Abstract
Duplex stainless steel (2205DSS) is being considered as a potential interconnect material for SOFC. The protection layers, LSCF and LSCF-Ag, were chosen, and the electrical properties and oxidation resistance of coating layers on 2205DSS were examined. The LSCF layer was coated on 2205DSS (2205LSCF) by screen printing and was sintered at 1000℃. LSCF was sintered in N2 atmosphere without decomposition, and only a thin oxide layer formed between LSCF and the alloy. The area specific resistance measurements from 500℃ to 750℃ were conducted, and the result showed that the area specific resistance (ASR) of 2205LSCF was less than that of LSM-coated specimens, because LSCF has higher electronic conductivity. The results of ASR measurement at 750℃ as a function of holding time implied that the lower ASR of 2205LSCF was due to the formation of Cr-Mn spinel only. The incorporation of Ag in the LSCF layer was found to be an ineffective way to reduce ASR over the entire range from 500℃ to 750℃. It is concluded that screen printed LSCF-coated 2205DSS is adequate for metallic interconnects.
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