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The Evaluation of a Modified Chrome Oxide Based High Temperature Solid Lubricant Coating for Foil Gas BearingsThis paper describes the friction and wear performance of PS304, a modified chrome oxide based coating, for foil gas bearings. PS304 contains 60 wt% NiCr binder, 20 wt% Cr2O3 hardener, and 10 wt% each Ag, and BaF2/CaF2 lubricants. For evaluation, the coating is plasma spray deposited onto test journals which are slid against a superalloy partial arc foil bearing. The test load was 10 KPa (1.5 psi) and the bearings were run under start/stop cyclic conditions. The data show good wear performance of the bearing, especially at temperatures above 25 deg. C. Bearing friction was moderate (micron approx. or equal to 0.4) over the entire temperature range. Based upon the results obtained, the PS304 coating has promise for high temperature, oil-free turbomachinery applications.
Document ID
19980234655
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
DellaCorte, Chris (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1998
Subject Category
Chemistry And Materials (General)
Report/Patent Number
NASA/TM-1998-208660
E-11361
NAS 1.15:208660
Funding Number(s)
PROJECT: RTOP 523-22-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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