以Cf/SiC复合材料为基体, 采用原位反应法制备了MoSi2-SiC-Si涂层, 借助XRD、扫描电镜及能谱对涂层的结构及组成进行了分析研究, 并考查了其高温抗氧化性能. 结果表明, 涂层总厚度约120μm, 主要由MoSi2、SiC和Si组成. MoSi2-SiC-Si涂层具有优异的高温抗氧化性能, 在1500℃静态空气中氧化96h, 涂层试样失重仅1.8%. 涂层试样失重的主要原因是由于氧气通过涂层中的贯穿性裂纹与Cf/SiC复合材料基体发生了反应.
A MoSi2-SiC-Si coating was prepared by in situ reaction method. The phase composition and microstructure of the coating were studied by using XRD,SEM and EDS analysis, and then the anti-oxidation property of the coating was investigated. The results show that the thickness of obtained coating is about 120μm, and the main phases are composed of MoSi2, SiC and Si. The MoSi2-SiC-Si coating has excellent anti-oxidation property, which can protect Cf/SiC composites from oxidation at 1500℃ in air for 96h, the weight loss of the coated samples is only 1.8%. The weight loss of the coated Cf/SiC composites samples is primarily due to the reaction of Cf/SiC composites substrate and oxygen diffusing through the penetration cracks in the coating.
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