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Friction

, Volume 4, Issue 4, pp 313–323 | Cite as

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
Open Access
Research Article
  • 459 Downloads

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

grease starvation thickener deposited film replenishment contact angle 

Notes

Acknowledgement

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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Copyright information

© The author(s) 2016

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.

Authors and Affiliations

  • Lu Huang
    • 1
    • 2
  • Dan Guo
    • 2
  • Xiang Liu
    • 1
    • 2
  • Guoxin Xie
    • 2
  • George T. Y. Wan
    • 2
  • Shizhu Wen
    • 2
  1. 1.National Institute of MetrologyBeijingChina
  2. 2.State Key Laboratory of TribologyTsinghua UniversityBeijingChina

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