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Oxidation behavior of platinum–aluminum alloys and the effect of Zr doping

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Abstract

The isothermal and cyclic oxidation behavior of PtAl and PtAl + Zr was studied followed by postoxidation microstructural and microchemical analyses. Their isothermal oxidation performance at 1200 °C was similar to that of NiAl and NiAl + Zr. In short (1-h) cycles, the cyclic oxidation resistance of undoped PtAl was found to be substantially better than NiAl. However, with longer (100-h) cycles, little improvement in the metal consumption rate was observed relative to NiAl. The addition of Zr to PtAl significantly improved cyclic oxidation performance in both short- and long-cycle tests. Spatially resolved energy dispersive spectroscopy indicated Zr segregation to both the metal–oxide interface and Al2O3 grain boundaries.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky, 40506-0046, USA

    E. C. Dickey

  2. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

    B. A. Pint, K. B. Alexander & I. G. Wright

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  1. E. C. Dickey
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  2. B. A. Pint
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  3. K. B. Alexander
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  4. I. G. Wright
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Dickey, E.C., Pint, B.A., Alexander, K.B. et al. Oxidation behavior of platinum–aluminum alloys and the effect of Zr doping. Journal of Materials Research 14, 4531–4540 (1999). https://doi.org/10.1557/JMR.1999.0615

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  • DOI: https://doi.org/10.1557/JMR.1999.0615

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