【摘要】 采用粉末冶金法制备了碳化钨颗粒增强铜(WC/Cu)复合材料,研究了WC含量对WC/Cu)复合材料力学性能和微结构的影响,并考察了复合材料载流摩擦磨损性能。结果表明:随着WC质量分数增加,复合材料相对密度逐渐降低,硬度缓慢增大,电导率快速下降。WC含量较低时,大部分WC颗粒能较均匀分布于铜基体上;而WC含量较高时,WC颗粒的团聚现象较严重,团聚所形成的颗粒团体积较大。载流摩擦磨损测试中,随着WC质量分数增加,体积磨损率逐渐减小;未加载电流时,体积磨损率随载荷增大而增大;一定载荷和滑动速率时,复合材料体积磨损率随载流密度增加而增大。更多还原

【Abstract】 WC particle reinforced Cu composites were prepared by powder metallurgy method. The effects of WC content on microstructure,mechanical properties and wear resistance of the composites under electrical current were investigated. The results indicate that with the increasing WC contents,the relative density of the composites gradually increases and the microhardness slightly improves whereas the electrical conductivity is sharply reduced. The WC particles are homogeneously dispersed in the Cu matrix for the composites with lower content of WC. When the WC content increasing,the agglomeration of the WC particles coccurs and the sizes of these agglomerates tended to be larger. The increase of WC content results in the decrease of the volume wear rate when the wear tests are performed under the electrical current. Without electrical current,the volume wear rate increases with the increasing of the load. The volume wear rate increases with the increasing electrical current density as the tests are carried out with specific load and sliding velocity.更多还原