KR20100131668A - Carbon composite, manufacturing method thereof, disk for clutch, and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A carbon composite, a producing method thereof, a disc for a clutch using thereof, and a manufacturing method thereof are provided to improve the impregnation uniformity and the amount of impregnation for a substrate material. CONSTITUTION: A producing method of a carbon composite comprises the following steps: preparing a carbon fiber cluster formed with carbon fibers(S10); producing diffusion fluid by mixing a liquid material with a substrate mixture containing solid substrate powder(S20); supplying the carbon fiber cluster to the diffusion fluid for dispersing the carbon fibers, and impregnating the substrate powder among the carbon fibers(S30); reeling the carbon fiber cluster after drying(S40); and weaving, molding, and plasticizing the carbon fiber cluster(S50).

Description

Carbon composite and its manufacturing method and clutch disc and its manufacturing method {CARBON COMPOSITE, MANUFACTURING METHOD THEREOF, DISK FOR CLUTCH, AND MANUFACTURING METHOD THEREOF}

The present invention relates to a carbon composite, and more particularly, to a carbon composite and a clutch disc using the same, which can reduce the manufacturing cost while increasing the penetration efficiency of the substrate material.

The carbon composite is completed by impregnating a liquid matrix to a bundle of carbon fibers as a reinforcing material, laminating them, and then molding and firing them. These carbon composites have excellent mechanical, thermal and dimensional stability, and are very resistant to friction and wear.

However, in order to obtain a carbon composite having a specific density, many impregnation and firing processes have to be repeated, which makes the manufacturing process complicated, takes a long time to manufacture, and increases the manufacturing cost. Thus, despite the superior performance of carbon composites, the field of application is very limited.

On the other hand, the clutch disk of the automobile is composed of a carbon fiber woven material bonded to the metal surface, or in the case of a large vehicle is composed of only the carbon composite. Clutch disc composed only of carbon composites, ① prepreg (pregreg) impregnated with a thermosetting polymer resin on the carbon fiber bundle to ensure a certain thickness, ② by forming a prepreg with a heat press to form a green body (green body) It is manufactured by the process of baking, ③ green body.

However, the clutch disk manufactured as described above has a density decrease due to pores and cracks generated during the carbonization process of the polymer resin. Therefore, the impregnation and refiring are repeated using a thermosetting polymer resin or an impregnation pitch, or a method of impregnating pyrolytic carbon in the pores and internal cracks by chemical vapor deposition is applied to increase the density. However, this method also involves a complicated process, which requires a considerable time for manufacturing and a high manufacturing cost.

The present invention is to provide a carbon composite, a method for manufacturing the same, and a disk for the clutch and a method for manufacturing the same, which can maximize the characteristic effect of the substrate by directly penetrating the solid substrate powder between the carbon fibers.

The present invention provides a carbon composite, a method for manufacturing the same, and a disk for the clutch and a method for manufacturing the same, which can increase the penetration effect of the substrate material on the carbon fiber and suppress the generation of pores and cracks caused by the substrate material. do.

The present invention simplifies the manufacturing process by reducing the number of processes of impregnation and firing, to shorten the manufacturing time, to provide a carbon composite, a method for manufacturing the same and a clutch disk using the same and a method for producing the same do.

In the method for producing a carbon composite according to an embodiment of the present invention, iii) preparing a carbon fiber bundle consisting of carbon fibers, ii) diffusion by mixing a liquid material in a substrate material mixture containing a solid substrate material powder Preparing a fluid, iii) supplying a bundle of carbon fibers to the diffusion fluid to diffuse the carbon fibers, infiltrating the substrate powder between the diffused carbon fibers, iii) drying and winding up the carbon fiber bundles, and Iii) weaving, shaping and firing the carbon fiber bundles.

The diffusion fluid may have a viscosity of 10 cP to 25 cP. The substrate mixture may include a carbon powder and a polymer resin having an average particle size of 5 μm or less, and the polymer resin may be included in an amount of 0.5 wt% to 20 wt% with respect to the carbon powder.

The substrate mixture further includes a ceramic powder, and the ceramic powder may be included in an amount of 10 wt% to 50 wt% based on the mixture of the carbon powder and the polymer resin.

The carbon powder may include a first carbon powder obtained from coke and a second carbon powder obtained by heat treatment of a solid pitch, and a mixing ratio of the first carbon powder and the second carbon powder may be 30:70 to 50:50. The first carbon powder may have a volatile content of 1.0% or less and an ash content of 0.1% or less, and the second carbon powder may have a softening point of 250 ° C. or more and a quinoline insoluble content of 80% or more.

