High-efficiency and low-cost near-net forming preparation method of C/C-HfC composite material

A composite material and near-net-shaping technology, which is applied in the field of preparation of hafnium carbide ceramic modified C/C composite material (C/C-HfC), can solve the difficult control of reaction infiltration process, low HfC doping amount, and difficulty in problems such as near-size forming, to achieve the effects of low cost, strong process controllability and short process cycle

Active Publication Date: 2018-05-29
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The present invention provides a C / C- A method for preparing HfC carbon-ceramic composite materials with high efficiency, low cost, near net shape and effective control of the structure and properties of C / C-HfC composite materials, specifically including the following technical steps:

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  • High-efficiency and low-cost near-net forming preparation method of C/C-HfC composite material
  • High-efficiency and low-cost near-net forming preparation method of C/C-HfC composite material

Examples

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Embodiment 1

[0028] Example 1: Using continuous carbon fiber as raw material, a carbon fiber preform was prepared by a lamination and puncturing process without weft cloth, and the fiber volume fraction of the carbon fiber preform was 30%. The carbon fiber preform is heated to 1500 in a vacuum environment o C heat treatment for 1h to remove the adhesive on the surface of the fiber. A pyrolytic carbon protective coating is prepared on the carbon fiber surface of the heat-treated carbon fiber preform by using a chemical vapor deposition process, and the thickness of the pyrolytic carbon protective layer is 300 nm. Using the chemical vapor infiltration process to continue to deposit pyrolytic carbon inside the porous carbon fiber prefabricated body, the porous carbon fiber prefabricated body is densified to obtain a porous C / C composite material prefabricated body, and the density of the porous C / C composite material prefabricated body is controlled at 1.0g / cm 3 . Dissolve phenolic resin an...

Embodiment 2

[0029]Example 2: Using continuous carbon fiber as raw material, a carbon fiber preform was prepared by using a non-weft cloth laminated puncture process, and the fiber volume fraction of the carbon fiber preform was 25%. The carbon fiber preform is heated to 1400 in a vacuum environment o C heat treatment for 2 hours to remove the adhesive on the surface of the fiber. A pyrolytic carbon protective coating is prepared on the carbon fiber surface of the heat-treated carbon fiber preform by using a chemical vapor deposition process, and the thickness of the pyrolytic carbon protective layer is 800 nm. The chemical vapor infiltration process is used to continue to deposit pyrolytic carbon inside the porous carbon fiber prefabrication, and the porous carbon fiber prefabrication body is densified to obtain a porous C / C composite material prefabrication body. The density of the porous C / C composite material prefabrication body is controlled at 0.9g / cm 3 . Dissolve phenolic resin an...

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Abstract

The invention provides a high-efficiency and low-cost near-net forming preparation method of a C / C-HfC composite material. The preparation method specifically comprises the following steps: (1) preparation of a carbon fiber preform with a fiber protection layer; (2) preparation of a porous C / C composite material preform; (3) preparation of soaking slurry; (4) preparation of coating slurry; and (5)preparation of the C / C-HfC composite material. Compared with the prior art, the preparation technology provided by the invention can solve the problem that residual metal after melt reaction infiltration is easy to adhere to the prepared composite material, and can realize the near-net forming of a C / C-HfC carbon-ceramic composite material; by combination of slurry soaking and surface slurry coating, the content of metal hafnium introduced into the C / C composite material can be reasonably controlled, and the process controllability is high; and the process is short in period and high in efficiency, and the prepared carbon-ceramic composite material is low in cost.

Description

technical field [0001] The invention belongs to the technical field of carbon-ceramic composite material preparation, and in particular relates to a preparation method of hafnium carbide ceramic modified C / C composite material (C / C-HfC). Background technique [0002] C / C composite material is a composite material composed of carbon fiber reinforced phase and carbon matrix phase, with low density, high strength, high thermal shock resistance, low thermal expansion coefficient, zero humidity expansion, high temperature strength and modulus with temperature rise It is one of the ideal high-temperature heat-resistant structural materials. However, C / C composite materials are significantly oxidized and ablated under high-temperature and high-speed airflow, which can no longer meet the requirements of the new generation of high-performance aerospace vehicles for high-temperature and heat-resistant structural materials. Introducing refractory carbides into C / C composites and repla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/622C04B35/62857C04B35/83C04B2235/404C04B2235/616C04B2235/6562C04B2235/658
Inventor 仝永刚白书欣胡永乐张虹叶益聪谢炜许凤凰谢新琪祝文涛黄浩
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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