Protective coating on stainless steel interconnect for SOFCs: oxidation kinetics and electrical properties

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• 作者：Chen ; Xuan ; Hou ; Peggy Y. ; Jacobson ; Craig P. ; Visco ; Steven J. ; De Jonghe ; Lutgard C.
• 关键词：Interconnect ; Stainless steel ; Cr₂O₃ ; SOFC ; ASR
• 刊名：Solid State Ionics
• 出版年：2005
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：February 14, 2005
• 卷：176
• 期：5-6
• 页码：425-433
• 文件大小：732 K

摘要

An effective, dense and well adherent coating was produced on 430SS that has the result of significantly reducing the oxidation rate of this alloy at elevated temperatures. The coating is essentially a Mn芒芒芒Co芒芒芒O spinel, applied in powder form, and compacted to improve its green density. A simplified model is presented that allows an assessment of the effects of the contact and scale geometries. For 850 芒芒C, an area specific resistance (ASR) can be predicted of approximately 0.5 芒芒 cmp>2p>, after 50,000 h in air, taking into account a factor of 10 penalty for unfavorable contact geometries. The effect of the densified Mn芒芒芒Co spinel coating is to reduce significantly Cr₂O₃ sub-scale formation, lower the thermal expansion mismatch, and increase the electronic conductivity of the scale.