SOFC金属连接体材料的高温氧化和导电性能  

Oxidation Kinetics and Electrical Conductivity of Heat Resistant Alloys Used as SOFC Metallic Interconnects

作　　者：蒲健[1] 华斌[1] 杨杰[1] 李箭[1] 

机构地区：[1]华中科技大学材料科学与工程学院塑性成形模拟及模具技术国家重点实验室,湖北武汉430074

出　　处：《钢铁研究学报》2007年第10期34-39,共6页Journal of Iron and Steel Research

基　　金：国家"863"计划资助项目(2006AA03Z227);湖北省自然科学基金资助项目(2006ABD004)

摘　　要：以固体氧化物燃料电池(SOFC)金属连接体为研究对象,分析了SUS 430铁素体不锈钢和Haynes 230合金在阴极气氛(空气)中模拟SOFC的高温氧化行为。利用薄膜X射线衍射技术研究了合金氧化物的相组成及演化过程,通过扫描电镜观察分析了合金氧化物表面的微观形貌和厚度。结果表明,两种合金的表面均形成了多层氧化物,它们依次为基体/Cr2O3/MnCr2O4尖晶石相。两种氧化物相分别形成于不同的氧化动力学阶段。氧化动力学外推和氧化物面比电阻估算结果表明,两种合金的高温氧化和导电性能均可满足作为SOFC金属连接体的使用要求。In order to use metallic interconnect as solid oxide fuel cells （SOFC）, the high temperature oxidation behavior of SUS 430 alloy and Haynes 230 alloy has been investigated, simulating the condition in SOFC cathode atmosphere （air）. The oxidation behaviors of the samples such as phase constitution and microstructure of oxide scale were analyzed by XRD and SEM. The experimental results showed that a duplex oxide scale was observed, in which the MnCr2O4 layer was formed on the top of Cr2 O3 layer which was well adhered to the substrate. Formation and growth of two phase corresponded to different oxidation kinetics stages. The high temperature oxidation capability and area specific resistance were estimated synthetically when a parabolic oxide growth is assumed, demonstrating the suitability of the interconnect application of two alloy in SOFC.

关 键 词：固体氧化物燃料电池 金属连接体 面比电阻 氧化动力学 

分 类 号：TG174.32[金属学及工艺—金属表面处理]