The drying proceeds at a temperature of 120 ° C. to 200 ° C., the molding proceeds at a temperature of 450 ° C. to 600 ° C. and a pressure of 4 MPa to 9 MPa, and the firing can be performed at a temperature of 1,000 ° C. to 2,700 ° C.

Carbon composite according to an embodiment of the present invention is prepared by the method described above, has a compounding ratio of 30% to 70% and a coefficient of friction of 0.35 or less.

According to an embodiment of the present invention, there is provided a method for manufacturing a clutch disc, comprising: i) preparing a carbon fiber bundle made of carbon fibers, ii) mixing a liquid material in a matrix material mixture containing a solid matrix material powder. Preparing a diffusion fluid, iii) supplying a bundle of carbon fibers to the diffusion fluid to diffuse carbon fibers, infiltrating the substrate powder between the diffused carbon fibers, iii) drying and winding the carbon fiber bundles, Iii) weaving, primary shaping and firing the carbon fiber bundles to produce a fired body, and iii) secondary forming the fired body into a disc shape.

The diffusion fluid may have a viscosity of 10 cP to 25 cP. The substrate mixture may include a carbon powder and a polymer resin having an average particle size of 5 μm or less, and the polymer resin may be included in an amount of 0.5 wt% to 20 wt% with respect to the carbon powder.

The substrate mixture further includes a ceramic powder, and the ceramic powder may be included in an amount of 10 wt% to 50 wt% based on the mixture of the carbon powder and the polymer resin.

The carbon powder may include a first carbon powder obtained from coke and a second carbon powder obtained by heat treatment of a solid pitch, and a mixing ratio of the first carbon powder and the second carbon powder may be 30:70 to 50:50.

The clutch disc according to an embodiment of the present invention is manufactured by the above-described method, and has a compounding ratio of 30% to 70% and a coefficient of friction of 0.35 or less.

According to an embodiment of the present invention, since the carbon fibers are diffused using a diffusion fluid, the solid matrix material powder, ie, carbon powder, is directly penetrated between the carbon fibers, thereby facilitating the penetration of the substrate material and simultaneously infiltrating the substrate material. And the penetration uniformity of the substrate material can be improved.

Therefore, the carbon composite and the disc for the clutch according to the embodiment of the present invention can simplify the manufacturing process to lower the manufacturing cost, improve mechanical and thermal properties, and have very strong resistance to friction and wear.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a process flowchart showing a method of manufacturing a carbon composite according to an embodiment of the present invention.

Referring to FIG. 1, in the method of preparing a carbon composite, a first step (S10) of preparing a carbon fiber bundle and a method of preparing a diffusion fluid by mixing a liquid material in a substrate material mixture containing a solid substrate material powder A second step (S20), a third step (S30) of diffusing the carbon fiber to infiltrate the substrate powder therebetween, and a fourth step (S40) of drying and winding up the carbon fiber bundle in which the substrate material powder has penetrated; And a fifth step (S50) of weaving, shaping and firing the wound carbon fiber bundles.

In a first step S10, the carbon fiber bundle comprises a plurality of carbon fibers arranged side by side in at least one direction. Each carbon fiber may have a diameter of approximately 5 μm to 7 μm.

2 is a photograph showing one embodiment of a carbon fiber bundle. Referring to FIG. 2, carbon fibers arranged side by side in one direction are assembled to form a carbon fiber bundle. In a carbon fiber bundle, each carbon fiber is located separately from neighboring carbon fibers with a predetermined air layer in between.

In a second step S20, the diffusion fluid comprises a matrix mixture and a liquid substance for imparting viscosity. Substrate mixture is a mixture of the polymer resin to the carbon powder of the substrate material powder, and optionally further comprises a ceramic powder to increase the heat resistance.

The carbon powder has an average particle size of 5 μm or less. When the average particle size of the carbon powder exceeds 5㎛ carbon particles larger than the diameter of the carbon fiber penetrates between the carbon fibers, the carbon fibers may be cut to degrade the mechanical properties of the carbon composite material.

