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Spectroscopic Analysis of Perfluoropolyether Lubricant Degradation During Boundary LubricationThe degradation of a branched perfluoropolyether (PFPE) under boundary lubrication conditions was studied using mu-FTIR and mu-Raman spectroscopies. Stainless steel (440C) discs coated with thin (600A), uniform films of the PFPE were tested in a ball-on-disc apparatus until various levels of friction coefficient were attained. Discs were then examined using the above techniques. When the friction coefficient surpassed the value obtained with an un-lubricated control, the lubricant film had either been physically displaced or partially transformed in to a 'friction polymer'. Infrared analysis of this 'friction polymer' indicated the presence of a polymeric fluorinated acid species (R(sub f)COOH). Raman spectroscopy indicated the presence of amorphous carbon in the wear track and in the friction polymer. Some reaction mechanisms are suggested to explain the results.
Document ID
19970001743
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Herrera-Fierro, Pilar (Ohio Aerospace Inst. Brook Park, OH United States)
Shogrin, Bradley A. (Case Western Reserve Univ. Cleveland, OH United States)
Jones, William R., Jr. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:107299
E-10381
NASA-TM-107299
Report Number: NAS 1.15:107299
Report Number: E-10381
Report Number: NASA-TM-107299
Meeting Information
Meeting: Tribology Conference
Location: London
Country: United Kingdom
Start Date: September 8, 1997
End Date: September 12, 1997
Sponsors: Society of Tribologists and Lubrication Engineers, American Society of Mechanical Engineers
Accession Number
97N11514
Funding Number(s)
PROJECT: RTOP 505-63-5A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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