本研究以2205雙相不銹鋼(2205DSS)網印La0.7Sr0.3MnO3 (LSMO)漿料(2205LSM)，其在氮氣氣氛高溫燒結後作為固態氧化物燃料電池(SOFC)金屬雙極板材料，並於SOFC操作800℃空氣氣氛的操作環境，比較2205DSS與2205LSM的高溫氧化行為與電性行為差異。實驗結果顯示，2205LSM在1200℃氮氣氣氛燒結，LSMO會分解成其他氧化物。燒結溫度降低至1100℃，不但LSMO未分解亦完成燒結，同時界面間僅形成單層且薄的氧化皮膜。2205LSM於800℃空氣，因有LSMO層及界面間緻密氧化皮膜隔絕氧對合金底材的氧化，可有效降低氧化速率達2.2個數量級。2205DSS與2205LSM短時間電阻量測實驗顯示，預氧化96小時試片的ASR(Area specific resistance)均低於預氧化48小時試片的ASR。2205DSS於800℃長時間電阻量測，ASR分三個階段改變，初期主要為Cr2O3成長，ASR以較快速率增加，第二階段反而以緩慢速率減少，最後階段ASR以類似於拋物線率增加。而2205LSM的全程長時間電阻量測，ASR則相似於2205DSS的第二階段以緩慢速率減少。ASR減少的原因是氧化皮膜的(Cr, Mn)3O4比例提高及(Cr, Mn)3O4中Mn的含量上升或二價價金屬離子摻雜Cr2O3所致。

　　The effect of La0.7Sr0.3MnO3 (LSMO) coating on the electric properties and oxidation resistance of 2205 duplex stainless steel (2205DSS) was examined at 800℃ in air. The LSMO was coated on 2205DSS (2205LSM) by screen printing and was sintered over the temperature range from 1000 to 1200℃ in N2. As the 2205LSM sintered at 1200C, the LSMO decomposed into La1-xSrxMnO3±δ, (La1-xSrx)2MnO4±λ, MnO, La2O3 and SrO. However, the LSMO was stable and only a thin oxide-scale formed between the LSMO layer/alloy interface, if the sintering temperature was lower to 1100℃. The LSMO layer prevented oxygen react with the alloy, as a result the oxidation rate of 2205LSM are 2.2 order of magnitude lower than those of 2205DSS at 800℃ in air.
　　Short-term electric resistance measurements in still air as a function of temperature with pre-oxidized alloys indicate that the pre-oxidized of 2205DSS and 2205LSM for 96 hours are less ASR (area specific resistance) than those of 2205DSS and 2205LSM for 48 hours.
　　Long-term electric resistance measurements for 2205DSS reveal three oxidation mechanism. The formation of Cr2O3 made ASR increase comparatively fast in initial stage. The ASR reduced slowly in the second stage. The ASR showed a nearly parabolic due to diffusional growth of oxide-scale in the last stage. Long-term resistance measurements for 2205LSM without pre-oxidation indicate that the ASR reduced slowly similar to the second stage of 2205DSS. The ASR depends on the electric conductive mechanism of the oxide scale.
Keywords: 2205 duplex stainless steel, Solid oxide fuel cell, area specific resistance, High-temperature oxidation, Metallic Interconnects.

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