Zn掺杂对YCrO3基连接材料低温烧结和电导性能的影响
Transactions of Materials and Heat Treatment(2013)
Abstract
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Y0.8Se0.2CrO3-δ的B位掺杂10 mol%的Zn制备Y0.8Sr0.2Cr0.9Zn01O3-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Y0.8 Sr0.2 CrO3-δ的76.4%的烧结致密度.Y08Sr02Cr09Zn01O3-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Y08Sr02Cr0.9Zn01O3-δ是一种稳定易烧结的适合YSZ基SOFC的新型陶瓷连接材料.
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Key words
sol-gel process,sintering ability,yttrium chromite,doping,solid oxide fuel cell(SOFC)
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