Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Zirconia Nanocrystalline Powder by the Hydrothemal Treatment at low Temperature

수열법에 의한 저온 결정형 지르코니아 나노 분말의 제조

  • Noh, Hee-Jin (Division of Metallurgical and Materials Engineering, Chosun University, B.K 21, Development of Intelligent Materials & Its Application) ;
  • Lee, Jong-Kook (Division of Metallurgical and Materials Engineering, Chosun University, B.K 21, Development of Intelligent Materials & Its Application) ;
  • Seo, Dong-Seok (School of Materials Engineering, Seoul National University) ;
  • Hwang, Kyu-Hong (Department of Materials Engineering, Gyeongsang National University)
  • 노희진 (조선대학교 금속${\cdot}$재료공학부, B.K 21, 핵심분야 지능재료 개발 및 산업화 사업단) ;
  • 이종국 (조선대학교 금속${\cdot}$재료공학부, B.K 21, 핵심분야 지능재료 개발 및 산업화 사업단) ;
  • 서동석 (서울대학교 재료공학부) ;
  • 황규홍 (경상대학교 재료공학부)
  • Published : 2002.01.01
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Abstract

The nanocrystalline zirconia powder was synthesized from the zirconium hydroxide precipitate by hydrothermal process with the reaction temperature range 100∼250$^{\circ}$C, reaction time 1∼48 hours and additive concentration 1, 5 N NaOH solutions. The lower hydrothermal treatment temperature, the inner spherical tetragonal zirconia was synthesized. The fraction of monoclinic phase zirconia with rod shape increased with increasing the hydrothermal treatment temperature. As the concentration of the NaOH solution increases, the synthesized particle in breadth and length increased; breadth and length ratio decreased. In the case of the low concentration of NaOH solution, however, the particle length became relatively larger than its breadth resulting in the rod-shaped particles with bigger aspect ratio.

$ZrOCl_2{\cdot}8H_2O$ 수용액과 $NH_4OH$ 수용액을 반응시켜 얻은 지르코니아 수화물을 반응조건으로 100∼250$^{\circ}$C, 1∼48시간과 1, 5 M NaOH 수용액에서 수열합성하여 결정형 나노크기의 지르코니아 분말을 제조하였다. 수열합성 온도가 낮을 경우 구형의 정방정상 나노입자가 합성되었으며, 합성온도가 증가하면서 입자크기의 증가 및 입자모양도 막대상으로 변하면서 결정상도 단사정상을 나타내었다. NaOH 용액의 몰 농도가 증가함에 따라 합성된 입자의 폭과 길가 크며 장단축비는 감소하였다. 반면에 NaOH 용액의 농도가 낮을 경우 입자 길이가 폭에 비해 상대적으로 크고, 이에 따라 장단축비가 큰 막대상 입자가 합성되었다.

Keywords

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