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Exploratory Development of Insulated Components for High Temperature Engines
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Abstract
Significant headway has recently been achieved in advanced high-temperature component design. Progress has been made in selecting a highly effective thermal insulating design composed of a titanium alloy piston with 1.0 mm thermal barrier coating which provides the same level of insulating effectiveness as a ductile iron piston with 2.5 mm coating. The low thermal conductivity of Titanium Alloy 6242 inherently provides a significant level of thermal resistance which effectively reduces the required coating thickness, reduces thermal stresses, and nearly eliminates coating thermal expansion mismatch. Other benefits of the titanium alloy piston include low weight and increased high temperature strength.
Thermal rig testing has been completed on several plasma-sprayed zirconia coatings and a critical durability threshold thickness of 1.25 mm has been identified. In addition, zirconia coatings and chrome-oxide-densified Eirconia coatings have been screened in a small bore diesel engine. The only coating which remained free of visual surface cracks was the chrome-oxide-densified coating.
This paper will present the second year's results and future plans of the low-heat-rejection engine component technology development program for high output military engines sponsored by the U.S. Army Tank-Automot ive Command (TACOM).
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Woods, M., Glance, P., and Schwarz, E., "Exploratory Development of Insulated Components for High Temperature Engines," SAE Technical Paper 880191, 1988, https://doi.org/10.4271/880191.Also In
References
- Kamo R. Bryzik W. “Cummins/TACOM Advanced Adiabatic Engine,” SAE Technical Paper 840428 1984
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- Sutor P. Glance P. “Tribological Systems for High-Temperature Diesel Engines,” SAE Technical Paper 870157 1987
- Kvernes I. Hoel R. “Advanced Coating Developments for Internal Combustion Engine Parts,” SAE Technical Paper 870160 1987
- Woods M. Oda I. “PSZ Ceramics for Adiabatic Engine Components,” SAE Technical Paper 820429 1982
- Assanis D. Badillo E. “Transient Heat Conduction in Low Heat Rejection Engine Combustion Chambers,” SAE Technical Paper 870156 1987
- Kamo R. Kubo I. Woods M. “Development of an Adiabatic Diesel Engine,” Cummins Engine Company Technical Report 12558, Written for U.S. TACOM 1980
- Jones J. “Post-densified Chrome Oxide Coatings for Adiabatic Engine,” SAE Technical Paper 840432 1984
- Coers R. Fox L. Jones D, “Cummins Uncooled 250 Engine,” The Adiabatic Engine: Past, Present and Future 425 440 1984