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Transition in high-temperature oxidation kinetics of Pd-modified aluminide coatings: Role of oxygen partial pressure, heating rate, and surface treatment

Published online by Cambridge University Press:  31 January 2011

Daniel Monceau ,
Karima Bouhanek ,
Raphaëlle Peraldi ,
André Malie  and
Bernard Pieraggi
Daniel Monceau
Affiliation:
ENSCT, CIRIMAT-UMR 5085, 118 route de Narbonne, 31077 Toulouse, Cedex 4, France
Karima Bouhanek
Affiliation:
ENSCT, CIRIMAT-UMR 5085, 118 route de Narbonne, 31077 Toulouse, Cedex 4, France
Raphaëlle Peraldi
Affiliation:
ENSCT, CIRIMAT-UMR 5085, 118 route de Narbonne, 31077 Toulouse, Cedex 4, France
André Malie
Affiliation:
ENSCT, CIRIMAT-UMR 5085, 118 route de Narbonne, 31077 Toulouse, Cedex 4, France
Bernard Pieraggi
Affiliation:
ENSCT, CIRIMAT-UMR 5085, 118 route de Narbonne, 31077 Toulouse, Cedex 4, France
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Abstract

The isothermal oxidation of Pd-modified Ni aluminide coatings was studied as a function of Po2 and temperature (900–1200 °C). A kinetic transition was observed between 900 and 1000 °C. Grazing incident x-ray diffraction, thermogravimetric analysis, x-ray photoelectron spectroscopy, scanning electron microscopy/energy dispersive spectroscopy, and secondary ion mass spectrometry analyses are consistent with the growth of δ-alumina or α-alumina below or above this transition temperature. Moreover, because Po2 was established before specimen heating, an effect of heating rate was observed and analyzed. More importantly, no kinetic transition was observed for sand-blasted specimens oxidized at low Po2. Thus conditions for the direct growth of an α-alumina scale could be determined from the reported results.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 665 - 675
Copyright
Copyright © Materials Research Society 2000

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References

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