Preparation of Ceria-stabilized Zirconia Ceramics with Irregular Grain Shape

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J. Korean Ceram. Soc. > Volume 36(4); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(4): 372.

불규칙 입자형상을 갖는 세리아 안정화 지르코니아 세라믹스의 제조

강현희, 이종국

조선대학교 재료공학과

Preparation of Ceria-stabilized Zirconia Ceramics with Irregular Grain Shape

ABSTRACT

Hihg-toughened ceria-stabilized tetragonal zirconia ceramics with irregular grain shape and undulated grain boundary was prepared by ceria doping. Irregularity of grain shapes was increased with the amount of doped ceria. But in case of the large amount of doped ceria grain boundary was migrated to the reverse direction of DIGM. Ceria-stabilized zirconia ceramics annealed at 1650$^{circ}C$ for 2h after twice dippings into cerium nitrate solu-tion of 0.2M and sintering at 1500$^{circ}C$ for 2h showed the highest grain boundary length with a value of 23.6$mutextrm{m}$ Ceria concentration difference between convex and concave sides in irregular grains was observed over 1 mol% but not observed in normal grains, Specimens with normal grain shape showed intergranular fracture mode whereas the specimens with irregular grain shape showed transgranular fracture mode.

Key words: Ceria-stabilized zirconia, Ceria Doping, Irregular grain shapes, Fracture toughenss