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Friction and wear of plasma-sprayed coatings containing cobalt alloys from 25 deg to 650 deg in airFour different compositions of self-lubricating, plasma-sprayed, composite coatings with calcium fluoride dispersed throughout cobalt alloy-silver matrices were evaluated on a friction and wear apparatus. In addition, coatings of the cobalt alloys alone and of one coating with a nickel alloy-silver matrix were evaluated for comparison. The wear specimens consisted of two, diametrically opposed, flat rub shoes sliding on the coated, cylindrical surface of a rotating disk. Two of the cobalt composite coatings gave a friction coefficient of about 0.25 and low wear at room temperature, 400 and 650 C. Wear rates were lower than those of the cobalt alloys alone or the nickel alloy composite coating. However, oxidation limited the maximum useful temperature of the cobalt composite coating to about 650 C compared to about 900 C for the nickel composite coating.
Document ID
19800059006
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sliney, H. E.
(NASA Lewis Research Center Cleveland, OH, United States)
Jacobson, T. P.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1980
Subject Category
Mechanical Engineering
Report/Patent Number
ASLE PREPRINT 80-AM-6C-2
Meeting Information
Meeting: Annual Meeting
Location: Anaheim, CA
Start Date: May 5, 1980
End Date: May 8, 1980
Sponsors: American Society of Lubrication Engineers
Accession Number
80A43176
Distribution Limits
Public
Copyright
Other

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