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采用高温自蔓延合成了MoSi2粉末,经冷压和高温真空烧结成试样。在XP-5型高温摩擦磨损试验机上,考察了MoSi2与Al2O3陶瓷在1 000℃对摩时的摩擦磨损特性。通过带微探针的扫描电子显微镜(SEM)观察与分析了试样表面的磨损形貌及成分组成,并讨论了其磨损机理。结果表明,MoSi2的高温磨损过程存在跑合、过渡期和稳定磨损3个阶段,小于50 N时该材料具有较好的耐磨性;虽然粘着磨损普遍存在,但随着载荷的增大,MoSi2的磨损机理依次还表现出研磨、塑性变形与疲劳断裂。 相似文献
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<正>1.故障现象某型号13t全液压振动压路机振动钢轮行走支撑处发生漏油故障,继续使用过程中行走支撑处产生异响,最终发展为压路机不能行走。拆解行走支撑,发现行走支撑中的双列圆锥滚子轴承的外列圆锥滚子已散架,内列圆锥滚子也磨损严重,如图1所示。2.钢轮连接结构该振动压路机振动钢轮右端通过减速器6、 相似文献
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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. 相似文献
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油润滑下MoSi2材料的摩擦磨损性能 总被引:3,自引:0,他引:3
运用M-200型摩擦磨损试验机测定了油润滑条件下MoSi2与45调质钢、45淬火钢和CrWMn钢配对时的摩擦磨损性能,采用扫描电镜和微探针分析了摩擦副表面的形貌,探讨了磨损机理:结果表明:采用20号机械油润滑可有效地降低MoSi2材料的磨损率及摩擦因数;与低硬度的45调质钢和45淬火钢对摩时,MoSi2材料的主要磨损机制为晶间断裂、疲劳断裂、轻微粘着磨损和磨粒磨损;MoSi2材料与高硬度的CrWMn钢对摩时,主要磨损机制表现为粘着磨损、微犁削式磨粒磨损,并在偶件表面材料凸点的前端形成楔块。 相似文献
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