Influence of Preparation Technology on the Structure and Phase Composition of MoSi_2-Mo_5Si_3 /SiC Multi-coating for Carbon/Carbon Composites

作     者：Xin Yang Yanhong Zou Qizhong Huang Zhean Su Mingyu Zhang Xin Chang Zhiyong Xie 

作者机构：State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Materials Science and Engineering Post-doctoral Research Center Central South University Changsha 410083 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2010年第26卷第2期

页      面：106-112页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China under grant Nos. 50772134 and 50802115 the National Basic Research Program of China ("973 Program") under grant No. 2006CB600901 

主　　题：Carbon/carbon composites Anti-oxidation coating SiC 

摘      要：Oxidation protective MoSi2-MosSi3/SiC multi-coatings for carbon/carbon composites were prepared by chemical vapor reaction and slurry-sintering method. The influence of preparation technology on the structure and phase composition of the coating was investigated by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD） analyses, and then their relationship was discussed. The results indicate that the Si/Mo ratio of the slurry and sintering processing were two main factors that significantly affected the structure and phase composition of the multi-coating. Appropriate sintering process and relatively high Si/Mo ratio were essential for preparing the multi-coating with dense structure and favorable phase composition. After being sintered at 1723 K for 2 h and with the Si/Mo ratio of the slurry being 4.5 （weight ratio）, a dense structure accompanied by favorable phase composition of the coating can be obtained. When heat treated at 2373 K for I h, this coating became more compact and continuous. Oxidation tests （performed at 1623 and 1823 K） demonstrated that both of these two obtained multi-coatings exhibited better anti-oxidation property than single layer SiC coating.