A self-catalyzed high thermal conductivity c/c composite material and its preparation method

A composite material and high thermal conductivity technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of not being able to meet the application requirements of related structures, increasing the cost of material preparation, and reducing the use efficiency of materials , to achieve the effect of lowering temperature, improving performance and reducing voids

Active Publication Date: 2022-05-06
湖南东映碳材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the high-temperature heat treatment furnace brings huge energy consumption, long material processing cycle, and large investment, which increases the cost of material preparation; on the other hand, heat treatment at ultra-high temperature tends to generate thermal stress inside the material. The more internal stress accumulated inside, the lower the efficiency of the material may be, which cannot meet the application requirements of related structures

Method used

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Examples

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Effect test

preparation example Construction

[0022] The invention provides a preparation method of self-catalyzed high thermal conductivity C / C composite material, comprising the following steps:

[0023] (1) Under an inert atmosphere, boric acid and a titanium source are polymerized to obtain a polymer sol;

[0024] (2) mixing the polymer sol and the carbon precursor suspension dispersion to obtain a matrix dispersion;

[0025] (3) Infiltrate the matrix dispersion liquid into the carbon fiber braid, and obtain the prefabricated body after drying;

[0026] (4) Under vacuum conditions, the preform is subjected to hot-pressing treatment to obtain an intermediate;

[0027] (5) Under an inert atmosphere, the intermediate is subjected to carbonization treatment and graphitization treatment in sequence to obtain the self-catalyzed high thermal conductivity C / C composite material.

[0028] In the present invention, the titanium source in the step (1) is preferably tetrabutyl titanate, isopropyl titanate or ethyl titanate, mor...

Embodiment 1

[0053] Dissolve 2g of boric acid in 150mL of absolute ethanol, stir with a magnetic seed, dissolve 9.1g of isopropyl titanate in 303mL of THF solution, slowly add the isopropyl titanate solution dropwise into the boric acid solution to react to obtain For the polymer sol of Ti element, 160g of coal-based mesophase pitch was ground and pulverized, passed through a 200-mesh sieve, and then placed in 600mL of isopropanol solution with magnetic stirring for 10 hours, and the B-Ti sol was added to the asphalt suspension. Stir for 2 hours and mix evenly to form a matrix precursor dispersion containing B-Ti sol. Take 150g of mesophase pitch-based plain carbon cloth, cut it into a size of 200mm*200mm, and spray the dispersion evenly on the mesophase pitch-based On the plain weave carbon cloth, stack layers according to the isotropic fiber direction to prepare the preform, dry at 70°C for 3 hours, wait for the solvent to evaporate, press the preform under vacuum conditions, pressurize 4...

Embodiment 2

[0056] Dissolve 4g of boric acid in 250mL of absolute ethanol, stir with a magnetic seed, dissolve 23g of n-butyl titanate in 730mL of THF solution, slowly drop the n-butyl titanate solution into the boric acid solution to react to obtain B-Ti Elemental polymer sol, grind and pulverize 200g of naphthalene-based mesophase pitch, pass through a 200-mesh sieve, and then place it in 800mL of isopropanol solution for 12 hours with magnetic stirring, add B-Ti sol to the asphalt suspension, and stir with a magnetic seed 3h, mix evenly to form a matrix precursor dispersion containing B-Ti sol, take 280g of mesophase pitch-based satin carbon cloth, cut it into a size of 300mm*300mm, and then evenly coat the dispersion on the mesophase pitch by spraying On the base satin carbon cloth, stack layers according to the isotropic fiber direction to prepare the preform, dry it at 65°C for 2h, wait for the solvent to evaporate, put the preform under vacuum condition, pressurize 5MPa, at 1°C / min ...

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Abstract

The invention belongs to the technical field of material preparation. The invention provides a method for preparing a self-catalyzed high thermal conductivity C / C composite material. Boric acid and a titanium source undergo a polymerization reaction to obtain a polymer sol containing B-Ti element, and the polymer sol containing B-Ti element and The carbon precursor suspension dispersion liquid is mixed to obtain the matrix dispersion liquid; the matrix dispersion liquid is infiltrated into the carbon fiber braid, and the preform is obtained after drying treatment; the interface between the carbon fiber braid and the carbon precursor is improved by hot pressing, and the obtained Intermediate; in an inert atmosphere, the obtained intermediate is sequentially subjected to carbonization treatment and graphitization treatment to obtain a C / C composite material with high thermal conductivity from catalysis. In the preparation method provided by the invention, the matrix is ​​modified by infiltrating the sol containing graphitization catalytic elements on the carbon fiber fabric, the temperature required for graphitization is reduced, and the thermal conductivity of the composite material is improved.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a self-catalyzed high thermal conductivity C / C composite material and a preparation method thereof. Background technique [0002] C / C composite material has the characteristics of ultra-high temperature resistance, and has outstanding applications in the field of spacecraft ablation resistance. It is a new type of high thermal conductivity composite material with both load bearing and heat dissipation integration. The reinforcement is composed of high thermal conductivity carbon fiber, the precursor with high carbon residue rate and easy graphitization is used as the carbon source, and the C / C composite material can be obtained by high temperature hot pressing and heat treatment. In order to obtain good thermal conductivity and high rigidity, the reinforcing body carbon and the matrix carbon are required to have a good degree of graphitization and orientation, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/622B01J21/18
CPCC04B35/83C04B35/622B01J21/18C04B2235/616C04B2235/441C04B2235/3409C04B2235/6562C04B2235/6567C04B2235/658C04B2235/48C04B2235/9607
Inventor 叶崇刘玲黄东曾超廖超前伍孝余洋吴晃叶高明张岳峰刘金水
Owner 湖南东映碳材料科技股份有限公司
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