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Short-Term Oxidation Studies on Nicrofer-6025HT in Air at Elevated Temperatures for Advanced Coal Based Power Plants

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Abstract

Several advanced air separation unit (ASU) designs being considered for use in coal gasification rely on the use of solid state mixed ionic and electronic conductors. Nicrofer-6025HT, a nickel-based alloy, has been identified as a potential manifold material to transport the hot gases into the ASUs. In the current study, isothermal oxidation tests were conducted on Nicrofer-6025HT in the temperature range of 700–900 °C for up to 24 h. The evolution of oxide scale was evaluated using SEM, XRD, and XPS. The composite surface oxide layer that formed consisted of an outer chromia-rich scale and an inner alumina scale. For the longer times at the higher temperatures evaluated, a NiCr2O4 spinel phase was located at the interface between the alumina and chromia. Based on the experimental results a four-step oxidation model was proposed.

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Acknowledgments

This work was supported by the U.S. Department of Energy, Office of Fossil Energy. The Pacific Northwest National Laboratory is operated by Battelle Memorial Institute for the United States Department of Energy (U.S. DOE) under Contract DE-AC06-76RLO 1830. The research was performed using EMSL, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, Richland, WA, USA

    Vineet V. Joshi, Jens Darsell, Ponnusamy Nachimuthu, Mark Bowden & K. Scott Weil

  2. Department of Metallurgical and Materials Engineering, Montana Tech, Butte, MT, USA

    Alan Meier

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  1. Vineet V. Joshi
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  2. Alan Meier
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  3. Jens Darsell
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  4. Ponnusamy Nachimuthu
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  5. Mark Bowden
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  6. K. Scott Weil
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Correspondence to Vineet V. Joshi.

Additional information

Vineet V. Joshi and Alan Meier—Formerly at Kazuo Inamori School of Engineering, Alfred University, Alfred, NY.

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Joshi, V.V., Meier, A., Darsell, J. et al. Short-Term Oxidation Studies on Nicrofer-6025HT in Air at Elevated Temperatures for Advanced Coal Based Power Plants. Oxid Met 79, 383–404 (2013). https://doi.org/10.1007/s11085-013-9362-6

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  • DOI: https://doi.org/10.1007/s11085-013-9362-6

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