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J. Korean Ceram. Soc. > Volume 38(9); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(9): 834.
m-지르코니아와 Yag 졸로부터 지르코니아계 전해질 제조 및 물성
강건택, 임경란, 남석우, 김창삼, 이영수1, 유한일1
한국과학기술연구원 재료연구부
1서울대학교 재료공학부
Preparation and Properties of Zirconia-based Electrolytes from m-Zirconia and Yag Sol
Keon-Taek Kang, Kyoung R. Han, Suk-Woo Nam, Chang-Sam Kim, Young-Soo Lee1, Han-Ill Yoo1
Division of Materials Science, Korea Institute of Science and Technology
1School of Materials Science and Engineering, Seoul National University
Attempts were made to improve mechanical properties of zirconia-based electrolyte by preparing yttria-stabilized cubic zirconia/alumina composite. It was performed by precipitating Yag precursor in aqueous m-zirconia slurry. The powder was separated and then followed by heat treatment with expecting yttria to react with m-$ZrO_2$ to give yttria stabilized zirconia and alumina to be dispersed homogeneously. When 17.8wt% Yag(6.3mol% $Y_2O_3$) was used, fracture toughness and strength were substantially improved from 1.44MPa${cdot}m^{1/2}$ and 270Mpa for YZ8Y to 3.62MPa${cdot}m^{1/2}$ and 447MPa respectively, but electrical conductivity at $^{circ}$C in air was decreased from 0.126 to 0.057${Omega}^{-1}cm^{-1}$. It seemed due to the presence of small amount of tetragonal zirconia. But when 21.58wt% Yag(8.0mol% $Y_2O_3$) was added, fracture toughness of 2.93MPa${cdot}m^{1/2}$ and flexural strength of 388MPa were obtained with electrical conductivity of ${Omega}^{-1}cm^{-1}$.
Key words: Cubic zirconia, Alumina, Electrolyte, Yag, m-Zirconia
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