Effect of Interfacial Properties on EHL Under Pure Sliding Conditions

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

19 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)31-38
Journal / PublicationTribology Letters
Volume49
Issue number1
Online published19 Sept 2012
Publication statusPublished - Jan 2013

Abstract

This paper presents an experimental study of the effect of boundary slip on the lubricating film shape and friction of an elastohydrodynamic lubrication (EHL) contact under isothermal conditions. Ball and disc pure sliding experiments were carried out with a high viscosity polybutene oil using a conventional optical EHL test rig. The film shape and friction were measured simultaneously. The results obtained from two discs with different coatings were compared. One disc was coated only with Cr, the partially reflective layer, and the other had an extra layer of SiO2 coating on top. When running under mild conditions of low load and speed, there was no evidence of any boundary slip effect. However, when the load increased, the Cr-coated disc produced lower film thickness and friction than the SiO2-coated disc. The Cr-coated surface had a larger contact angle, i.e.; smaller surface energy, than the SiO2 surface, which reflects the weak bonding between the molecules of the surface and the lubricant. The study concludes that surfaces with low surface energy promote boundary slip at the EHL contact, leading to a reduction in friction and film thickness.

Research Area(s)

  • Boundary slip, Dimple, Elastohydrodynamic lubrication, Interfacial effect, Stribeck curve

Citation Format(s)

Effect of Interfacial Properties on EHL Under Pure Sliding Conditions. / Fu, Z.; Wong, P. L.; Guo, F.
In: Tribology Letters, Vol. 49, No. 1, 01.2013, p. 31-38.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review