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The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts

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Title: The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts
Authors: De Laurentis, N
Cann, P
Lugt, P
Kadiric, A
Item Type: Journal Article
Abstract: This study investigates the influence of base oil type and viscosity on the frictional behaviour of lithium-thickened bearing greases. A series of model lithium greases were manufactured by systematically varying viscosity and type of base oil, so that the influence of a single base oil property could be studied in isolation. In addition, selected greases were blended with oleic acid, with the purpose of evaluating its effectiveness in further reducing grease friction. Friction coefficient and film thickness were measured in laboratory ball-on-disc tribometers over a range of speeds and temperatures. For a specific oil type, the influence of base oil viscosity on friction was found to be closely related to its effect on film thickness: greases formulated with PAO oils covering a wide range of viscosities gave very similar friction at the same nominal film thickness. For a given base oil viscosity, base oil type was found to have a strong influence on grease friction under all test conditions. PAO-based greases generally produced lower friction than mineral- and ester-based greases. Addition of oleic acid to the test greases did not significantly affect friction within the range of test conditions employed in this study. The results provide new insight into the frictional behaviour of greases, which may be used to help inform new low-friction grease formulations for rolling bearing applications.
Issue Date: 28-Aug-2017
Date of Acceptance: 8-Aug-2017
URI: http://hdl.handle.net/10044/1/50556
DOI: https://dx.doi.org/10.1007/s11249-017-0908-7
ISSN: 1023-8883
Publisher: Springer Verlag
Journal / Book Title: Tribology Letters
Volume: 65
Copyright Statement: © The Author(s) 2017. This article is an open access publication
Sponsor/Funder: Commission of the European Communities
SKF (UK) Ltd
Funder's Grant Number: PIAP-GA-2013-612306
Keywords: 0912 Materials Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Open Access location: https://link.springer.com/article/10.1007/s11249-017-0908-7
Article Number: 128
Appears in Collections:Mechanical Engineering