Actions for Sputtered silver films to improve chromium carbide based solid lubricant coatings for use to 900 C.

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Sputtered silver films to improve chromium carbide based solid lubricant coatings for use to 900 C.

Author
Sliney, Harold E.
Published
JAN 1, 1988.
Physical Description
1 electronic document
Additional Creators
Deadmore, Daniel L. and Dellacorte, Christopher
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Thin 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.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19880006503.
Accession ID: 88N15885.
NASA-TM-100783.
NAS 1.15:100783.
E-3955.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15696017