Abstract
Blast furnace slag containing CaO, MgO, Al2O3 and SiO2 as major components was used as the raw material for β-spodumene glass-ceramics. The batch compositions were modified by mixing blast furnace slag with SiO2, Al2O3, Li2CO3 and nucleating agent TiO2. The crystallization processes of the glasses based on the blast furnace slag were investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and electron diffraction (ED). It was found that the major crystalline phase was β-spodumene (Li2O⋅Al2O3⋅4SiO2) and the average thermal expansion coefficients between 25° and 700°C were 40.1 and 47.2×10-7°C-1 for two different samples.
