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Continuous High Temperature Lubrication of Ceramics by Carbon Generated Catalytically

Published online by Cambridge University Press:  28 February 2011

James L. Lauer  and
Scott R. Dwyer
James L. Lauer
Affiliation:
Department of Mechanical Engineering, Aeronautical Engineering, and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
Scott R. Dwyer
Affiliation:
Department of Mechanical Engineering, Aeronautical Engineering, and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
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Abstract

A system for the continuous lubrication of ceramic surfaces at high temperatures by a carbon formed exclusively at the wear surfaces is described. Thelubricant is delivered as a simple gas, ethylene, which is catalytically transformed. No reaction products are left which contain bearing surface material and the only non-volatile product is lubricating carbon. One of the wearing surfaces must contain or have an overlay of nickel (about 1000 A thick in this work) and, preferably, a coating of nickel oxide on top to reducenickel wear during startup. Since the carbon is formed only on nickel and the oxide is worn only in the weartrack, only the wear track is lubricated. The laboratory system consisted of a sapphire pin on a nickel-coated rotating alumina disc. Ethylene was delivered only to the conjunction region, which was surrounded by air. Contact pressures were about 200 MPa, linear speeds between 3 and 9cm/sec. Friction coefficients dropped from 0.6 to 0.06 when ethylene was delivered to the contact at 500°C. Wear rateswere not measureable under operating conditions. Cases other than ethylene and catalysts other than nickel will be explored in further work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 140: Symposium S – New Materials Approaches to Tribology: Theory and Applications , 1988 , 363
Copyright
Copyright © Materials Research Society 1989

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References

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