WANG Yang 1, CHEN Han 1, GUO Lucun 1, YIN Bo 2
(1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China;
2.YiXing Morgan Thermal Ceramics Co., Ltd., Yixing 214200, Jiangsu, China)
Abstract: Mechanical milling was conducted on 8YSZ (8mol% yttria stabilized zirconia) mixtures using planetary ball mill equipped with 3YSZ (3mol% yttria stabilized zirconia) ceramic liner and nylon vials (separately denoted as PMZ and PMN). The particle size analysis results showed that the saturation values for the final apparent particle sizes of 8YSZ mixtures were 0.42 μm and 0.89 μm, by means of PMZ and PMN, respectively. The ionic conductivities of 8YSZ via different milling processes were measured by electrochemical impedance spectroscopy (EIS) within the temperature range of 500-800 ℃ and found to increase with the decreasing of the apparent particle sizes (0.42 to 1.43 μm). Furthermore, due to the inherent contamination of 3YSZ (3mol% yttria stabilized zirconia) powders introduced by the abrasion of 3YSZ balls against the chamber, the supplementing yttria (0.44mol%) led to an increase of ionic conductivity by 10% (0.0283 S·cm-1) at 800 ℃.
Key words: mechanical milling; 8mol% ; ionic conductivityttria stabilized zirconia