A method for rapidly preparing high-density C / C composite materials based on polyarylacetylene resin

Abstract

A method for rapidly preparing high-density C / C composites based on polyarylacetylene resin. The purpose of the present invention is to solve the problems of long preparation cycle, low graphitization degree, poor ablation resistance, etc. of existing C / C composites. Preparation method: First, mix polyarylacetylene resin and solvent; Second, perform vacuum impregnation on the low-viscosity resin solution and carbon fiber braid; Third, perform isostatic pressing treatment; Fourth, cure in an oven; Fifth, perform pyrolysis treatment; Sixth, perform graphitization treatment; Seventh, impregnate the graphitized C / C composite into the low-viscosity resin solution, and then perform vacuum impregnation, isostatic pressing treatment, curing treatment, pyrolysis treatment, and graphitization treatment; Eighth, repeat step seven multiple times. The C / C composites obtained by the present invention can have a density greater than 1.90 g / cm<supgt;3< / supgt;, high density, excellent mechanical properties and oxidation ablation resistance, short preparation cycle, low equipment dependence, and can be used for the preparation of large-sized C / C composites with complex shapes.

Description

Technical Field

[0001] The invention relates to a method for preparing a high-density C / C composite material based on polyarylacetylene resin, specifically a method in which a low-viscosity polyarylacetylene resin solution is firstly completely filled with pores of a carbon fiber braid through vacuum impregnation and cold isostatic pressing processes, then the C / C composite material is prepared by heating, curing and cracking, and finally the high-density C / C composite material is quickly prepared through multiple cycles of carbonization and graphitization processes. Background Art

[0002] C / C is a very promising class of ultra-high temperature structural composite materials composed of carbon fiber reinforcement and carbonaceous matrix. It has low density, excellent mechanical properties, outstanding thermophysical properties and outstanding ablation resistance. It is the only candidate material for service environment above 3000℃. It is widely used in aviation, aerospace, rail transportation, nuclear energy, special high-temperature equipment, medicine and other fields, such as solid rocket engine nozzles, high-speed aircraft leading edges, aircraft brake discs, heating electrodes, single crystal silicon smelting furnaces and artificial bones.

[0003] After nearly 50 years of research, three typical C / C composite material preparation technology routes represented by resin impregnation cracking process, asphalt hot isostatic pressing process and chemical vapor deposition process have gradually been formed. Compared with the hot isostatic pressing process using asphalt as a carbon source precursor and the chemical vapor deposition / infiltration process using hydrocarbon gas, the impregnation cracking process using resin as a carbon source precursor has the significant advantages of being green, low-cost and short-cycle. However, traditional carbon source precursors such as phenolic and furfural resins have disadvantages such as low carbon yield and difficulty in graphitization, resulting in a long preparation cycle, low degree of graphitization and poor ablation resistance of C / C composite materials. Researchers have tried to increase the graphitization degree of resin carbon by adding various forms of catalysts such as iron, nickel, silicon, boron, etc., using catalysts to form solid solutions with carbon and then precipitate graphite crystals. However, the catalyst has a high volume content and preferentially melts and sublimates in ultra-high temperature service environments, exposing a large number of structural defects, resulting in poor ablation resistance of C / C composite materials, which limits its use. Therefore, the failure to achieve high graphitization of resin carbon using catalytic graphitization technology is a technical bottleneck that limits the preparation of high-performance C / C composites from resin precursors. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of long preparation cycle, low graphitization degree, poor ablation resistance and the like of existing C / C composite materials, and to provide a method for rapidly preparing high-density C / C composite materials by multiple PAA resin viscosity control, vacuum impregnation, cold isostatic pressing, cracking and graphitization.

[0005] The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin of the present invention is implemented by the following steps:

[0006] 1. Weigh polyarylacetylene (PAA) resin and solvent according to volume fraction and place them in a beaker, and mix them evenly by heating and stirring to obtain a low-viscosity resin solution;

[0007] 2. placing the low-viscosity resin solution and the carbon fiber braid in a vacuum oven, controlling the vacuum degree in the vacuum oven to 80-100 Pa for vacuum impregnation, and obtaining a carbon fiber braid impregnated with PAA resin;

[0008] 3. Placing the carbon fiber braid impregnated with PAA resin in a rubber sheath, and performing isostatic pressing treatment with a cold isostatic pressing device at a pressure of 100MPa to 500MPa, so that the resin is fully infiltrated into the pores of the braid, and obtaining a carbon fiber braid after isostatic pressing treatment;

[0009] Fourth, placing the carbon fiber braid after isostatic pressing in an oven and adjusting the temperature to make the PAA resin gel and cure to obtain a dense carbon fiber reinforced PAA resin composite material;

[0010] 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 800° C. to 1500° C. to obtain a carbon / carbon (C / C) composite material;

[0011] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2000° C. to 2950° C. to obtain a graphitized C / C composite material;

[0012] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0013] 8. Repeat the process of step 7 for multiple times until the desired density is reached to obtain a high-density C / C composite material;

[0014] The volume fraction of the polyarylacetylene resin in step 1 is 80% to 90%.

