Abstract Anodisation of pure aluminium under certain conditions, form nanoporous alumina (NPA) with highly ordered pores. High interface strength and hardness make NPA an ideal tribological coating. The nanopores can be filled with metals using electrodeposition to give rise to a nanocomposite coating with better tribological properties. In this study, the friction and wear behaviour of NPA and copper filled nanocomposite coatings are studied under dry reciprocation conditions with a hard zirconia ball. The coefficient of friction of NPA and the nanocomposite is found to be about 0.95. Wear particles are generated by the propagation of surface microcracks and possibly by compaction. From the SEM images of the wear tracks, it is found that these wear particles form a protective tribolayer. The wear process of the coatings is characterised by three distinct regimes of constant wear rate, low wear, and catastrophic failure. The coating fails, possibly by radial cracking, when the thickness of the unworn coating reaches a critical value. Uniform filling of copper in the nanopores is found to enhance the wear life.

中文翻译：

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纳米多孔氧化铝和铜填充纳米复合涂层的磨损特性

摘要 纯铝在一定条件下阳极氧化形成具有高度有序孔隙的纳米多孔氧化铝（NPA）。高界面强度和硬度使 NPA 成为理想的摩擦涂层。可以使用电沉积用金属填充纳米孔，以产生具有更好摩擦学性能的纳米复合涂层。在这项研究中，研究了 NPA 和铜填充纳米复合涂层在干往复条件下与硬氧化锆球的摩擦和磨损行为。发现 NPA 和纳米复合材料的摩擦系数约为 0.95。磨损颗粒是由表面微裂纹的传播和可能通过压实产生的。从磨损痕迹的 SEM 图像可以看出，这些磨损颗粒形成了保护性摩擦层。涂层的磨损过程具有恒定磨损率、低磨损和灾难性失效三种不同的状态。当未磨损涂层的厚度达到临界值时，涂层失效，可能是由于径向开裂。发现在纳米孔中均匀填充铜可以提高磨损寿命。