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Andrews, James
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document
Modelling Microstructural and Chemical Degradation of Ferritic Stainless Steels for SOFC Interconnects
Abstract
Ferritic (FeCrX) alloys forming a protective chromium oxide layer (Cr2O3) are the preferred materials for the interconnect component in solid oxide fuel cells (SOFC). <br/>Due to their oxidation rate in moist air, these alloys undergo degradation causing an increase in interconnect electrical contact resistance and formation of (poisonous) volatile chromium species. Developing coating agents and techniques that protect these alloys and lower their degradation rates is the current approach to extending SOFC lifetime. <br/>In this paper we examine the oxidation behaviour of an uncoated ferritic stainless steel interconnect for a supposed SOFC system operating at 850oC. <br/> A precursor numerical model with respect to the oxidation and evaporation kinetics of the steel has been developed. The model is able to predict the weight gain of the samples upon oxidation, the oxide film thickness, the volatilisation of chromium, and the useable lifetime of interconnects based on chromium depletion calculations.