The carbon powder includes a first carbon powder obtained from coke and a second carbon powder obtained through heat treatment of a solid pitch. The first carbon powder may satisfy the conditions of 1.0% or less of volatile matter and 0.1% or less of ash as coke powder. The second carbon powder is a carbon powder prepared by heat-treating a solid pitch and may satisfy the conditions of a softening point of 250 ° C. or higher and a quinoline insoluble content of 80%.

In the first carbon powder, when the content of volatile matter exceeds 1.0%, weight loss occurs in the subsequent firing process, which may cause a decrease in density of the molded body. Ash is preferably contained at a low content of 0.1% or less since it functions as an oxidation promoter at high temperatures.

Since the second carbon powder serves as a binder for bonding the carbon fibers in the subsequent molding process, it is essential to exhibit meltability and flowability at the molding temperature. However, when the softening point of the second carbon powder is lower than 250 ° C., a weight reduction may occur during the firing process to cause a decrease in density of the molded body. In the second carbon powder, the higher the quinoline insoluble content, the higher the constant meltability can be obtained. However, if the content of the quinoline insoluble content is lower than 80%, the weight decrease occurs during the firing process to decrease the density of the molded body. May cause

While the first carbon powder has no caking, it serves to minimize weight loss by firing. The second carbon powder has a caking property and functions as a binder by this caking property. Therefore, the carbon powder should essentially include the second carbon powder. The mixing ratio of the first carbon powder and the second carbon powder may be 30:70 to 50:50. Outside of this range, the weight decrease due to sintering increases, thereby lowering the density of the molded body, degrading the bonding performance of the carbon fibers, and deteriorating the mechanical and thermal properties of the carbon composite.

As the polymer resin, a phenolic resin, for example, a phenolic novolak resin may be used. As the ceramic powder, silicon carbide (SiC), silicon nitride (Si ₃ N ₄ ) or mixtures thereof having excellent heat resistance may be used.

In the substrate mixture of the second step S20, the polymer resin may be included in an amount of 0.5 wt% to 20 wt% with respect to the carbon powder. When the polymer resin is included in less than 0.5% by weight relative to the carbon powder, the carbon powders penetrated between the carbon fibers in the third step (S30) may be separated by the lack of adhesion in the drying process of the fourth step (S40). On the other hand, if the polymer resin is included in more than 20% by weight relative to the carbon powder, the carbon fiber bundle is rigid after the infiltration process of the third step (S30) may be impossible to wind the fourth step (S40).

When the substrate mixture of the second step S20 further includes ceramic powder, the ceramic powder may be included in an amount of 10 wt% to 50 wt% based on the mixture of the carbon powder and the polymer resin. When the ceramic powder is included in less than 10% by weight relative to the mixture of the carbon powder and the polymer resin, the effect of improving the thermal properties of the carbon composite is insufficient. On the other hand, when the ceramic powder is included in more than 50% by weight relative to the mixture of the carbon powder and the polymer resin, the cohesive force of the substrate material mixture is lowered, the strength of the carbon composite may be lowered.

As the liquid substance included in the diffusion fluid, a polysaccharide-based liquid may be used. For example, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, hexylene glycol, butylene glycol, or Mixtures can be used. Such a glycol liquid is a polyhydric alcohol compound, and since it is a liquid, it is easy to mix with water and has viscosity, and is excellent in the effect which adheres carbon powder to the surface of a carbon fiber.

The diffusion fluid is a slurry containing the solid substrate powder, and serves to infiltrate the substrate powder between the carbon fibers by diffusing the carbon fibers in the third step (S30) described later.

In a third step S30, the carbon fiber bundle is continuously supplied to the diffusion fluid of the second step S20 to diffuse the carbon fibers, and the substrate material powder included in the diffusion fluid is infiltrated between the diffused carbon fibers. Here, 'diffusion of carbon fibers' refers to a phenomenon in which the gap between the individual carbon fibers is opened while the diffusion fluid penetrates between the individual carbon fibers.

For example, a feed roller can be used to move the carbon fiber bundles from the bottom to the top of the diffuser at a constant rate and to flow the diffusion fluid from the top of the diffuser to the bottom to achieve diffusion and substrate penetration of the carbon fibers.

Therefore, it is possible to easily infiltrate the substrate powder between the individual carbon fibers by using the diffusion phenomenon of the carbon fiber described above. As a result, it is possible to directly infiltrate the substrate powder between the carbon fibers, increase the penetration content of the substrate material and at the same time effectively improve the penetration uniformity of the substrate material.

