Effect of Processing Methodology on Microstructure and Ionic Conductivity of Yttria-Stabilized Zirconia

In this study, different methodologies were used for preparing commercial zirconia-8 mol% yttria sintered specimens. Powder compacts were conformed by uniaxial or by a combination of uniaxial and cold isostatic pressing. The sintering of powder compacts was carried out by the two-step sintering process and the results were compared to those of conventionally sintering specimens. The use of combined pressing procedures and two-step sintering process allowed for obtaining sintered specimens with high densities, small grain sizes and with minor differences in the electrical conductivity, which should improve the mechanical properties without compromising the electrical behavior at high temperatures.