Effect of TiO₂on crystallization of silicate glass containing EAF dust
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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, Tc of glassy specimen measured around 850℃ from different thermal analysis, so the heat treatment condition to obtain glass-ceramic specimen was selected as 950℃/15 hr. The nucleation agent, TiO₂showed the superior effect on enhancing franklinite crystal growth which has stronger mechanical properties and more durable chemical resistance than willemite phase. Some specimens containing TiO₂had the augite crystal phase and increasing TiO₂ amount decreased a fraction of willemite and increased a franklinite. Especially, the specimen with 5 wt% TiO2 showed no willemite crystal phase and 1~2 μm franklinite crystals dispersed uniformly in glassy matrix. Also, the specimens containing 5 wt% TiO2 mixed with Fe₂O₃ showed a dendrite-shaped franklinite crystals caused by coalescence of small crystallites.
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, Tc of glassy specimen measured around 850℃ from different thermal analysis, so the heat treatment condition to obtain glass-ceramic specimen was selected as 950℃/15 hr. The nucleation agent, TiO₂showed the superior effect on enhancing franklinite crystal growth which has stronger mechanical properties and more durable chemical resistance than willemite phase. Some specimens containing TiO₂had the augite crystal phase and increasing TiO₂ amount decreased a fraction of willemite and increased a franklinite. Especially, the specimen with 5 wt% TiO2 showed no willemite crystal phase and 1~2 μm franklinite crystals dispersed uniformly in glassy matrix. Also, the specimens containing 5 wt% TiO2 mixed with Fe₂O₃ showed a dendrite-shaped franklinite crystals caused by coalescence of small crystallites.
참고문헌 (16)
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