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Materials Selection for High Temperature (750°–1000°C) Metallic Recuperators for Improved Efficiency Microturbines

[+] Author Affiliations
Bruce A. Pint, Robert W. Swindeman, Karren L. More, Peter F. Tortorelli

Oak Ridge National Laboratory, Oak Ridge, TN

Paper No. 2001-GT-0445, pp. V001T04A002; 7 pages
doi:10.1115/2001-GT-0445
From:
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME

abstract

The incorporation of a primary surface recuperator is one method for significantly improving the energy efficiency of a microturbine. The goal of this work is to employ laboratory testing of foil material (≈ 75-125μm or 3-5 mil thickness) to select alloys for higher temperature (750°−1000°C, 1400-1800°F) recuperator performance based on creep strength and corrosion resistance. Alloys of interest are high-Cr, Ni-base superalloys such as alloy 625 and aluminum-containing alloys such as Haynes alloy 214 and Plansee alloy PM2000, which is an oxide-dispersed FeCrAl. The interest in the latter two alloys is based on their corrosion resistance. Particularly in exhaust gas environments, chromia surface oxides are not sufficiently protective at high temperatures to achieve desired lifetimes. The formation of a slow-growing external alumina scale confers exceptional corrosion resistance for this application.

Copyright © 2001 by ASME

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