Four metallic alloys, namely 2205 duplex stainless steel (2205DSS), ZMG232, and stainless steels SS430 and SS304 are investigated for use as interconnects in solid oxide fuel cells (SOFCs). A La0.67Sr0.33MnO3–δ (LSMO) film is deposited on these metallic-alloy substrates using a pulsed-DC magnetron sputtering system in the reactive mode, leading to the formation of a cubic perovskite structure. The coated alloys are then subjected to oxidizing heat treatments in air at 600 °C, 700 °C, 800 °C, and 900 °C, and their microstructures as well as electrical resistances are evaluated. The electrical resistance measurements are performed at 800 °C, and the area-specific resistance (ASR) of the film-coated 2205DSS alloy is found to be less than that of the uncoated alloy. This is because a thick layer of Cr2O3 and a (Mn, Fe)Cr2O4 spinel phase layer are formed, and some divalent metallic ions migrate into the Cr2O3 layer. It is found that alloys coated with a thin film of LSMO are more suitable for use as metallic interconnects in SOFCs with intermediate-temperature operating ranges.
Evaluation of Protective La0.67Sr0.33MnO3–δ Coatings on Various Stainless Steels Used for Solid Oxide Fuel Cell Interconnects
Chung-li, 320 Taiwan, ROC
Longtan, Taoyuan 32546, Taiwan ROC
Chung-li, 320 Taiwan, R. O. C.
Hsinchu, 300 Taiwan R. O. C.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received October 2, 2012; final manuscript received December 19, 2012; published online March 21, 2013. Assoc. Editor: Masashi Mori.
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Huang, J., Chu, C., Yang, P., Chang, T., Lee, S., and Yang, J. (March 21, 2013). "Evaluation of Protective La0.67Sr0.33MnO3–δ Coatings on Various Stainless Steels Used for Solid Oxide Fuel Cell Interconnects." ASME. J. Fuel Cell Sci. Technol. April 2013; 10(2): 021004. https://doi.org/10.1115/1.4023579
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