Method for preparing carbon/carbon composite material C-AlPO4 outer coating through microwave hydrothermal electrophoretic arc-discharge deposition

Abstract

The invention relates to a method for preparing a carbon / carbon composite material C-AlPO4 outer coating through microwave hydrothermal electrophoretic arc-discharge deposition. The method comprises the steps of: adding C-AlPO4 powder into acetylacetone to prepare suspension A, and adding elementary iodine into the suspension A to obtain solution B; pouring the solution B into a hydrothermal reaction kettle, clamping a carbon / carbon composite material test sample with a SiC inner coating onto a cathode clamp in the hydrothermal reaction kettle, sealing the hydrothermal reaction kettle and putting the hydrothermal reaction kettle into a microwave generator; after microwave hydrothermal electrophoretic arc-discharge deposition is ended, naturally cooling to room temperature; and opening the hydrothermal reaction kettle, taking out the test sample and drying the test sample to obtain the final product, i.e. a SiC-C / C test sample protected by the C-AlPO4 outer coating. The C-AlPO4 composite outer coating prepared by adopting the method has the advantages of uniform thickness and no surface crack. The method for preparing the C-AlPO4 composite outer coating has the advantages that the steps are simple, the operation is convenient to conduct, the raw materials are easy to obtain, the preparation period is short and the cost is low. The prepared C-AlPO4 composite outer coating can protect the C / C composite material for 500 hours in 1500 DEG C static air and the rate of weight loss caused by oxidization is only 0.8 percent.

Description

technical field [0001] The invention relates to a method for preparing a composite outer coating of carbon / carbon composite materials---microwave hydrothermoelectrophoresis arc discharge deposition method, in particular to a preparation method with a uniform and dense surface and a uniform thickness without penetrating cracks and pinholes. Preparation of Carbon / Carbon Composite C-AlPO by Microwave Hydrothermoelectrophoretic Arc Discharge Deposition 4 Method of overcoating. 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,...

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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 US 5035921,1991], the coating prepared by the in-situ forming method needs to be treated at a high temperature of 1500°C, And it cannot 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 of the layer 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 The preparation of the coating by the molten 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. The prepared high-temperature oxidation resistance 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].US 5677060,1997.], and microwave hydrothermal electrophoresis arc discharge Preparation of C-AlPO by Deposition Method 4 The method of outer coating has not been reported yet

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