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

Published online by Cambridge University Press:  31 January 2011

E. C. Dickey ,
B. A. Pint ,
K. B. Alexander  and
I. G. Wright
E. C. Dickey
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506–0046
B. A. Pint
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
K. B. Alexander
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
I. G. Wright
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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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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Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4531 - 4540
Copyright
Copyright © Materials Research Society 1999

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