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Durable solid lubricant coatings for foil gas bearings to 315 deg CThe durability and friction characteristics of bonded solid lubricant films on compliant gas bearings were measured. Coating compositions, which were judged to be suitable for use to at least 315 C, were selected for this study. Most of the data were obtained with polyimide-bonded graphite fluoride coatings and with silicate-bonded graphite coatings. These coatings were applied to the bore of Inconel 750 foil bearings. The journals were A286 stainless steel, with a rms surface finish of 0.2 microns. The foils were subjected to repeated start/stop cycles under a 14 kPa (2 psi) bearing unit load. Sliding contact occurred during lift-off and coast down at surface velocities less than 6 m/s (3000 rpm). Testing continued until 9000 cycles were accumulated or until a rise in starting torque indicated that the coating had failed. The coatings were evaluated in the temperature range from 25 C to 315 C. Comparisons in coating performance as well as discussions of their properties and methods of application are given.
Document ID
19840011499
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wagner, R. C. (Case Western Reserve Univ. Cleveland, OH, United States)
Sliney, H. E. (NASA Lewis Research Center)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TM-83596
NAS 1.15:83596
E-1904
Accession Number
84N19567
Funding Number(s)
PROJECT: RTOP 505-33-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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