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Enhancement of Perfluoropolyether Boundary Lubrication PerformanceA ball bearing simulator operating under starved conditions was used to perform screening tests to evaluate the boundary lubrication performance of a branched perfluoropolyether (PFPE), K-143 AB. Several approaches to enhance boundary lubrication were studied. These included: (1) soluble boundary additives, (2) bearing surface modifications, (3) 'run-in' surface films, and (4) ceramic bearing components. In addition, results were compared with two non-perfluorinated liquid lubricant formulations. Based on these tests, the following tentative conclusions can be made: (1) Substantial improvements in boundary lubrication performance were observed with a beta-diketone boundary additive and a tricresyl phosphate (TCP) liquid surface pretreatment, (2) the use of rough Si3N4 balls (R(sub a) = 40 micro-inch) also provided increases in test duration, but with concomitant abrasive wear, (3) moderate improvements were seen with two boundary additives (a phosphine and a phosphatriazine) and a neat (100%) fluid (a carboxylic acid terminated PFPE); and small improvements with surface pretreatments with synthetic hydrocarbons, a polytetrafluoroethylene (PTFE) coating, and TiC coated 440 C and smooth Si3N4 balls (R(sub a) = 1 micro-inch), and (4) two non-PFPE lubricant formulations (a polyalphaolefin (PAO) and synthetic hydrocarbon) yielded substantial improvements.
Document ID
19970001595
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jones, W. R., Jr. (NASA Cleveland, OH United States)
Ajayi, O. O. (Wedeven Associates, Inc. Edgemont, PA United States)
Wedeven, L. D. (Wedeven Associates, Inc. Edgemont, PA United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TM-107306
NAS 1.15:107306
E-10393
Meeting Information
Meeting: International Tribology Conference and Exposition
Location: San Fransisco, CA
Country: United States
Start Date: October 13, 1996
End Date: October 17, 1996
Sponsors: Society of Tribologists and Lubrication Engineers, American Society of Mechanical Engineers
Accession Number
97N11389
Funding Number(s)
PROJECT: RTOP 616-00-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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