At this time, the viscosity of the diffusion fluid may be 10cP to 25cP. If the viscosity of the diffusion fluid is less than 10 cP, the diffusion efficiency of the carbon fiber is lowered. If the viscosity of the diffusion fluid exceeds 25 cP, penetration of the substrate material powder is prevented. Therefore, in both cases, the penetration content and penetration uniformity of the substrate material are lowered.

In the fourth step (S40), the carbon fiber bundle penetrated by the substrate material powder is put into a dryer and dried, and the dried carbon fiber bundle is put into a winder and wound up.

The drying temperature may be 120 ° C to 200 ° C. If the drying temperature is lower than 120 ° C., the drying time may be long, which may increase the size of the drying apparatus and increase manufacturing costs. On the other hand, when the drying temperature exceeds 200 ° C., winding may be impossible due to melt curing of the polymer resin contained in the carbon fiber bundle.

3 is an electron micrograph showing a carbon fiber bundle that passed through the fourth step (S40). Referring to FIG. 3, it can be seen that the substrate powder is uniformly infiltrated between the carbon fibers and the surfaces of the carbon fibers.

In a fifth step (S50), the wound carbon fiber bundle is woven to a certain standard, then molded and fired to complete the carbon composite.

The wound carbon fiber bundles can be woven into plain weave, runner or multidimensional fabrics. The woven carbon fiber bundles are laminated in multiple layers, and then put into a pressure molding machine to produce hot molded products. Thereafter, the molded body is put into a firing furnace and fired to complete a carbon composite material.

In the firing process, the substrate material is crystallized to improve the high temperature and friction properties of the carbon composite, and the organic matter contained in the diffusion fluid is removed.

When the molded body is manufactured, the molding temperature may be 450 ° C. to 600 ° C., and the molding pressure may be 4 MPa to 9 MPa. If the molding temperature is less than 450 ℃ substrate material may not be sufficiently calcined, if the molding temperature exceeds 600 ℃ coke may occur due to unnecessary energy is consumed in the subsequent firing process may cause a cost increase. If the molding pressure is less than 4MPa, a sufficient molding pressure may not be obtained, and thus the density of the molded body may be lowered. If the molding pressure exceeds 9MPa, the density of the molded body may also be lowered because the substrate material inside the carbon fiber bundle is pushed out. .

Firing temperature during the production of the fired body may be 1,000 ° C to 2,700 ° C. If the firing temperature is less than 1,000 ° C., sufficient crystallization of the substrate material powder may not be achieved, and thus the high temperature and friction characteristics of the carbon composite may be lowered. On the other hand, when the firing temperature is higher than 2,700 ° C., the production cost may increase due to the high temperature and the production time may be extended.

The carbon composite thus completed diffuses the carbon fibers using the above-described diffusion fluid and then directly penetrates the substrate powder between the carbon fibers, thereby facilitating the penetration of the substrate material and simultaneously infiltrating the substrate material with the substrate content. The penetration uniformity can be improved.

Therefore, the carbon composite according to the present embodiment can simplify the manufacturing process and lower the manufacturing cost, improve mechanical and thermal properties, and have very strong resistance to friction and wear.

4 is a process flowchart showing a manufacturing method of a disk for a clutch according to an embodiment of the present invention.

Referring to Figure 4, the clutch disk manufacturing method, the first step (S10) to prepare a carbon fiber bundle, and mixing the liquid material to the substrate material mixture containing a solid substrate material powder to produce a diffusion fluid A second step (S20), a third step (S30) of diffusing the carbon fiber to infiltrate the substrate powder therebetween, and a fourth step (S40) of drying and winding up the carbon fiber bundle in which the substrate material powder has penetrated And a fifth step (S50) of primary molding and firing the wound carbon fiber bundle, and a sixth step (S60) of secondary molding of the fired body of the fifth step (S50).

Since the first step (S10) to the fifth step (S50) is the same as the above-described method for producing a carbon composite, a detailed description thereof will be omitted. In a sixth step S60, the clutch disk is completed by inserting the fired body into a molding machine into a disk-shaped disk having a hollow.

5 is a photograph showing a disk for a clutch completed by the above-described process. Referring to Figure 5, the clutch disk 100 is formed in a disk shape having a hollow, it can form a tooth along the edge of the hollow. The shape of the clutch disc 100 may be variously modified according to the vehicle type and the use.

