A Si–Mo–W Coating to Protect SiC-Coated Carbon/Carbon Composites Against Oxidation |
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Authors: | Qian-Gang Fu He-Jun Li Ke-Zhi Li Ke Tong |
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Affiliation: | C/C Composites Research Center, Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | In order to protect carbon/carbon (C/C) composites against oxidation, a Si–Mo–W coating was prepared on the surface of SiC-coated C/C composites by a simple reaction method. The microstructures of the as-received coating were characterized by scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy analyses. The results show that the SiC/Si–Mo–W coating can protect C/C composites from oxidation in air at 1673 K for 220 h with a mass loss of 0.003%, and at 1773 K for 252 h with a mass gain of 1.56%. The excellent oxidation-resistant property of the SiC/Si–Mo–W coating at 1673–1773 K is attributed to the formation of SiO2 film on the coating surface. The mass loss of the coated C/C composites during the oxidation test at 1873 K in air primarily resulted from the reaction of C/C substrate and oxygen diffusing through the penetration cracks in the coating. |
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