Abstract: 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.

Key words: 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.