ABSTRACT Functionally graded Cu-10Sn-5Ni/10B4C composite was fabricated using horizontal centrifugal casting. Microstructural and mechanical properties were superior at reinforcement-rich inner zone where wear tests were conducted based on response surface methodology five-level run order, using pin on disc tribometer. Results showed that wear rate increases linearly with increase in load and sliding velocity whereas with increased sliding distance, it increases non-linearly with reduced slope. Minimum wear is observed at optimum combination of load (10 N), velocity (1 m/s) and sliding distance (500 m). Worn surfaces were analysed using scanning electron microscope to determine the wear mechanisms. Results concluded applied load as the major influential parameter over wear rate leading to occurrence of deep grooves along with delamination at higher loads and shallow grooves along the sliding direction at lower loads. Fabricated composite proves the ability to replace conventional materials for automotive sliding applications, providing improved wear characteristics at dry sliding conditions.

中文翻译：

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功能梯度铜复合材料的微观结构、力学和摩擦学分析

摘要 功能梯度 Cu-10Sn-5Ni/10B4C 复合材料是使用水平离心铸造制造的。微观结构和机械性能在富含钢筋的内部区域优越，其中磨损测试基于响应面方法五级运行顺序，使用盘式摩擦计的销钉进行。结果表明，磨损率随着载荷和滑动速度的增加而线性增加，而随着滑动距离的增加，磨损率随着斜率的减小而非线性增加。在负载 (10 N)、速度 (1 m/s) 和滑动距离 (500 m) 的最佳组合下观察到最小磨损。使用扫描电子显微镜分析磨损表面以确定磨损机制。结果得出结论，外加载荷是磨损率的主要影响参数，导致在较高载荷下出现深槽和分层，在较低载荷下沿滑动方向出现浅槽。制造的复合材料证明能够替代汽车滑动应用的传统材料，在干滑动条件下提供更好的磨损特性。