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Composition optimization of self-lubricating chromium-carbide-based composite coatings for use to 760 CThis paper describes new compositions of self-lubricating coatings that contain chromium carbide. A bonded chromium carbide was used as the base stock because of the known excellent wear resistance and the chemical stability of chromium carbide. Additives were silver and barium fluoride/calcium fluoride eutectic. The coating constituents were treated as a ternary system consisting of: (1) the bonded carbide base material, (2) silver, and (3) the eutectic. A study to determine the optimum amounts of each constituent was performed. The various compositions were prepared by powder blending. The blended powders were then plasma sprayed onto superalloy substrates and diamond ground to the desired coating thickness. Friction and wear studies were performed at temperatures from 25 to 760 C in helium and hydrogen. A variety of counterface materials were evaluated with the objective of discovering a satisfactory metal/coating sliding combination for potential applications such as piston ring/cylinder liner couples for Stirling engines.
Document ID
19870040564
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dellacorte, Chris
(NASA Lewis Research Center Cleveland, OH, United States)
Sliney, Harold E.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: ASLE Transactions
Volume: 30
ISSN: 0569-8197
Subject Category
Nonmetallic Materials
Accession Number
87A27838
Distribution Limits
Public
Copyright
Other

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