材料期刊网

为研究钙稳定氧化锆质材料的高温电性能,以CaO为稳定剂,分别按照4mol％、8mol％和12mol％的掺杂量,与化学法制备的高纯氧化锆细粉混合,于模压法成型后,经1710℃×2h烧成制得试样.采用XRD和SEM分别对试样相组成和显微结构进行了分析,测定了不同试样室温到1350℃的电导率.实验结果表明:随着CaO掺杂量的增加,试样中立方相氧化锆含量增加,单斜相含量明显减少;试样的电导率随稳定剂掺杂总量的增加呈上升趋势,且随着测试温度的升高而增大;不同相组成使氧化锆材料在高低温区电导率存在着差异,其中立方相含量的增加有助于电导率的提高.

The calcium-stabilized zirconia materials were prepared by using high-purity monoclinic zirconia powders as raw material,and adding various content of 4mol％ 、8mol％ and 12mol％ CaO as stabilizer,respectively,the high-temperature conductivity of calcia-stabilized zirconia was investigated.After shaped by compression molding process and then sintered at 1710 ℃ for 2 h,the phase composition and microstmcture of the obtained samples were characterized through X-ray diffractometer and scanning electron microscope,and then the conductivity of zirconia materials was tested from room temperature to 1350 ℃.The results show that the content of cubic zireonia increases,while the content of the monoclinic phase decreases obviously as the addition of stabilizers increasing.The conductivity value of the sintered samples increases as the content of CaO and testing temperature increasing.The difference of phase composition results in the different conductivity whenever at lower or higher temperature zones for the calcia-stabilized zirconia,and the increase of the cubic phase content is helpful to improve the conductivity value.