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Sliding Contact Bearings for Service to 700 CCylindrical, sliding contact bearings made entirely of a self-lubricating powder metallurgy composite (PM212) or of super alloy shells lined with clad PM212 were tested in an oscillating mode at temperatures from 25 to 700 C. Tests of 100 hr duration or longer were conducted at a bearing unit load of 3.45 Mpa (500 psi). Shorter duration tests at various unit loads up to 24.1 Mpa (3500 psi) were also conducted. In comparison tests, bearings lubricated with PM212 had superior anti-wear characteristics compared to the baseline, unlubricated, super alloy bearings: no galling of PM212-lubricated bearings occurred, while severe surface damage including galling occurred, especially at high loads, during the baseline tests. A heat treatment procedure, which dimensionally stabilizes PM212 and thereby minimizes clearance changes during high temperature bearing operation, is described.
Document ID
19970001430
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Sliney, Harold E. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-TM-107307
NAS 1.15:107307
E-10396
Accession Number
97N11245
Funding Number(s)
PROJECT: RTOP 505-63-5A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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