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http://dx.doi.org/10.4191/kcers.2014.51.6.560

Formation of Asperites on the Plate-like Alumina Particles by Molten-salt Method  

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)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.6, 2014 , pp. 560-565 More about this Journal
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
Asperite; Crystal growth; Alumina; Capping agent; Molten-salt;
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