微米Wp/Cu基复合材料耐磨行为

Sliding Wear Behavior of Micrometer Wp/Cu Matrix Composite

以微米级的钨粉和铜粉为原料,采用冷压烧结方法制备出Wp/Cu基复合材料,并进行了热挤压加工,考察了该材料的耐磨行为。结果表明:该复合材料不仅具有良好的抗磨性能,而且适宜同40Cr钢组成在油润滑条件下工作的摩擦副;在油润滑条件下,其磨损体积损失仅是QSn6.5-0.4的11.6%,磨损表面呈Cu基体、凸出Wp和少量孔隙的耐磨组织,并且未发现来自40Cr钢的转移物。

A micrometer Wp/Cu matrix composite were fabricated by powder metallurgy, using micrometer Cu powder and micrometer W powder as the raw materials. The resulting composites specimens were hot extruded to increase compactness. The friction and wear behaviors of the composite were investigated. The results show that the composite exhibites an excellent wear--resistance. The wear volume loss is only 11.6 % of that popularly used 6.5-0.4 bronze bearing materials. An excellent wear-resistance microstructure consisting of copper matrix, W particle and a small amount of porosity is found in the composite wear surface, where no transfer of the counterpart steel wears debris characterized.