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Lubricants 2014, 2(4), 177-192; doi:10.3390/lubricants2040177

Influence of Temperature on the Frictional Properties of Water-Lubricated Surfaces

Department of Mechanical Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
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Received: 10 July 2014 / Revised: 12 August 2014 / Accepted: 10 September 2014 / Published: 15 October 2014
(This article belongs to the Special Issue Bio and Bio-Inspired Lubricants)
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Abstract

The influence of temperature on the lubricating properties of neat water for tribopairs with varying bulk elasticity moduli and surface hydrophilicity, namely hard-hydrophobic interface (h-HB), hard-hydrophilic interface (h-HL), soft-hydrophobic interface (s-HB), and soft-hydrophilic interface (s-HL), has been investigated. With increasing temperature, the coefficients of friction generally increased due to the decreasing viscosity of water. This change was more clearly manifested from soft interfaces for more feasible formation of lubricating films. Nevertheless, dominant lubrication mechanism appears to be boundary and mixed lubrication even for soft interfaces at all speeds (up to 1200 mm/s) and temperatures (1 to 90 °C) investigated. The results from this study are expected to provide a reference to explore the temperature-dependent tribological behavior of more complex aqueous lubricants, e.g., those involving various additives, for a variety of tribosystems. View Full-Text
Keywords: aqueous lubrication; temperature; soft; hard; hydrophilic; hydrophobic aqueous lubrication; temperature; soft; hard; hydrophilic; hydrophobic
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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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MDPI and ACS Style

Røn, T.; Lee, S. Influence of Temperature on the Frictional Properties of Water-Lubricated Surfaces. Lubricants 2014, 2, 177-192.

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