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Received November 15, 2014
Accepted December 15, 2014
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Molten-salt 방법에 의해 합성되는 판상형 알루미나 분말의 입성장 거동에 미치는 Salt의 영향
Effect of Salt on Crystal Growth of Plate-like Alumina Particles by Molten-salt Method
Bo Yeon Kim1 2
Yoon Joo Lee1 3
Soo Ryong Kim1 3
Woo Teck Kwon1 3
Dong-geun Shin1 3
Younghee Kim1 3†
Duck Kyun Choi2
1한국세라믹기술원 에너지효율소재팀, 08516 서울 금천구 디지털로 10길 77 2한양대학교 신소재공학과, 04763 서울 성동구 왕십리로 222
1Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology, 77 Digital-ro, 10-gil, Geumchenon-gu, Seoul 08516, Korea 2Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea 3, Korea
Korean Chemical Engineering Research, October 2015, 53(5), 603-608(6), 10.9713/kcer.2015.53.5.603 Epub 12 October 2015
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Abstract
일반적으로 결정은 계면에 따라 그 성장속도가 다르기 때문에 계면의 성장을 제어함으로써 다양한 형태의 결정입자를 얻는 것이 가능하다. 알루미나의 경우 산업적 이용범위가 다양해지고 있어, 다양한 크기 또는 종횡비가 다른 다양한 형상의 분말이 요구되기도 한다. 용융염(molten-salt)을 이용하여 세라믹 입자를 성장시킬 경우, 800~900 oC 이상에서 용융되는 salt의 조건을 변화함으로써 세라믹 입자의 결정 성장 방향을 제어할 수 있는데, 알루미나의 경우 주로 판상형으로 입자가 성장하게 되며, 이때 salt의 ionic strength에 따라 판상형으로 성장하는 결정의 성장 속도를 제어하는 것이 가능하다. 본 연구에서는 NaCl, Na2SO4, Na3SO4를 이용하여 ionic strength가 다른 다양한 salt 조건에서 알루미나 입자를 성장시켰으며, 이들이 알루미나 결정 성장에 미치는 영향과 온도, 농도 변화에 따라 형성되는 알루미나의 크기 및 형상의 변화에 관하여 연구하였다.
Alumina powder have been expanded its application in industry and required to control its morphology such as powder size and aspect ratio of single particle. It can be synthesized by molten - salt method which is possible to obtain various shapes of ceramic particles by controlling the growth direction because each crystal face has different growth rate. In this study, various combinations of salts such as NaCl, Na2SO4, Na3PO4 and their mixture were used for control the growth of plate like alumina particle from the initial stage of synthesis because salt having different ionic strength can control the growth direction of ceramic particle under its melting condition around 800~900 °C, and growth behavior of plate-like alumina particle with different reaction conditions such as temperature and concentration on the crystal size and shape was studied.
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