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为提高C/C复合材料的高温抗氧化性能,以聚碳硅烷(PCS)浸渍裂解法和Si,Mo,W粉浆料刷涂反应法在C/C复合材料表面制备SiC-MoSi2-WSi2复合涂层,借助X射线衍射仪、扫描电镜等分析手段,对涂层的微观形貌、组织结构及物相进行分析研究,优化涂层制备工艺,考察了涂层的高温抗氧化性能,分析了抗氧化机理。制备的SiC-MoSi2-WSi2复合涂层厚度200μm左右,主要由SiC,MoSi2,WSi2构成。1 500℃氧化试验结果表明复合涂层的静态氧化失重率较SiC单层涂层降低50%以上,较大地改善了C/C复合材料的抗氧化性能。
In order to improve the high temperature oxidation resistance of C / C composites, SiC-MoSi2-WSi2 composites were prepared on the surface of C / C composites by polycarbosilane (PCS) impregnation cracking method and Si, Mo, Coating, by X-ray diffraction, scanning electron microscopy and other analytical means, the coating morphology, microstructure and phase analysis, optimization of coating preparation process, investigated the coating high temperature oxidation resistance, analysis of the Antioxidant mechanism. The prepared SiC-MoSi2-WSi2 composite coating has a thickness of about 200 μm, and is mainly composed of SiC, MoSi2 and WSi2. The results of 1 500 ℃ oxidation showed that the static oxidation loss rate of the composite coating was reduced by more than 50% compared with that of the SiC single layer coating, which greatly improved the oxidation resistance of the C / C composite.