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Research Article | Open Access

Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions

Tomáš POLÁČEK( ), Petr ŠPERKA, Ivan KŘUPKA
Faculty of Mechanical Engineering, Brno University of Technology, Brno 61669, Czech Republic
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Abstract

Macroscale rolling/sliding conditions are in the superlubricity, a little-studied topic so far. The purpose of this paper is to examine the formation of elastohydrodynamic lubrication (EHL) films by water-based lubricants (glycerol and polyethylene glycol (PEG)), providing superlubricous friction. Experiments were carried out on an optical ball-on-disc tribometer under rolling/sliding conditions. The film thickness was measured by the thin film colorimetric interferometry, and the viscosity of liquids was measured by rotational and high-pressure falling body viscometers. The results show that tribochemical reactions are not the mandatory reason for friction to reach the superlubricity level when using the water-based lubricants. The studied liquids themselves are almost Newtonian. With the addition of water, the signs of shear thinning behavior disappear even more. Suitable conditions for this type of lubricant can be predicted using the known Hamrock–Dowson equations. An anomaly in the thickness of the lubricants was observed as an abrupt change at certain conditions. The more PEG there is in the lubricant, the higher the thickness at the beginning of the jump.

Keywords

macroscale superlubricitysuper low tractionwater-based lubricantselastohydrodynamic lubrication (EHL)film thickness

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Friction
Volume 12 Issue 1,
January 2024
Pages 164-173
DOI: 10.1007/s40544-023-0762-6
Cite this article:
POLÁČEK T, ŠPERKA P, KŘUPKA I. Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions. Friction, 2024, 12(1): 164-173. https://doi.org/10.1007/s40544-023-0762-6

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Received: 08 November 2022
Revised: 14 January 2023
Accepted: 21 March 2023
Published: 28 July 2023
© The author(s) 2023.

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