한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제50권3호
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  • Pages.180-185
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  • 2013
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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고온가압으로 소결한 고순도 이트리아 세라믹 소결체의 산화반응 특성

Characteristics of Thermal Oxidation on Hot-Pressed Pure Yttria Ceramics

  • 최진삼 (경상대학교 세라믹공학전공) ;
  • 신동우 (경상대학교 세라믹공학전공) ;
  • 배원태 (경상대학교 세라믹공학전공)
  • Choi, Jinsam (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Shin, Dong Woo (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Bae, Won Tae (Department of Ceramic Engineering, Gyeongsang National University)
  • 투고 : 2012.11.10
  • 심사 : 2013.04.29
  • 발행 : 2013.05.31
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초록

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.

키워드

참고문헌

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피인용 문헌

  1. 하소이트리아 소결체의 특성과 플라즈마저항성 평가 vol.50, pp.5, 2013, https://doi.org/10.4191/kcers.2013.50.5.348