• Author: Bednarz, M.

    AGH University of Science and Technology, Poland

  • Author: Molin, S.

    Department of Energy Conversion and Storage, Technical University of Denmark, Denmark

  • Author: Bobruk, M.

    AGH University of Science and Technology, Poland

  • Author: Stygar, M.

    AGH University of Science and Technology, Poland

  • Author: Długoń, E.

    AGH University of Science and Technology, Poland

  • Author: Sitarz, M.

    AGH University of Science and Technology, Poland

  • Author: Brylewski, T.

    AGH University of Science and Technology, Poland

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The aim of the presented study was to deposit protective-conducting Mn1.45Co1.45Fe0.1O4 and Mn1.5Co1.5O4 spinel coatings on the Crofer 22 H ferritic steel by means of electrophoresis and to evaluate their physicochemical properties after high-temperature oxidation under thermal cycling conditions. When the Crofer 22 H steel – whether uncoated or coated with the two spinels – was oxidized in 48-h cycles involving a temperature of either 750 or 800 °C, its oxidation kinetics approximately obeyed the parabolic rate law. The oxidation rate observed for uncoated steel was higher than that for the studied coating/steel systems. The Fe-doped spinel coating material improved the oxidation resistance of steel to a higher degree than the undoped spinel coating. The obtained bulk spinels exhibited a regular phase composition and high electrical conductivity, while the Mn1.45Co1.45Fe0.1O4 and Mn1.5Co1.5O4 coatings were dual-phase, compact, and exhibited good adhesion to the metallic substrate. The area-specific resistance values measured for the steel/coating systems indicate that the coatings significantly improve the electrical properties of the studied ferritic steel, especially at 800 °C. The
conducted research confirmed the suitability of the Mn1.45Co1.45Fe0.1O4 and Mn1.5Co1.5O4 spinels as coatings on the Crofer 22 H ferritic steel to be applied in the production of interconnects used in intermediate-temperature SOFCs.
Original languageEnglish
JournalMaterials Chemistry and Physics
Volume225
Pages (from-to)227-238
ISSN0254-0584
DOIs
StatePublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Solid oxide fuel cell (SOFC), Metallic interconnects, Cobalt manganese spinels, Oxidation kinetics, Electrical conductivity
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