Crofer22和STS444合金高温氧化和导电性能的比较  

Comparative study on oxidation behavior and electrical conductivity of Crofer22 and STS444 alloys

作　　者：金光熙[1] 杨莹[1] 徐丹[1] 乔利杰[2] 

机构地区：[1]吉林化工学院理学院,吉林132022 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《电源技术》2009年第12期1068-1071,共4页Chinese Journal of Power Sources

基　　金：吉林省科技发展计划项目(200705C10)

摘　　要：在700℃下,对两种铁素体不锈钢STS444和Crofer22的高温氧化行为和高温导电性做了比较研究。研究表明:对于STS444合金,由于挥发性Mo的氧化物(MoO3)在氧化膜中形成,导致氧化膜疏松,不适合直接做SOFC连接体材料;对于Crofer22合金,由于氧化膜的外层主要生成含Fe的(Mn,Cr,Fe)3O4尖晶石结构相,它不仅能抑制Cr2O3的挥发,而且具有良好的高温导电性,适合做SOFC连接体材料。最后对STS444合金和Crofer22合金的氧化和导电机制进行了讨论。The oxidation behavior and electrical conductivity of two kinds of ferritic stinless steels STS444 and Crofer22 at elevated temperature （700 ℃） were studied in this paper. The results show that STS444 alloy is not suitable for SOFC interconnect materials because the formation of volatilizing MoO3 on the oxidation film results in the loosening of oxidation film. However, Crofer22 alloy can be one of the candidates for SOFC interconnect materials since the outer layer of alloy oxidation film mainly consists of （Mn,Cr,Fe）3O4 spinel phase containing Fe element which can not only suppress the volatilization of Cr2O3, but also has good elevated temperature conductivity. Finally, the mechanisms of oxidation and electrical conductivities of STS444 and Crofer22 alloys are discussed in this study.

关 键 词：固体氧化物燃料电池 FE-CR合金 连接体 氧化膜 合金元素 

分 类 号：TM911.4[电气工程—电力电子与电力传动]