Interactions between organic friction modifier additives

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Benjamin M. Fry
  • Mang Yin Chui
  • Gareth Moody
  • Janet S.S. Wong

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number106438
Journal / PublicationTribology International
Volume151
Online published31 May 2020
Publication statusPublished - Nov 2020

Abstract

The interactions of different additives in engine oils can create synergistic or antagonistic effects. This paper studies how mixing different organic friction modifier additives affects friction reducing properties of lubricants in the boundary lubrication regime. Amines of different degree of saturation were mixed with either glycerol monooleate (GMO) or oleic acid in hexadecane. The model lubricants thus formed were characterised with Fourier-transform infrared spectroscopy. Friction tests in reciprocating motion using ball-on-disc steel-steel contacts were conducted to examine the tribological performance of these lubricants. Worn surfaces were examined using X-ray photoelectron spectroscopy. Oleic acid and oleylamine, a primary amine, were found to form a partial ionic liquid, providing synergistic friction reduction. This positive interaction reduces with increasing degree of saturation of the amine. No synergistic effect was observed between GMO and oleylamine, suggesting that GMO does not hydrolyse into a carboxylic acid within a rubbing contact in the presence of amine.

Research Area(s)

  • Additives, Boundary lubrication, Friction

Citation Format(s)

Interactions between organic friction modifier additives. / Fry, Benjamin M.; Chui, Mang Yin; Moody, Gareth; Wong, Janet S.S.

In: Tribology International, Vol. 151, 106438, 11.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review