| 황산티타늄의 첨가가 판상 α-Al2O3의 결정성장에 미치는 영향 |
| 박병기, 조선미, 이정민 |
| 한국화학연구원 화학공정 연구센터 |
| Effect of Titanium Sulfate Addition on Crystal Growth of the Flaky α-Al2O3 |
| Byung-Ki Park, Sun-Mi Cho, Jung-Min Lee |
| Center of Chemical Engineering, Korea Research Institute of Chemical Technology |
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| ABSTRACT |
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To prepare the complex gel of flux and pseudo-boehmite used in precursor of the flaky ${alpha}-A1_2O_3$ crystal, aqueous solution of the mixture of sodium carbonate and sodium phosphate was added with stirring in aqueous solution of the mixture of sodium sulfate, potassium sulfate and titanium sulfate. The complex gel was dried at $110^{circ}C$ and was crystallized above $1,050^{circ}C$, and then the effect of the amount of titanium sulfate on size, morphology, thickness and crystal size distribution of the flaky ${alpha}-A1_2O_3$ crystal was investigated. Addition of titanium sulfate was prevented the aggregation and generation of twin crystal, and had an effect on the crystal size and the thickness during crystal growth. When the amount of titanium sulfate was more than 6 g, particle size was decreased but was free from crystal twining and aggregation. On the other hand, when the amount of titanium sulfate was lower than 6 g, crystal size was increased but crystal twinning and aggregation were noticed. |
| Key words:
Pseudo-boehmite, Molten-salt, Pearlescent substrate, Filler |
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