Preparation method of carbon/carbon composite material

A carbon composite material and carbon fiber technology, which is applied in the field of carbon/carbon composite material preparation, can solve the problems of difficulty in popularizing and using carbon/carbon composite materials, high energy consumption of the preparation process, and complicated process, so as to shorten the production cycle and reduce the reaction The effect of temperature and cheap price

Active Publication Date: 2015-01-28
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the prior art, the preparation of carbon/carbon composite materials usually needs to be carried out at a relatively high temperature (not less than 750°C) by heat-induced free radical polymerization, cracking and other rea

Method used

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  • Preparation method of carbon/carbon composite material

Examples

Experimental program
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Effect test

Example Embodiment

[0018] Example 1

[0019] (1) Put the carbon fiber reinforcement (polyacrylonitrile-based carbon fiber) into the container first, and then mix 800g of coal tar with AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.05) is uniformly mixed and then put into the container and placed in the autoclave. After vacuuming for 30 minutes, the temperature is raised to 190°C, and then the autoclave is filled with nitrogen, the nitrogen pressure is 4MPa, and soaked After 2 hours, the temperature was continued to rise to 400°C and kept at this temperature for 3 hours. After the reaction is over, it is naturally cooled to normal temperature, and the kettle is opened to obtain a carbon / carbon composite material (with a density of 1.34g / cm 3 );

[0020] The specific test data is shown in Table 1.

Example Embodiment

[0021] Example 2

[0022] (1) Put the carbon fiber reinforcement into the container, and then mix 800g of coal tar with AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.05) is uniformly mixed and then put into the container and placed in the autoclave. After vacuuming for 30 minutes, the temperature is raised to 190°C, and then the autoclave is filled with nitrogen, the nitrogen pressure is 4MPa, and soaked After 2 hours, the temperature was continued to rise to 400°C and kept at this temperature for 3 hours. After the reaction is over, it is naturally cooled to normal temperature, and the kettle is opened to obtain a carbon / carbon composite material (with a density of 1.34g / cm 3 );

[0023] (2) In order to further increase the density of the carbon / carbon composite material, the carbon / carbon composite material obtained in step (1) is densified for the second time according to step (1) to obtain a higher density carbon / carbon composite material Material (density 1...

Example Embodiment

[0025] Example 3

[0026] (1) Put the carbon fiber reinforcement into the container, and then mix 500g of coal tar with AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.02) is uniformly mixed and put into the container and placed in the autoclave. After vacuuming for 30 minutes, the temperature is raised to 190°C, and then nitrogen is filled into the autoclave. The nitrogen pressure is 4MPa and immersed. After 2 hours, the temperature was continued to rise to 420°C and kept at this temperature for 4 hours. After the reaction is over, it is naturally cooled to normal temperature, and the kettle is opened to obtain a carbon / carbon composite material (with a density of 1.31g / cm 3 );

[0027] The specific test data is shown in Table 1.

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Abstract

The invention belongs to a preparation method of a carbon/carbon composite material, in particular to a method for catalytically carbonizing a compacted carbon/carbon composite material. The preparation method is characterized by comprising the following steps: uniformly mixing carbon fiber reinforcement which is used as a reinforcement phase, coal tar (or other substances containing polycyclic aromatic hydrocarbon such as asphalt) which is used as a soaking agent and lewis acid of a given ratio, placing the mixture into a high-pressure kettle, and catalytically carbonizing the mixture to obtain the carbon/carbon composite material. In order to improve the density of the composite material, the carbon/carbon composite material can be soaked in multiple times so as to be compacted. Compared with the traditional process for compacting the carbon/carbon composite material by virtue of polymerization and splitting decomposition of radicals caused by the heat under the high temperature, the heating temperature needed by the catalytic carbonization method is low; moreover, the coal tar with low cost is selected, so that the manufacturing cost of the carbon/carbon composite material is greatly reduced.

Description

technical field [0001] The invention belongs to a method for preparing a carbon / carbon composite material, in particular to a method for catalytic carbonization and densification of a carbon / carbon composite material. Background technique [0002] With the development of science and technology, modern society has higher and higher requirements for materials, such as: high strength, low density, ultra-high thermal conductivity or heat insulation, high temperature resistance and other properties. For carbon / carbon composite materials, it has excellent properties such as extremely high melting point, good thermal stability and high temperature mechanical properties, low thermal expansion coefficient, low density, corrosion resistance, and good thermal shock resistance. It is widely used in military and civilian applications. The market has been widely used. The densification process of carbon / carbon composites is mainly divided into liquid phase impregnation method (impregnati...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 李四中段淼
Owner HUAQIAO UNIVERSITY
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