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Effect of $TiO_2$ on crystallization of silicate glass containing EAF dust  

Kim, H.S. (Materials Engineering, Kyonggni University)
Kim, W.H. (Materials Engineering, Kyonggni University)
Kim, K.D. (Materials Engineering, Kyonggni University)
Kang, S.G. (Materials Engineering, Kyonggni University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.18, no.3, 2008 , pp. 115-121 More about this Journal
Abstract
Microstructure of glass-ceramics obtained by heat treating silicate glass containing 50 wt% electric arc furnace dust (EAF dust) and nucleation agents were observed. The crystallization temperature, $T_c$ of glassy specimen measured around $850^{\circ}C$ from different thermal analysis, so the heat treatment condition to obtain glass-ceramic specimen was selected as $950^{\circ}C/15 hr$. The nucleation agent, $TiO_2$ showed the superior effect on enhancing franklinite crystal growth which has stronger mechanical properties and more durable chemical resistance than willemite phase. Some specimens containing $TiO_2$ had the augite crystal phase and increasing $TiO_2$ amount decreased a fraction of willemite and increased a franklinite. Especially, the specimen with 5 wt% $TiO_2$ showed no willemite crystal phase and $1{\sim}2\;{\mu}m$ franklinite crystals dispersed uniformly in glassy matrix. Also, the specimens containing 5 wt% $TiO_2$ mixed with $Fe_2O_3$ showed a dendrite-shaped franklinite crystals caused by coalescence of small crystallites.
Keywords
Crystallization; null; Nucleation agent; Glass-ceramics; EAF dust; Franklinite; Willemite; Dendrite;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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