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Carbon-carbon composite material as well as preparation process and application thereof

A carbon-carbon composite material and carbonization technology, applied in the field of parts and components, can solve the problems of short life, less ash, and high cost

Active Publication Date: 2020-10-23
湖南碳谷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of long production cycle, high cost and short service life of the existing carbon-carbon composite materials, and provides a carbon-carbon composite material and its preparation process and application. The present invention can shorten the production cycle by more than 40% and reduce the cost compared with the traditional process More than 50%, the mechanical properties are increased by more than 20%, and the ash content is less, the purity is high, and it has good application prospects and market prospects in aerospace, semiconductor and other fields

Method used

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  • Carbon-carbon composite material as well as preparation process and application thereof
  • Carbon-carbon composite material as well as preparation process and application thereof
  • Carbon-carbon composite material as well as preparation process and application thereof

Examples

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preparation example Construction

[0042] A carbon-carbon composite material preparation process, including preform preparation, impregnating agent raw material preparation, multi-stage densification reaction; preform preparation includes the following steps:

[0043] S1. Green body preparation: Weave carbon fiber into a three-dimensional braided body according to the product structure to obtain a carbon fiber braided body with a volume density of 0.3-0.6g / cm 3 ;

[0044] S2. Chemical vapor deposition: 83-88% of natural gas and 12-17% of nitrogen are introduced into the closed reaction furnace, the pressure in the furnace is controlled at 1-5KPa, the temperature is 1050-1150°C, and the time is 70-130h, and the carbon fiber braided body Carry out chemical vapor deposition to obtain a density of 0.9-1.3g / cm 3 Preforms with vapor-deposited carbon;

[0045] Preparation of impregnating agent raw materials:

[0046] S3. Mix ethylene tar and hydrogenating agent in a ratio of 2:1 to 3 by weight and add it to the react...

Embodiment 1

[0056] A carbon-carbon composite material, the carbon-carbon composite material includes 28% of carbon fiber, 38% of vapor deposited carbon, and 34% of impregnated carbon by mass.

[0057] The carbon fiber is a modified carbon fiber, and the modification process of the carbon fiber is as follows: heating the carbon fiber to 800°C in an inert gas containing less than 2% oxygen, keeping it warm for 3.0h, and then cooling it to room temperature in the inert gas, and then the carbon fiber Put in concentrated nitric acid with a concentration of 45% to oxidize for 1.5 hours, wash with deionized water to pH=7, then dry in the air, and finally coat and dry with a silane coupling agent with a concentration of 4.5%.

[0058] The impregnated carbon is obtained by reacting an impregnating agent, and the impregnating agent is a polymer obtained by reacting ethylene tar and a hydrogenating agent in a ratio of 1:1 by weight.

[0059] The hydrogenating agent is tetrahydronaphthalene, tetrahyd...

Embodiment 2

[0074] A carbon-carbon composite material, the carbon-carbon composite material includes, by mass, 25.64% of carbon fiber, 33.77% of vapor-deposited carbon, and 43.59% of impregnated carbon.

[0075] The carbon fiber is a modified carbon fiber, and the modification process of the carbon fiber is as follows: heating the carbon fiber to 600°C in an inert gas containing less than 2% oxygen, keeping it warm for 3.0h, and then cooling it to room temperature in the inert gas, and then the carbon fiber Put in concentrated nitric acid with a concentration of 45% to oxidize for 1 hour, wash with deionized water to pH=7, then dry in the air, and finally coat and dry with a silane coupling agent with a concentration of 2%.

[0076] The impregnated carbon is obtained by reacting an impregnating agent, which is a polymer obtained by reacting ethylene tar and a hydrogenating agent in a ratio of 2:1 by weight.

[0077] The hydrogenating agent is tetrahydronaphthalene, NaBH4, i-Bu2AlH.

[00...

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Abstract

The invention belongs to the technical field of parts, and particularly relates to a carbon-carbon composite material as well as a preparation process and application thereof. The prepared carbon-carbon composite material comprises the following components in percentage by mass: 20%-36% of carbon fibers, 28%-45% of vapor deposition formed carbon and 26%-48% of impregnation formed carbon. The preparation process of the carbon-carbon composite material comprises the following steps of: preparing a prefabricated body, preparing an impregnant raw material and carrying out multi-stage densificationreaction. The carbon-carbon composite material disclosed by the invention can keep normal-temperature mechanical properties, thermophysical properties and frictional wear properties in high-temperature and ultra-high-temperature environments, and has relatively good application prospects and market prospects. The preparation method disclosed by the invention is high in economic benefit and reduces the cost by 50%, and the carbon-carbon composite material disclosed by the invention can be produced on a large scale.

Description

technical field [0001] The invention belongs to the technical field of components, and in particular relates to a carbon-carbon composite material and its preparation process and application. Background technique [0002] The development of the aerospace industry is in the ascendant, and the demand for carbon-carbon composite materials is increasing day by day. It is the material of choice for rocket nose cones, throat linings, air rudders, and nozzles; brake discs (pieces) are essential parts for aircraft, high-speed rail, and racing cars. Carbon-carbon composite materials have excellent friction and wear properties, and have the characteristics of light weight, low noise, shock absorption, braking and safety, and have become urgently needed and desired products in the production of this industry. [0003] However, the existing carbon-carbon composite material preparation technology has a long production cycle, high cost, and short life, which have become bottlenecks restri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52
CPCC04B35/52C04B35/521C04B35/83C04B2235/656C04B2235/6567C04B2235/658C04B2235/96
Inventor 刘俊锋
Owner 湖南碳谷新材料有限公司
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