摘要
C/SiC/MoSi2-SiC-Si oxidation protective multilayer coating for carbon/carbon （C/C） composites was prepared by pack cementation and slurry method. The microstructure, element distribution and phase composition of the as-received coating were analyzed by scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that the multilayer coating was composed of MoSi2, SiC and Si. It could effectively protect C/C composites against oxidation for 200 h with the mass loss of 3.25% at 1873 K in static air. The mass loss of the coated C/C composites results from the volatilization of SiO2 and the formation of cracks and bubble holes in the coating.
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。
基金
Projects(51272213,51221001)supported by the National Natural Science Foundation of China
Project(73-QP-2010)supported by the Research Fund of the State Key Laboratory of Solidification Processing(NWPU)
Project(B08040)supported by Program of Introducing Talents of Discipline to Universities,China
作者简介
Corresponding author： He-jun LI; Tel： ＋86-29-88495004; Fax： ＋86-29-88492642; E-mail： lihejun@nwpu.edu.cn
