Structure and Conductivity of Thermally Grown Scales on Ferritic Fe-Cr-Mn Steel for SOFC Interconnect Applications

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of the Electrochemical Society, 151:A1825

DOI:https://doi.org/10.1149/1.1797031· OSTI ID:859431

Yang, Z Gary; Hardy, John S; Walker, Matthew S; Xia, Gordon; Simner, Steve P; Stevenson, Jeffry W

With the development of solid oxide fuel cells (SOFC) that operate in the intermediate temperature range of 650-800 degrees C, ferritic stainless steels have become promising candidate materials for interconnects in SOFC stacks. The SOFC interconnect requires that the alloy possess not only excellent surface stability, but also high electrical conductivity through the oxide scale that forms at elevated temperatures and contributes to the alloy’s surface stability. It appears that ferritic Fe-Cr-Mn alloys may be potential candidates due to the formation of an electrically conductive scale containing (Mn,Cr)3O4 spinel. To improve the understanding of scale growth on manganese-containing ferritic stainless steels and evaluate their suitability for use in SOFC interconnects, the oxidation behavior (i.e., growth kinetics, composition, structure, and electrical conductivity of the oxide scale) exhibited in a commercially available Fe-Cr-Mn steel developed specifically for SOFC applications was investigated. The results are reported and compared with those of conventional ferritic stainless steel compositions.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 859431
• Report Number(s): PNNL-SA-39432; AA2530000
• Journal Information: Journal of the Electrochemical Society, 151:A1825, Journal Name: Journal of the Electrochemical Society, 151:A1825
• Country of Publication: United States
• Language: English