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Copper-graphite composites find extensive application as electrical contact materials. However, their tribological properties are limited by the weak interfacial bonding. In this study, Ti 3 AlC 2 was used to modify copper-graphite composites fabricated by vacuum sintering. The incorporation of Ti 3 AlC 2 included both coated Cu and uncoated Cu. The hardness, relative density, tribological properties, and microstructure of the composites were thoroughly investigated. The results show that the addition of Ti 3 AlC 2 coated with Cu was conducive to avoiding the agglomeration of Ti 3 AlC 2 particles, and resulting in superior relative density, hardness, lubrication and wear resistance of the composites. Furthermore, the incorporation of Ti 3 AlC 2 not only enhanced the presence of lubricating components in copper-graphite composites but also improved the interface bonding strength between the copper matrix and graphite. Specifically, Cu-graphite-Ti 3 AlC 2 (Cu-coated) composites displayed a relative density of 92%, a hardness of 94.2 HV, a friction coefficient of 0.175, and a wear rate of 1.28 × 10−6 mm3/N·m. • Graphite and Ti 3 AlC 2 were used to synergistically reinforce copper matrix composites. • The microstructure and properties of Cu-graphite-Ti 3 AlC 2 composites were investigated. • The interfacial bonding between copper and graphite was improved. [ABSTRACT FROM AUTHOR]

Copper/graphite composites and copper/graphite/Ti 2 SnC composites were fabricated through the process of ball-milling, pressing and sintering. The effects of Ti 2 SnC as the second lubrication component on the mechanical properties, wear resistance and lubrication properties of copper/graphite composites were studied in this paper. The results showed that copper/graphite/Ti 2 SnC composites had better hardness, impact toughness, wear resistance and lubrication performance than copper/graphite composites. The optimum values of hardness, impact toughness, friction coefficient and wear rate of copper/graphite/Ti 2 SnC composites were, respectively, 56 HSD, 1.8J/cm2, 0.15, 9.126 × 10−6 mm3/N·m, while these were only 45 HSD, 1.2 J/cm2, 0.17, 3.534 × 10−4 mm3/N·m of copper/graphite composites. [ABSTRACT FROM AUTHOR]

Cu/graphite composites are widely used in various fields as friction materials. However, their tribological properties are limited by the inadequate wettability between Cu and graphite and the insufficient strength of the Cu matrix. To strengthen Cu/graphite composites and improve their interface bonding, this investigation employed Cr 2 AlC to modify Cu/graphite composites fabricated by spark plasma sintering (SPS). The microstructure, interface characteristics, and tribological properties of the composites were thoroughly examined. The results show that the composites exhibit favorable tribological properties, which improved with the increase in sintering temperature. Specifically, as the sintering temperature increases from 800 °C to 980 °C, the friction coefficient of the composites decreases from 0.170 to 0.138, while the wear rate decreases from 9.92 × 10−7 mm3/N·m to 1.86 × 10−7 mm3/N·m. [ABSTRACT FROM AUTHOR]