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Three types of nano-montmorillonite were doped as additives to afford lubricating greases. The physicochemical, insulating, and tribological performances of the obtained lubricating greases were investigated in detail. Furthermore, the tribological action mechanisms were analyzed by high magnification optical microscope, Raman spectroscopy, and energy dispersive X-ray spectroscope (EDS). The results show that the inorganic modification montmorillonite (IOMMT) can significantly increase the number of electron traps in the base grease, leading to excellent insulating performances. Moreover, IOMMT as a novel lubricant additive (1.5 wt% in grease) significantly enhances the friction reducing and anti-wear abilities for steel/steel contact that comprises a unique layered structure to prevent friction between the contact pairs and the protective tribofilm generated by physical adsorption and chemical reaction.


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Nano-montmorillonite-doped lubricating grease exhibiting excellent insulating and tribological properties

Show Author's information Zhengfeng CAOYanqiu XIA( )Xiang XI
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Abstract

Three types of nano-montmorillonite were doped as additives to afford lubricating greases. The physicochemical, insulating, and tribological performances of the obtained lubricating greases were investigated in detail. Furthermore, the tribological action mechanisms were analyzed by high magnification optical microscope, Raman spectroscopy, and energy dispersive X-ray spectroscope (EDS). The results show that the inorganic modification montmorillonite (IOMMT) can significantly increase the number of electron traps in the base grease, leading to excellent insulating performances. Moreover, IOMMT as a novel lubricant additive (1.5 wt% in grease) significantly enhances the friction reducing and anti-wear abilities for steel/steel contact that comprises a unique layered structure to prevent friction between the contact pairs and the protective tribofilm generated by physical adsorption and chemical reaction.

Keywords: friction and wear, nano-montmorillonite, insulation

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Publication history
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Publication history

Received: 28 October 2016
Revised: 13 January 2017
Accepted: 10 February 2017
Published: 12 May 2017
Issue date: June 2017

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© The author(s) 2017

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51575181) and Beijing Natural Science Foundation of China (No. 51575181).

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