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