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Study on the characterisation of the PTFE transfer film and the dimensional designing of surface texturing in a dry-lubricated bearing system
Wear ( IF 5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.wear.2020.203238
Liang Ding , Dragos Axinte , Paul Butler-Smith , Ali Abdelhafeez Hassan

Abstract The ability of polytetrafluoroethylene (PTFE) to form tribo-film in dry sliding condition makes it a popular liner material for self-maintenance bearings, such as those in the helicopter main and tail rotors. Nowadays, hard fillers or reinforcing-fibres are added to form the PTFE composite with enhanced strength and wear resistance; however, this also leads to increasing possibility of wear tracks on counter-surface and therefore more difficulty in observing and characterising the transfer film. In this paper, a surface analysis method based on using SEM analysis, supplemented with a Time-of-flight Secondary-ion mass spectrometry (Tof-SIMS) techniques for calibration was developed to give a comprehensive view of the transfer film formation on bearing steel surfaces. Previous challenges in transfer film identification and characterisation were also pinpointed. A series of laser surface textures (dimples), designed for improving the tribological performance of the bearing were tested, and the effects on transfer film formation have been evaluated by the surface analysis method. It is found that the depth of the dimples should match with the thickness of the transfer film to achieve a benefiting effect of the film formation, while the diameter and the coverage of the textures needs to be relatively small to avoid a high level of abrasion.

中文翻译:

干润滑轴承系统聚四氟乙烯转移膜特性及表面织构尺寸设计研究

摘要 聚四氟乙烯(PTFE)在干滑动条件下形成摩擦膜的能力使其成为一种流行的自维护轴承衬里材料,例如用于直升机主旋翼和尾旋翼的轴承。如今,通过添加硬质填料或增强纤维来形成具有增强强度和耐磨性的聚四氟乙烯复合材料;然而,这也导致在对应表面上出现磨损痕迹的可能性增加,因此更难以观察和表征转移膜。在本文中,开发了一种基于使用 SEM 分析的表面分析方法,辅以飞行时间二次离子质谱 (Tof-SIMS) 校准技术,以全面了解轴承钢上的转移膜形成。表面。还指出了先前在转移膜识别和表征方面的挑战。测试了一系列旨在改善轴承摩擦学性能的激光表面纹理(凹坑),并通过表面分析方法评估了对转移膜形成的影响。研究发现,凹坑的深度应与转移膜的厚度相匹配,以达到有利于成膜的效果,而纹理的直径和覆盖范围需要相对较小,以避免高水平的磨损。
更新日期:2020-05-01
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