GLTRS--Glenn
TITLE AND SUBTITLE:
Spectroscopic Analysis of Perfluoropolyether Lubricant Degradation During Boundary Lubrication

AUTHOR(S):
Pilar Herrera-Fierro, Bradley A. Shogrin, and William R. Jones, Jr.

REPORT DATE:
September 1996

FUNDING NUMBERS:
WU-505-63-5A

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-10381

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, D.C. 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-107299

SUPPLEMENTARY NOTES:
Prepared for the 1997 Tribology Conference cosponsored by the Society of Tribologists and Lubrication Engineers and the American Society of Mechanical Engineers, London, United Kingdom, September 8-12, 1997. Pilar Herrera-Fierro, Ohio Aerospace Institute, 22800 Cedar Point Road, Brook Park, Ohio 44142; Bradley A. Shogrin, Case Western Reserve University, Cleveland, Ohio 44106; William R. Jones, Jr., NASA Lewis Research Center. Responsible person, William R. Jones, organization code 5140, (216) 433-6051.

ABSTRACT:
The degradation of a branched perfluoropolyether (PFPE) under boundary lubrication conditions was studied using m-FTIR and m-Raman spectroscopies. Stainless steel (440C) discs coated with thin (600Å), 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 unlubricated 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 (RfCOOH). 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.

SUBJECT TERMS:
Perfluoropolyethers; Boundary lubrication; Degradation

NUMBER OF PAGES:
23

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