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Research Article | Open Access

Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases

Lu HUANG1,2, Dan GUO2( ), Xiang LIU1,2, Guoxin XIE2, George T Y WAN2, Shizhu WEN2
National Institute of Metrology, Beijing 100029, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100086, China
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Abstract

The mechanism of grease replenishment in and around a starved point contact was studied in this work. Greases made of different thickeners and same base oil were tested and compared. Disappearing and re-formation of a dynamic grease reservoir during operation revealed that grease bled oil to replenish contact. However, the replenishment process was slow because of the presence of grease fingers along the track and thickener-deposited film inside the track. The contact angles of base oil on the chromium-coated surface and thickener-deposited surfaces were measured. Results proved that the contact angle on the deposited film remarkably increased compared with that on the chromium-coated surface from 25° to more than 40°. However, the deposited film could be consumed with continuous rolling, and replenishment was then enhanced.

Keywords

greasestarvationthickenerdeposited filmreplenishmentcontact angle

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Friction
Volume 4 Issue 4,
December 2016
Pages 313-323
DOI: 10.1007/s40544-016-0123-9

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Cite this article:
HUANG L, GUO D, LIU X, et al. Effects of nano thickener deposited film on the behaviour of starvation and replenishment of lubricating greases. Friction, 2016, 4(4): 313-323. https://doi.org/10.1007/s40544-016-0123-9

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Received: 02 March 2016
Revised: 06 June 2016
Accepted: 25 July 2016
Published: 23 December 2016
© The author(s) 2016

This article is published with open access at Springerlink.com

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.