ACTIVATION-ENERGY FOR CRYSTAL-GROWTH USING ISOTHERMAL AND CONTINUOUS HEATING PROCESSES

The kinetics of crystallization of plasma-sprayed amorphous cordierite and forsterite have been studied using both the isothermal Johnson-Mehl-Avrami and the continuous-heating Kissinger approaches. The activation energies for crystal growth obtained from the two processes are essentially equivalent: 1600±400 and 1600±300 kJ mol-1 for cordierite and 340±88 and 410±45 kJ mol-1 for forsterite, using isothermal and continuous heating, respectively. A correlation between the isothermal and non-isothermal crystallization processes is established. © 1990 Chapman and Hall Ltd.