Abstract The purpose of this research was to investigate the potential use of Cu–Ti3AlC2 composites sliding against a Cu–5%Ag alloy as a viable electrical contact couple. Sliding friction and wear tests were conducted in the presence of an electric current using a custom-designed block-on-ring wear testing apparatus. The electrical current density was 0–15 A/cm2 along with an apparent contact pressure of 1.25–7.5 N/cm2 and sliding velocities ranging from 2.5 to 15 m/s. The results indicate that friction coefficient, wear rate, and contact voltage drop measured for the sliding couple increases with an increase in the electrical current density. As the apparent contact pressure increases, the contact voltage drop of Cu–Ti3AlC2 composites increases gradually, while friction coefficient and wear rate first decrease and then increase. With an increase in the sliding velocity, the friction coefficient of the sliding pair decreases and the contact voltage drop increases gradually, while wear rate decreases first, then increases. Adhesive wear and arc erosion wear proposed as the main wear modes. A lubricating film was observed to form on the wear surfaces under each test condition, and that film apparently improves the tribological properties of the sliding couples.

中文翻译：

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电流密度、表观接触压力和滑动速度对Cu-Ti3AlC2复合材料电滑动磨损行为的影响

摘要 本研究的目的是研究在 Cu-5%Ag 合金上滑动的 Cu-Ti3AlC2 复合材料作为可行的电接触对的潜在用途。滑动摩擦和磨损测试是在电流存在下使用定制设计的块对环磨损测试设备进行的。电流密度为 0–15 A/cm2，表观接触压力为 1.25–7.5 N/cm2，滑动速度范围为 2.5 到 15 m/s。结果表明，滑动偶的摩擦系数、磨损率和接触电压降随着电流密度的增加而增加。随着表观接触压力的增加，Cu-Ti3AlC2复合材料的接触压降逐渐增加，而摩擦系数和磨损率先降低后增加。随着滑动速度的增加，滑动副的摩擦系数减小，接触电压降逐渐增大，而磨损率先减小后增大。粘着磨损和电弧侵蚀磨损被认为是主要的磨损模式。在每个测试条件下观察到在磨损表面上形成润滑膜，并且该膜明显改善了滑动偶的摩擦学性能。