Interaction mechanisms between slurry coatings and solid oxide fuel cell interconnect alloys during high temperature oxidation

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Abstract

Six different coatings consisting of fluorite-, corundum-, spinel- or perovskite-type oxides were deposited on a Fe22Cr alloy (Crofer 22APU) and oxidized at 900°C in moisturized air.Five of the coatings prevented break-away oxidation otherwise observed for the uncoated alloy, and the parabolic oxidation rate constant was reduced with 50–90% of that for uncoated alloy. One coating consisting of MnCo2O4 did not significantly affect the oxidation rate of the alloy, and just as for uncoated samples break-away oxidation occurred for MnCo2O4 coated samples. The interaction mechanisms between the growing oxide scales and applied coatings can be classified according to three types.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume521
Pages (from-to)16-29
ISSN0925-8388
DOIs
Publication statusPublished - 2012

Keywords

  • Oxidation
  • Microstructure
  • Diffusion
  • Surfaces and interfaces
  • Fuel cells
  • Coating materials

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