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Preparation method of bidirectional high-thermal-conductivity carbon/carbon composite material

A technology of carbon composite materials and high thermal conductivity, which is applied in the field of preparation of two-way high thermal conductivity carbon/carbon composite materials, can solve problems such as poor product quality, and achieve high bending strength, high thermal conductivity, and high performance.

Active Publication Date: 2021-08-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methods of preparing high thermal conductivity carbon / carbon composite materials from pitch-based carbon fibers are also different. Most of the domestic methods are to weave pitch-based carbon fibers that are carbonized at about 1500°C and have good flexibility into carbon cloth, and then prepare carbon / carbon plates. process, and finally graphitized at a high temperature of 2800-3000 ° C, so that the high-temperature graphitization shrinkage of carbon fibers will lead to poor product quality, how to use ultra-high modulus, high thermal conductivity graphite fibers through hot pressing, impregnation, vapor deposition, carbonization It is a problem that needs to be researched and solved at present for the preparation of high thermal conductivity carbon / carbon composite materials directly
In addition, at present, bidirectional high thermal conductivity carbon / carbon composite materials are basically prepared at home and abroad, and there are few reports on the preparation of bidirectional high thermal conductivity carbon / carbon composite materials.

Method used

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  • Preparation method of bidirectional high-thermal-conductivity carbon/carbon composite material
  • Preparation method of bidirectional high-thermal-conductivity carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Six layers of carbon fiber (with a modulus of 700 GPa and a thermal conductivity of 900 W / (m K)) unidirectional fabric were laminated with five sets of graphite films (5 layers of polycarbonate with a thermal conductivity of 1200 W / (m K) and a thickness of 40 μm). imide-based graphite film) and coal tar pitch powder (softening point of 158°C, ash content of 100ppm) alternate layup (pitch powder-carbon fiber unidirectional cloth X-direction layup-pitch powder-graphite film lamination-pitch powder-carbon fiber Unidirectional cloth Y-direction layer-asphalt powder alternately) in a stainless steel mold of the corresponding size, cover the mold cover plate, put it on a hot press and raise the temperature to 200°C, pressurize to 5MPa hot-press composite molding, heat preservation and pressure After 0.5h, cool down naturally to obtain the prefabricated body; carbonize the prefabricated body without removing the mold at 1000°C, take it out after cooling, and then repeatedly spr...

Embodiment 2

[0029] Replace the carbon fiber unidirectional fabric with a modulus of 700GPa and a thermal conductivity of 900W / (m K) with a carbon fiber unidirectional fabric with a modulus of 900GPa and a thermal conductivity of 900W / (m K). Other conditions are the same as in Implementation 1. The density of the obtained two-way high thermal conductivity carbon / carbon composite material is 1.75g / cm 3 , X thermal conductivity coefficient is 653W / (m·K), Y thermal conductivity coefficient is 651W / (m·K), X-direction bending strength is 249MPa, Y-direction bending strength is 252MPa.

Embodiment 3

[0031] Replace the carbon fiber unidirectional fabric with a modulus of 700GPa and a thermal conductivity of 900W / (m K) with a carbon fiber unidirectional fabric with a modulus of 700GPa and a thermal conductivity of 1000W / (m K). Other conditions are the same as in Implementation 1. The density of the obtained two-way high thermal conductivity carbon / carbon composite material is 1.74g / cm 3 , X thermal conductivity coefficient is 731W / (m·K), Y thermal conductivity coefficient is 746W / (m·K), X-direction bending strength is 217MPa, Y-direction bending strength is 219MPa.

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Abstract

The invention discloses a preparation method of a bidirectional high-thermal-conductivity carbon / carbon composite material, and belongs to the technical field of composite material preparation. According to the method, ultrahigh-modulus and high-thermal-conductivity carbon fiber one-way cloth or two-way cloth, a high-thermal-conductivity graphite film laminated layer and asphalt powder are alternately laid for repeated hot pressing-carbonization, chemical vapor deposition, repeated high-pressure impregnation of high-residual carbon asphalt, carbonization, and finally graphitization is performed to obtain the bidirectional high-thermal-conductivity carbon / carbon composite material. The carbon / carbon composite material has high thermal conductivity and bending strength in the X-axis direction and the Y-axis direction, and is wide in application range.

Description

technical field [0001] The invention relates to a preparation method of a bidirectional high thermal conductivity carbon / carbon composite material, which belongs to the technical field of composite material preparation. Background technique [0002] With the rapid development of science and technology, the components used in high-end equipment generate more and more heat. How to efficiently export heat has become a key problem that needs to be solved urgently. High thermal conductivity carbon / carbon composite materials have a series of excellent properties such as high specific modulus, high specific strength, low density, thermal shock resistance, ablation resistance, high thermal conductivity, low expansion, etc. Whether it is missile nose cone, aircraft brake pad, rocket engine Aerospace military equipment such as nozzle throat liner, space shuttle wing leading edge and nose cone, or civilian electrical device components such as computers, 5G equipment, and mobile communi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/83C04B35/622C04B2235/48C04B2235/425C04B2235/5256C04B2235/614C04B2235/616C04B2235/658C04B2235/656C04B2235/77C04B2235/96C04B2235/9607
Inventor 马兆昆张型伟曹瑞雄王录周强
Owner BEIJING UNIV OF CHEM TECH