铬基合金连接体材料在固体氧化物燃料电池中的应用  

Cr-Based Alloy Used as Interconnect in Solid Oxide Fuel Cells

作　　者：陈鑫[1] 韩敏芳[1] 王忠利[1] 蒋先锋[1] 

机构地区：[1]中国矿业大学燃料电池联合研究中心,化学与环境工程学院,北京100083

出　　处：《稀有金属材料与工程》2007年第A02期642-644,共3页Rare Metal Materials and Engineering

基　　金：教育部科学技术研究重点项目(106087);国家高技术研究发展计划(863)项目(2005AA501050)

摘　　要：主要介绍了固体氧化物燃料电池(SOFC)的铬(Cr)基合金连接体材料的发展现状。Cr基合金具有良好的抗氧化性、耐腐蚀性和导电性能等,是目前连接体材料中的研究热点之一。在SOFC阴极环境中,容易形成氧化层,同时由于Cr的扩散和挥发还可能导致阴极中毒,合金中掺杂稀土元素(Y、La、Ce和Zr)可以抑制Cr_2O_3层的生成。在阳极环境中,Cr基合金的表现优于阴极。与Al_2O_3、NiO、MgO和TiO_2等相比,Cr_2O_3基氧化层具有较好的综合性能,其耐高温(1100℃)、热膨胀系数(9.6×10^(-6)K^(-1))和YSZ电解质(10.8×10^(-6)K^(-1))相近、且具有较好的导电性。目前,Cr基合金的研究重点是氧化物弥散强化(ODS)合金,使用最多的是Cr5FelY_2O_3,其热膨胀系数为9×10^(-6)K^(-1)～10×10^(-6)K^(-1)(1000℃),抗氧化性能较好。The status of Cr-based alloy used as interconnect in solid oxide fuel cell （SOFC） was mainly reviewed in this paper. Cr-based alloy is one of the most important materials in SOFC because of its high oxidation resistance, corrosion resistance and electrical conductivity. At cathode of SOFC, it is easy to form the oxidation scale. Simultaneously, the diffusion and volatilization of Cr may lead to the poisoning of cathode. It has been indicated that the formation of Cr2O3 scale would be restrained by the addition of lanthanon such as Y, La, Ce and Zr. However, at anode, the performances of Cr-based alloys are better than that of an cathode. Comparing to the Al2O3, NiO, MgO and TiO2, Cr2O3-based scale is of good general performances such as high temperature resistance （1100 ℃）, the similar thermal expansion eoeffieient（TEC）（9.6× 10^-6 K^-1） to YSZ electrolyte （10.8× 10^-6 K^-1） and high electrical conductivity. Presently, the oxide dispersion strengthened （ODS） alloys domain the trends of Cr-based alloys used in SOFC, in which the most representative material is Cr5FelY2O3, with the TEC （9- 10）× 10^-6 K^-1（1000 ℃） and high oxidation resistance.

关 键 词：SOFC 连接体 Cr基合金 抗氧化性 电导率 

分 类 号：TG146.45[一般工业技术—材料科学与工程] TM911.4[金属学及工艺—金属材料]