Method for improving heat conductivity of carbon/carbon compound material

A technology of carbon composite materials and thermal conductivity, which is applied in the field of carbon/carbon composite material manufacturing, can solve the problems that it is difficult to exert the heat conduction function of graphene, and the improvement of the thermal conductivity of carbon/carbon composite materials is limited, so as to improve compatibility and bonding strength, reducing energy consumption, and increasing the degree of graphitization

Active Publication Date: 2013-12-25
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, if the compatibility and close combination between graphene and matrix carbon cannot be achieved, as well as the control of graphene orientation, the introduction of graphene will also form a new interface phase ins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Graphene oxidation treatment: Take a certain amount of commercial graphene and put it into the concentrated nitric acid solution to ensure that the concentrated nitric acid liquid surface is completely submerged in the graphene. Soak the concentrated nitric acid solution in a constant temperature water bath at 60°C for 2 hours and then filter it. After cleaning with a large amount of deionized water, graphene oxide was prepared, and dried for later use.

[0026] 2) Take out the graphene oxide treated in step 1) and pour it into an agate crucible, add a certain amount of alcohol (the mass ratio of graphene oxide to alcohol is 1:3), make it into a slurry and add the same mass as graphene oxide The boron oxide was carefully ground in a mortar for 3 hours, then the excess boron oxide was washed off with a large amount of alcohol and deionized water, and dried to obtain boron-doped graphene powder.

[0027] 3) Crush the mesophase pitch into powder and add a certain amount...

Embodiment 2

[0041] The carbon fiber fabric structure is punctured by carbon cloth, and the rest are the same as in Example 1. The resulting material has a final density of 1.96 g / cm 3 , The thermal conductivity is 197W / m·K.

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Abstract

The invention relates to a method for improving heat conductivity of a carbon/carbon compound material, and belongs to the technical field of carbon/carbon compound material preparation. According to the method, mesophase pitch with high orientation characteristics is adopted for replacing original general pitch or resin to serve as a base body carbon precursor, and boron-doped graphene is added into the mesophase pitch to serve as a heat-conducting additive for further improving the heat conductivity of the carbon/carbon compound material, wherein the orientated flowing of the mesophase pitch can realize that the orientations of a sheet layer of graphene and base body carbon are basically the same, and the overall graphitization degree of the material can be increased at a lower temperature due to doping of a graphitization catalyst-boron; boron and graphene are bonded together and a catalytic graphitization mechanism of boron is that the overall graphitization degree of the material is increased by making up dimensional structure defects in the carbon material, so that a new boron catalyst/base body carbon interface cannot be introduced in a boron doping process, but the compatibility and the bonding strength of base body carbon of the mesophase pitch and graphene can be effectively improved.

Description

technical field [0001] The invention relates to a method for improving the thermal conductivity of a carbon / carbon composite material, and belongs to the technical field of carbon / carbon composite material manufacturing. Background technique [0002] C / C composite materials have always been the strategic missiles of advanced countries because of their excellent high-temperature mechanical properties and thermophysical properties, such as high specific strength, high specific modulus, high thermal conductivity, low linear expansion coefficient, strong designability, and thermal shock resistance. One of the most important material solutions for the key hot end parts of the warhead. However, with the development of near-space technology, more stringent requirements are placed on the performance of ablative and non-ablative carbon / carbon thermal protection materials. The near-space aircraft needs to fly in the adjacent space at ultra-high sound speed (usually greater than 10 Ma...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 樊桢冯志海孔清余立琼赵高文
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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