Preparation and Structure of MoSi2-Mo5Si3/SiC Multi-coating for Carbon/Carbon Composites

doi:10.3724/SP.J.1077.2008.00779

Abstract

Abstract: To prevent carbon/carbon composites from oxidation, a MoSi₂-Mo₅Si₃/SiC multi-coating was prepared by the
chemical vapor reaction (CVR) technique and slurry method. The formation mechanism and structure of the multi-coating were studied by using XRD, SEM and EDS analysis, and then the anti-oxidation property of the multi-coating was investigated. The results show that the thickness of obtained coating is about 400μm, and the main phase are composed of β-SiC, MoSi₂ and Mo₅Si₃. After oxidation in air at 1350℃ for 10h, the weight loss of the multi-coating is only 1.21%, which is obviously lower than that of single-layer SiC coating. The phases of MoSi₂ and Mo₅Si₃formed in the MoSi₂-Mo₅Si₃/SiC multi-coating fill the cracks and holes in the monolayer SiC coating, which can improve the anti-oxidation ability of the multi-coating. So the multi-coating made by the complex technology possesses more compact structure and better anti-oxidation property.

Key words: carbon/carbon composites, anti-oxidation coating, MoSi₂, SiC

CLC Number:

TB332

YANG XIN,ZOU Yan-Hong,HUANG Qi-Zhong,SU Zhe-An,WANG Xiu-Fei,ZHANG Ming-Yu. Preparation and Structure of MoSi₂-Mo₅Si₃/SiC Multi-coating for Carbon/Carbon Composites[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00779.

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Preparation and Structure of MoSi₂-Mo₅Si₃/SiC Multi-coating for Carbon/Carbon Composites

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