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TECHNICAL PAPERS

A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery

[+] Author and Article Information
Christopher DellaCorte, Antonio R. Zaldana

National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135

Kevin C. Radil

U.S. Army Research Laboratory, Glenn Research Center, Cleveland, Ohio 44135

J. Tribol 126(1), 200-207 (Jan 13, 2004) (8 pages) doi:10.1115/1.1609485 History: Received January 24, 2003; Revised July 01, 2003; Online January 13, 2004
Copyright © 2004 by ASME
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References

Blok,  H., and vanRossum,  J. J., 1953, “The Foil Bearing-A New Departure in Hydrodynamic Lubrication,” ASLE J. Lubr. Eng., 9, pp. 316–330.
Ma,  J. T. S., 1965, “An Investigation of Self-Acting Foil Bearings,” ASME J. Basic Eng., 87, pp. 837–846.
Barnett, M. A., and Silver, A., 1970, “Application of Air Bearings to High Speed Turbomachinery,” SAE Paper 700720.
Gross, W. A., 1962, Gas Film Lubrication, John Wiley and Sons, Inc.
Heshmat,  H., Shapiro,  W., and Gray,  S., 1982, “Development of Foil Journal Bearings for High Load Capacity and High Speed Whirl Stability,” ASME J. Lubr. Technol., 104(2), pp. 149–156.
DellaCorte, C., and Wood, J. C., 1994, “High Temperature Solid Lubricant Materials for Heavy Duty and Advanced Heat Engines,” NASA TM-106570.
Wagner,  R. C., and Sliney,  H. E., 1986, “Effects of Silver and Group II Fluorides Addition to Plasma Sprayed Chromium Carbide High Temperature Solid Lubricant for Foil Gas Bearings to 650°C,” ASLE Lubr. Eng., 10, pp. 594–600.
DellaCorte, C., 1987, “Composition Optimization of Cr3C2 Based Solid Lubricant Coatings for Foil Gas Bearings at Temperatures to 650°C,” NASA CR-179649.
DellaCorte, C., and Edmonds, B. J., 1995, “Preliminary Evaluation of PS300: A Self-Lubricating High Temperature Composite Coating for Use to 800°C,” NASA TM-107056.
DellaCorte, C., and Fellenstein, J. A., 1996, “The Effects of Compositional Tailoring on the Thermal Expansion and Tribological Properties of PS300: A Solid Lubricant Composite Coating,” NASA TM-107332.
DellaCorte, C., 1998, “The Evaluation of a Modified Chrome Oxide Based High Temperature Solid Lubricant Coating for Foil Gas Bearings,” NASA/TM—1998-208660.
DellaCorte, C., Valco, M. J., Radil, K. C., and Heshmat, H., 2000, “Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinery,” NASA/TM—2000-209187.
Emerson, T. P., 1978, “The Application of Foil Air Bearing Turbomachinery in Aircraft Environmental Control Systems,” ASME Paper No. 780-ENAS-18.
Capstone Microturbine Corporation, 2000, Chatsfield, CA, press release.
Heshmat, H., Walton III, J. F., DellaCorte, C., and Valco, M. J., 2000, “Oil-Free Turbocharger Paves the Way to Gas Turbine Engine Applications,” ASME Paper No. 2000-GT-620.
Radil, K. C., and DellaCorte, C., 2000, “The Effect of Journal Roughness and Foil Coatings on the Performance of Heavily Loaded Foil Air Bearings,” NASA/TM—2000-210941.
DellaCorte,  C., and Valco,  M. J., 2000, “Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbomachinery Applications,” STLE Tribol. Trans., 43(1), pp. 795–801.
Kim, J.-H., 2001, “Surface Roughness, Tribology, Stress Analysis of Thermal-Sprayed Composite Coatings for Foil Gas Bearings,” Ph.D. dissertation, Rensselaer Polytechnic Institute, Troy, NY.
DellaCorte,  C., 1998, “A New Foil Air Bearing Test Rig for Use to 700°C and 70,000 rpm,” STLE Tribol. Trans., 41(3), pp. 335–340.
Heshmat, H., 1999, “High Load Capacity Journal Foil Bearing,” U.S. Patent #5,988,885.
DellaCorte, C., Edmonds, B. J., and Benoy, P. A., 2001, “Thermal Processing Effects on the Adhesive Strength of PS304 High Temperature Solid Lubricant Coatings,” NASA/TM—2001-210944.
Wagner, R. C., 1985, “Experimental Test Program for Evaluation of Solid Lubricant Coatings as Applied to Compliant Foil Gas Bearings to 315°C,” NASA CR-17483.
Lei, J. F., 1997, “Advances in Thin Film Sensor Technologies for Engine Applications,” ASME Paper No. 97-GT-458.
DellaCorte,  C., Fellenstein,  J. A., and Benoy,  P. A., 1999, “Evaluation of Advanced Solid Lubricant Coatings for Foil Air Bearings Operating at 25 and 500°C,” STLE Tribol. Trans., 42(2), pp. 338–342.
Acheson Colloids Company, Molydenum Disulphide manufacturer, Port Huron, MI.
Murray, S. F., 1969, “Research and Development of High Temperature Gas Bearings,” NASA CR-MTI-TR-22, Vol. II.

Figures

Grahic Jump Location
Schematic example of typical first generation foil bearings with axially and circumferentially uniform elastic support elements: (a) leaf-type foil bearing; and (b) bump-type foil bearing.
Grahic Jump Location
Schematic of Generation III foil air bearing tested
Grahic Jump Location
Foil bearing test rig and bearing setup
Grahic Jump Location
Load capacity coefficient of as installed (not broken-in) foil bearing at 25°C, showing the synergistic effects of wear resistant (Al-Cu) foil coatings, self lubricating shaft coatings (PS304) and sacrificial overlay solid lubricants (MoS2)
Grahic Jump Location
Schematic representation of systems approach to bearing lubrication (a) conventional oil lubricated bearing, and (b) multilevel solid/gas lubricated foil air bearing

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