber, such as pitch-based, PAN-based or rayon-based, which can be used without any history of production. It may be a carbonized product or a graphitized product. Further, the shape thereof may be used without any question, and may be, for example, a short fiber, a long fiber, a woven fabric or a non-woven fabric, and may have a one-dimensional, two-dimensional or three-dimensional structure. good. Further, these carbonaceous fibers, even if the surface is surface-treated with a treating agent such as air, ozone, hydrogen peroxide solution, sizing agent,
It does not matter if it is not surface treated. Furthermore, among the shapes of the carbonaceous fibers, when the present invention is applied to the short fibers, the problems of the conventional method are remarkably improved. That is, in the conventional method, when short fibers are used, it is particularly difficult to obtain a dense C / C composite having a high fiber volume content and high mechanical strength, but according to the present invention, short fibers are reinforced fibers. As a result, a C / C composite having high density, high fiber volume content and high mechanical strength can be easily obtained.

As the pitch, which is one of the main constituents of the matrix raw material used in the present invention, the softening point is usually 100 to 400 ° C, preferably 200 to 350 ° C, and the volatile content up to 1000 ° C is 50% or less,
Preferably, lime pitch or petroleum pitch, which is 35% or less, is used. Further, this pitch may be either an optically isotropic pitch or an optically anisotropic pitch.

Various thermosetting resins such as phenol resin, epoxy resin, furan resin, polyimide resin and unsaturated polyester resin can be used as the thermosetting resin material which is another main constituent of the matrix raw material. . Among these, the phenol resin is preferably used because of its good effect, easy handling, and low cost. In addition, a curing agent and / or a curing accelerator is used in combination with these thermosetting resins, if necessary. That is, the thermosetting resin-based material is made of the above-mentioned various thermosetting resins, and if necessary, these various thermosetting resins and their curing agents and / or curing accelerators. Any thing can be used. The above phenolic resin has an average molecular weight of about 200 to 4
Approximately 000 resol-type or novolac-type initial condensates are preferable, and as the phenol resin, it is possible to use formaldehyde, paraformaldehyde, hexamethylenetetramine, and the like, which are generally used as a curing agent for the phenol resin, in combination. However, in the case of the novolac type, it is preferable to use such a curing agent in combination. As the epoxy resin, an initial condensate having an average molecular weight of about 900 to 4000 is preferable, and the epoxy resin is generally used as a curing agent for the epoxy resin such as diaminodiphenylsulfone, p-phenylenediamine and phthalic anhydride, if necessary. It can be used together. As the furan resin, an initial condensate having an average molecular weight of about 500 to 1000 is preferable, and the furan resin may be optionally used in combination with an acid catalyst generally used as a curing accelerator for the furan resin. As the polyimide resin, an initial condensate having an average molecular weight of about 2000 to 3000 is preferable, and it is usually unnecessary to use a curing agent together with the polyimide resin. The unsaturated polyester resin is preferably an initial condensate having an average molecular weight of about 1000 to 3000, and the unsaturated polyester resin is generally used as a curing agent for the unsaturated polyester resin such as vinyl type monomer such as styrene, if necessary. What is used can be used together. When a curing agent and / or a curing accelerator is used in combination, the amount of the curing agent and / or the curing accelerator generally used may be arbitrarily determined based on the amount used for curing the above various thermosetting resins as a guideline, if necessary. Usually, about 5 to 30 parts by weight is suitable for 100 parts by weight of the thermosetting resin.

The aromatic nitro compound, which is another main constituent of the matrix raw material, is one or more of nitrobenzene, nitroaniline, dinitrobenzene, nitronaphthalene, dinitronaphthalene, dinitroanthracene, trinitrobenzene, trinitrophenol, etc. A monocyclic or condensed-ring aromatic nitro compound having a nitro group is used. Among these, dinitrobenzene or dinitronaphthalene is preferably used because of its good effect, easy handling, and low cost. In the present invention, as a synergistic effect of using the above-mentioned pitch and thermosetting resin-based material as the matrix raw material in combination, and further adding such an aromatic nitro compound thereto, mechanical strength superior to that by the conventional method is obtained. C / C composite is obtained, and it is easily obtained economically in a good carbonization yield of the matrix raw material and in a suitably molded state.

