Phase Field Study of Cr-Oxide Growth Kinetics in the Crofer 22 APU Alloy Supported by Wagner’s Theory

Kai Wang () and Robert Spatschek
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Kai Wang: Institute for Energy and Climate Research, IEK-2, Forschungszentrum Jülich, 52425 Jülich, Germany
Robert Spatschek: Institute for Energy and Climate Research, IEK-2, Forschungszentrum Jülich, 52425 Jülich, Germany

Energies, 2023, vol. 16, issue 8, 1-11

Abstract: The Crofer 22 APU alloy is a frequently used metallic material to manufacture interconnects in solid oxide fuel cells. However, the formation and evaporation of Cr 2 O 3 not only increases the electrical resistance but also leads to the Cr-related degradation over the service time. In order to investigate the growth kinetics of Cr-oxide, i.e., Cr 2 O 3 , the multi-phase field model coupled with reliable CALPHAD databases is employed. The phase field simulation results are benchmarked with the predictions of Wagner’s theory. Moreover, we evidence the influence of the temperature and Cr concentration on the ferritic matrix phase and the oxygen concentration at the Cr 2 O 3 /gas interface on the growth kinetics of Cr-oxide, paving the way for further investigations of Cr-related solid oxide fuel cell degradation processes.

Keywords: phase field model; oxidation formation; Crofer 22 APU; SOFC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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