Study on Fabrication of High Strength and High Ionic Conductive Cubic Zirconia Ceramics

y_2o_3稳定的立方氧化锆陶瓷被认为是固体氧燃料电池（SOFC）的良好候选材料。然而，立方氧化锆的断裂强度和韧性不足以应用于刨床型SOFC电解液中。在1500℃下制备了四边形氧化锆/立方氧化锆、氧化铝/立方氧化锆和掺杂Y_2O_3- sc_2o_3的四边形氧化锆颗粒分散体系中5mol.%Y_2O_3掺杂ZrO_2的立方氧化锆复合材料，对制备高强度、高离子导电性的立方氧化锆进行了基础研究。在空气中保温12小时，断裂强度和离子电导率（在900℃时）。C)为525MPa， 0.05Scm^<-1>。断裂强度和离子电导率(在900。解析：选C。后hiping法制备的Al_2O_3晶粒分散立方氧化锆为355MPa和0.06Scm^<-1>。另一方面，2mol%Y_2O_3-6mol%Sc_2O_3掺杂的立方氧化锆的断裂强度和离子电导率分别为214MPa和0.141Scm^<-1>。上述结果表明，具有高断裂强度的高离子导电性立方氧化锆是一种优良的陶瓷材料，可作为刨床型SOFC的电解液。

Y_2O_3-stabilized cubic zirconia ceramics is considered to be good candidate materials as an solid oxygen fuel cells (SOFC). However, the fracture strength and toughness of cubic zirconia are not enough high to apply to an electrolyte of planer-type SOFC.In the present study, fundamental research on fabrication of high strength and high ionic conductive cubic zirconia were investigated in ceramics/ceramics composites of tetragonal zirconia/cubic zirconia and alumina/cubic zirconia and Y_2O_3-Sc_2O_3 doped cubic zirconia systems In the system of tetragonal zirconia grains dispersed cubic zirconia composites of 5mol.%Y_2O_3 doped ZrO_2 fabricated at 1500。C in air for 12hr, the fracture strength and ionic conductivity (at 900。C) of composites were 525MPa and 0.05Scm^<-1>. The fracture strength and ionic conductivity (at 900。C) of 20vol.%Al_2O_3 grains dispersed cubic zirconia fabricated by post-HIPing were 355MPa and 0.06Scm^<-1>. On the other hands, fracture strength and ionic conductivity of 2mol%Y_2O_3-6mol%Sc_2O_3 doped cubic zirconia were 214MPa and 0.141Scm^<-1>. These present results indicated that high ionic conductive cubic zirconia with high fracture strength were excellent ceramics as an electrolyte of planer-type SOFC.