Abstract Reduction of friction and wear is a key aspect in saving materials and energy of moving components. The tribological mechanism response for the ultralow frictional behaviors should be paid enough attention. In the present work, the polyimide (PI) composites were obtained by in-situ adding with multiwalled carbon nanotubes (CNTs). It is disclosed that the incorporation of CNTs enhanced the strength, modulus and hardness of PI matrix. Besides, in tests with sliding against bearing steel (GCr15) surface, PI composite adding with only 1.0 wt.% of CNTs exhibited the ultralow low friction coefficient (0.05) and specific wear rate (1.0 × 10−6 mm3/Nm), which were reduced by 90.7 % and 82.0 % compared to pure PI, respectively. Comprehensive characterization evidenced that a nanostructure tribofilm comprising carbon nanospheres and graphene nanosheets was established when sliding occurred with PI composites due to the tore and unwrapped of CNTs released onto the sliding interface. It was believed that the digest CNTs and tribo-chemical products continuously fed into the tribofilm enhanced its lubricity and load carrying capacity. Moreover, this work provides a strategy for developing high-performance polymer-on-metal sliding pairs with regard to reducing friction and wear through tailoring interface nanostructures.

中文翻译：

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通过调整摩擦膜纳米结构显着改善聚酰亚胺复合材料的摩擦学性能

摘要 减少摩擦和磨损是节省运动部件材料和能源的关键方面。超低摩擦行为的摩擦学机制响应应引起足够的重视。在目前的工作中，聚酰亚胺 (PI) 复合材料是通过原位添加多壁碳纳米管 (CNT) 获得的。据公开，CNT的掺入提高了PI基体的强度、模量和硬度。此外，在与轴承钢 (GCr15) 表面滑动的测试中，仅添加 1.0 wt.% CNTs 的 PI 复合材料表现出超低摩擦系数 (0.05) 和比磨损率 (1.0 × 10−6 mm3/Nm)，即与纯 PI 相比，分别降低了 90.7% 和 82.0%。综合表征表明，当 PI 复合材料发生滑动时，由于碳纳米管的撕裂和展开释放到滑动界面上，形成了包含碳纳米球和石墨烯纳米片的纳米结构摩擦膜。据信，消化后的 CNT 和摩擦化学产品连续进料到摩擦膜中，增强了其润滑性和承载能力。此外，这项工作为开发高性能聚合物-金属滑动副提供了一种策略，通过定制界面纳米结构来减少摩擦和磨损。据信，消化后的 CNT 和摩擦化学产品连续进料到摩擦膜中，增强了其润滑性和承载能力。此外，这项工作为开发高性能聚合物-金属滑动副提供了一种策略，通过定制界面纳米结构来减少摩擦和磨损。据信，消化后的 CNT 和摩擦化学产品连续进料到摩擦膜中，增强了其润滑性和承载能力。此外，这项工作为开发高性能聚合物-金属滑动副提供了一种策略，通过定制界面纳米结构来减少摩擦和磨损。