Carbon composite and clutch disk according to an embodiment of the present invention has a compounding rate of 30% to 70% and a low coefficient of friction (μ) of 0.35 or less. Here, the compounding rate represents the weight ratio of carbon fiber to the weight of the substrate material. The compounding rate and the content of the substrate are inversely proportional.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the embodiments described below are only preferred embodiments of the present invention and the present invention is not limited to the following embodiments.

(Example 1)

A substrate material mixture was prepared by mixing 67 wt% of the first powder, 20 wt% of the second powder, and 13 wt% of the phenol resin, and 80 wt% of the aqueous solution of glycol was mixed with the substrate mixture to have a viscosity of 11 cP. Diffusion fluid was prepared. The diffuser fluid was used to diffuse the carbon fibers, infiltrate the substrate powder between the carbon fibers, and then dry, wind up, weave, primary molding, firing, and secondary molding to manufacture a disc for clutch. The primary molding pressure is 4 MPa, the primary molding temperature is 450 ° C., and the firing conditions are 1,450 ° C.-1 hour.

(Example 2)

A clutch disc was produced in the same manner as in Example 1 except that the primary molding pressure was 6 MPa, the primary molding temperature was 500 ° C., and the firing conditions were changed to 2,000 ° C.-1 hour.

(Example 3)

A substrate material mixture was prepared by mixing 34% by weight of the first powder, 20% by weight of the second powder, 33% by weight of silicon carbide (SiC), and 13% by weight of a phenol resin, and 75% by weight of an aqueous solution of glycol as a liquid in the substrate. A diffusion fluid having a viscosity of 21 cP was prepared by mixing in%. The diffusion fluid was used to diffuse the carbon fibers, infiltrate the substrate powder between the carbon fibers, and then dry, wind up, weave, first molding, baking, and second molding to manufacture a disc for clutch. The primary molding pressure is 6 MPa, the primary molding temperature is 450 ° C., and the firing conditions are 2,000 ° C.-1 hour.

(Example 4)

A clutch disc was produced in the same manner as in Example 3 except that the diffusion fluid had a viscosity of 11 cP, a primary molding pressure of 9 MPa, a primary molding temperature of 600 ° C., and a firing condition of 2,300 ° C.-1 hour. It was.

(Example 5)

A substrate material mixture was prepared by mixing 22 wt% of the first powder, 20 wt% of the second powder, 22 wt% of silicon carbide (SiC), 22 wt% of silicon nitride (Si ₃ N ₄ ), and 14 wt% of phenol resin. To 70% by weight of the aqueous solution of aqueous glycol solution was mixed with the ash mixture to prepare a diffusion fluid having a viscosity of 21 cP. The diffusion fluid was used to diffuse carbon fibers, permeate the substrate material between the carbon fibers, and then dry, wind up, weave, primary molding, firing, and secondary molding to produce a clutch disc. The primary molding pressure is 9 MPa, the primary molding temperature is 600 ° C., and the firing conditions are 2,300 ° C.-1 hour.

(Example 6)

A clutch disc was produced in the same manner as in Example 5 except that the firing conditions were changed to 2,700 ° C-1 hour.

(Comparative Example 1)

A clutch disc was produced in the same manner as in Example 1 except that the viscosity of the diffusion fluid was changed to 7 cP and the firing condition was 2,000 ° C.-1 hour.

(Comparative Example 2)

A clutch disc was produced in the same manner as in Example 3 except that the viscosity of the diffusion fluid was changed to 28 cP, the primary molding pressure was 600 MPa, and the primary molding temperature was changed to 600 ° C.

(Comparative Example 3)

32% by weight of the second powder, 33% by weight of silicon carbide (SiC), 22% by weight of silicon nitride (Si ₃ N ₄ ) and 13% by weight of a phenol resin were prepared to prepare a substrate mixture, and glycol as a liquid substance in the substrate mixture. An aqueous solution was mixed at 90% by weight to prepare a diffusion fluid having a viscosity of 7 cP. The diffusion fluid was used to diffuse the carbon fibers, infiltrate the substrate powder between the carbon fibers, and then dry, wind, weave, primary molding, firing, and secondary molding to manufacture a disc for clutch. The primary molding pressure is 6 MPa, the primary molding temperature is 450 ° C., and the firing conditions are 2,300 ° C.-1 hour.

(Comparative Example 4)

A clutch disc was produced in the same manner as in Example 5 except that the viscosity of the diffusion fluid was changed to 28 cP.