[0015] The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin of the present invention has the following beneficial effects:

[0016] The polyarylacetylene (PAA) resin monomers in the present invention are m-diethynylbenzene and phenylacetylene, and the monomers are composed of only two elements, C and H. The theoretical mass yield of carbonization exceeds 90wt.%, and the volume yield exceeds 50vol.%. The theoretical density of a 50vol.% carbon fiber braid after impregnation-cracking 6 times will exceed 99vol.%.

[0017] The polyarylacetylene resin used in the present invention is a graphitizable resin material, and its graphitization degree exceeds 80% after high-temperature heat treatment, providing microstructural guarantee for excellent anti-oxidation and ablation performance. The present invention adopts a vacuum impregnation and cold isostatic pressing process to achieve efficient filling of the polyarylacetylene resin solution inside the C / C composite material, significantly shortening the preparation cycle and cost.

[0018] The present invention first fills the pores of the carbon fiber braid with a low-viscosity polyarylacetylene resin through vacuum impregnation and cold isostatic pressing processes, then heats up to solidify and crack to achieve rapid filling of the pores, and finally multiple cycles and graphitization processes are used to prepare a high-performance, short-cycle C / C composite material. The C / C composite material obtained by this method has a short preparation cycle, high density, and excellent mechanical properties, and has a wide range of applications in aviation, aerospace, and civil fields. This method frees high-density C / C composite materials from dependence on hot isostatic pressing equipment and vapor deposition equipment, and the preparation of C / C composite materials can be completed by relying only on ovens, cold isostatic presses, and conventional cracking and graphitization furnaces. It can be promoted and applied to achieve large-scale production, and promote the industrialization process of low-cost C / C composite materials.

[0019] The C / C composite material prepared by the present invention has a high density (≥1.90g / cm 3 ), high density (≥95vol.%), excellent mechanical properties (flexural strength ≥140MPa) and anti-oxidation and ablation properties (linear ablation rate ≤0.01mm / s), short preparation cycle and low equipment dependence, can be used for the preparation of complex shape and large size C / C composite materials, improves production efficiency and reduces production costs, has engineering application prospects and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a macroscopic photograph of the C / C composite material obtained in Example 1 of the present invention;

[0021] Figure 2 This is a scanning electron microscope image of the C / C composite material obtained in Example 1 of the present invention;

[0022] Figure 3 This is an oxyacetylene test diagram of the C / C composite material obtained in Example 1 of the present invention;

[0023] Figure 4 RAMAN-mapping (G peak intensity / D peak intensity) image of the C / C composite material obtained in Example 1 of the present invention (high degree of yellow graphitization);

[0024] Figure 5 This is a macroscopic photograph of the C / C composite material obtained in Example 2 of the present invention;

[0025] Figure 6This is a scanning electron microscope image of the C / C composite material obtained in Example 2 of the present invention;

[0026] Figure 7 This is a bending strength stress-strain curve of the C / C composite material obtained in Example 2 of the present invention. DETAILED DESCRIPTION

[0027] Specific implementation method 1: The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin in this implementation method is implemented according to the following steps:

[0028] 1. Weigh polyarylacetylene (PAA) resin and solvent according to volume fraction and place them in a beaker, and mix them evenly by heating and stirring to obtain a low-viscosity resin solution;

[0029] 2. placing the low-viscosity resin solution and the carbon fiber braid in a vacuum oven, controlling the vacuum degree in the vacuum oven to 80-100 Pa for vacuum impregnation, and obtaining a carbon fiber braid impregnated with PAA resin;

[0030] 3. Placing the carbon fiber braid impregnated with PAA resin in a rubber sheath, and performing isostatic pressing treatment with a cold isostatic pressing device at a pressure of 100MPa to 500MPa, so that the resin is fully infiltrated into the pores of the braid, and obtaining a carbon fiber braid after isostatic pressing treatment;

[0031] Fourth, placing the carbon fiber braid after isostatic pressing in an oven and adjusting the temperature to make the PAA resin gel and cure to obtain a dense carbon fiber reinforced PAA resin composite material;

[0032] 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 800° C. to 1500° C. to obtain a carbon / carbon (C / C) composite material;

[0033] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2000° C. to 2950° C. to obtain a graphitized C / C composite material;

[0034] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0035] 8. Repeat step 7 for multiple times until the desired density is reached to obtain a high-density C / C composite material;

[0036] The volume fraction of the polyarylacetylene resin in step 1 is 80% to 90%.