As the matrix raw material used in the present invention, the above pitch, thermosetting resin material and aromatic nitro compound are usually used in the following proportions. That is, the pitch is 10 to 90 parts by weight, preferably 30 to 65 parts by weight, the thermosetting resin material is 10 to 90 parts by weight, preferably 15 to 45 parts by weight, the aromatic nitro compound is 1 to It is used in an amount of 45 parts by weight, preferably in the range of 15 to 35 parts by weight, and a total of 100 parts by weight. If the proportion of pitch used is less than 10 parts by weight or if the proportion of thermosetting resin material used exceeds 90 parts by weight, the denseness of the matrix phase will deteriorate, while if the proportion of pitch used exceeds 90 parts by weight. Alternatively, when the use ratio of the thermosetting resin-based material is less than 10 parts by weight, the adhesive force of the matrix phase to the carbon fiber is lowered, and in both cases, the strength of the C / C composite is lowered. If the amount of the aromatic nitro compound used is less than 1 part by weight, the effect of its addition cannot be expected. On the other hand, if it exceeds 45 parts by weight, the denseness of the matrix phase deteriorates, and in both cases high strength is achieved. C / C composite cannot be obtained.

Further, in the C / C composite of the present invention, the carbonaceous fiber as described above and the matrix raw material as described above, the carbonaceous fiber is usually 5 to 90 parts by weight, preferably 20 to 60 parts by weight, Matrix raw material is 10 to 95 parts by weight, preferably 40 to
It is used in a range of 80 parts by weight and a total of 100 parts by weight. If the proportion of carbonaceous fiber used is less than 5 parts by weight,
If the amount of the matrix raw material used exceeds 95 parts by weight, the reinforcing effect of the carbon fibers becomes insufficient and the strength of the C / C composite decreases, while the amount of carbonaceous fiber used exceeds 90 parts by weight. If the use ratio is less than 10 parts by weight, the amount of the matrix phase is too small, and its sufficient function cannot be expected, and the strength of the C / C composite is also reduced.

Further, in carrying out the present invention, carbonaceous powder such as carbon black, coke powder, and graphite powder may be added to the matrix raw material, if necessary. In this case, it is appropriate that the amount of carbonaceous powder to be added be up to 40% by weight of the total amount of pitch, the thermosetting resin material and the aromatic nitro compound, which are the main constituents of the matrix raw material.

The method for producing the C / C composite of the present invention will be described below. In producing the C / C composite of the present invention, the carbonaceous fibers, the pitch, the thermosetting resin-based material and the matrix raw material having an aromatic nitro compound as the main constituent components are usually mixed in the proportions as described above. , Blended into a blend. These compounding methods are arbitrary, and conventionally known compounding methods such as a wet method or a dry method can be widely adopted. However, when the carbonaceous fiber is a structure such as long fiber, woven fabric or nonwoven fabric, The wet method in which the matrix material is melted by heating or diluted with a solvent to impregnate the structure is preferable. In this case, a volatile solvent such as alcohol, acetone or tetrahydrofuran is suitable as the diluent solvent for the matrix raw material. Further, when the carbonaceous fiber is a filament of a long fiber, the filament may be passed through a matrix material obtained by heating and melting the filament to form a prepreg yarn. When the carbonaceous fiber is a short fiber, the matrix raw material is made into a fine powder by a pulverizing mixer such as a ball mill or a Hengel mixer together with a wet method in which the matrix raw material is melted by heating or diluted with a solvent and kneaded with the short fiber. A dry method in which the short fibers are mixed, or the matrix raw material is once melt-mixed to form an integrated body, which is cooled and then mixed with the short fibers as a fine powder in a pulverization mixer can be preferably used.

The mixture of the carbonaceous fiber and the matrix raw material is first molded. This molding method is arbitrary, and conventionally known molding methods and the like can be widely adopted. For example, in the case of adopting a molding method, the mixture is put in a mold, usually under a non-oxidizing gas atmosphere such as nitrogen or argon, at room temperature to 600 ° C.
Molding at a temperature of 0.1 to 400 kg / cm ² . When using a low molding temperature, it is also possible to mold under an air atmosphere. In the present invention, the moldability of the compound is good,
It is possible to obtain a molded product having a smooth surface without any damage or unevenness.

