Carbon/carbon composite material as well as preparation method and application thereof

A carbon composite material and carbon composite technology, applied in the field of composite material preparation, can solve the problems of easy generation of stress, degradation of high temperature resistance and mechanical properties, difficulty in achieving thermal matching, etc., to achieve excellent high temperature oxidation resistance and improve high temperature oxidation resistance. performance, the effect of improving mechanical properties

Pending Publication Date: 2021-01-15
HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on this, technicians try to overcome the defects of poor high temperature oxidation resistance in carbon/carbon composite materials by preparing ternary composite materials of silicon carbide, molybdenum silicide and carbon/carbon materials
[0004] In the current technology, carbon, silicon carbide and molybdenum silicide are usually combined by hot pressing process, or directly use physical infiltration method to infiltrate molybdenum silicide powder or molybdenum silicide slurry into carbon/carbon body to prepare silicon carbide, molybdenum silicide and carbon/carbon However, the com

Method used

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  • Carbon/carbon composite material as well as preparation method and application thereof
  • Carbon/carbon composite material as well as preparation method and application thereof
  • Carbon/carbon composite material as well as preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0035]An embodiment of the present invention provides a method for preparing a carbon / carbon composite material, including the following steps S10 to S30.

[0036]Step S10, the carbon fiber preform is sequentially deposited with carbon and silicon carbide by a chemical vapor deposition method to obtain a carbon / carbon composite rough body containing silicon carbide.

[0037]First, the carbon fiber preform is deposited by carbon deposition and silicon carbide deposition sequentially by chemical vapor deposition to obtain a rough body; wherein the carbon deposition step densifies the carbon fiber preform to obtain a uniformly densified carbon / carbon composite body, and then passes through chemical vapor The deposition method performs silicon carbide deposition to obtain a uniform silicon carbide layer.

[0038]In some of the embodiments, the carbon fiber preform used in step S10 is made of carbon fiber cloth and carbon fiber mesh through alternate needle punching; further, the density of the c...

Example Embodiment

[0068]Example 1

[0069]1). T700 carbon fiber interwoven fabric and carbon fiber mesh are formed by alternately layered needle punching to prepare a carbon fiber preform. The density of the carbon fiber preform is 0.45g / cm3.

[0070]2) Put the carbon fiber preform obtained in step 1) into a chemical vapor deposition furnace, set the deposition temperature to 1100°C, use natural gas as a carbon source, and a natural gas flow rate of 3m3 / h, the furnace pressure is 1500Pa, the insulation deposition is 100h, and the density is 1.0g / cm3The densified carbon / carbon composite body.

[0071]3) Put the densified carbon / carbon composite body obtained in step 2) into a silicon carbide deposition furnace for silicon carbide deposition treatment, using trichloromethylsilane as a silicon source, a deposition temperature of 900°C, and a deposition pressure It is 1000Pa, the temperature is kept for 30h, and the density is 1.3g / cm3The carbon / carbon composite rough body containing silicon carbide.

[0072]4) Put ...

Example Embodiment

[0076]Example 2

[0077]1). T700 carbon fiber interwoven fabric and carbon fiber mesh are formed by alternately laminated needle punching to prepare a carbon fiber preform. The density of the carbon fiber preform is 0.4g / cm3.

[0078]2) Put the carbon fiber preform obtained in step 1) into a chemical vapor deposition furnace, set the deposition temperature to 1000°C, use natural gas as a carbon source, and a natural gas flow rate of 3m3 / h, the furnace pressure is 1500Pa, the heat preservation deposition is 100h, and the density is 0.9g / cm3The densified carbon / carbon composite body.

[0079]3) Put the densified carbon / carbon composite body obtained in step 2) into a silicon carbide deposition furnace for silicon carbide deposition treatment, using trichloromethylsilane as a silicon source, a deposition temperature of 1000°C, and a deposition pressure It is 500Pa, the temperature is kept and deposited for 50h, and the density is 1.25g / cm3The carbon / carbon composite rough body containing silico...

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Abstract

The invention relates to a carbon/carbon composite material as well as a preparation method and application thereof. The preparation method of the carbon/carbon composite material comprises the following steps: sequentially carrying out carbon deposition and silicon carbide deposition on a carbon fiber preform by adopting a chemical vapor deposition method to obtain a silicon carbide-containing carbon/carbon composite rough blank, dipping the carbon/carbon composite rough blank in a molybdenum source solution, baking the carbon/carbon composite rough blank, carrying out reduction reaction in areducing atmosphere to obtain a carbon/carbon composite precursor containing elemental molybdenum, and finally, carrying out melt siliconizing treatment on the carbon/carbon composite precursor to obtain the carbon/carbon composite material containing silicon carbide and molybdenum silicide. The internal components of the carbon/carbon composite material prepared by the preparation method are uniform and stable, the difference between the internal and external layer components is small, the difference between the internal thermal expansion coefficients of the material is small, and the carbon/carbon composite material has excellent high-temperature oxidation resistance and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a carbon / carbon composite material and its preparation method and application. Background technique [0002] In recent years, carbon / carbon composites (C / C) have gradually become a research hotspot. Carbon / carbon composite materials have the advantages of low thermal expansion coefficient, low density, ablation resistance, corrosion resistance, good friction, good thermal and electrical conductivity, high strength and high modulus, and are widely used in aviation, aerospace and civil industries. However, carbon / carbon composites will suffer oxidation weight loss under aerobic conditions higher than 370 °C, resulting in a significant decline in the mechanical properties of the material, which seriously restricts the application of carbon / carbon composites. [0003] Molybdenum disilicide has the advantages of high melting point, low density, good thermal con...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/84C04B35/65
CPCC04B35/65C04B35/83C04B2235/3826C04B2235/3839C04B2235/483C04B2235/608C04B2235/77C04B2235/96
Inventor 廖寄乔李军邓华峰石磊龚智李丙菊刘学文王跃军
Owner HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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