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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 1    February 2005

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Morphology and structure of high temperature MoSi2 coating on niobium
XIAO Lai-rong(肖来荣), YI Dan-qing(易丹青),
YIN Lei(殷 磊),  CAI Zhi-gang(蔡志刚)

College of Materials Science and Engineering, Central South University,
Changsha 410083, China

Abstract:The high-temperature oxidation-resistant MoSi2 coating on the Nb substrate was prepared by slurry firing. The structure, compositions and phase distribution of the coating and the relationship between these features and the oxidation resistance of the coating were investigated by SEM, EDS and XRD. The results indicate that the interface between the coating and the substrate has metallurgic combination, and a transitional layer is formed by diffusion. The multi-layer structure improves the oxidation resistance of the coating. The method of slurry firing to prepare the high-temperature MoSi2 coating on Nb is feasible. The SiO2 scale, which is formed on the surface of the coating by the self-oxidation of MoSi2, prevents the further diffusion of oxygen.

 

Key words: Nb; high temperature oxidation resistance; MoSi2; coating

ISSN 1672-7029
CN 43-1423/U

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