Influence of Preparation Technology on the Structure and Phase Composition of MoSi2-Mo5Si3/SiC Multi-coating for Carbon/Carbon Composites

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (2): 106-112.

• Thin Film and Coatings • Previous Articles Next Articles

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

Received:2008-07-08 Revised:2008-12-31 Online:2010-02-28 Published:2010-02-28
Contact: Qizhong Huang
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

Abstract

Abstract:

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.

Key words: Carbon/carbon composites, Anti-oxidation coating, SiC

Xin Yang, Yanhong Zou, Qizhong Huang, Zhean Su, Mingyu Zhang, Xin Chang, Zhiyong Xie. Influence of Preparation Technology on the Structure and Phase Composition of MoSi₂-Mo₅Si₃/SiC Multi-coating for Carbon/Carbon Composites[J]. J Mater Sci Technol, 2010, 26(2): 106-112.

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Influence of Preparation Technology on the Structure and Phase Composition of MoSi₂-Mo₅Si₃/SiC Multi-coating for Carbon/Carbon Composites

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