CeO_2掺杂对La_(0.7)Ca_(0.3)CrO_(3-δ)低温烧结及电导性能的影响  

Influence of CeO_2-doping on Low-temperature Sintering Ability and Electrical Conductivity of La_(0.7)Ca_(0.3)CrO_(3-δ)

作　　者：王松林[1,2] 凤仪[2] 王东生[1] 王泾文[1] 孟广耀[3] 

机构地区：[1]铜陵学院机械工程系,安徽铜陵244061 [2]合肥工业大学材料科学与工程学院,安徽合肥230009 [3]中国科学技术大学材料科学与工程系,安徽合肥230026

出　　处：《材料科学与工程学报》2012年第3期409-412,435,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(21171131);安徽省自然科学基金资助项目(1208085QE84);安徽省高等学校省级优秀青年人才基金重点资助项目(2012SQRL190ZD);安徽省高等学校省级自然科学研究资助项目(KJ2011B185)

摘　　要：LaCrO3基固体氧化物燃料电池(SOFC)连接材料存在难以在空气中致密化烧结、中温电导率差等缺陷。本文利用自燃烧工艺(auto-ignition process)制备La0.7Ca0.3CrO3-δ高活性粉体,掺入2%～8%(质量分数)CeO2作为烧结助剂,在1 400℃空气气氛下烧结获得了95.4%以上的高致密度,并且随着CeO2掺杂量的增加晶粒逐渐细化;掺入2%CeO2时La0.7Ca0.3CrO3-δ烧结样品的电导率最高,在空气中850℃达到52.7Scm-1,500℃时也能达到41.9Scm-1,约为同等条件下未掺杂La0.7Ca0.3CrO3-δ电导率的2.5倍,完全能够满足中温固体氧化物燃料电池连接材料的使用要求。LaCrO3-based interconnect material for solid oxide fuel cells（SOFCs） is poorly sinterable in air and has relatively low electrical conductivity at intermediate temperatures.In this work,fine precursor powders of La0.7Ca0.3CrO3-δ were prepared by introducing an auto-ignition process,and then sintering in air at 1 400℃ for 4h using a small amount of CeO2 as sintering aid（2%-8%,weight percent）.Results indicate that the doped specimens sintered at 1 400℃ for 4h in air have high relative densities of no less than 95.4% and the grain size decreases with increasing the doping amount.The 2% CeO2-doped La0.7Ca0.3CrO3-δ sample has the highest electrical conductivity of 52.7 Scm-1 at 850℃ and 41.9Scm-1 at 500℃ in air,almost 2.5 times as high as that of La0.7Ca0.3CrO3-δ.Results indicate this interconnect composite is very suitable for intermediate temperature SOFCs.

关 键 词：铬酸镧 烧结 电导率 固体氧化物燃料电池 

分 类 号：TB321[一般工业技术—材料科学与工程] TK91[动力工程及工程热物理]