Abstract
We prepared a graphene/ionic liquid (G/IL) composite material by the hybridization of G and an IL for use as a lubricating oil additive. The friction coefficient and wear volume of a base oil containing 0.04 wt% of the G/IL composite was reduced by 45% and 90%, respectively. Furthermore, the base oil containing the G/IL composite exhibited better lubricating properties than the base oil containing G, IL, or a mixture of IL and G at the same mass fraction. A synergistic lubrication mechanism was also revealed. The G/IL composite was adsorbed and deposited on the wear surface, forming a more ordered protective film and a unique tribochemical reaction film during rubbing. Therefore, the G/IL composite exhibited the synergistic lubricating effects of G and IL, which significantly improved the lubricating performance of the base oil. This study also suggested a way to limit the out-of-plane puckering of G at the macroscale.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 12062002), Guangxi Natural Science Foundation (Grant No. 2018GXNSFAA138174), and the Science and Technology Development Plan of Liuzhou (No. 2018CB10508).
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Lincong LIU. He received his B.S. degree in mechatronic engineering in 2017 from Harbin University of Science and Technology and his M.S. degree from Guangxi University of Science and Technology in 2020. His research interests include liquid-phase lubrication and micro-tribology.
Ming ZHOU. She is a professor and a master supervisor at School of Mechanical Engineering, Guangxi University of Science and Technology. She graduated from Tsinghua University in 2007 and obtained her Ph.D. degree in 2013 from State Key laboratory of Tribology, Tsinghua University. She is invited to be a lecturer of the “Applied Technology Talents Training Project of Made in China 2025 Plan” by the Ministry of Industry and Information Technology. Her research interest is the regulation and application of mechanical interface behavior based on new materials. She has published over 21 papers in well-known international and domestic journals and 16 papers are included in SCI cited over 300 times. She has received the Outstanding Award for Excellent Mechanical Engineering Doctoral Thesis of the Society of Mechanical Engineering of China, the first prize of the outstanding doctoral thesis of Tsinghua University, and the promising academic young person of China Academy of Engineering Physics. She is also selected as the “BaGui area Young Scholars of Guangxi”.
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Liu, L., Zhou, M., Mo, Y. et al. Synergistic lubricating effect of graphene/ionic liquid composite material used as an additive. Friction 9, 1568–1579 (2021). https://doi.org/10.1007/s40544-020-0442-8
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DOI: https://doi.org/10.1007/s40544-020-0442-8