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Sputtered silver films to improve chromium carbide based solid lubricant coatings for use to 900 CThin silver films, 250 to 3500 A thick, were sputtered onto PS200, a plasma sprayed, chromium carbide based solid lubricant coating, to reduce run-in wear and improve tribological properties. The coating contains bonded chromium carbide as the wear resistant base stock with silver and barium fluoride/calcium fluoride eutectic added as low and high temperature lubricants, respectively. Potential applications for the PS200 coating are cylinder wall/piston ring lubrication for Stirling engines and foil bearing journal lubrication. In this preliminary program, the silver film overlay thickness was optimized based on tests using a pin-on-disk tribometer. The friction and wear studies were performed in a helium atmosphere at temperatures from 25 to 760 C with a sliding velocity of 2.7 m/s under a 4.9 N load. Films between 1000 and 1500 A provide the best lubrication of the counterface material. The films enrich the sliding surface with lubricant and reduce the initial abrasiveness of the as ground, plasma-sprayed coating surface, thus reducing wear.
Document ID
19880060336
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dellacorte, Christopher
(NASA Lewis Research Center Cleveland, OH, United States)
Sliney, Harold E.
(NASA Lewis Research Center Cleveland, OH, United States)
Deadmore, Daniel L.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1988
Publication Information
Publication: STLE Tribology Transactions
Volume: 31
ISSN: 0569-8197
Subject Category
Nonmetallic Materials
Accession Number
88A47563
Distribution Limits
Public
Copyright
Other

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