La_2O_3和WSi_2增强MoSi_2基复合材料的摩擦磨损性能研究  

Friction and Wear Behavior of La_2O_3- and WSi_2-Reinforced MoSi_2 Composite

作　　者：张厚安[1] 陈平[1] 颜建辉[1] 胡小平[1] 唐思文[1] 

机构地区：[1]湖南科技大学机械设备健康维护省重点实验室,湖南湘潭411201

出　　处：《摩擦学学报》2005年第3期230-233,共4页Tribology

基　　金：国家自然科学基金资助项目(50405041;50272015);湖南省自然科学基金资助项目(02JJY5003);湖南省教育厅资助项目(04C218).

摘　　要：选用MRH-5A型环-块摩擦磨损试验机测定了3种载荷和2种转速条件下La2O3和WSi2增强MoSi2基复合材料在滑动干摩擦时的摩擦磨损性能,采用扫描电子显微镜分析了复合材料磨损表面形貌.结果表明:La2O3和WSi2增强MoSi2基复合材料的抗磨性能优于MoSi2及WSi2/MoSi2材料;当载荷与速度乘积(pv)值小于183.04N·m/s时,La2O3和WSi2增强MoSi2基复合材料的磨损质量损失仅为相同条件下MoSi2的1/4～1/6和WSi2/MoSi2的1/2;这是由于La2O3和WSi2复合增强相存在硬化和韧化协同作用所致;随着pv值增加,La2O3和WSi2增强MoSi2基复合材料依次呈现犁削、粘着磨损和疲劳磨损特征.La_2O_3-WSi_2/MoSi_2 composite was prepared by self-propagating high-temperature synthesis and hot-press technique. The friction and wear behavior of the resulting composite sliding against AISI1045 steel in ambient condition was investigated using a ring-on-block type friction and wear tester, using MoSi_2 and WSi_2/MoSi_2 as the references. The worn surface morphologies of the composites were observed using a scanning electron microscope. Results showed that La_2O_3-WSi_2/MoSi_2 composite had much better wear resistance than MoSi_2 and WSi_2/MoSi_2, which was especially so at a pv value below 183.04 N·m/s. Namely, at a pv value below 183.04 N·m/s, the La_2O_3-WSi_2/MoSi_2 composite recorded a wear mass loss only one-fourth to one-sixth of that of MoSi_2 or half of that of WSi_2/MoSi_2, which was attributed to the combined hardening and toughening effects of the complex reinforcing agents La_2O_3 and WSi_2. Moreover, the La_2O_3-WSi_2/MoSi_2 composite was dominated by ploughing, adhesion wear, and fatigue wear as the pv value increased from a low level up to a much high level.

关 键 词：MOSI2基复合材料 LA2O3 WSi2 摩擦磨损性能 

分 类 号：TG148[一般工业技术—材料科学与工程] TH117.3[金属学及工艺—金属材料]