Abstract
The layered double hydroxide (LDH) is a kind of natural mineral, which can also be manually prepared. It has been practically applied in various fields due to its unique crystal structure and diversity of composition, size, and morphology. In this work, LDHs with different chemical compositions (Co2+, Mg2+, Zn2+, and Ni2+) and topographical features (flower-like, spherical, and plate-like) were successfully prepared by controlling the reaction conditions. Then, they were mechanically dispersed into base grease and their tribological properties were evaluated by a ball-on-disk tester under a contact pressure of 2.47 GPa. It was found that the variation of morphology, instead of chemical composition, had great influence on the tribological performance. The “flower-like” LDH sample with high specific surface area (139 m2/g) was demonstrated to show the best performance. With 1 wt% additive, the wear volume was only about 0.2% of that lubricated by base grease. The tribofilm with unique microscopic structure and uniform composition was derived from tribochemical reaction between LDH additives and sliding solid surfaces, effectively improving tribological properties of the lubrication system. This work provided the guidance for optimizing lubricant additives and held great potential in future applications.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 51905294, 51905027, 51527901, and 51875303), China Postdoc Innovation Talent Support Program (No. BX20180168), and the China Postdoctoral Science Foundation (No. 2019M650654).
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Hongdong WANG and Yue WANG conducted the experiments. Hongdong WANG finished the main manuscript. All authors contributed to the analysis and discussion of the data, reviewed the manuscript, and have given approval to the final version of the manuscript.
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Hongdong WANG. He got his Ph.D. degree from State Key Laboratory of Tribology at Tsinghua University in 2018 and now is a postdoctor at Tsinghua University. His research topics focus on the water-based superlubricity and the application of two dimensional nanomaterials in tribology.
Yuhong LIU. She received her Ph.D. degree in Chinese Academy of Sciences Key Laboratory of Molecular Nanostructure & Nanotechnology Institute of Chemistry, CAS, Beijing, China, in 2005. She is an associate professor at the State Key Laboratory of Tribology of Tsinghua University, China, from 2005. Her research areas cover nanotribology, nanostructure, nanotechnology of surface and interface, chemicalmechanical planarization, and water-based lubrication.
Qiang WANG. He received the BEng degree (2003) and MEng degree (2005) from Harbin Institute of Technology in China, and the Ph.D. degree (2009) from POSTECH in South Korea. During 2009–2011, he worked as Research Fellow in the Institute of Chemical and Engineering Sciences under Agency for Science, Technology and Research (A*STAR), Singapore. During 2011?2012, he worked as postdoctoral associate in the Department of Chemistry, University of Oxford in United Kingdom. Since 2012, he has been a full professor position in the College of Environmental Science and Engineering, Beijing Forestry University. His research interests are environmental functional nanomaterials, particularly in CO2 capture and utilization, and catalytic removal of VOCs and NOx, etc.
Jianbin LUO. He received his BEng degree from Northeastern University in 1982, and MEng degree from Xi’an University of Architecture and Technology in 1988. In 1994, he received his Ph.D. degree from Tsinghua University and then joined the faculty of Tsinghua University. Prof. Luo is an academician of the Chinese Academy of Sciences and a Yangtze River Scholar Distinguished Professor of Tsinghua University, Beijing, China. He was awarded the STLE International Award (2013), the Chinese National Technology Progress Prize (2008), the Chinese National Natural Science Prize (2001), and the Chinese National Invention Prize (1996). Prof. Luo has been engaged in the research of thin film lubrication and tribology in nanomanufacturing. He was invited as a keynote or plenary speaker for 20 times on the international conferences.
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Tribological behavior of layered double hydroxides with various chemical compositions and morphologies as grease additives
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Wang, H., Wang, Y., Liu, Y. et al. Tribological behavior of layered double hydroxides with various chemical compositions and morphologies as grease additives. Friction 9, 952–962 (2021). https://doi.org/10.1007/s40544-020-0380-5
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DOI: https://doi.org/10.1007/s40544-020-0380-5