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J. Korean Ceram. Soc. > Volume 51(6); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(6): 560.
doi: https://doi.org/10.4191/kcers.2014.51.6.560
Molten-salt 방법에 의해 합성되는 판상형 알루미나 분말 표면에 돌기형성 거동
이윤주, 김보연, 신동근, 김수룡, 권우택, 김영희
한국세라믹기술원 에너지효율소재팀
Formation of Asperites on the Plate-like Alumina Particles by Molten-salt Method
Yoon Joo Lee, Bo Yeon Kim, Dong-Geun Shin, Soo Ryong Kim, Woo Teck Kwon, Younghee Kim
Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology
ABSTRACT
Alumina nano-asperites were grown on plate-like alumina particles of which the surface had been covered with a capping agent to control the asperite formation sites on the particles. Utilized alumina source for asperite was nano sized ${gamma}$-alumina, which was prepared by calcination of $Al(OH)_3$ at $600^{circ}C$; silica suspension was used as the capping agent. Plate like alumina particles were covered by silica suspension and continuously heat-treated to $900^{circ}C$ with nano sized ${gamma}$-alumina, as the source material, under molten-salt atmosphere. Asperite growing site were controlled by the degree of coating of the capping agent; 10-20 nanosize of ${theta}$-alumina were formed on the particle surface. On the other hand, alumina particles without capping agent were observed to undergo only step-like crystal growth during heat-treatment.
Key words: Asperite, Crystal growth, Alumina, Capping agent, Molten-salt
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