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Erschienen in: Tribology Letters 2/2014

01.02.2014 | Original Paper

Friction Reduction in Elastohydrodynamic Contacts by Thin-Layer Thermal Insulation

verfasst von: M. Björling, W. Habchi, S. Bair, R. Larsson, P. Marklund

Erschienen in: Tribology Letters | Ausgabe 2/2014

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Abstract

Reducing friction is of utmost importance to improve efficiency and lifetime of many products used in our daily lives. Thin hard coatings like diamond-like carbon (DLC) have been shown to reduce friction in full-film-lubricated contacts. In this work, it is shown that contrarily to common belief, the friction reduction stems mainly from a thermal phenomenon and not only a chemical/surface interaction one. It is shown that a few micrometer-thin DLC coating can significantly influence the thermal behavior in a lubricated mechanical system. The presented simulations, validated by experiments, show that applying a thin DLC coating to metal surfaces creates an insulating effect that due to the increased liquid lubricant film temperature at the center of the contact, locally reduces lubricant viscosity and thus friction. The results of the investigation show that the addition of thin insulating layers could lead to substantial performance increases in many applications. On a component level, the contact friction coefficient in some common machine components like gears, rolling element bearings, and cam followers can potentially be reduced by more than 40 %. This will most likely open up the way to new families of coatings with a focus on thermal properties that may be both cheaper and more suitable in certain applications than DLC coatings.

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Metadaten
Titel
Friction Reduction in Elastohydrodynamic Contacts by Thin-Layer Thermal Insulation
verfasst von
M. Björling
W. Habchi
S. Bair
R. Larsson
P. Marklund
Publikationsdatum
01.02.2014
Verlag
Springer US
Erschienen in
Tribology Letters / Ausgabe 2/2014
Print ISSN: 1023-8883
Elektronische ISSN: 1573-2711
DOI
https://doi.org/10.1007/s11249-013-0286-8

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