Performance of advanced turbocharger alloys and coatings at 850-950°C in air with water vapor

B. A. Pint; J. A. Haynes; B. L. Armstrong

doi:10.1016/j.surfcoat.2012.08.099

Performance of advanced turbocharger alloys and coatings at 850-950°C in air with water vapor

B. A. Pint, J. A. Haynes, B. L. Armstrong

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11 Scopus citations

Abstract

Turbochargers for transportation and power generation systems are of significant interest to improve efficiency and reduce specific emissions. As exhaust temperatures continue to increase, the oxidation resistance and mechanical properties of candidate Ni-base and TiAl alloys were investigated at 850-950 °C in wet air to simulate exhaust gas. Room temperature tensile properties were measured after exposures showing some loss in ductility and strength after 500-1000 1-h thermal cycles. At 950 °C, Ti-49Al-2Nb-1Cr was more severely attacked suggesting Ni-base alloys are needed at this and higher temperatures. Selected Ni-base alloys also were aluminized via chemical vapor deposition or a low-cost slurry process and the as-deposited chemistry and microstructure are shown. Initial coating oxidation results at 950 °C in wet air are reported.

Original language	English
Pages (from-to)	90-95
Number of pages	6
Journal	Surface and Coatings Technology
Volume	215
DOIs	https://doi.org/10.1016/j.surfcoat.2012.08.099
State	Published - Jan 25 2013

Funding

The authors would like to thank K. M. Cooley, G. Garner, T. Lowe and H. Longmire for their assistance with the experimental work. Capstone Turbines, Caterpillar and Honeywell provided material for this work. M. P. Brady and S. Dryepondt provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy , U.S. Assistant Secretary for Energy Efficiency and Renewable Energy , Industrial Technologies Program (Combined Heat and Power) and Office of Vehicle Technologies .

Keywords

Aluminide coatings
Ni-base alloys
Oxidation resistance
TiAl
Turbocharger
Water vapor

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10.1016/j.surfcoat.2012.08.099

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title = "Performance of advanced turbocharger alloys and coatings at 850-950°C in air with water vapor",

abstract = "Turbochargers for transportation and power generation systems are of significant interest to improve efficiency and reduce specific emissions. As exhaust temperatures continue to increase, the oxidation resistance and mechanical properties of candidate Ni-base and TiAl alloys were investigated at 850-950 °C in wet air to simulate exhaust gas. Room temperature tensile properties were measured after exposures showing some loss in ductility and strength after 500-1000 1-h thermal cycles. At 950 °C, Ti-49Al-2Nb-1Cr was more severely attacked suggesting Ni-base alloys are needed at this and higher temperatures. Selected Ni-base alloys also were aluminized via chemical vapor deposition or a low-cost slurry process and the as-deposited chemistry and microstructure are shown. Initial coating oxidation results at 950 °C in wet air are reported.",

keywords = "Aluminide coatings, Ni-base alloys, Oxidation resistance, TiAl, Turbocharger, Water vapor",

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AU - Pint, B. A.

AU - Haynes, J. A.

AU - Armstrong, B. L.

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AB - Turbochargers for transportation and power generation systems are of significant interest to improve efficiency and reduce specific emissions. As exhaust temperatures continue to increase, the oxidation resistance and mechanical properties of candidate Ni-base and TiAl alloys were investigated at 850-950 °C in wet air to simulate exhaust gas. Room temperature tensile properties were measured after exposures showing some loss in ductility and strength after 500-1000 1-h thermal cycles. At 950 °C, Ti-49Al-2Nb-1Cr was more severely attacked suggesting Ni-base alloys are needed at this and higher temperatures. Selected Ni-base alloys also were aluminized via chemical vapor deposition or a low-cost slurry process and the as-deposited chemistry and microstructure are shown. Initial coating oxidation results at 950 °C in wet air are reported.

KW - Aluminide coatings

KW - Ni-base alloys

KW - Oxidation resistance

KW - TiAl

KW - Turbocharger

KW - Water vapor

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ER -

Performance of advanced turbocharger alloys and coatings at 850-950°C in air with water vapor

Abstract

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Keywords

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