A MoSi2-SiC-Si oxidation protective coating for carbon/carbon composites |
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Authors: | He-Jun Li Hui Xue Yong-Jie Wang Qian-Gang Fu Dong-Jia Yao |
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Affiliation: | C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China |
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Abstract: | To protect carbon/carbon (C/C) composites from oxidation, a dense coating has been produced by a two-step pack cementation technique. XRD and SEM analysis shows that the as-obtained coating was composed of MoSi2, SiC and Si with a thickness of 80-100 μm. The MoSi2-SiC-Si coating has excellent anti-oxidation property, which can protect C/C composites from oxidation at 1773 K in air for 200 h and the corresponding weight loss is only 1.04%. The weight loss of the coated C/C composites is primarily due to the reaction of C/C substrate and oxygen diffusing through the penetration cracks in the coating. |
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Keywords: | Carbon/carbon composites Coating Oxidation |
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