Next, the obtained molded product is carbonized. This carbonization is
Usually, in a non-oxidizing gas atmosphere such as nitrogen or argon, under normal pressure or pressure, 5 ℃ / min or less, preferably 2 ℃ / m
The temperature is raised at a heating rate of not more than in, and 600 to 1500 ° C, preferably 6
It is carried out at a temperature of 100 to 1000 ° C. If this carbonization is performed under pressure, a denser carbonized product can be obtained than under normal pressure. In the present invention, the addition effect of the aromatic nitro compound makes it possible to mold the mixture of the carbonaceous fiber and the matrix raw material at a relatively low temperature as compared with the conventional method, and to increase the heating rate during the carbonization of the molded product. Therefore, the energy cost of C / C composite production can be reduced, and the time required for the production can be shortened. That is, for example, in the case of producing a C / C composite containing short fibers as a reinforcing fiber at a high fiber volume content, in molding the compound, conventionally, a molding temperature of about 300 to 500 ° C. was required. Therefore, it can be molded at a molding temperature of about 200 to 300 ° C. In addition, when carbonizing a molded product, conventionally, if the heating rate is fast, the carbonized material will expand and become porous, so the heating rate will be 10 ° C / hr.
Although it was necessary to set the temperature to about (0.167 ° C./min), according to the present invention, the expansion of the carbonized product is suppressed even at a temperature rising rate of 1 to 5 ° C./min, and a dense carbonized product can be obtained. Further, in the present invention, when carbonizing the molded article, the deformation of the carbonized material is suppressed.

Carbonized product obtained by carbonizing the molded product as described above,
Compared with the carbonized product obtained by carbonizing the molded product by the conventional method, it is considerably dense and has mechanical strength, but in order to further increase its denseness and mechanical strength,
If necessary, pitch, or a mixture of a pitch and a thermosetting resin or a thermosetting resin-based material comprising the curing agent and / or a curing accelerator added as necessary to the carbonized product, or a pitch, Impregnating a thermosetting resin or a thermosetting resin-based material comprising a curing agent and / or a curing accelerator added as necessary with the thermosetting resin and an impregnating material such as a mixture of aromatic nitro compounds,
The resulting impregnated product is 600 to 1500 ° C, preferably 600 to 10
Carbonize at a temperature of 00 ° C. The series of operations of impregnation and carbonization may be repeated a plurality of times as necessary.
Further, the constituents of the pitch of the impregnating material, the mixture of pitch and thermosetting resin-based material, or the constituents of the mixture of pitch, thermosetting resin-based material and aromatic nitro compound are the same as those of the matrix raw material. Those described above are preferably used, and the proportion of each constituent component in the mixture is appropriately the same as the proportion in the matrix raw material. In the present invention, in general, even when short fibers are used as the reinforcing fibers in which the carbonized product is likely to become porous, a sufficiently dense carbonized product can be obtained by performing the series of operations of impregnation and carbonization once or twice. The number of times of performing the series of operations of impregnation and carbonization can be reduced as compared with the conventional method in order to obtain a carbonized product having an equivalent compactness.

In carrying out the present invention, a carbonized product obtained by carbonizing the above-mentioned molded product or a carbonized product obtained by performing a series of operations of impregnation and carbonization at least once is used as C /
Although it can be a C composite, if necessary, these carbonized products may be further added at 1800 to 3000 ° C, preferably 2000
Graphitized by firing at ~ 2700 ° C for even higher strength graphitized C / C
It is a composite.

(Effects of the Invention) According to the present invention, C / C using a pitch, a thermosetting resin, or a mixture thereof as a conventional matrix raw material
C / C composites are provided that are more dense and have better mechanical strength than the composite manufacturing method, which reduces the time required to carbonize the molded product and reduces the number of impregnation treatments compared to the conventional method. Economically in a short time
And, it is easily provided in a suitably molded state. More specifically, even if the impregnation treatment is carried out many times by the conventional method to obtain a C / C composite having the same degree of compactness as that of the present invention, the C / C composite having the same degree of compactness is obtained by the conventional method.
The mechanical strength of the C / C composite according to the present invention is superior to that of the C composite.

