Interaction mechanisms between slurry coatings and solid oxide fuel cell interconnect alloys during high temperature oxidation
Publication: Research - peer-review › Journal article – Annual report year: 2012
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.
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- Oxidation, Microstructure, Diffusion, Surfaces and interfaces, Fuel cells, Coating materials