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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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High-temperature wear behaviors of MoSi2 under different loads
HU Xiao-ping(胡小平)1,2, TAN Wei-cheng(谭伟成)1, TANG Si-wen(唐思文)2,
ZHANG Hou-an(张厚安) 2, HUANG Zhi-chu(黄之初)1

1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Advanced Materials Synthesis and Applied Technology Laboratory, Hunan University of Science and Technology, Xiangtan 411201, China

Abstract:MoSi2 was prepared by SHS, pressed at room-temperature and then vacuum sintered at 1 500 ℃ for 1 h. The tribological properties of MoSi2 against Al2O3 were investigated by using an XP-5 type High Temperature Friction and Wear Tester. Micrographs and phases of the worn surface of MoSi2 were observed by SEM with EDS and X-ray diffraction. The results show that the wearing process of MoSi2 at high temperature exists three stages: running-in, interim and steady periods. MoSi2 exhibits preferable wear resistance when the load is lower than 50 N. Adhesion and oxidation wear exists widely at elevated temperature; however besides these, with increasing the load, the main wear mechanisms of MoSi2 could be changed from adhesion, plastic forming to fatigue fracture in turn.

 

Key words: MoSi2; tribological property; wear mechanism

ISSN 1672-7029
CN 43-1423/U

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