Crystallization kinetics and process of the glass-ceramic produced by nickel slag

The glass-ceramic was produced by nickel slag as primary raw material. The crystallization process of the glass-ceramic was analyzed and the crystallization temperature was determined by DSC. The activation E and crystallization kinetic parameter k (T_p) of the glass added 2% Cr₂O₃ by weight as nucleation agent were calculated by the modified Johnson-Mehl-Avrami (JMA) method, and the results were 371. 1 kJ· mol^-1 and 0.29, respectively. The characters of crystals appearing in glass were analyzed by XRD, SEM and optical microscope observation methods. It is shown that the crystallization process is observed between 930℃ and 950℃, and the size of crystals is 10~15μm after heat treatment at 950℃ for 30 min.