Developmnent of (Mn,Co)3O4 Protection Laters on Ferritic Sta

Development of (Mn,Co)3O4 Protection Layers on Ferritic Stainless Steels for SOFC Interconnect Applications
Z. Yang, X. Li, P. Singh, J.W. Stevenson, G. Xia, and X. Zhou

A spinel-based surface protection layer has been developed for alloy SOFC interconnects. The (Mn,Co)3O4 spinel with a nominal composition of Mn1.5Co1.5O4 demonstrates an excellent electrical conductivity and thermal expansion match to ferritic stainless steel interconnects. A slurry-based coating technique provides a viable approach for fabricating protective layers of the spinel onto the steel interconnects. Thermally grown protection layers of Mn1.5Co1.5O4 have been found not only to significantly decrease the contact resistance between a LSF cathode and stainless steel interconnect, but also inhibit the sub-scale growth on the stainless steel. The combination of the inhibited sub-scale growth, good thermal expansion matching between the spinel and the stainless steel, and the closed-pore structure contribute to the excellent structural and thermomechanical stability of these spinel protection layers, which was verified by a long-term thermal-cycling test. The spinel protection layers can also act effectively to prevent outward diffusion of chromium from the interconnect alloy, preventing subsequent chromium migration into the cathode and contact materials.

Publisher: TMS
Product Format: PDF
Pages: 81-92
Date Published: June 1, 2007
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