SiCaMoSi2/ZrO2aMoSi2 coating to protect C/C composites against oxidation

• Published in: Transactions of Nonferrous Metals Society of China Vol. 23; no. 7; pp. 2113 - 2117
• Main Authors: FU, Qian-gang, ZHANG, Jia-ping, ZHANG, Zheng-zhong, LI, He-jun, SUN, Can
• Format: Journal Article
• Language: English
• Published: 01-07-2013
• Subjects: Carbon; Carbon-carbon composites; Coating; Diffraction; Oxidation; Oxidation resistance; Protective coatings; Zirconium dioxide
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(13)62704-1

To improve the oxidation resistance of carbon/carbon (C/C) composites in air at high temperatures, a SiCaMoSi2/ZrO2aMoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method. The microstructures and phase compositions of the coated C/C composites were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The result shows that the SiCaMoSi2/ZrO2aMoSi2 coating is dense and crack-free with a thickness of 250a300 mu m. The preparation and the high temperature oxidation property of the coated composites were investigated. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 260 h at 1773 K in air. The excellent anti-oxidation performance of the coating is considered to come from the formation of ZrSiO4, which improves the stability of the coating at high temperatures.