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Title: 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

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Case Western Reserve Univ., Cleveland, OH (USA); National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
OSTI Identifier:
5426412
Report Number(s):
DOE/NASA/50194-40; NASA-TM-86895; CONF-8505124-1
ON: DE85011081
DOE Contract Number:  
AI01-80CS50194
Resource Type:
Conference
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
Subject:
36 MATERIALS SCIENCE; 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

Citation Formats

Wagner, R C, and Sliney, H E. 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. United States: N. p., 1985. Web.
Wagner, R C, & Sliney, H E. 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. United States.
Wagner, R C, and Sliney, H E. 1985. "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". United States.
@article{osti_5426412,
title = {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},
author = {Wagner, R C and Sliney, H E},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5426412}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}

Conference:
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