SiC/Cu;  composite materials;  wear interface;  Crack propagation

SiC/Cu coated composite powder was prepared by heterogeneous precipitation, and SiC/Cu composites were prepared by hot pressing and sintering. Si3N4 ball was used as the friction pair, and the wear test was carried out at 400 °C. XRD and SEM were used to analyze the interface phase, morphology and crack propagation changes of materials before and after wear. The results show that under these experimental conditions, the phase of the SiC/Cu interface changes with the wear, the Cu2O content is greatly increased, and CuO appears. With the increase of cyclic load, cracks are generated inside the composite, and the crack propagation is carried out along the SiC/Cu interface. The presence of SiC particles deflects the internal cracks of the composite, which is conducive to improving the wear resistance of the material.