High-temperature wear behaviors of MoSi2 under different loads
(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)
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