Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Formation of Asperites on the Plate-like Alumina Particles by Molten-salt Method

Molten-salt 방법에 의해 합성되는 판상형 알루미나 분말 표면에 돌기형성 거동

  • Lee, Yoon Joo (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Bo Yeon (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Shin, Dong-Geun (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Soo Ryong (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kwon, Woo Teck (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Younghee (Energy Efficient Material Team, Korea Institute of Ceramic Engineering and Technology)
  • 이윤주 (한국세라믹기술원 에너지효율소재팀) ;
  • 김보연 (한국세라믹기술원 에너지효율소재팀) ;
  • 신동근 (한국세라믹기술원 에너지효율소재팀) ;
  • 김수룡 (한국세라믹기술원 에너지효율소재팀) ;
  • 권우택 (한국세라믹기술원 에너지효율소재팀) ;
  • 김영희 (한국세라믹기술원 에너지효율소재팀)
  • Received : 2014.11.24
  • Accepted : 2014.11.27
  • Published : 2014.11.30
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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.

Keywords

References

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