Friction and Wear Properties of Copper/Polyimide Resin Matrix Composite Coordinated Modified by SiC and WS₂ Particles

Copper/polyimide resin matrix composites with a total mass fraction of 20% SiC and WS₂ were prepared by powder metallurgy, and the mass ratios of WS₂ to SiC were 1：3, 3：5, 1：1, 5：3, and 3：1, respectively. The effect of the mass ratio of solid lubricant WS₂ and reinforced phase SiC on the micromorphology and friction and wear properties of the composites was studied. The results show that when the mass ratio of WS₂ to SiC was 3：5, a core-shell structure with WS₂ particles as the core and SiC particles as the shell began to form in the composite. With increasing the mass ratio of WS₂ to SiC, the core-shell structure changed from flat to circular, and its number and area increased; the friction and wear properties increased first and then decreased, and the wear mechanism changed from abrasive wear to fatigue wear, and finally to severe abrasive wear. When the mass ratio of WS₂ to SiC was 5：3, the friction and wear properties of the composite were the best.