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.
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.
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