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Abstract
The influence of iron content and oxidation state on the crystallization and microstructure of steel slag based glass-ceramics was investigated in the CaO-Al2O3-SiO2-MgO-FeOx system. The crystallization mechanism of parent glass and microstructure of final products were studied by thermogravimetry and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The results indicate that part of Fe3+ appeared as six-coordinated [FeO6] octahedron and acted as network modifier with more ferrous or metallic irons being further oxidized to ferric irons. The crystalline temperatures of glass samples shifted to higher values as the iron content became lower supported by the result of crystallization activation energy. The crystal morphology of low iron content samples appeared mainly in the form of cluster or column and limited amount of granule, while sample with high iron content was principally composed of granular crystals.