(Example) Below, the Example of this invention is described.

Examples 1, 2, 3 PAN-based carbon fibers (fiber length 6 mm, fiber diameter 7 μ, tensile strength 360 k
gf / mm ² , tensile modulus 24tonf / mm ² ) and isotropic pitch powder of coal (softening point 260 ℃, volatile content up to 1000 ℃ 28%) and novolac type phenol resin (Nippon Kayaku Co., average molecular weight 53)
0) Powder and hexamethylenetetramine powder (manufactured by Kanto Chemical Co., Inc.) and dinitronaphthalene (manufactured by Nippon Carlit Co., Ltd.)
Are mixed in a Henschel mixer at the ratio shown in Table 1 to give C /
Used as a C composite molding material.

The above forming raw material was put into a mold and hot press formed.
Hot press molding conditions are 3 ° C under a nitrogen gas flow atmosphere.
The temperature was raised at a heating rate of / min, a pressure of 300 kgf / cm ² was applied at 130 ° C, the temperature was raised to 500 ° C with the same pressure, and the temperature was maintained for 3 hours. After allowing the mold to cool, the molded body is demolded from the mold and 80 x 10 x 4 m
A molded body of m was obtained. The surface of the obtained molded product showed a resinous appearance and the moldability was extremely good. This molded body was heated in a coke powder under a nitrogen gas atmosphere to a temperature of 1 ° C./min at a temperature of 1000 ° C. to carbonize, thereby obtaining a C / C composite intermediate product. Neither swelling nor interlayer cracking was observed in this intermediate product. Table 2 shows the physical properties of the obtained C / C composite intermediate product.

Next, after impregnating the C / C composite intermediate product with a coal-based isotropic pitch (the same as that used at the time of molding) and carbonizing under the same conditions as the above-mentioned carbonization, the process was repeated twice, and then nitrogen gas flow was conducted. 40 ℃ / min up to 1000 ℃, 10 ℃ up to 2000 ℃ in an atmosphere
/ min, up to 2400 ℃ at a heating rate of 50 ℃ / min to 2400 ℃
The C / C composite was graphitized by holding for 0.5 hour. No deformation was observed in the C / C composite after graphitization. Table 3 shows the physical properties of the obtained C / C composite finished product.

Comparative Examples 1 and 2 Dinitronaphthalene was not included in the matrix raw material, the matrix raw material was prepared in the blending ratio shown in Table 1, and a C / C composite was prepared by the same method as in Example 1. The physical properties of the intermediate product and finished product are shown in Tables 2 and 3, respectively. still,
In Comparative Example 1, the densification step by pitch impregnation was repeated three times, and in Comparative Example 2, the same treatment was repeated twice. Further, in this case, peeling of the surface of the molded body was observed at the time of demolding after molding, volume expansion at the time of carbonization, and deformation after the graphitization treatment were observed.

Comparative Examples 3 and 4 Novolak type phenolic resin and hexamethylenetetramine as a curing agent were used as matrix raw materials at the time of molding.
Prepare the molding raw materials in the mixing ratios shown in the table and set the final molding temperature.
A C / C composite was prepared in the same manner as in Example 1 except that the temperature was 200 ° C. The physical properties of the intermediate and finished products are shown in Tables 2 and 3. In this case, a volume expansion of the molded body was observed during carbonization. In Comparative Example 3, the densification step by pitch impregnation was repeated four times, and in Comparative Example 4, the same treatment was repeated twice.

Example 4 Instead of the novolac type phenol resin, a polyimide resin (Kelimide (manufactured by Nippon Polyimide Co.): average molecular weight 200)
Example 1 except that 0) was mixed in the ratio shown in Table 1.
A C / C composite was prepared in the same manner as in. The physical properties of the intermediate product and finished product are shown in Tables 2 and 3, respectively. Similar to Example 1, these also had extremely good moldability, and neither deformation nor swelling during firing was observed at all.