[0037] In step 2 of this embodiment, the weaving method of the carbon fiber braid includes, but is not limited to, acupuncture, acupuncture + stitching, 3D, 3-axis 4-way or 3-axis 5-way.

[0038] This embodiment proposes a technical process combining vacuum impregnation and cold isostatic pressing to achieve rapid filling of PAA resin in the internal pores of C / C composite materials. Rapid preparation of high-density C / C composite materials is achieved through multiple PAA resin viscosity control, vacuum impregnation, cold isostatic pressing, cracking and graphitization.

[0039] Specific implementation method 2: This implementation method is different from specific implementation method 1 in that the solvent described in step 1 is acetone, butanone, benzene or xylene.

[0040] Specific implementation method three: This implementation method is different from specific implementation methods one or two in that in step one, the heating temperature range of the polyarylacetylene (PAA) resin is controlled to be 40° C. to 80° C., and the stirring rate range is 100 rad / min to 1000 rad / min.

[0041] Specific embodiment 4: This embodiment is different from any one of specific embodiments 1 to 3 in that the volume fraction of the carbon fibers in the carbon fiber braid impregnated with the PAA resin in step 2 is in the range of 20 vol.% to 55 vol.%.

[0042] Specific implementation method five: This implementation method is different from specific implementation methods one to four in that in step three, a cold isostatic pressing device is used to perform isostatic pressing treatment at a pressure of 100 to 500 MPa for 2 to 4 hours.

[0043] Specific implementation method 6: The difference between this implementation method and any one of specific implementation methods 1 to 5 is that the temperature in step 4 is adjusted to 100° C. to 220° C.

[0044] Specific embodiment 7: This embodiment is different from any one of specific embodiments 1 to 6 in that in step 5, the cracking treatment is performed at a temperature of 800° C. to 1500° C. for 1.5 to 2 hours.

[0045] Specific implementation eight: This implementation differs from any one of specific implementations one to seven in that the cracking furnace described in step five is a vacuum cracking furnace or an inert atmosphere cracking furnace.

[0046] Specific embodiment 9: This embodiment is different from any one of specific embodiments 1 to 8 in that in step 6, the graphitization treatment is performed at a temperature of 2000° C. to 2950° C. for 2 hours.

[0047] Specific embodiment 10: The difference between this embodiment and specific embodiments 1 to 9 is that the density of the high-density C / C composite material in step 6 is 1.4 g / cm 3 ~1.95g / cm 3 .

[0048] Example 1: The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin in this example is implemented by the following steps:

[0049] 1. Weigh 90 parts of polyarylacetylene (PAA) resin and 10 parts of acetone by volume and place them in a beaker, heat to 50°C, stir and mix at 500 rad / min to obtain a low-viscosity resin solution (solution viscosity ≤ 50 Pa·s);

[0050] 2. Place the low viscosity resin solution and 50 vol.% carbon fiber braid (3D braiding method) in a vacuum oven, control the vacuum degree in the vacuum oven to 100 Pa, so that the resin fully infiltrates the pores inside the carbon fiber braid, and obtain a carbon fiber braid impregnated with PAA resin;

[0051] 3. Placing the carbon fiber braid containing PAA resin in a rubber sheath, and performing isostatic pressing treatment at a pressure of 100 MPa for 2 hours using a cold isostatic pressing device to allow the resin to fully penetrate into the pores of the braid, thereby obtaining a carbon fiber braid after isostatic pressing treatment;

[0052] Fourth, placing the isostatically pressed carbon fiber braid in an oven and adjusting the temperature to 100°C, and then gradually increasing the temperature to 220°C to gel and solidify the PAA resin to obtain a dense carbon fiber reinforced PAA resin composite material;

[0053] 5. Placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 1200° C. for pyrolysis treatment for 2 hours to carbonize the PAA resin to obtain a carbon / carbon (C / C) composite material;

[0054] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2950° C. for 2 hours to graphitize the resin carbon into graphite, thereby obtaining a graphitized C / C composite material;

[0055] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0056] 8. Repeat step 7 three times to obtain a high-density C / C composite material with a density of 1.95 g / cm 3 .

