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采用包埋法和料浆涂刷法在C/C复合材料表面制备C/SiC/MoSi2-SiC-Si抗氧化复合涂层。通过扫描电镜(SEM)、电子能谱(EDS)以及X射线衍射(XRD)等测试手段对涂层的微观结构、元素分布及晶相组成进行分析,研究涂层试件在1873K静态空气下的抗氧化性能。结果表明:制备的复合涂层主要由MoSi2、SiC和Si构成;其在1873K静态空气下有效保护C/C复合材料达200h,带涂层的C/C复合材料试样氧化失重率仅为3.25%。涂层试样的氧化失重主要是由于涂层表面SiO2的挥发及裂纹、孔洞等缺陷的形成引起的。
C / SiC / MoSi2-SiC-Si anti-oxidation composite coating was prepared on the surface of C / C composites by embedding method and slurry coating method. The microstructure, elemental distribution and crystal phase composition of the coating were analyzed by scanning electron microscopy (SEM), electron spectroscopy (EDS) and X-ray diffraction (XRD) Antioxidant properties. The results show that the prepared composite coatings are mainly composed of MoSi2, SiC and Si. The C / C composites can effectively protect the C / C composites for 200 h under static air of 1873K. The oxidative weight loss of the coated C / C composites is only 3.25 %. Oxidative weight loss of the coating sample is mainly caused by the evaporation of SiO 2 on the coating surface and the formation of defects such as cracks and holes.