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

Abstract

The invention relates to a method for preparing a carbon / carbon composite yttrium silicate whisker reinforced mullite-C-AlPO4 complex external coating. A pulsed arc discharge deposition method is adopted to prepare the yttrium silicate whisker reinforced mullite-C-AlPO4 complex antioxidant external coating; the reaction is accomplished in a water heat kettle at one time; pulsed arc discharge sintering is accompanied; the obtained coating is dense and uniform, has a higher interface binding force and is not required to be subjected to post heat treatment; the advantages of yttrium silicate whiskers, mullite and C-AlPO4 are integrated well; and the prepared yttrium silicate whisker reinforced mullite-C-AlPO4 complex antioxidant external coating has a uniform surface without microcracks, is uniform in thickness, has no penetrable holes or cracks, and is higher in binding force and good in oxidation resistance.

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 mullite-C-AlPO 4 Composite topcoat method 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, C / C...

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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 must be heat treated in an inert atmosphere. 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 coating prepared 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 is not yet Further improvement is needed [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.], as well as preparation of coated Layer [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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