SPS制备Cu-石墨-Ti3AlC2复合材料的摩擦学性能和微观结构演变

Tribological Properties and Microstructure Evolution of Cu-Graphite-Ti3AlC2 Composites Fabricated by SPS

摘要:

将Ti₃AlC₂添加到铜-石墨复合材料中以提高其摩擦学性能，研究了烧结温度对放电等离子烧结制备的铜-石墨-Ti₃AlC₂复合材料（CGTCs）的微观结构、密度、硬度、电导率、界面性能和摩擦学行为等性能的影响。结果表明，Ti₃AlC₂和Cu在烧结过程中相互扩散，产生冶金结合。此外，源自Ti₃AlC₂的钛原子与石墨表面上的碳原子发生反应，促进了Cu和石墨的强结合。CGTCs在不同烧结温度下表现出良好的润滑性能，摩擦系数在0.15至0.25之间，磨损率随着烧结温度的升高先降低后增加，在980 ℃下获得了最佳的摩擦学性能，平均摩擦系数和磨损率分别为0.18和4.82×10^-6 mm³·(N·m)^-1。

Abstract:

Ti₃AlC₂ was added into Cu-graphite composites to enhance their tribological properties. The impact of sintering temperature on properties of Cu-graphite-Ti₃AlC₂ composites (CGTCs) fabricated by spark plasma sintering (SPS) was studied, including microstructure, density, hardness, electrical conductivity, interfacial properties, and tribological behavior. The results indicate that mutual diffusion between Ti₃AlC₂ and Cu occurs during sintering, leading to metallurgical bonding. Moreover, titanium atoms originating from Ti₃AlC₂ undergo a reaction with carbon atoms on the graphite surface, facilitating enhanced bonding between Cu and graphite. CGTCs exhibit promising lubrication performance at different sintering temperatures, with friction coefficients ranging from 0.15 to 0.25. The wear rate decreases and then increases with the increase of sintering temperature. Optimal tribological properties are achieved at 980 °C, when the average friction coefficient and wear rate are 0.18 and 4.82×10^-6 mm³·(N·m)^-1, respectively.