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Superlubricating materials can greatly reduce the energy consumed and economic losses by unnecessary friction. However, a long pre-running-in period is indispensable for achieving superlubricity; this leads to severe wear on the surface of friction pairs and has become one of the important factors in the wear of superlubricating materials. In this study, a polyethylene glycol-tannic acid complex green liquid lubricant (PEG10000-TA) was designed to achieve macroscale superlubricity with an ultrashort running-in period of 9 s under a contact pressure of up to 410 MPa, and the wear rate was only 1.19 × 10–8 mm3·N−1·m−1. This is the shortest running-in time required to achieve superlubricity in Si3N4/glass (SiO2). The results show that the strong hydrogen bonds between PEG and TA molecules can significantly reduce the time required for the tribochemical reaction, allowing the lubricating material to reach the state of superlubrication rapidly. Furthermore, the strong hydrogen bond can share a large load while fixing free water molecules in the contact zone to reduce shear interaction. These findings will help advance the use of liquid superlubricity technology in industrial and biomedical.


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Achieving macroscale superlubricity with ultra-short running-in period by using polyethylene glycol-tannic acid complex green lubricant

Show Author's information Changhe DU1,2Tongtong YU1,3Zishuai WU1Liqiang ZHANG1,3Ruilin SHEN1Xiaojuan LI1,2Min FENG1,2Yange FENG1,3Daoai WANG1,3( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China

Abstract

Superlubricating materials can greatly reduce the energy consumed and economic losses by unnecessary friction. However, a long pre-running-in period is indispensable for achieving superlubricity; this leads to severe wear on the surface of friction pairs and has become one of the important factors in the wear of superlubricating materials. In this study, a polyethylene glycol-tannic acid complex green liquid lubricant (PEG10000-TA) was designed to achieve macroscale superlubricity with an ultrashort running-in period of 9 s under a contact pressure of up to 410 MPa, and the wear rate was only 1.19 × 10–8 mm3·N−1·m−1. This is the shortest running-in time required to achieve superlubricity in Si3N4/glass (SiO2). The results show that the strong hydrogen bonds between PEG and TA molecules can significantly reduce the time required for the tribochemical reaction, allowing the lubricating material to reach the state of superlubrication rapidly. Furthermore, the strong hydrogen bond can share a large load while fixing free water molecules in the contact zone to reduce shear interaction. These findings will help advance the use of liquid superlubricity technology in industrial and biomedical.

Keywords: friction, superlubricity, running-in period, tannic acid, green lubricant

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DOI
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Received: 08 February 2022
Revised: 07 March 2022
Accepted: 02 June 2022
Published: 06 January 2023
Issue date: May 2023

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© The author(s) 2022.

Acknowledgements

The authors thank the National Natural Science Foundation of China (U21A2046, 51905518), the Program for Taishan Scholars of Shandong Province (TS20190965), the National Key R&D Program of China (2020YFF0304600), the Innovation Leading Talents Program of Qingdao (19–3–2–23-zhc) in China, the Key Research Program of the Chinese Academy of Sciences (XDPB24), the Western Light Project of CAS (xbzg-zdsys-202118), and the LICP Cooperation Foundation for Young Scholars (HZJJ21–03) for providing financial support.

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