Effect of laser surface texturing on tribological properties of polyimide composites in the application of traveling wave rotary ultrasonic motor
Abstract
Purpose
The purpose of this paper is to investigate the effect of laser surface texturing on the tribological properties of polyimide composites and the output performance of traveling wave rotary ultrasonic motor.
Design/methodology/approach
The surface texturing on polyimide composites specimens were fabricated by laser ablation process of different dimple densities, and then the tribological properties were tested by a flat-on-flat tribometer under dry conditions. Finally, the output performance of the traveling wave rotary ultrasonic motor was tested to verify the effectiveness of dimples surface texturing.
Findings
The results show that surface texturing can greatly enhance the friction coefficient of contact interface, especially the specimen with a dimple density of 7.06 per cent exhibited the highest friction coefficient among the specimens. When the input voltage is 500 V, the output power, locked-rotor torque and output torque of ultrasonic motor with textured PI of 7.06 per cent dimple density as friction material at the speed of 100 r/min increased by 13.8, 19 and 12.8 per cent compared to that of the untextured PTFE, respectively. When the ultrasonic motor reverses, the output performance is increased by 20.9, 40.3 and 17.7 per cent, respectively.
Originality/value
Surface texturing is an effective way to improve the friction behavior of polyimide composites and then correspondingly enhance the energy conversion efficiency and output performance of the traveling wave rotary ultrasonic motor.
Keywords
Acknowledgements
This work is supported by the Major State Basic Research Development Program of China (973 Program, Grant No. 2015CB057501) and National Natural Science Foundation of China (51403101).
Citation
Liu, X., Zhao, G. and Qiu, J. (2018), "Effect of laser surface texturing on tribological properties of polyimide composites in the application of traveling wave rotary ultrasonic motor", Industrial Lubrication and Tribology, Vol. 70 No. 4, pp. 569-577. https://doi.org/10.1108/ILT-06-2016-0130
Publisher
:Emerald Publishing Limited
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