Cu-纳米TiB_2原位复合材料的摩擦磨损性能  

Dry Sliding Friction and Wear Behavior of Cu-Nanosized TiB_2 In-situ Composites

作　　者：王耐艳[1] 涂江平[1] 杨友志[1] 齐卫笑[1] 卢焕明[2] 郭绍仪[3] 刘茂森[1] 

机构地区：[1]浙江大学材料科学与工程系,浙江杭州310027 [2]浙江大学硅材料国家重点实验室,浙江杭州310027 [3]浙江工程学院机械工程系,浙江杭州310033

出　　处：《摩擦学学报》2002年第6期414-418,共5页Tribology

基　　金：国家自然科学基金资助项目(500071055);浙江省自然科学基金资助项目(500042);教育部留学回国人员科研启动基金资助项目(2000-367);中科院兰州化学物理研究所固体润滑国家重点实验室资助项目(0004).

摘　　要：采用销-盘式摩擦磨损试验机考察了Cu-纳米TiB2原位复合材料在滑动干摩擦条件下的磨损行为.结果表明:载荷和滑动速度对纳米TiB2颗粒原位增强Cu基复合材料的摩擦磨损性能有重要影响;随着载荷的增加,Cu-纳米TiB2原位复合材料的磨损率和摩擦系数增大;由于在较高载荷下发生表面开裂,TiB2增强相含量较高的原位复合材料的磨损由轻度磨损向严重磨损转化;在中等载荷下,表面保护性氧化膜和基体中纳米TiB2相使复合材料具有良好的抗软化能力,Cu-纳米TiB2原位复合材料的磨损率和摩擦系数随着滑动速度的增加而降低;在较高滑动速度下,复合材料的主要磨损机制为塑性流变和氧化磨损.The friction and wear behavior of Cu-nanosized TiB2 in-situ composites in dry sliding against Cu-graphite composite was investigated on a pin-on-disk test rig. It was found that the friction and wear characteristics of the Cu-nanosized TiB2 in-situ composite were closely dependent on the applied load and the sliding speed. The wear rate and the friction coefficient of the in-situ composite increased with the increase of the applied load. Owing to the interfacial cracking under a higher applied load, the wear of the composite with high content of TiB2 would transit from the mild wear to severe one over the applied load range from 10 N to 80 N. Under a moderate applied load, the wear rate and the friction coefficient of the in-situ composite decreased with the increase of the sliding speed, which was attributed to the formation of a protective oxide film on the sliding surface and the reinforcement of nanosized TiB2 particles in the Cu matrix. The later made the hardness of the subsurface layer maintained and the strength of the composite maintained as well at the increased temperature of the sliding surface under a relatively higher sliding speed. The Cu-nanosized TiB2 in-situ composite was dominated by plastic flow and oxidation wear in sliding against the Cu-graphite composite at a higher sliding speed.

关 键 词：Cu-纳米TiB2原位复合材料 原位复合材料 摩擦磨损性能 

分 类 号：TB333[一般工业技术—材料科学与工程]