Evaluation of crystallization kinetics of glasses by non-isothermal analysis

摘要: Based on Johnson-Mehl-Avrami transition equation, this paper proposes a new non-isothermal method for evaluating the crystallization kinetics of glasses. An equation relating kinetic parameters activation energy, E, and frequency factor, v, to inflection-point temperature, Tf, heating rate, β, differential thermal analysis (DTA) experiment is established. The can be easily determined from derivative (DDTA) curves. validity proposed ascertained by applying it Li2O·2SiO2 glass. acquired values are excellent agreement with isothermal results. In contrast, traditional methods give much higher values.