Zn掺杂对YCrO_3基连接材料低温烧结和电导性能的影响  

Influence of Zn-doping on low-temperature sintering ability and electrical conductivity of YCrO_3-based ceramic interconnect materials

作　　者：王松林[1] 王泾文[1] 王东生[1] 孟广耀[2] 

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

出　　处：《材料热处理学报》2013年第2期5-9,共5页Transactions of Materials and Heat Treatment

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)

摘　　要：YCrO3基固体氧化物燃料电池(SOFC)连接材料与LaCrO3基连接材料相比具有更高的化学稳定性,但却难以在空气中致密化烧结。利用溶胶-凝胶工艺在Y0.8Sr0.2CrO3-δ的B位掺杂10 mol%的Zn制备Y0.8Sr0.2Cr0.9Zn0.1O3-δ高活性粉体,在1400℃空气中烧结获得了96.6%的高致密度,并且仍然保持单一正交钙钛矿相结构,远高于同条件下Y0.8Sr0.2CrO3-δ的76.4%的烧结致密度。Y0.8Sr0.2Cr0.9Zn0.1O3-δ烧结样品遵从小极子导电机理,850℃空气中的电导率达到3.7 S.cm-1;热膨胀系数为9.4×10-6K-1,与YSZ相接近,表明Y0.8Sr0.2Cr0.9Zn0.1O3-δ是一种稳定易烧结的适合YSZ基SOFC的新型陶瓷连接材料。Comparing with LaCrO3-based solid oxide fuel cell （SOFC） interconnect materials, YCrO3 has higher chemical stability in SOFC fabricating and manufacturing conditions. However, it is more difficult for YCrO3 to be densely sintered at a cell co-firing temperature in air. By a sol-gel process, highly reactive powders of Y0.8Sr0.2CrO3-δ （YSCZ） were prepared by doping 10 mol% Zn into the B-site of Y0.8Sr0.2CrO3-δ. Results indicate the YSCZ specimen sintered at 1400 ℃ in air has a high relative density of 96.6% , much higher than that of Yo.s Sro 2 CrO3-8 sintered at the same temperature （relative density 76.4% ） , and still shows a pure orthorhombic perovskite structure. The densely sintered YSCZ sample shows a remarkable electrical conductivity of 3.7 S. cm^ -1 at 850 ℃ in air and still obeys the small polaronic conduction mechanism. YSCZ also has a very suitable thermal expansion coefficient value of 9.4 x 10^6 K^1. These investigations have indicated that YSCZ is a promising stable and easily sintered interconnect material for co-fired YSZ-based SOFCs.

关 键 词：铬酸钇 掺杂 烧结 溶胶-凝胶工艺 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]