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Engineering the Interfacial Chemistry in Metal/Oxide Systems

Published online by Cambridge University Press:  10 February 2011

K. PrüBner ,
B. A. Pint ,
P. Y. Hou ,
K. B. Alexandert  and
P. F. Tortorellit
K. PrüBner
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN, USA now at: Institut für Werkstofftechnik, University of Siegen, Germany
B. A. Pint
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN, USA
P. Y. Hou
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA, USA
K. B. Alexandert
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN, USA now at: Los Alamos National Laboratory, Los Alamos, NM, USA
P. F. Tortorellit
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN, USA
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Abstract

Alloys designed for high-temperature applications need to form a protective oxide scale to withstand further degradation by oxidation. The importance of the interfacial chemistry for the adhesion of the protective scale was demonstrated in experiments with β-NiAl, iron-aluminides, NiCrAlYs and Ni-based superalloys. Interfaces between alloys both with and without thermal barrier coatings and their thermally grown alumina scales were studied as well as interfaces between alloys and deposited alumina coatings. It was found, that in all cases improved oxidation performance and scale adhesion could be achieved by doping the alloys with reactive elements. The improvement was shown to be due to interfacial segregation of the reactive element. Segregation of sulfur to internal interfaces on the other hand caused scale spallation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 586: Symposium M – Interfacial Engineering for Optimized Properties II , 1999 , 133
Copyright
Copyright © Materials Research Society 2000

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References

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