ZrO2氧敏陶瓷的纳米制备工艺与性能研究

With the widely using of automobiles and boilers et al, the research of zirconium dioxide ceramics with high ionic conductivity and quick-sreaction capability as oxygen sensor is developed. In this paper, YSZ powders with different amount of Al2O3 doped were prepared by coprecipitation method using zirconium oxychloride and yttrium oxide as raw material. The phase composition and particle size distribution of powder were characterized by TG-DSC, XRD and TEM. The results indicated that the YSZ powders with good sintering behaviors and low agglomerated structure were prepared with the precipitation temperature of 40C-50C, dispersant agent addition of 4% mass percent, pH value of 9-11 and calcining temperature of 800C. The particle size of powder samples was around 15nm. The sintering performance was greatly ameliorated by spray pelleting method. The small and homogeneous pores in the green body could be easily eliminated as the size distribution of the powders prepared by spray pelletization method was homogeneous. The density of the sample sintered at 1500C for 4 h was 5.92g/cm3. At the test temperature of 700C, the conductivity of Al-doped 8YSZ sample was 4.6×10-3S•cm-1 and the experimental potential were approximated to theoretic potential according to Nester equation when tested at different concentration of oxygen. It could be concluded this material was a good candidate for the applications as oxygen sensor in industry boilers, automobiles and so on.