【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。更多还原

【Abstract】 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 Cr2O3 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.更多还原