| 滑动速率对La2O3–MoSi2与SiC摩擦副的高温摩擦磨损行为的影响 |
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| 引用本文： | 古思勇,张厚安,时存.滑动速率对La2O3–MoSi2与SiC摩擦副的高温摩擦磨损行为的影响[J].硅酸盐学报,2012(6):879-882. |
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| 作者姓名： | 古思勇 张厚安 时存 |
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| 作者单位： | 厦门理工学院材料制备与应用技术研究所;郑州电力高等专科学校 |
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| 基金项目： | 国家自然科学基金(51071133);福建省自然科学基金(2010-J01313)资助项目 |
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| 摘 要： | 在XP-5高温摩擦磨损试验机上考察了La2O3–MoSi2与SiC摩擦副在1 000℃、30 N载荷以及不同滑动速率下的摩擦磨损行为。利用扫描电子显微镜和X射线衍射仪分析了La2O3–MoSi2复合材料和SiC的磨损表面形貌与相组成。结果表明:La2O3–MoSi2与SiC摩擦副的摩擦因数随滑动速率的增加而减小,在滑动速率为0.084 m/s时,La2O3–MoSi2复合材料磨损率最大;0.126 m/s时磨损率最小。其磨损机理除氧化磨损之外,还表现为黏着磨损、研磨和疲劳点蚀。SiC的磨损率随滑动速率的增加而减小,始终表现为磨损质量增加,这归因于氧化质量增加大于磨损质量损失。
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| 关 键 词： | 二硅化钼 氧化镧 碳化硅 磨损 摩擦 滑动速率 |
Effect of Sliding Speed on Friction and Wear Behavior of La2O3–MoSi2 Composite–SiC Friction Couples at High Temperature |
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| Affiliation: | GU Siyong1,ZHANG Houan1,SHI Chun2(1.Institute of Material Preparation and Applied Technology,Xiamen University of Technology,Xiamen 361024,Fujian,China; 2.Zhengzhou Electric Power College,Zhengzhou 450004,China) |
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| Abstract: | The friction and wear behavior of La2O3–MoSi2 composite–SiC friction couples at 1 000 ℃ and under a load of 30 N at different sliding speeds were investigated via a mode XP-5 high temperature friction and wear testing machine.The worn surfaces and phase composition of those materials were analyzed by scanning electron microscope and X-ray diffraction,respectively.The results showed that the friction factor of La2O3–MoSi2–SiC friction couples decreased with the increase of sliding speed.The wear rate of La2O3–MoSi2 composite was greatest at a sliding speed of 0.084 m/s,and the lowest at 0.126 m/s.The wear mechanisms of La2O3–MoSi2 composite involved oxidation,adhesion wear,abrasion and fatigue pitting.The wear rate of SiC decreased with the increase of sliding speed,indicating a wear phenomenon of mass gain during the wear process due to the mass gain oxidation rather than the mass wear loss. |
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| Keywords: | molybdenum disilicide lanthanum oxide silicon carbide wear friction sliding speed |
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