Crystallization kinetics of diopside glass ceramics

Abstract

The glass ceramics were prepared by a reaction crystallization and sintering method using waste glass powder and a crystallizing promoter with a main crystal phase of the enstatite. X-ray diffraction(XRD), Scanning electron microscope(SEM), Differential scanning calorimetry(DSC), etc. were used to characterize its phase composition, morphology, and thermal decomposition process. The results show that the main crystal phase of the prepared glass ceramics was diopside and the secondary crystal phase was albite. The precipitated crystals were rod-shaped with a maximum length of about 7 μm and a diameter of about 0.6 μm. Diopside glass ceramics were measured with different heating rates, and it was found that the peak temperature increased with the heating rate. The Kissinger method was used to calculate the crystallization kinetics of diopside glass ceramics, and the crystallization activation energy was 872.4 kJ⋅mol−1.