Random point-contact between the space bearing retainer and the rolling elements may cause wear of the space bearing retainer. The paper aims to clarify the friction and wear behaviors of polyimide bearing retainer under point-contact condition.,Space bearing retainers were cut into flat specimens and the tribological behaviors of the specimens were studied under point-contact condition using a friction and wear testing machine. Different sliding velocities and normal loads were used to simulate the running state of space bearing retainer. The wear behaviors of the space bearing retainer were analyzed by SEM and white light interferometer.,The friction coefficient of the polyimide composites decreased with increase in sliding velocity from 1 to 5 mm/s. Moreover, with increase in sliding velocity and normal load, the wear rate of the polyimide composites decreased and increased, respectively. Moreover, the wear behaviors of the polyimide composites were mainly determined by the combined actions of ploughing friction and adhesive friction. The lubricating properties of transfer film and wear debris were limited under point-contact condition.,The paper includes implications for the understanding of the wear mechanism of the polyimide composites space bearing retainer under point-contact condition and then to optimize space bearing retainer materials further.,Under point-contact condition, wear debris can hardly participate in the friction process because of limited contact area. Consequently, the wear debris has limited impact on the wear process to decrease the friction and wear.,The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0017/

中文翻译：

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点接触条件下聚酰亚胺轴承保持架的摩擦磨损行为

空间轴承保持架和滚动元件之间的随机点接触可能会导致空间轴承保持架磨损。本文旨在阐明聚酰亚胺轴承保持架在点接触条件下的摩擦磨损行为。,将空间轴承保持架切割成平面试样，并利用摩擦磨损试验机研究了点接触条件下试样的摩擦学行为。 . 使用不同的滑动速度和法向载荷来模拟空间轴承保持架的运行状态。通过扫描电镜和白光干涉仪分析了空间轴承保持架的磨损行为。聚酰亚胺复合材料的摩擦系数随着滑动速度从1到5mm/s的增加而降低。此外，随着滑动速度和法向载荷的增加，聚酰亚胺复合材料的磨损率分别降低和增加。此外，聚酰亚胺复合材料的磨损行为主要由耕作摩擦和粘附摩擦的共同作用决定。点接触条件下转移膜和磨屑的润滑性能受到限制。,本文对理解聚酰亚胺复合材料空间轴承保持架在点接触条件下的磨损机理以及进一步优化空间轴承保持架材料具有启示意义。 .,在点接触条件下，由于接触面积有限，磨屑几乎不能参与摩擦过程。因此，磨屑对磨损过程的影响有限，以减少摩擦和磨损。这篇文章的同行评审历史可在：https://publons。