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Research Article | Open Access

Tribological properties of conductive lubricating greases

Xiaoqiang FAN1,2, Yanqiu XIA1( ), Liping WANG1
State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou,730000, China
University of Chinese Academy of Sciences, Beijing100039, China
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Abstract

Three kinds of new conductive lubricating greases were prepared using lithium ionic liquids as the base oil and the polytetrafluoroethylene (PTFE) as the thickener. These lithium ionic liquids ([Li(PEG)X]) were obtained by blending lithium salts (LiBF4, LiPF6 and LiNTf2) with poly(ethylene glycol) (PEG) because lithium salts have an extremely high solubility in PEG. The conductivities and contact resistances of the prepared lubricating greases were investigated using the DDSJ-308A conductivity meter and the reciprocating ball-on-disk UMT-2MT sliding tester. In addition, their tribological properties were investigated in detail. Scanning electron microscopy and X-ray photoelectron spectroscopy were employed to explore the friction mechanisms. The results suggest that the prepared lubricating greases have high conductivities and excellent tribological properties. The high conductivities are attributed to ion diffusion or migration of the lithium ionic liquids with an external electric field, and the excellent tribological properties depend on the formation of boundary protective films.

Keywords

ionic liquidsgreaseconductivitytribology

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Friction
Volume 2 Issue 4,
December 2014
Pages 343-353
DOI: 10.1007/s40544-014-0062-2
Cite this article:
FAN X, XIA Y, WANG L. Tribological properties of conductive lubricating greases. Friction, 2014, 2(4): 343-353. https://doi.org/10.1007/s40544-014-0062-2

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Received: 26 May 2014
Revised: 14 July 2014
Accepted: 14 August 2014
Published: 21 October 2014
© The author(s) 2014

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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