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performance and durability of high temperature foil air bearing for oil-free turbomachineryThe performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS304, is applied to the shaft by plasma spraying. PS304, is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
Document ID
20000004303
Document Type
Technical Memorandum (TM)
Authors
DellaCorte, C.
(NASA Glenn Research Center Cleveland, OH United States)
Valco, M. J.
(Army Research Lab. Cleveland, OH United States)
Radil, K. C.
(Army Research Lab. Cleveland, OH United States)
Heshmat, H.
(Mohawk Innovative Technology, Inc. Albany, NY United States)
Date Acquired
September 7, 2013
Publication Date
November 1, 1999
Subject Category
Aircraft Propulsion and Power
Report/Patent Number
NAS 1.15:209187
E-11697
NASA/TM-1999-209187
Funding Number(s)
PROJECT: RTOP 523-22-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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