SiC/Cu复合材料磨损界面研究

Research on the Attrition Interface of SiC/Cu Composite

采用非均相沉淀法制备了SiC/Cu包裹复合粉体,热压烧结制备SiC/Cu复合材料.以Si3N4球为摩擦副,在400℃条件下进行磨损实验.采用XRD、SEM分别对磨损前后材料的界面物相、磨损界面的形貌以及裂纹的扩展变化情况进行分析.结果表明:在该实验条件下,SiC/Cu复合材料界面的物相随着磨损的进行发生变化,Cu2O含量大大增加,同时出现CuO.随着循环荷载的增加,复合材料的内部产生了裂纹,裂纹的扩展是沿着SiC/Cu界面进行;而SiC颗粒的存在,使复合材料内部裂纹发生偏转,有利于提高材料的耐磨性.

Nanoscale SiC/Cu composite particles were prepared with the heterogeneous precipitation method. SiC/Cu composite material was obtained by hot-pressing. The wear experiment was carried out at 400℃. XRD was used to characterize the phase of hot-pressed composite before and after the wear test. SEM techniques were used to observe the morphology of the wear track and the propagation of cracks in the wear traces. The results indicated that, under the experimental condition, the phase of friction interface changed. The content of Cu2O increased and CuO appeared. With the circulation load increase, the crack was observed, and it car- ried on along the SiC/Cu interface. While the existence of SiC particles, which will prevent the crack expansion, is advantage ous to enhance the wear resistance of the compound material greatly.