Preparation and Crystallization Behavior of Na_2O-CaO-SiO_2-MgO-Al_2O_3-ZnO Glass-ceramics

The glass-ceramics was prepared from the phosphorus slag as main primary raw materials by melt quenching technique.The optimal heat-treatment schedule of glass-ceramics was determined,and the effects of Na2O on crystallization behavior of glass-ceramics were investigated by X-ray powder diffraction analysis and scanning electron microscopy.It was shown that the glass-ceramics were obtained by nucleation at 750 ℃ for 4 h and crystallization at 850 ℃ for 2 h,which the main crystalline phases are wollastonite and combeite.Na2O promotes volume crystallization and the precipitation of combeite.