High temperature oxidation resistance of magnetron-sputtered homogeneous CrAlON coatings on 430 steel

The requirements of low cost and high-temperature corrosion resistance for bipolar interconnect plates in solid oxide fuel cell stacks has directed attention to the use of metal plates with oxidation resistant coatings. We have investigated the performance of steel plates with homogenous coatings of...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 194; no. 13; p. 132004
Main Authors Garratt, E, Wickey, K J, Nandasiri, M I, Moore, A, AlFaify, S, Gao, X, Kayani, A, Smith, R J, Buchanan, T L, Priyantha, W, Kopczyk, M, Gannon, P E
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2009
Subjects
Atomic force microscopy
Backscattering
Coatings
Combinatorial analysis
Composition
Corrosion resistance
High temperature
Magnetron sputtering
Metal plates
Nuclear fuels
Nuclear reactions
Oxidation
Oxidation resistance
Oxynitrides
Partial pressure
Physics
Solid oxide fuel cells
Steel plates
Surface properties
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Summary:The requirements of low cost and high-temperature corrosion resistance for bipolar interconnect plates in solid oxide fuel cell stacks has directed attention to the use of metal plates with oxidation resistant coatings. We have investigated the performance of steel plates with homogenous coatings of CrAlON (oxynitrides). The coatings were deposited using RF magnetron sputtering, with Ar as a sputtering gas. Oxygen in these coatings was not intentionally added. Oxygen might have come through contaminated nitrogen gas bottle, leak in the chamber or from the partial pressure of water vapors. Nitrogen was added during the growth process to get oxynitride coating. The Cr/Al composition ratio in the coatings was varied in a combinatorial approach. The coatings were subsequently annealed in air for up to 25 hours at 800 oC. The composition of the coated plates and the rate of oxidation were characterized using Rutherford backscattering (RBS) and nuclear reaction analysis (NRA). Surface characterization was carried out using Atomic Force Microscopy (AFM) and surfaces of the coatings were found smooth on submicron scale. From our results, we conclude that Al rich coatings are more susceptible to oxidation than Cr rich coatings.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/194/13/132004