Development of surface coatings for air-lubricated, compliant journal bearings to 650 CSurface coatings for an air-lubricated, compliant journal for an automotive gas turbine engine were tested to find those capable of withstanding temperatures of either 540 C (1000 F) or 650 C (1200 F). Also, the coatings have to be capable of surviving the start-stop sliding contact cycles prior to rotor lift-off and at touchdown. Selected coating combinations were tested in start-stop tests at 14 kPa (2 psi) loading for 2000 cycles at room and maximum temperatures. Specific coating recommendations are: Cdo and graphite on foil versus chrome carbide on journal up to 370 C (700 F); NASA PS-120 (Tribaloy 400, silver, and CaF2) on journal versus uncoated foil up to 540 C (1000 F); and chemically adherent Cr2O3 on journal and foil up to 650 C (1200 F). The chemically adherent Cr2O3 coating system was further tested successfully at 35 kPa (5 psi) loading for 2000 start-stop cycles.
Document ID
19790039239
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bhushan, B. (Mechanical Technology, Inc. Latham, NY, United States)
Gray, S. (Mechanical Technology, Inc. Latham, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
October 1, 1978
Subject Category
Mechanical Engineering
Report/Patent Number
ASLE PREPRINT 78-LC-3C-1
Meeting Information
Meeting: American Society of Lubrication Engineers and American Society of Mechanical Engineers, Joint Lubrication Conference