Title

Modification of boundary lubrication by oil-soluble friction modifier additives

Authors

Yingxi Zhu, University of Illinois Urbana-Champaign
Hiroko Ohtani, Ford Motor Company
Michael L. Greenfield, University of Rhode IslandFollow
Marina Ruths, Åbo Akademi University
Steve Granick, University of Illinois Urbana-Champaign

Document Type

Article

Date of Original Version

8-1-2003

Abstract

The molecular-level function of model and commercial friction modifier additives in lubricants of the type used at the wet clutch interface in automatic transmissions has been studied using a surface forces apparatus (SFA) modified for oscillatory shear. The nanorheological properties of tetradecane with and without a model friction modifier additive (1-hexadecylamine) were examined in the boundary lubrication regime and compared to a fully-formulated automatic transmission fluid (ATF). 1-Hexadecylamine adsorbed as a single layer on the sliding surfaces, reduced the static frictional force and the limiting shear stress, and eliminated the stick-slip transition that exists in pure tetradecane. The ATF, which contains commercial-grade friction modifiers, showed nanorheological properties similar to those observed for tetradecane containing 0.1-0.2 wt% 1-hexadecylamine.

Publication Title, e.g., Journal

Tribology Letters

Volume

15

Issue

2

Citation/Publisher Attribution

Zhu, Yingxi, Hiroko Ohtani, Michael L. Greenfield, Marina Ruths, and Steve Granick. "Modification of boundary lubrication by oil-soluble friction modifier additives." Tribology Letters 15, 2 (2003): 127-134. doi: 10.1023/A:1024405115736.