Effects of silver and Group II fluorides addition to plasma sprayed chromium carbide high temperature solid lubricant for foil gas bearings to 650/sup 0/C
A new self-lubricating coating composition of nickel aluminide-bonded chromium carbide fromulated with silver and Group II fluorides was developed. One of the proposed applications for this new coating composition is as a wide temperature spectrum solid lubricant for compliant foil gas bearings. Friction and wear properties were obtained using a foil gas bearing start/stop apparatus at temperatures from 25 to 650/sup 0/C. The journals were Inconel 718. Some were coated with the plasma sprayed experimental coating, others with unmodified nickel aluminide/chromium carbide as a baseline for comparison. The additional components were provided to assist in achieving low friction over the temperature range of interest. Uncoated, preoxidized inconel X-750 foil bearing were operated against these surfaces. The foils were subjected to repeated start/stop cycles under a 14-kPa (2-psi) bearing unit loading. Sliding contact occurred during lift-off and coastdown at surface velocities less than 6 m/s (3000 rpm). Testing continued until 9000 start/stop cycles were accumulated or until a rise in starting torque indicated the journal/bearing had failed. Comparison in coating performance as well as discussions of their properties and methods of application are given.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (USA); National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- AI01-80CS50194
- OSTI ID:
- 5426412
- Report Number(s):
- DOE/NASA/50194-40; NASA-TM-86895; CONF-8505124-1; ON: DE85011081
- Resource Relation:
- Conference: Annual meeting of the American Society of Lubrication Engineers, Las Vegas, NV, USA, 6 May 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GAS BEARINGS
SOLID LUBRICANTS
PERFORMANCE TESTING
ALUMINIUM ALLOYS
CHROMIUM CARBIDES
COATINGS
FLUORIDES
FRICTION
INCONEL X750
NICKEL ALLOYS
SILVER
WEAR
ALLOYS
BEARINGS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
ELEMENTS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INCONEL ALLOYS
IRON ALLOYS
LUBRICANTS
METALS
NICKEL BASE ALLOYS
TESTING
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360600* - Other Materials