稀土对铁素体Fe-22Cr合金抗氧化性和导电性能的影响  

Effect of Rare Earths on Electrical Conductivity and Oxidation Resistance of Ferritic Fe-22Cr Alloys

作　　者：金光熙[1] 杨莹[1] 赵国明[1] 王丽南[1] 乔利杰[2] 

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

出　　处：《中国稀土学报》2008年第4期469-475,共7页Journal of the Chinese Society of Rare Earths

基　　金：吉林省科技发展计划项目(200705C10)资助

摘　　要：研究了800℃下稀土元素对铁素体合金高温导电性和抗氧化性的影响,同时选择合适的合金元素组成,用SEM,EPMA,SIMS和GDS等技术来分析主要元素和微量元素对氧化膜生长和导电性影响。在合金中添加不同种类和不同量的稀土元素对合金的抗氧化性和导电性的影响较大,添加Y和La可以大幅度地提高电导率,而添加Ce对电导率的影响不大。考虑耐氧化性、高温导电性和热膨胀系数,含有0.06%Y的Fe-22Cr-0.5Mn合金更适合做SOFC的连接体。The effect of various rare-earth elements on contact electric resistance and oxidation resistance of Fe-22Cr-0. 5Mn ferritic alloys at 800 ℃ was investigated. Proper chemical compositions of ferritic alloys was determined, and the effects of the major and trace elements on the formation of oxide scale and the electric conductivity were analyzed by SEM, EPMA, SIMS and GDS. It was found that the addition of different kinds and amounts of rare-earth elements into alloys was very effective to influence the oxidation resistanceand the electric conductivity of ferritic Fe-22Cr-0.5Mn alloy. The addition of Y and La into alloy had great effect on increasing the electrical conductivity. However, the addition of Ce did not influence greatly electrical conductivity. In consideration of the oxidation resistance, high temperature electric conductivity and thermal expansion coefficient, the Fe-22Cr-0.5Mn-0. 06Y alloy was more suitable for the interconnect of SOFC.

关 键 词：FE-CR合金 固体氧化物燃料电池 连接体 氧化膜 稀土 

分 类 号：TG171[金属学及工艺—金属表面处理] TF845[金属学及工艺—金属学]