Transmission Electron Microscopy of Boundary-Lubricated Bearing Surfaces. Part II: Mineral Oil Lubricant with Sulfur- and Phosphorus-Containing Gear Oil Additives

Authors: Evans, Ryan¹; More, Karren¹; Darragh, Craig²; Nixon, Harvey²

Source: Tribology Transactions, Volume 48, Number 3, July-September 2005 , pp. 299-307(9)

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Abstract:

Transmission electron microscopy (TEM) was performed on cross-sectional samples of tapered roller bearing cone surfaces that were tested at two levels of local boundary lubrication severity, ? ~ 1.1 and 0.3. Unlike our previously reported work in which a base mineral oil was used, the bearing tests were conducted in mineral oil with sulfur- and phosphorus-containing gear oil additives. Structural and compositional characterization of undetached antiwear surface layers on the base steel (cone raceway) revealed that the films contained crystalline and amorphous regions. A sharp interface (

Keywords: Tapered Roller Bearing; Boundary Lubrication; Oxides; Surface Films; Transmission Electron Microscopy (TEM); Wear; Additives

Document Type: Research article

DOI: http://dx.doi.org/10.1080/05698190590965602

Affiliations: 1: Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6064, USA 2: The Timken Company, Canton, Ohio, 44706-0930, USA

Publication date: 2005-07-01