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为提高炭/炭(C/C)复合材料的抗高温燃气冲刷性能,分别采用包埋法、化学气相沉积法和料浆法在其表面制备了三层涂层。借助扫描电镜、电子能谱等测试手段对涂层试样的微观结构进行了分析,同时研究了涂层C/C复合材料在高温风洞环境中的抗冲刷性能,并分析了涂层在燃气冲刷环境下的失效原因。结果表明:三层涂层由MoSi2-SiC-Si多相内涂层、SiC中间层和玻璃外涂层构成,其厚度分别为80μm,20μm和80μm。该复合涂层可在1500℃风洞环境下对C/C复合材料有效保护53h。涂层在高温风洞中防氧化失效是由于涂层在热冲击以及承受气流冲击的恶劣环境下开裂引起的。
In order to improve the high-temperature gas scouring performance of C / C composites, three coatings were prepared on the surface by embedding method, chemical vapor deposition method and slurry method respectively. The microstructure of the coating samples was analyzed by means of scanning electron microscopy, electron spectroscopy and other testing methods. At the same time, the anti-erosion properties of the coating C / C composites in high temperature wind tunnel environment were studied. Erosion causes of erosion under the environment. The results show that the three-layer coating is composed of MoSi2-SiC-Si multi-phase inner coating, SiC intermediate layer and glass outer coating, and their thicknesses are 80μm, 20μm and 80μm respectively. The composite coating can effectively protect the C / C composite for 53h in a wind tunnel environment of 1500 ℃. Coatings Anti-oxidation failures in high temperature wind tunnels are caused by cracking of the coating in harsh environments that are subject to thermal shock and to impingement of the air stream.