Comparative Example 5 A molding raw material was prepared in the same manner as in Example 4 except that the matrix raw material did not contain dinitronaphthalene and the compounding ratio shown in Table 1 was used to prepare a C / C composite. The physical properties of the intermediate and finished products are shown in Tables 2 and 3. Also, in this case, peeling off the surface of the molded body at the time of demolding after molding,
In addition, volume expansion during carbonization and deformation after graphitization were observed.

Example 5 In the same manner as in Example 1 except that an epoxy resin (Epicoat: average molecular weight 900) was mixed with the matrix mixed resin and diaminodiphenyl sulfone (DDS) was mixed with the curing agent in the proportions shown in Table 1. A C / C composite was prepared. The physical properties of the intermediate product and finished product are shown in Tables 2 and 3, respectively. These also have very good moldability as in Example 1,
Neither deformation nor swelling during firing was observed at all.

Comparative Example 6 In Example 5, a molding raw material was prepared at a blending ratio shown in Table 1 without containing dinitronaphthalene in the matrix raw material, and an attempt was made to produce a C / C composite by the same method as in Example 1. In this case, it was impossible to produce a molded body.

Claims (5)

[Claims] 1. A carbonaceous fiber is used as a reinforcing fiber raw material,
The matrix raw material is characterized by using a pitch, a thermosetting resin, or a thermosetting resin-based material comprising the thermosetting resin and its curing agent and / or a curing accelerator and a mixture of an aromatic nitro compound as a main component. Carbon fiber reinforced carbon composite material. 2. The pitch, the thermosetting resin-based material and the aromatic nitro compound in the matrix raw material are used in such a ratio that the pitch is in the range of 10 to 90 parts by weight and the thermosetting resin-based material is in the range of 10 to 90.
In the range of parts by weight, the aromatic nitro compound is in the range of 1 to 45 parts by weight, and the total is 100 parts by weight, and the ratio of the carbonaceous fiber as the reinforcing fiber raw material and the matrix raw material used.
5 to 90 parts by weight of carbonaceous fiber, matrix raw material
The carbon fiber-reinforced carbon composite material according to claim 1, wherein the total amount is 100 parts by weight in the range of 10 to 95 parts by weight. 3. A matrix raw material containing carbonaceous fibers as a main component, which is a mixture of pitch, a thermosetting resin or a thermosetting resin material comprising the thermosetting resin and its curing agent and / or a curing accelerator, and an aromatic nitro compound. The compounded mixture is molded at a temperature of room temperature to 600 ° C and a pressure of 0.1 to 400 kg / cm ² , and the obtained molded product is carbonized at a temperature of 600 to 1500 ° C,
A method for producing a carbon fiber reinforced carbon composite material, which comprises graphitizing the carbonized material obtained as necessary. 4. A carbonized product obtained by carbonizing a molded product,
Pitch, a mixture of a pitch and a thermosetting resin or a thermosetting resin material comprising the same and a curing agent and / or a curing accelerator thereof, and a pitch, a thermosetting resin or a mixture thereof and a curing agent and / or a curing accelerator thereof An impregnation material selected from a mixture of a thermosetting resin material and an aromatic nitro compound is impregnated, and the resulting impregnated product is 600
At least one series of operations for carbonization at a temperature of ~ 1500 ° C
The method for producing a carbon fiber-reinforced carbon composite material according to claim 3, wherein the carbonized material is graphitized as necessary, after which the carbonized material is graphitized. 5. A blend comprising carbonaceous fibers and a matrix raw material, wherein the pitch, the thermosetting resin material and the aromatic nitro compound used in the matrix raw material are in the range of 10 to 90 parts by weight in the pitch. The thermosetting resin material is in the range of 10 to 90 parts by weight, the aromatic nitro compound is in the range of 1 to 45 parts by weight, and the total is 100 parts by weight. The use of carbonaceous fiber and matrix raw material The ratio is in the range of 5 to 90 parts by weight for the carbonaceous fiber and 10 to 10 for the matrix raw material.
The method for producing a carbon fiber-reinforced carbon composite material according to claim 3 or 4, wherein the total amount is 100 parts by weight in the range of 95 parts by weight.