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Research Article | Open Access | Online First

Surface wettability-driven oil film formation in slider-on-disc contact under limited lubrication

Zhaogang Jing1,2Yusheng Jian1Feng Guo1( )Penghao Duan2( )Pat Lam Wong2Ziying Li1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
Department of Mechanical Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong, China
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Abstract

The effects of tuned surface wettability on oil film formation in a hydrodynamically lubricated contact with a limited lubricant supply (LLS) were explored in this study. Using a slider-on-disc lubricating film test rig, the oil film thickness was measured for three surface wettability configurations: the original disc surface and original slider side surface (OD & OS), the anti-fingerprint (AF)-coated disc surface and original slider side surface (AFD & OS), and the AF-coated disc surface and the AF-coated slider side surface (AFD & AFS). The results indicate that the AFD & AFS combination maintains the largest oil film thickness. This enhanced performance is due to the oil’s nonwetting behavior on the AFD & AFS surfaces, particularly the discontinuous oil droplet/strip by dewetting, which promotes more lubricant supply at the slider inlet. Moreover, the oil accumulates at the inlet in the form of a convex reservoir so that positive Laplace pressure is generated, which effectively bears part of the load, and the film thickness increases.

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Friction
Cite this article:
Jing Z, Jian Y, Guo F, et al. Surface wettability-driven oil film formation in slider-on-disc contact under limited lubrication. Friction, 2025, https://doi.org/10.26599/FRICT.2025.9440990

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Received: 13 June 2024
Revised: 11 July 2024
Accepted: 20 August 2024
Published: 03 March 2025
© The Author(s) 2025.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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