Glass ceramics were prepared from fly ash, waste window glass and fluorite raw materials. Mixtures of raw materials were melted at 1300, 1400 and 1500°C for 4 h and quenched in cold water. The crystallization behavior of glass ceramics was investigated by differential thermal analysis-thermogravimetry (DTA-TG). Crystallization at various temperatures (700, 800, 900 and 1000°C) for 30 min was used to obtain the glass ceramics. The obtained glass ceramics were characterized by X-ray diffraction (XRD), light microscopy and hardness test. XRD study revealed that the crystallized phases were plagioclase-type minerals (diopside and albite). The Vickers hardness of the glass ceramics increased from 0.80±0.19 GPa to 6.35±0.35GPa and density ranged from 1.44 g/cm~3 to 2.42 g/cm~3 depending on the treatment temperature. Glass ceramics prepared from fused glass melted at 1500°C temperature showed the highest hardness compared with those melted at lower temperatures.
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