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Recent Development of Tribological Coatings for High Temperature Engines
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English
Abstract
Lubrication of advanced high temperature engines has been one of the greatest obstacles in the development of the Adiabatic engine. Liquid lubricants which gave lubricating properties as well as heat removal function can no longer carry out this duty when piston ring top ring reversal temperatures approach 540°C. Solid lubricants offer some hope. Since solid lubricants cannot perform the heat removal function, its coefficient of friction must be very low, at least <0.10, in order to prevent heat build up and subsequent destruction to the piston rings and cylinder liners. The Hybrid Piston concept developed in the U.S. Army Advanced Tribology program offers some hope, since the top solid lubricant ring slides over the bottom hydrodynamic lubricant film section during each stroke.
This paper presents the progress made with the solid lubricant top ring in the Hybrid Piston. Four materials have shown promise in the laboratory to fullfil its mission. The characteristic pairs are:
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Detonation Gun (D-Gun) sprayed and densified chrome oxide versus densified plasma sprayed chrome oxide.
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Densified plasma sprayed chrome oxide versus densified plasma sprayed Tribaloy T-800.
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Densified plasma sprayed iron oxide versus densified plasma sprayed Tribaloy T-800.
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Densified Slurry iron oxide versus densified hardened M-2 steel.
Densification or thermal sealing the plasma spray layer, a process developed on the project, improves the coating's tribological properties. These coating materials are awaiting to be tested in the single cylinder engine.
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Authors
Citation
Kamo, L., Kleyman, A., Bryzik, W., and Schwarz, E., "Recent Development of Tribological Coatings for High Temperature Engines," SAE Technical Paper 950979, 1995, https://doi.org/10.4271/950979.Also In
References
- Kamo R. Bryzik W. “Solid Lubricant Coatings for Advanced Heat Engines,” STLE Annual Meeting May 1993 Calgary Canada
- Moorehouse P. Mortimer B. K. Kamo R. “Solid Lubricant Studies for Adiabatics Diesel Engines” SAE International Conference Feb. 1985 Detroit, Michigan
- Bryzik W. Kamo R. Woods M. “Ion Implantation of Piston Rings for High Temperature Diesel Engines,” STLE Conference Oct. 1994 Lahaina, Hawaii
- Kulik A. Borisov Yu Mrukhir A. Nikitin M. Thermal Spray Composite Powders Leningrad 1985
- Yu Plotnkov “High Temperature Anti-friction Materials” Proc. of 10th Conference on Theory and Practice of Thermal Spray Coatings. Part III 1985
- Taylor B.J. Eyre T. S. “A Review of Piston Ring and Cylinder Liner Materials” Tribology International April 1979