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Formation of discontinuous Al2O3 layers during high-temperature oxidation of RuAl alloys

Published online by Cambridge University Press:  01 January 2006

P.J. Bellina ,
A. Catanoiu ,
F.M. Morales  and
M. Rühle
P.J. Bellina*
Affiliation:
Max-Planck-Institute für Metallforschung, 70569 Stuttgart, Germany
A. Catanoiu
Affiliation:
Max-Planck-Institute für Metallforschung, 70569 Stuttgart, Germany
F.M. Morales
Affiliation:
Max-Planck-Institute für Metallforschung, 70569 Stuttgart, Germany
M. Rühle
Affiliation:
Max-Planck-Institute für Metallforschung, 70569 Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Bond coats play a crucial role in the performance of thermal barrier coating systems. Ru alloys have been identified as promising candidates; therefore, systematic studies were performed on the oxidation behavior of bulk RuAl (50–50 at.%). Isothermal oxidation and thermogravimetric analyses were performed at 1100 °C for different times ranging from 0.1 h to 500 h. Microstructural characterization was performed by scanning and transmission electron microscopy. The results showed the formation of an α–Al2O3 layer on top of a δ–Ru layer. Interface instability between these layers and evaporation of gaseous Ru-oxides lead to the formation of large elongated cavities and alternating α–Al2O3/δ–Ru layers.

Keywords

AlloyOxidationTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 276 - 286
Copyright
Copyright © Materials Research Society 2006

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