Abstract
The purpose of this paper was to investigate the crystallization process of glass ceramics prepared from a mixture which was composed of nickel slag, blast furnace slag and a small amount of quartz sand. First, the parent glass of the mixture was prepared. Then, the glass ceramics were obtained by heat-treating for the parent glass. The crystallization behavior was studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). A large number of tiny spherical crystals were observed when the glass was heated up to 700 °C. Subsequently, the radial crystals were observed when the glass was heated up to 820 °C. By XRD analyzing, the spherical crystals and radial crystals were likely to be the crystals of diopside (CaMg(Si,Al,Fe) 2O 6) and hedenbergite (CaFe(Si,Al,Fe) 2O 6). The crystallization temperature was 860 °C and the final crystalline phases were identified to be diopside and hedenbergite. In addition, the activation energy of crystallization was evaluated by Kissinger method.
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