(1.中南大學 材料科學與工程系，長沙 410083；
2.湘潭工學院 機械工程與自動化系，湘潭 411201)
摘 要: 在M-2型摩擦磨損試驗機上考察了MoSi2，RE/MoSi2和Mo5Si3/MoSi2等3種材料在干摩擦條件下與氧化鋁砂輪對摩時的磨粒磨損性能， 運用掃描電子顯微鏡和定點探針觀察與分析了其磨損表面形貌，并對材料的磨損機理進行了探討。結果表明：3種材料均具有較好的抗磨粒磨損特性；磨損機理主要為微切削、表面氧化和疲勞微斷裂；第二相稀土和Mo5Si3在一定程度上降低了基體的耐磨性，主要歸因于表面氧化生成膜的不同性質。
關鍵字: MoSi2；稀土；Mo5Si3；磨粒磨損；磨損機理
reinforced by rare earth and
Mo5Si3 under dry friction
（1.Department of Materials Science and Engineering,
Central South University, Changsha 410083, China；
2.Department of Mechanical Engineering and Automation,
Xiangtan Polytechnic University, Xiangtan 411201, China）
Abstract:The abrasive wear behaviors of MoSi2, rare-earth/MoSi2 and Mo5Si3/MoSi2 materials in sliding against Al2O3 grinding wheel under dry friction were investigated by using an M-2 abrasion wear tester. A scanning electron microscope with electron microprobe analyzers was used for the analysis and determination of the wear mechanisms. The results show that the three materials have excellent abrasive wear resistance. The abrasive wear of the MoSi2 matrix composites is governed by microcutting,oxidation on the surface and fatigue microcrack.The addition of rare earth or Mo5Si3 all increase the wear rate of MoSi2,which is attributed to the resultant generation of the oxide film changing on the worn ceramic surfaces.
Key words: MoSi2;rare earth;Mo5Si3;abrasive wear;wear mechanism
