Si-W-Mo coating for SiC coated carbon/carbon composites against oxidation |
| |
Authors: | Ke-Zhi Li Dang-She Hou He-Jun Li Qian-Gang Fu Geng-Sheng Jiao |
| |
Affiliation: | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China |
| |
Abstract: | In order to prevent carbon/carbon (C/C) composites from oxidation at 1773 K, a Si-W-Mo coating was prepared on the surface of SiC coated C/C composites by a simple pack cementation technique. The microstructures and phase composition of the as-received multi-coating were examined by SEM, XRD and EDS. It was seen that the compact multi-coating was composed of α-SiC, Si and (WxMo1 − x)Si2. Oxidation behaviour of the SiC/Si-W-Mo coated C/C composites was also studied. After 315 h oxidation in air at 1773 K and thermal cycling between 1773 K and room temperature for 17times, no weight loss of the as-coated C/C composites was measured. The excellent anti-oxidation ability of the multi-coating is attributed to its dense structure and the formation of the stable glassy SiO2 film on the coating surface during oxidation. |
| |
Keywords: | Carbon/carbon composites Coating Oxidation |
本文献已被 ScienceDirect 等数据库收录! |