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Appl. Sci. 2017, 7(10), 996;

Elastohydrodynamic Performance of a Bio-Based, Non-Corrosive Ionic Liquid

Division of Machine Elements, Department of Engineering Science and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden
Georgia Institute of Technology, Centre for High Pressure Rheology, G.W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405, USA
Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325, USA
Author to whom correspondence should be addressed.
Received: 30 August 2017 / Revised: 22 September 2017 / Accepted: 25 September 2017 / Published: 27 September 2017
(This article belongs to the Section Mechanical Engineering)
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To improve performance of machine components, lubrication is one of the most important factors. Especially for use in extreme environments, researchers look for other solutions rather than common lubricant base stocks like mineral oils or vegetable oils. One such example is ionic liquids. Ionic liquids have been defined as molten salts with melting points below 100 C that are entirely ionic in nature, comprising both cationic and anionic species. The industrial use of ionic liquids is mostly as solvents, electrolytes, extractants and catalysts. In tribological applications, ionic liquids are mainly studied in boundary lubrication and in pure sliding contacts. In this work, the elastohydrodynamic performance of a bio-based, non-corrosive, [choline][l-proline] ionic liquid is evaluated in terms of pressure-viscosity response, film forming capability and friction. The results show a pressure-viscosity coefficient of below 8 GPa 1 at 25 C, among the lowest reported for any ionic liquid. The ionic liquid generated up to 70% lower friction than a reference paraffin oil with a calculated difference in film thickness of 11%. It was also shown that this ionic liquid is very hygroscopic, which is believed to explain part of the low friction results, but also has to be considered in practical applications since the water content will influence the properties and thus the performance of the lubricant. View Full-Text
Keywords: Ionic liquid; EHL; friction; film thickness; bio-based; non-corrosive; pressure-viscosity; elastohydrodynamic Ionic liquid; EHL; friction; film thickness; bio-based; non-corrosive; pressure-viscosity; elastohydrodynamic

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Björling, M.; Bair, S.; Mu, L.; Zhu, J.; Shi, Y. Elastohydrodynamic Performance of a Bio-Based, Non-Corrosive Ionic Liquid. Appl. Sci. 2017, 7, 996.

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