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J. Korean Ceram. Soc. > Volume 50(3); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(3): 180.
doi: https://doi.org/10.4191/kcers.2013.50.3.180
고온가압으로 소결한 고순도 이트리아 세라믹 소결체의 산화반응 특성
최진삼, 신동우, 배원태
경상대학교 세라믹공학전공
Characteristics of Thermal Oxidation on Hot-Pressed Pure Yttria Ceramics
Jinsam Choi, Dong Woo Shin, Won Tae Bae
Department of Ceramic Engineering, Gyeongsang National University
ABSTRACT
We investigated the characteristics of hot-pressed pure yttria ceramics, and annealed them in an oxidation atmosphere. Regardless of the heat treatment in the oxidation atmosphere, XRD analysis showed that all the samples had a $Y_2O_3$ phase without structural change. Even though the color variation of the hot-pressed $Y_2O_3$ ceramics was due to the sintering temperatures, the oxidation process turned the color of the $Y_2O_3$ ceramics into white. The color change during oxidation treatment appears to be related to oxygen defects. In addition, oxygen defects also affected the weight change and microstructure of the $Y_2O_3$ ceramics. The $Y_2O_3$ ceramic sintered at $1600^{circ}C$ had a $5.03g/cm^3$ density, which is close to the theoretical density of $Y_2O_3$. As the sintering temperature increased, small homogeneous grains grew to large grains which affected the Vickers hardness. $Y_2O_3$ ceramics hot-pressed at $1600^{circ}C$ and annealed at $1200^{circ}C$ had a flexural strength of 140MPa.
Key words: Hot-pressed yttria ceramics, Oxidation, Homogeneous grain, Density
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