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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Al2O3掺杂对YSZ固体电解质烧结及电性能的影响

利明1; 何莉萍1; 陈宗璋1; 李素芳1; 向兰翔2; 罗上庚2; 邹长贵2; 梁雪元2   

  1. 1. 湖南大学化学化工学院， 长沙 410082; 2。中国原子能研究院， 北京 102413
  • 收稿日期:2003-04-07 修回日期:2003-06-23 出版日期:2004-05-20 网络出版日期:2004-05-20

Effects of Alumina on the Sintering and Conductivity of Yttria-Stabilized Zirconia

LI Ming1; HE Li-Ping1; CHEN Zong-Zhang1; LI Su-Fang1; XIANG Lan-Xiang2; LUO Shang-Geng2; ZOU Chang-Gui2; LIANG Xue-Yuan2   

  1. 1。 Department of Cbemistry and Chemical Engineering; Hunan University Changsha 410082; China； 2。 Atomic Energy Academy of China; Beijing 102413; China
  • Received:2003-04-07 Revised:2003-06-23 Published:2004-05-20 Online:2004-05-20

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摘要： 研究了用常规共沉淀法掺杂Al2O3对YSZ固体电解质的烧结及电性能的影响.结果表明:适量的Al2O3能提高YSZ材料的烧结性能,促使其致密化,但过量的Al2O3对材料的致密化不利;同时,材料的晶界电导随Al2O3含量的增大表现出先增大后减小的变化趋势,这与Al2O3对YSZ晶界两方面的不同影响有关,Al2O3偏析于晶界一方面能清除晶界上对氧离子电导不利的SiO2,但另一方面也会降低晶界空间电荷层中的自由氧离子空穴的浓度.

关键词: 氧化锆, Al2O3, 氧离子空穴, 空间电荷层

Abstract: The effects of the alumina doped through the normal co-precipitation on the sintering and conductivity of
Yttria-stabilized zirconia were studied. The study shows that proper addition of alumina can accelerate the process of sintering and improve the
sintering density of zirconia, but it does harm to the sintering density of YSZ if the content of alumina is too high; the grain-boundary conductivity
increases at first and then decreases with increasing content of added alumina. The reason why grain-boundary conductivity changes with the content of alumina
is that alumina segregated to the grain boundary has two opposite effects on the grain boundary: at one side it can scavenge silicon dioxide which blocks
ionic transport at the grain boundary, at the other side it decreases the free oxygen ion vacancy concentration.

Key words: zirconia, alumina, oxygen ion vacancy, space charge layer

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