Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Effect of $TiO_2$ on crystallization of silicate glass containing EAF dust

전기로 제강 더스트가 포함된 규산염계 유리의 결정화에 미치는 $TiO_2$ 영향

  • 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)
  • 김환식 (경기대학교 첨단산업공학부 신소재공학) ;
  • 김우형 (경기대학교 첨단산업공학부 신소재공학) ;
  • 김강덕 (경기대학교 첨단산업공학부 신소재공학) ;
  • 강승구 (경기대학교 첨단산업공학부 신소재공학)
  • Published : 2008.06.30
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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.

제강분진(EAF dust, 이하 더스트) 50wt%와 핵 형성제를 함유한 규산염계 유리 시편을 열처리하여 결정화 시킨 후 미세구조를 관찰하였다. 제조된 유리의 DTA 분석결과 결정화온도($T_c$)는 $850^{\circ}C$ 부근이었으며 이로부터 열처리 조건을 $950^{\circ}C$/15 hr로 정하였다. 핵 형성제 $TiO_2$는 $Fe_2O_3$나 $Cr_2O_3$에 비해 기계적 특성 및 화학적 내구성이 willemite 결정보다 우수한 franklinite 결정상의 성장을 시키는 효과가 탁월하였다. $TiO_2$가 첨가된 일부 결정화 유리 시편에서 augite 결정상이 관찰되었으며, 첨가량이 증가할수록 willemite 결정상은 줄어들고 franklinite 결정상은 증가하였다. 특히 5wt% 첨가된 시편은 willemite 결정상이 나타나지 않았으며 $1{\sim}2\;{\mu}m$ 크기의 franklinite 결정상이 유리 모상내에 고르게 분포되어 있었다. 또한 $TiO_2$가 5wt% 첨가된 시편에 $Fe_2O_3$를 첨가하면 franklinite 결정상들이 더욱 성장하여 서로 합체됨으로서 수지상 모양의 결정상을 나타내었다.

Keywords

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