Continuous high-temperature lubrication of ceramics by carbon generated catalytically
A system for the continuous lubrication of ceramic surfaces at high temperatures by a carbon formed exclusively at the wear surfaces is described. The lubricant 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 reduce nickel wear during startup. Since the carbon is formed only on nickel and the oxide is worn only in the wear track, 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 9 cm/sec. Friction coefficients dropped from 0.6 to 0.06 when ethylene was delivered to the contact at 500 C. Wear rates were not measureable under operating conditions. Gases other than ethylene and catalysts other than nickel will be explored in further work.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Mechanical Engineering, Aeronautical Engineering and Mechanics
- OSTI ID:
- 5419689
- Report Number(s):
- AD-A-211249/8/XAB
- Resource Relation:
- Other Information: Pub. in Materials Research Society Symposium Proceedings, Vol. 140, 363-368(Jun 1989)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM OXIDES
LUBRICATION
CARBON
ETHYLENE
CATALYTIC REFORMING
NICKEL
COATINGS
AUGER ELECTRON SPECTROSCOPY
CATALYSIS
CATALYSTS
CERAMICS
FRICTION
GASES
HIGH TEMPERATURE
MATERIALS
NICKEL OXIDES
RAMAN SPECTROSCOPY
SAPPHIRE
SOLID LUBRICANTS
SURFACES
VELOCITY
WEAR
ALKENES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CORUNDUM
ELECTRON SPECTROSCOPY
ELEMENTS
FLUIDS
HYDROCARBONS
LASER SPECTROSCOPY
LUBRICANTS
METALS
MINERALS
NICKEL COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFORMER PROCESSES
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360205* - Ceramics
Cermets
& Refractories- Corrosion & Erosion