| description abstract | 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–خ´ (LSMO) film is deposited on these metallicalloy substrates using a pulsedDC 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 آ°C, 700 آ°C, 800 آ°C, and 900 آ°C, and their microstructures as well as electrical resistances are evaluated. The electrical resistance measurements are performed at 800 آ°C, and the areaspecific resistance (ASR) of the filmcoated 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 intermediatetemperature operating ranges. | |