[0057] Figure 3 This is an oxyacetylene test diagram of the high-density C / C composite material obtained in this example, showing that the linear ablation rate is ≤0.01 mm / s.

[0058] observe Figure 4, the yellow area in the figure is the position with higher Raman scattering IG / ID value, that is, the area with higher degree of graphitization, which corresponds to the carbon matrix after heat treatment of polyarylacetylene resin, that is, the matrix has a higher degree of graphitization, indicating that the matrix prepared in this embodiment has a high degree of graphitization; the red area in the figure is the position with lower Raman scattering IG / ID value, that is, the area with lower degree of graphitization, which corresponds to the carbon reinforcement after heat treatment of carbon fiber, that is, the reinforcement has a lower degree of graphitization.

[0059] Example 2: The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin in this example is implemented by the following steps:

[0060] 1. Weigh 80 parts of polyarylacetylene (PAA) resin and 20 parts of benzene by volume and place them in a beaker, heat to 40°C, stir and mix at 1000 rad / min to obtain a low-viscosity resin solution;

[0061] 2. Place the low viscosity resin solution and 20 vol.% carbon fiber braid (needle punching + stitching braiding method) in a vacuum oven, control the vacuum degree in the vacuum oven to 50 Pa, so that the resin fully infiltrates the internal pores of the carbon fiber braid to obtain a carbon fiber braid containing PAA resin;

[0062] 3. Placing the carbon fiber braid containing PAA resin in a rubber sheath, and performing isostatic pressing treatment at a pressure of 500 MPa for 4 hours using a cold isostatic pressing device to allow the resin to fully penetrate into the pores of the braid, thereby obtaining a carbon fiber braid after isostatic pressing treatment;

[0063] Fourth, placing the isostatically pressed carbon fiber braid in an oven and adjusting the temperature to 100°C, and then gradually increasing the temperature to 220°C to gel and solidify the PAA resin to obtain a dense carbon fiber reinforced PAA resin composite material;

[0064] 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 800° C. for pyrolysis treatment for 2 h to obtain a carbon / carbon (C / C) composite material;

[0065] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2000° C. for 3 hours to obtain a graphitized C / C composite material;

[0066] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0067] 8. Repeat step 7 four times until the density is 1.80g / cm 3 , and obtain a high-density C / C composite material.

[0068] Figure 6 This is a scanning electron microscope picture of the C / C composite material obtained in this example. It can be seen that the C / C composite material is microscopically dense.

[0069] Figure 7 The bending strength stress-strain curve of the C / C composite material prepared in this embodiment shows that the bending strength of the C / C composite material can reach 361.60 MPa, which can be widely used in thermal components.

[0070] Example 3: The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin in this example is implemented by the following steps:

[0071] 1. Weigh 70 parts of polyarylacetylene (PAA) resin and 30 parts of acetone by volume and place them in a beaker, heat to 60°C, stir and mix at 100 rad / min to obtain a low-viscosity resin solution;

[0072] 2. Place the low viscosity resin solution and 45 vol.% carbon fiber braid (3D braiding method) in a vacuum oven, control the vacuum degree in the vacuum oven to 80 Pa, so that the resin fully infiltrates the pores inside the carbon fiber braid, and obtain a carbon fiber braid containing PAA resin;

[0073] 3. Placing the carbon fiber braid containing PAA resin in a rubber sheath, and performing isostatic pressing treatment at a pressure of 200 MPa for 5 hours using a cold isostatic pressing device to allow the resin to fully penetrate into the pores of the braid, thereby obtaining a carbon fiber braid after isostatic pressing treatment;

[0074] Fourth, placing the isostatically pressed carbon fiber braid in an oven and adjusting the temperature to 100°C, and then gradually increasing the temperature to 220°C to gel and solidify the PAA resin to obtain a dense carbon fiber reinforced PAA resin composite material;

[0075] 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 1500° C. for pyrolysis treatment for 1 hour to obtain a carbon / carbon (C / C) composite material;

[0076] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2600° C. for 1 hour to graphitize the resin carbon into graphite, thereby obtaining a graphitized C / C composite material;

[0077] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0078] 8. Repeat step 7 several times until the density reaches 2.00g / cm 3 , and obtain a high-density C / C composite material.

