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采用结合包埋法和溶胶凝胶法(sol-gel)在碳/碳(C/C)复合材料表面制备了SiC-SiC/TaC涂层,借助扫描电镜、X射线衍射等手段对涂层的微观组织形貌和物相组成进行观察与分析。结果表明:该包埋工艺中SiC为晶须状生长形成具有晶须增韧的涂层,且溶胶-凝胶法制备的外涂层致密有效的填充了SiC晶须间空隙并完全覆盖,涂层厚度由4μm增加至8μm,从而具备良好的防氧化性能。涂层试样在1000℃静态空气中氧化2 h,质量损失在2%以内,远低于纯C/C试样及单一SiC涂层保护C/C试样。
The SiC-SiC / TaC coating was prepared on the carbon / carbon (C / C) composites by a combination of embedding method and sol-gel method. Microstructure and phase composition were observed and analyzed. The results show that the SiC whiskers grow in the embedding process to form a coating with whisker toughening, and the outer coating prepared by the sol-gel method is dense and effective to fill the gap between the SiC whiskers and completely cover the coating Layer thickness increased from 4μm to 8μm, which has good oxidation resistance. The coating samples were oxidized in static air at 1000 ℃ for 2 h, the mass loss was less than 2%, much lower than pure C / C samples and C / C samples protected by a single SiC coating.