The compounding ratio and coefficient of friction characteristics of the clutch discs of Examples 1 to 6 and Comparative Examples 1 to 4 were evaluated.

As shown in Table 1, the clutch disks of Examples 1 to 6 exhibited a compounding ratio of 70% or less, and a friction coefficient of 0.35 or less. On the other hand, the clutch discs of Comparative Examples 1 to 4 exhibited a compounding ratio of 106 or more and a friction coefficient of 0.35 or more.

Clutch disc manufactured by the above-described method can improve the running stability and vibration damping in the cornering when applied to the vehicle enables stable cornering and running, and can contribute to the prevention of accidents.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

1 is a process flowchart showing a method of manufacturing a carbon composite according to an embodiment of the present invention.

2 is a photograph showing one embodiment of a carbon fiber bundle.

3 is an electron micrograph showing a carbon fiber bundle passed through the fourth step of FIG. 1.

4 is a process flowchart showing a manufacturing method of a disk for a clutch according to an embodiment of the present invention.

5 is a photograph showing a clutch disk completed by the method of FIG.

Claims (14)

Preparing a carbon fiber bundle made of carbon fibers, Preparing a diffusion fluid by mixing a liquid substance into a matrix mixture containing a solid substrate powder, Supplying the carbon fiber bundle to the diffusion fluid to diffuse the carbon fibers and infiltrate the solid substrate powder between the diffused carbon fibers, Winding the carbon fiber bundles after drying, and Weaving, forming and firing the carbon fiber bundles Method of producing a carbon composite comprising a. The method of claim 1, The diffusion fluid is a method of producing a carbon composite having a viscosity of 10cP to 25cP. The method of claim 2, The substrate mixture mixture includes a carbon powder and a polymer resin having an average particle size of 5 μm or less, wherein the polymer resin is contained in an amount of 0.5 wt% to 20 wt% with respect to the carbon powder. The method of claim 3, The substrate mixture further comprises a ceramic powder, wherein the ceramic powder is 10 to 50% by weight relative to the mixture of the carbon powder and the polymer resin. The method of claim 3, The carbon powder includes a first carbon powder obtained from coke and a second carbon powder obtained by heat treatment of a solid pitch, and a mixing ratio of the first carbon powder and the second carbon powder is 30:70 to 50:50. Method of preparation of the composite. The method of claim 5, Wherein the first carbon powder has a volatile content of 1.0% or less and an ash content of 0.1% or less, and the second carbon powder has a softening point of 250 ° C. or higher and a quinoline insoluble content of 80% or more. The method of claim 2, The drying is carried out at a temperature of 120 ℃ to 200 ℃, the molding is carried out at a temperature of 450 ℃ to 600 ℃ and a pressure of 4MPa to 9MPa, the firing is carried out at a temperature of 1,000 ℃ to 2,700 ℃ of the carbon composite Manufacturing method. A carbon composite prepared by the method of any one of claims 1 to 7, having a compounding ratio of 30% to 70% and a coefficient of friction of 0.35 or less. Preparing a carbon fiber bundle made of carbon fibers, Preparing a diffusion fluid by mixing a liquid substance into a matrix mixture containing a solid substrate powder, Supplying the carbon fiber bundle to the diffusion fluid to diffuse the carbon fibers and infiltrate the solid substrate powder between the diffused carbon fibers, Drying and winding the carbon fiber bundles, Weaving, primary molding and firing the carbon fiber bundle to produce a fired body, and Secondary molding the fired body into a disc shape Method for producing a disk for clutch comprising a. 10. The method of claim 9, And the diffusion fluid has a viscosity of 10 cP to 25 cP. The method of claim 10, The substrate material mixture includes a carbon powder and a polymer resin having an average particle size of 5 μm or less, wherein the polymer resin is contained in 0.5 wt% to 20 wt% with respect to the carbon powder. The method of claim 11, The substrate mixture further comprises a ceramic powder, wherein the ceramic powder is 10 to 50% by weight based on the mixture of the carbon powder and the polymer resin. The method of claim 11, The carbon powder includes a first carbon powder obtained from coke and a second carbon powder obtained by heat treatment of a solid pitch, and a mixing ratio of the first carbon powder and the second carbon powder is 30:70 to 50:50. Method for manufacturing a disk for A clutch disc made by the method of any one of claims 9 to 13 and having a compounding ratio of 30% to 70% and a coefficient of friction of 0.35 or less.

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