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Abstract
A Si–Mo–Al coating for protecting carbon/carbon (C/C) composites against oxidation at elevated temperature was prepared on the surface of the C/SiC coated C/C composites by slurry method. The phase composition, microstructure and oxidation resistance of the coating at 1773 K in air were investigated. The results show that the as prepared coating was mainly composed of SiC, MoSi2, Mo(Si,Al)2 and Si. The coating provided excellent oxidation protective ability at 1773 K in air and can effectively protect the C/C composites from oxidation for 150 h. The failure of the coating at 1873 K in air is attributed to the spalling of the glass layer during the oxidation tests.
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This work was supported by the National Natural Science Foundation of China under grant nos. 50902111 and 50972120, and by the NPU Foundation for Fundamental Research and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (grant no. 73-QP-2010), and supported by Shenzhen Key Laboratory of Special Functional Materials in Shenzhen University under grant no. T201010.