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Zirconium Powder Preparation from ZrO2 by Calciothermic Reduction

칼슘열환원(熱還元)에 의한 ZrO2로부터 지르코늄 분말(粉末) 제조(製造)

  • Ha, Jung-Woo (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Jang, Yong-Ik (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Sohn, Ho-Sang (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 하정우 (경북대학교 금속신소재공학과) ;
  • 장용익 (경북대학교 금속신소재공학과) ;
  • 손호상 (경북대학교 금속신소재공학과)
  • Received : 2012.07.09
  • Accepted : 2012.10.08
  • Published : 2012.12.31
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Abstract

In this study, direct reduction of $ZrO_2$ using liquid calcium was investigated. The influence of molar ratio of Ca and $ZrO_2$, reaction time and temperature on the reduction behavior of $ZrO_2$ was studied. Experiments were conducted in a closed stainless steel chamber under Ar atmosphere during 5 to 60 minutes. Most of the $ZrO_2$ was reduced to Zr in 5 minutes at 1223 K and 3 Ca/$ZrO_2$ molar ratio. The minimum oxygen content in reduced metal Zr was obtained about 0.66 wt% at 1373 K after 30 minutes and 4 Ca/$ZrO_2$ molar ratio. The morphology of zirconium powder obtained was highly affected by the reaction temperature and reaction time.

본 연구에서는 액상 칼슘에 의한 $ZrO_2$의 직접환원에 대하여 조사하였다. $ZrO_2$의 직접환원에 미치는 Ca과 $ZrO_2$의 몰비, 반응시간, 그리고 반응온도의 영향에 대하여 검토하였다. 실험은 5분에서 60분까지 Ar 분위기의 밀폐된 스테인리스강제의 반응기에서 실시하였다. 반응온도 1223 K, Ca과 $ZrO_2$의 몰비가 3 이상인 조건에서 대부분의 $ZrO_2$는 5분만에 Zr으로 환원되었다. 반응온도가 1337 K이고 Ca을 이론적인 양의 2배를 첨가한 경우 금속 Zr 중의 산소농도는 최저 0.66 wt%를 나타내었다. 그리고 Zr 입자의 형상은 반응온도와 반응시간에 큰 영향을 받는 것으로 나타났다.

Keywords

Acknowledgement

Supported by : 경북대학교

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