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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

AI Technical Summary

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 reactions. The densification of the material, which makes the preparation process of the material have defects such as high energy consumption, time-consuming, and relatively complicated process, which leads to certain difficulties in the popularization and use of carbon / carbon composite materials.

Method used

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  • Preparation method of carbon/carbon composite material

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Experimental program
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Effect test

Embodiment 1

[0019] (1) Put the carbon fiber reinforcement (polyacrylonitrile-based carbon fiber) into the container first, and then put 800g of coal tar and AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.05) is mixed evenly, put into the container and placed in an autoclave, and after vacuuming for 30 minutes, the temperature is raised to 190°C, and then nitrogen is filled into the autoclave, and the nitrogen pressure is 4MPa. After 2 hours, the temperature was further raised to 400° C. and maintained at this temperature for 3 hours. Cool naturally to normal temperature after reaction finishes, open still and obtain carbon / carbon composite material (density is 1.34g / cm 3 );

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

Embodiment 2

[0022] (1) Put the carbon fiber reinforced body into the container first, then put 800g of coal tar and AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.05) is mixed evenly, put into the container and placed in an autoclave, and after vacuuming for 30 minutes, the temperature is raised to 190°C, and then nitrogen is filled into the autoclave, and the nitrogen pressure is 4MPa. After 2 hours, the temperature was further raised to 400° C. and maintained at this temperature for 3 hours. Cool naturally to normal temperature after reaction finishes, open still and obtain carbon / carbon composite material (density is 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), and a higher density carbon / carbon composite material can be obtained Material (density 1.55g / cm 3 );

[0024] The specific test d...

Embodiment 3

[0026] (1) Put the carbon fiber reinforced body into the container first, then put 500g of coal tar and AlCl 3 The catalyst (the mass ratio of catalyst to coal tar is 0.02) is mixed evenly, put into the container and placed in an autoclave, and after vacuuming for 30 minutes, the temperature is raised to 190°C, and then nitrogen is filled into the autoclave at a nitrogen pressure of 4 MPa. After 2 hours, the temperature was further raised to 420° C. and maintained at this temperature for 4 hours. Cool naturally to normal temperature after reaction finishes, open still and obtain carbon / carbon composite material (density is 1.31g / cm 3 );

[0027] The specific test data are 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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