[0079] Example 4: The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin in this example is implemented by the following steps:

[0080] 1. Weigh 90 parts of polyarylacetylene (PAA) resin and 10 parts of acetone by volume and place them in a beaker, heat to 70°C, stir and mix at 1000 rad / min to obtain a low-viscosity resin solution;

[0081] 2. Place the low viscosity resin solution and 30 vol.% carbon fiber braid (needle punching + stitching braiding method) in a vacuum oven, control the vacuum degree in the vacuum oven to 60 Pa, so that the resin fully infiltrates the internal pores of the carbon fiber braid, and obtain a carbon fiber braid containing PAA resin;

[0082] 3. Placing the carbon fiber braid containing PAA resin in a rubber sheath, and performing isostatic pressing treatment at a pressure of 300 MPa for 2 hours using a cold isostatic pressing device to allow the resin to fully penetrate into the pores of the braid, thereby obtaining a carbon fiber braid after isostatic pressing treatment;

[0083] Fourth, placing the isostatically pressed carbon fiber braid in an oven and adjusting the temperature to 100°C, and then gradually increasing the temperature to 220°C to gel and solidify the PAA resin to obtain a dense carbon fiber reinforced PAA resin composite material;

[0084] 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace at a temperature of 1000° C. for pyrolysis for 3 hours to obtain a carbon / carbon (C / C) composite material;

[0085] 6. placing the carbon / carbon (C / C) composite material in a graphitization furnace and graphitizing it at a temperature of 2400° C. for 1 hour to obtain a graphitized C / C composite material;

[0086] 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body;

[0087] 8. Repeat step 7 four times until the density is 1.85g / cm 3 , and obtain a high-density C / C composite material.

Claims

1. A method for rapidly preparing high-density C / C composite materials based on polyarylacetylene resin, Features The method for preparing a high-density C / C composite material is achieved by the following steps:

1. Weigh the polyarylacetylene resin and the solvent according to the volume fraction and put them into a beaker, and mix them evenly by heating and stirring to obtain a low-viscosity resin solution; 2. placing the low-viscosity resin solution and the carbon fiber braid in a vacuum oven, controlling the vacuum degree in the vacuum oven to 80-100 Pa for vacuum impregnation, and obtaining a carbon fiber braid impregnated with PAA resin; 3. Place the carbon fiber braid impregnated with PAA resin in a rubber sheath, and use a cold isostatic pressing device to perform isostatic pressing treatment at a pressure of 100 MPa to 500 MPa for 2 to 4 hours to allow the resin to fully penetrate into the pores of the braid to obtain a carbon fiber braid after isostatic pressing treatment; Fourth, placing the carbon fiber braid after isostatic pressing in an oven and adjusting the temperature to make the PAA resin gel and cure to obtain a dense carbon fiber reinforced PAA resin composite material; 5. placing the dense carbon fiber reinforced PAA resin composite material in a pyrolysis furnace for pyrolysis treatment at a temperature of 800° C. to 1500° C. to obtain a carbon / carbon composite material; 6. placing the carbon / carbon composite material in a graphitization furnace and graphitizing it at a temperature of 2000° C. to 2950° C. to obtain a graphitized C / C composite material; 7. Impregnating the graphitized C / C composite material into a low-viscosity resin solution, and then performing vacuum impregnation, isostatic pressing, curing, cracking, and graphitization to obtain a C / C composite material body; 8. Repeat the process of step 7 several times until the desired density is reached to obtain a high-density C / C composite material; The volume fraction of the polyarylacetylene resin in step 1 is 80% to 90%; the volume fraction of the carbon fiber in the carbon fiber braid impregnated with the PAA resin in step 2 is in the range of 20 vol.% to 50 vol.%.

2. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features The solvent described in step 1 is acetone, butanone, benzene or xylene.

3. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features In step 1, the heating temperature range of the polyarylacetylene resin is controlled to be 40° C. to 80° C., and the stirring rate range is 100 rad / min to 1000 rad / min.

4. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features In step 4, the temperature is adjusted to 100°C ~ 220°C.

5. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features In step 5, the cracking treatment is carried out at a temperature of 800°C to 1500°C for 1.5 to 2 hours.

6. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features The cracking furnace described in step 5 is a vacuum cracking furnace or an inert atmosphere cracking furnace.

7. The method for rapidly preparing a high-density C / C composite material based on polyarylacetylene resin according to claim 1, Features In step six, the graphitization treatment is performed at a temperature of 2000° C. to 2950° C. for 2 hours.

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