Abstract
For the investigation of the crystallization behavior of the glass with the composition 2MgO–2Al 2O 3–5SiO 2, corresponding to stoichiometric cordierite, according to the addition of CeO 2 as a flux, the maximum nucleation and crystal growth rates were determined by observing the microstructure of the crystallized glass with scanning electron microscopy (SEM). The crystallization mechanism was also studied by an isothermal method using differential thermal analysis (DTA). The glass transition temperature ( T g) decreased with the CeO 2 addition and only α-cordierite was precipitated as a main crystal phase without μ-cordierite for all heat treated glasses containing CeO 2. The maximum nucleation and crystal growth rates were 2.4 μm −3 h −1 at 800°C and 0.3 μm h −1 at 915°C, respectively. The activation energy value E obtained from isothermal method was 88.9±9.1 kcal mol −1 , and the Avrami constant n was 1.08±0.27, which indicates a surface growth mechanism through an interface reaction.
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