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Oxidation and Resulting Mechanical Properties of Ni/8Y2O3-stabilized Zirconia Anode Substrate for Solid-oxide Fuel Cells

Published online by Cambridge University Press:  31 January 2011

George Stathis ,
Dimitrios Simwonis ,
Frank Tietz ,
Antonia Moropoulou  and
Aristides Naoumides
George Stathis
Affiliation:
National Technical University of Athens, Department of Chemical Engineering, Materials Science and Engineering Section, 9, Iroon Polytechniou Str. Zografou 15780 Athens, Greece
Dimitrios Simwonis
Affiliation:
Forschungszentrum Jülich, Institute for Materials and Processes in Energy Systems, IWV1, D-52425 Jülich, Germany
Frank Tietz
Affiliation:
Forschungszentrum Jülich, Institute for Materials and Processes in Energy Systems, IWV1, D-52425 Jülich, Germany
Antonia Moropoulou
Affiliation:
National Technical University of Athens, Department of Chemical Engineering, Materials Science and Engineering Section, 9, Iroon Polytechniou Str. Zografou 15780 Athens, Greece
Aristides Naoumides
Affiliation:
Forschungszentrum Jülich, Institute for Materials and Processes in Energy Systems, IWV1, D-52425 Jülich, Germany
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Extract

Ni/8 mol% Y2O3-stabilized zirconia cermets are used in thin-film electrolyte solid-oxide fuel cells as support substrates. Rapid oxidation of the metallic Ni can cause failure of the substrate and of the whole system. The rate of Ni oxidation in air and in an inert atmosphere containing water vapor was determined as a function of temperature between 500 and 950 °C. A logarithmic rate law describes the oxidation kinetics in air, whereas a linear rate law fits the first branch of the curve of the experimental data in a humidified inert atmosphere. The substrate exhibits no significant mechanical degradation after uniform oxidation under moderate conditions. However, the observed bending of the samples after oxidation in humidified argon, due to the nonuniform oxidation, can cause damage to fuel cell

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 951 - 958
Copyright
Copyright © Materials Research Society 2002

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