Oxidation behavior of (Co,Mn)3O4 coatings on preoxidized stainless steel for solid oxide fuel cell interconnects

Ceramic coatings are being explored to extend the lifetime of stainless steel interconnects in planar Solid Oxide Fuel Cells (SOFCs). One promising coating is Co1.5Mn1.5O4 spinel, which is deposited using various techniques, resulting in different coating thicknesses, compositions and microstructure...

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Bibliographic Details
Published in:International journal of hydrogen energy 2012, Vol.37 (1), p.518-529
Main Authors: HOYT, Kathryn O, GANNON, Paul E, WHITE, Preston, TORTOP, Rukiye, ELLINGWOOD, Brian J, KHOSHUEI, Hamed
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Chromium
Coatings
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Magnetron sputtering
Oxidation
Solid oxide fuel cells
Stainless steels
Trends
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Summary:Ceramic coatings are being explored to extend the lifetime of stainless steel interconnects in planar Solid Oxide Fuel Cells (SOFCs). One promising coating is Co1.5Mn1.5O4 spinel, which is deposited using various techniques, resulting in different coating thicknesses, compositions and microstructures. In this study, stainless steel 441HP samples were subjected to three levels of preoxidation (0, 3, 10 and 100 h in 800 degree C lab air) prior to coating. Samples were coated with 2 mu m CoMn alloy using magnetron sputtering and were subsequently annealed in 800 degree C air for 0, 10, 100 or 1650 h. Oxidation behaviors were evaluated as a function of these exposures, as well as in dual atmospheres and during area specific resistance (ASR) measurements in 800 degree C lab air. Preoxidation was found to inhibit Fe and Cr transport from the stainless steel into the coating and preoxidized samples exhibited a substantially thinner surface layer after oxidation. After ASR testing for 1650 h in 800 degree C air, the trend of the preoxidized sample values remained level while trend of the non-preoxidized sample values showed an increase. Observed oxidation behaviors, their possible mechanisms, and implications for SOFC interconnects are presented and discussed.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2011.09.028