Investigation of Glass-Ceramics Based on Steel Slag under Various Sintering Atmospheres
Slag glass-ceramics were successfully prepared by cold pressing sintering method in different atmospheres from metallurgical solid wastes. The evolution of crystal microstructure and crystalline phase transition of slag glass-ceramics was investigated by thermo-gravimetric analysis (TG-DTA), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) coupled with Energy Dispersive X-ray spectrometer (EDX). The results indicate that the Na2O composition plays the role of decreasing the crystallization temperature to some extent. Iron oxides make the glass frits have a high driving force to crystallize. This oxidation of ferrum will postpone the process of densification and deteriorate the mechanical properties of product. On the other hand, the slag glass-ceramic products can obtain novel mechanical performance when the samples were sintered under nitrogen atmosphere.