Abstract
A magnetic ionic liquid (abridged as MIL) [C6mim]5[Dy(SCN)8] was prepared and used as the magnetic lubricant of a steel-steel sliding pair. The tribological properties of the as-prepared MIL were evaluated with a commercially obtained magnetic fluid lubricant (abridged as MF; the mixture of dioctyl sebacate and Fe3O4, denoted as DIOS-Fe3O4) as a control. The lubrication mechanisms of the two types of magnetic lubricants were discussed in relation to worn surface analyses by SEM-EDS, XPS, and profilometry, as well as measurement of the electric contact resistance of the rubbed steel surfaces. The results revealed that the MIL exhibits better friction-reducing and antiwear performances than the as-received MF under varying test temperatures and loads. This is because the MIL participates in tribochemical reactions during the sliding process, and forms a boundary lubrication film composed of Dy2O3, FeS, FeSO4, nitrogen-containing organics, and thioether on the rubbed disk surface, thereby reducing the friction and wear of the frictional pair. However, the MF is unable to form a lubricating film on the surface of the rubbed steel at 25 °C, though it can form a boundary film consisting of Fe3O4 and a small amount of organics under high temperature. Furthermore, the excessive Fe3O4 particulates that accumulate in the sliding zone may lead to enhanced abrasive wear of the sliding pair.
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Acknowledgements
We acknowledge the financial support provided by the National Natural Science Foundation of China (Grant Nos. 51605143, 21671053, 51775168, and 51875172) and the Scientific and Technological Innovation Team of Henan Province Universities (Grant No. 19IRTSTHN024).
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Jiajia JIA. She received her bachelor degree in 2016 in Nanyang Normal University, China. After then, she is a master graduate student in the Engineering Research Center for Nanomaterials, Henan University, China. Her interests include the design and preparation of novel ionic liquids as lubricant and lubricating additives.
Guangbin YANG. He received his Ph.D. degree in condensed matter physics in 2011 from Henan University, China. Now he is an associate professor at Henan University. His research areas cover the nanotribology, the lubricants, and nano-additives. He has published more than 50 journal papers and possessed two ministerial and provincial-level science and technology awards.
Chunli ZHANG. She received her Ph.D. degree in polymer chemistry and physics in 2013 from Henan University, China. Now she is an associate professor at Henan University, China. Her research interests include the design and preparation of functionalized ionic liquids as lubricant and lubricating additives, nanotribology and nano-additives.
Shengmao ZHANG. He received his Ph.D. degree in physical chemistry from Lanzhou Institute of Chemical Physics of the Chinese Academy of Science in 2004, China. Now he is a professor at Henan University, China. His current research interests include nanoparticle lubricant additives, high performance lubricants and functional materials, and the tribology of materials. He has published more than 90 journal papers and holds 16 Chinese patents.
Yujuan ZHANG. She received her Ph.D. degree in physical chemistry in 2004 from Lanzhou Institute of Chemical Physics of the Chinese Academy of Science, China. Now she is an associate professor at Henan University, China. Her current research interests include nanoparticle lubricant additives, functional materials, and the tribology of materials.
Pingyu ZHANG. He is a professor and the director of the Engineering Research Center for Nanomaterials in Henan University, China. He received his Ph.D. degree from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences in 2000, China. His current research interests cover nanoparticle lubricant additives, high performance lubricants and functional materials, and the tribology of materials. He has published over 100 journal papers and gained a number of ministerial and provincial-level science and technology awards.
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Effects of magnetic ionic liquid as a lubricant on the friction and wear behavior of a steel-steel sliding contact under elevated temperatures
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Jia, J., Yang, G., Zhang, C. et al. Effects of magnetic ionic liquid as a lubricant on the friction and wear behavior of a steel-steel sliding contact under elevated temperatures. Friction 9, 61–74 (2021). https://doi.org/10.1007/s40544-019-0324-0
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DOI: https://doi.org/10.1007/s40544-019-0324-0