Oxidation protective SiC-Si coating for carbon/carbon composites by gaseous silicon infiltration and pack cementation: A comparative investigation |
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Authors: | Lei Zhou Qiangang Fu Dou Hu Yalong Wei Mingde Tong Jiaping Zhang |
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Affiliation: | Shaanxi Key Laboratory of Fiber Reinforced Light-Weight Composites, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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Abstract: | To reduce the influence of coating preparation on the mechanical properties of carbon/carbon composites and further improve the antioxidant properties of the coating, a SiC-Si coating was fabricated on carbon/carbon composites by gaseous silicon infiltration (GSI-SiC-Si). For comparison, a SiC-Si coating was also prepared by pack cementation (PC-SiC-Si). A comparative investigation showed the GSI-SiC-Si coating possesses relative lower roughness, better mechanical and anti-oxidation properties. The GSI-SiC-Si coating samples maintained 87.8 % flexural strength of bare C/C composites, while the C/C substrate was severely siliconized in PC-SiC-Si coating samples. The GSI-SiC-Si coating samples could undergo 30 thermal cycles between 1773 K and room temperature and effectively protect C/C composites from oxidation at 1773 K for more than 500 h without weight loss. |
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Keywords: | C/C composites Thermal-shock resistance Oxidation resistance Mechanical properties |
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