Method for preparing carbon/carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating

Abstract

The invention relates to a method for preparing a carbon / carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating. An induction heating auxiliary impulse arc discharge deposition method is adopted for preparing the carbon / carbon composite yttrium silicate whisker reinforced C-AlPO4-SiCn complex external coating which has a uniform surface free from microcracks, is uniform in thickness, has no penetrable holes or cracks, and is higher in binding force and good in oxidation resistance. As suspended charge particles have high energy and are high in diffusion migration rate under the condition of induction heating, the reaction is accomplished in a water heat kettle at one time, and pulsed arc discharge sintering is accompanied; the coating is dense and uniform, has a higher interface binding force, and is not required to be subjected to post heat treatment; the preparation cost is low; and the method is simple to operate and short in preparation cycle. In addition, the electromagnetic induction heating can allow local high temperature and high pressure to be generated in a reaction system rapidly, so that the reaction activation energy of yttrium silicate whiskers, and C-AlPO4 and SiCn suspended particles is reduced effectively, the yttrium silicate whiskers, and C-AlPO4 and SiCn suspended particles can react more completely and sufficiently during the pulsed arc discharge deposition process; and the coating with a dense structure is obtained.

Description

technical field [0001] The invention relates to a method for preparing a carbon / carbon composite material composite outer coating, in particular to a method for preparing a carbon / carbon composite material yttrium silicate whisker reinforced C-AlPO 4 -SiC n Method of composite topcoat. Background technique [0002] C / C composite material is also called carbon fiber carbon-based composite material. Because it is only composed of a single carbon element, it not only has the advantages of excellent ablation resistance, low density and low thermal expansion coefficient of carbon and graphite materials, but also has the advantages of high temperature resistance. Has excellent mechanical properties. In particular, its strength does not decrease but increases with the increase of temperature, making it one of the promising high-tech new materials, and is widely used as ablation materials and thermal structural materials in the field of aviation and aerospace technology. However,...

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Problems solved by technology

The use of supercritical fluid technology to prepare C / C composite coatings requires high temperature and high pressure for the preparation process, which requires high equipment requirements, and the formed outer coating should be heat treated in an inert atmosphere, and the preparation cycle Relatively long [Bemeburg P L, Krukonis V J.Processing of carbon / carbon composites using supercritical fluid technology[P].United States Patent US5035921,1991], the coating prepared by the in-situ forming method needs to be treated at a high temperature of 1500°C, and Can not be prepared at one time [Huang Jian-Feng, Li He-Jun, Zeng Xie-Rong, Li Ke-Zhi.Surf.coat.Technol.2006,200,5379.], the outer coating prepared by sol-gel method The surface is easy to crack and the coating thickness is insufficient [Huang Jian-Feng, Zeng Xie-Rong, Li He-Jun, Xiong Xin-Bo, Sun Guo-ling.Surf.coat.Technol.2005,190,255.], while using The preparation of the coating by the slurry coating reaction method still has the disadvantages of multiple coatings, which cannot be completed at one time, and requires post-heat treatment [Fu Qian-Gang, Li He-Jun, Wang Yong-Jie, Li Ke-Zhi, Tao Jun. Surface & Coating Technology.2010, 204, 1832.], although some alloy coatings have been prepared by explosive spraying and ultrasonic spraying, the process still has many imperfections, and the prepared high-temperature oxidation resistance still needs further improvement. Improvement of [Terentieva V S, Bogachkova O P, Goriatcheva E V. Method for protecting products made of a refractory material against oxidation, and resulting products [p]. US5677060, 1997.], and the preparation of coatings by hydrothermoelectrophoretic deposition [ Huang Jianfeng, Wang Bo, Li Hejun, Liu Miao, Cao Liyun, Yao Chunyan. A MoSi 2 / SiC oxidation protective coating for carbon / carbon composites[J].Corrosion Science,2011,2(53):834-839.]

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