This study fabricated textures on the stator surface of a traveling wave ultrasonic motor (USM) using laser and investigated the tribological behavior of a polytetrafluoroethylene (PTFE) composite friction material and stator. Initially, the effect of textures with different densities was tested. As the results suggested, the generation of large transfer films of PTFE composite was prevented by laser surface texturing, and adhesive wear reduced notably despite the insignificant decrease in load capacity and efficiency. Next, the 100-h test was performed to further study the effects of texture. Worn surface and wear debris were observed to discuss wear mechanisms. After 100 h, the form of wear debris changed into particles. The wear mechanisms of friction material sliding against the textured stator were small size fatigue and slight abrasive wear. The wear height of friction material decreased from 3.8 μm to 1.1 μm. This research provides a method to reduce the wear of friction materials used in travelling wave USMs. Friction 8(2): 301-310 (2020) | https://mc03.manuscriptcentral.com/friction Jinbang LI. He received his M.S. and Ph.D degrees in mechanical engineering from Harbin Institute of Technology, Harbin, China, in 2011 and 2016, respectively. He joined the School of Mechanical Engineering and Mechanics at Ningbo University from 2016. His research areas cover the tribological problems in ultrasonic motors, the development of polymer-based friction material and the effect of laser surface texturing on friction and wear of materials.
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