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Carbon/carbon composites |
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Anti-oxidation coating |
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SiC |
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HUANG -Qizhong |
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Article by Huang,.Q |
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Influence of Preparation Technology on the Structure and Phase Composition of MoSi2-Mo5Si3/SiC Multi-coating for Carbon/Carbon Composites
Xin Yang1), Yanhong Zou2), Qizhong Huang1), Zhean Su1), Mingyu Zhang1), Xin Chang1), Zhiyong Xie1)
1) State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2) Materials Science and Engineering Post-doctoral Research Center, Central South University, Changsha 410083, China
Oxidation protective MoSi2-Mo5Si3/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 1 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.
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
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