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Friction 2021, 9(5): 952-962 https://doi.org/10.1007/s40544-020-0380-5
Research Article | Open Access | Issue | Published: 20 May 2020

Tribological behavior of layered double hydroxides with various chemical compositions and morphologies as grease additives

Show Author's Information Hongdong WANG1,  Yue WANG1,2,  Yuhong LIU1( ),  Jun ZHAO1,3,  Jinjin LI1,  Qiang WANG4( ),  Jianbin LUO1( )
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
School of Mechanical Engineering, Guizhou University, Guiyang 550025, China
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
Keywords:
tribological property, lubricant additive, grease, graphene oxide, layered double hydroxide
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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, 2021, 9(5): 952-962. https://doi.org/10.1007/s40544-020-0380-5
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Abstract Full text Electronic supplementary material About this article

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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Electronic supplementary material
About this article

Tribological behavior of layered double hydroxides with various chemical compositions and morphologies as grease additives

Show Author's information Hongdong WANG1, Yue WANG1,2, Yuhong LIU1( ), Jun ZHAO1,3, Jinjin LI1, Qiang WANG4( ), Jianbin LUO1( )
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
School of Mechanical Engineering, Guizhou University, Guiyang 550025, China
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

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.

Keywords: tribological property, lubricant additive, grease, graphene oxide, layered double hydroxide

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Publication history

Received: 20 September 2019
Revised: 31 December 2019
Accepted: 03 March 2020
Published: 20 May 2020
Issue date: October 2021

Copyright

© The author(s) 2020

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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