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Friction 2020, 8(4): 674-683 https://doi.org/10.1007/s40544-019-0290-6
Research Article | Open Access | Issue | Published: 11 May 2019

Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions

Show Author's Information Kuiliang GONG1,2,  Wenjing LOU1,3,  Gaiqing ZHAO1,3,  Xinhu WU1,3( ),  Xiaobo WANG1,3( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China
Qingdao Center of Resource Chemistry&New Materials, Qingdao 266000, China
Keywords:
lubricant additive, ionic liquids, MoS2 and WS2 quantum dots, friction reduction and anti-wear, severe conditions
Cite this article:
GONG K, LOU W, ZHAO G, et al. Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions. Friction, 2020, 8(4): 674-683. https://doi.org/10.1007/s40544-019-0290-6
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Abstract Full text About this article

Despite excellent tribological behaviors of ionic liquids (ILs) as lubricating oils, their friction-reducing and anti-wear properties must be improved when they are used under severe conditions. There are only a few reports exploring additives for ILs. Here, MoS2 and WS2 quantum dots (QDs, with particle size less than 10 nm) are prepared via a facile green technique, and they are dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm]PF6), forming homogeneous dispersions exhibiting long-term stabilities. Tribological test results indicate that the addition of MoS2 and WS2 QDs in the IL can significantly enhance the friction-reducing and anti-wear abilities of the neat IL under a constant load of 500 N and a temperature of 150 ℃. The exceptional tribological properties of these additives in the IL are ascribed to the formation of protective films, which are produced not only by the physical absorption of MoS2 and WS2 QDs at the steel/steel contact surfaces, but also by the tribochemical reaction between MoS2 or WS2 and the iron atoms/iron oxide species.


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About this article

Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions

Show Author's information Kuiliang GONG1,2, Wenjing LOU1,3, Gaiqing ZHAO1,3, Xinhu WU1,3( ), Xiaobo WANG1,3( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China
Qingdao Center of Resource Chemistry&New Materials, Qingdao 266000, China

Abstract

Despite excellent tribological behaviors of ionic liquids (ILs) as lubricating oils, their friction-reducing and anti-wear properties must be improved when they are used under severe conditions. There are only a few reports exploring additives for ILs. Here, MoS2 and WS2 quantum dots (QDs, with particle size less than 10 nm) are prepared via a facile green technique, and they are dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm]PF6), forming homogeneous dispersions exhibiting long-term stabilities. Tribological test results indicate that the addition of MoS2 and WS2 QDs in the IL can significantly enhance the friction-reducing and anti-wear abilities of the neat IL under a constant load of 500 N and a temperature of 150 ℃. The exceptional tribological properties of these additives in the IL are ascribed to the formation of protective films, which are produced not only by the physical absorption of MoS2 and WS2 QDs at the steel/steel contact surfaces, but also by the tribochemical reaction between MoS2 or WS2 and the iron atoms/iron oxide species.

Keywords: lubricant additive, ionic liquids, MoS2 and WS2 quantum dots, friction reduction and anti-wear, severe conditions

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Publication history

Received: 10 December 2018
Revised: 04 March 2019
Accepted: 18 March 2019
Published: 11 May 2019
Issue date: August 2020

Copyright

© The author(s) 2019

Acknowledgements

The authors are thankful for financial support of this work by National Key Research and Development Program of China (No. 2018YFB0703802) and National Natural Science Foundation of China (Nos. NSFC51875553 and 51775536).

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