Abstract
Anthracite sheets were coated by sorbitol fatty acid ester (span80) through ball-milling process. The tribological properties of the span80-coated anthracite sheets as the additive in polyalpha olefin were evaluated through a series of friction tests using a four ball machine. The results revealed that the span80-coated anthracite sheets exhibited excellent dispersion stability in base oil. In addition, compared with base oil, the average coefficient of friction, wear scar diameter, and wear volume of modified oil at a mass fraction of 0.03% span80-coated anthracite sheets decreased by 45.39%, 60.13%, and 95.95%, respectively. The oil containing span80-coated anthracite sheets achieved good friction-reducing and anti-wear effects over a wide range of applied loads, temperatures, or rotating speeds. Control experiments were performed as well. The results obtained using span80-coated anthracite sheets were superior to those obtained using pure anthracite. The lubrication mechanism was attributed to the synergistic action of the crystalline and amorphous carbon in anthracite sheets as they formed a protective film and played a mitigative role on the surface of friction pair, which mitigated the wear extent of the friction pair.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (No. 51373059), Science and Technology Projects in Fujian Province (Nos. 2017H2001, 2018H0019, and 2018H6012), Science and Technology Innovation Team of Huaqiao University (No. Z14X0046), Subsidized Project for Postgraduates’ Innovative Fund in Scientific Research of Huaqiao University, the Graphene Powder & Composite Research Center, Development and Reform Commission of Fujian Province.
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Hailong LIU. He received his bachelor degree in 2017 from Huaqiao University, Xiamen, China. After then, he was a master student in the Graphene Powder and Composite Engineering Center, Huaqiao University. He has recently obtained his master degree in chemical engineering. His research interests include nanomaterials and inorganic mineralogy.
Guohua CHEN. He received his bachelor, M.S., and Ph.D. degrees from Xiamen University, Jilin University, and Tianjin University, China, in 1984, 1987, and 1999, respectively. He joined in Huaqiao University in 1987. At present, he is a professor in College of Materials Science & Engineering, Huaqiao University. His research interests are mainly in the graphene preparation and application.
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Liu, H., Huang, Y., Wang, Y. et al. Study of tribological properties and lubrication mechanism of surfactant-coated anthracite sheets used as lubricant additives. Friction 9, 524–537 (2021). https://doi.org/10.1007/s40544-019-0357-4
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DOI: https://doi.org/10.1007/s40544-019-0357-4