A Si-Mo-W Coating to Protect SiC-Coated Carbon/Carbon Composites Against Oxidation

• Published in: Journal of the American Ceramic Society Vol. 92; no. 9; pp. 2132 - 2135
• Main Authors: Fu, Qian-Gang, Li, He-Jun, Li, Ke-Zhi, Tong, Ke
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.09.2009; Wiley Subscription Services, Inc
• Subjects: Carbon; Ceramics; Materials science; Oxidation; Protective coatings; Spectrum analysis
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2009.03144.x

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.