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Superlubricity in EHL Contacts with Water-Containing Gear Fluids

Gear Research Centre (FZG), Technical University of Munich (TUM), Boltzmannstraße 15, 85748 Garching near Munich, Germany
Author to whom correspondence should be addressed.
This paper is an extended version of an abstract published in European Conference on Tribology, Vienna, Austria, 12–14 June 2019.
Lubricants 2019, 7(5), 46;
Received: 24 April 2019 / Revised: 20 May 2019 / Accepted: 24 May 2019 / Published: 27 May 2019
(This article belongs to the Special Issue Gear Tribology)
PDF [4638 KB, uploaded 29 May 2019]


Fluid friction in elastohydrodynamically lubricated (EHL) contacts depends strongly on the lubricant considered. Synthetic oils can have significantly lower fluid friction than mineral oils. Water-containing fluids have the potential to significantly reduce fluid friction further. The aim of this study is to investigate the film formation and frictional behavior of highly-loaded EHL contacts with water-containing fluids. Comparisons are made with mineral and polyalphaolefin oils. Measurements at an optical EHL tribometer show good lubricant film formation of the considered water-containing gear fluids. Measurements at a twin-disk test rig show coefficients of friction smaller than 0.01, which is referred to as superlubricity, for all considered operating conditions. View Full-Text
Keywords: EHL; friction; superlubricity; gear; water-containing fluids EHL; friction; superlubricity; gear; water-containing fluids

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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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Yilmaz, M.; Mirza, M.; Lohner, T.; Stahl, K. Superlubricity in EHL Contacts with Water-Containing Gear Fluids. Lubricants 2019, 7, 46.

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