| Al2(SO4)3 용액의 가수분해에 의해 얻어진 Aluminum Hydroxides Gel의 pH가 판상 α−Al2O3의 결정성장에 미치는 영향 |
| 최동욱, 박병기1, 한명완 |
충남대학교 화학공학과
1한국화학연구원 에너지소재연구센터 |
| Effect of pH of Aluminum Hydroxides Gel Obtained by Hydrolysis of Al2(SO4)3 Solution on Crystal Growth of α−Al2O3 |
| Dong-Uk Choe, Byung-Ki Park1, Myung-Wan Han |
Department of Chemical Engineering, Chungnam National University
1Energy Materials Research Center, Korea Research Institute of Chemical Technology |
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| ABSTRACT |
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To precipitate the complex gels of the pH 6, 7, 8, 9 included in a flux and an aluminum hydroxides gel, an aqueous solution of a mixture of $Na_2CO_3;and;Na_2PO_4{cdot}12H_2O$ was added with stirring in an aqueous solution of a mixture of $Al_2(SO_4){_3}{cdot}18H_2O,;Na_2SO_4;and;K_2SO_4$, and then the complex gels were aged in 20 h at $90^{circ}C$. As the hydrolysis pH changed, it had an effect on the physical properties such as the crystal structure, crystal morphology and a phase transition temperature of the AlO(OH) gel, and also on the crystal structure, crystal morphology, particle size and particle size distribution of the ${alpha}-Al_2O_3$ platelets prepared by molten-salt precipitation. Also, in this study, the complex gels were crystallized at $1,200^{circ}C$ and thereafter dried at $110^{circ}C$, and then it was investigated to effect of the hydrolysis pH on the crystal structure, morphology and particle size distribution of the ${alpha}-Al_2O_3$ platelets crystals using XRD, DTA, SEM and particle size analyzer. |
| Key words:
AlO(OH), ${\alpha}-Al_2O_3$ platelets, Molten-salt, Filler, Crystal growth |
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