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

Lu HUANG; Dan GUO; Xiang LIU; Guoxin XIE; George T Y WAN; Shizhu WEN

doi:10.1007/s40544-016-0123-9

Friction 2016, 4(4): 313-323 https://doi.org/10.1007/s40544-016-0123-9

Research Article |

Open Access | Issue | Published: 23 December 2016

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

Show Author's Information Hide Author's Information Lu HUANG^{¹^,²}, Dan GUO^²(

), Xiang LIU^{¹^,²}, Guoxin XIE^², George T Y WAN^², Shizhu WEN^²

¹ National Institute of Metrology, Beijing 100029, China

² State Key Laboratory of Tribology, Tsinghua University, Beijing 100086, China

Keywords:

starvation, replenishment, grease, thickener, deposited film, contact angle

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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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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.

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About this article

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

Show Author's information Hide Author's Information Lu HUANG^{¹^,²}, Dan GUO^²(

), Xiang LIU^{¹^,²}, Guoxin XIE^², George T Y WAN^², Shizhu WEN^²

¹ National Institute of Metrology, Beijing 100029, China

² State Key Laboratory of Tribology, Tsinghua University, Beijing 100086, China

Abstract

Keywords: starvation, replenishment, grease, thickener, deposited film, contact angle

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Publication history

Received: 02 March 2016

Revised: 06 June 2016

Accepted: 25 July 2016

Published: 23 December 2016

Issue date: June 2021

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (Nos. 51375255 and 51321092). The authors also would like to thank Shenzhen Hecheng Lubricant Co. for supplying the special lab-made grease samples.

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This article is published with open access at Springerlink.com

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