Abstract
Available sites for nucleation has to reach saturated condition that is a primary validity criterion for employing conventional thermo-analytical (TA) methods. Non-isothermal DSC and TA methods were employed to determine the crystallisation parameters of site-saturated lithium aluminosilicate (LAS) glass. Activation energy of crystallisation for a thermally stable LAS composition was determined after prenucleation process and it was found to be 371 ± 14 kJ/mol. A heat treatment programme for controlled crystallisation process was designed to result a transparent (>80%), nanocrystalline, low expansion (coefficient of thermal expansion −0.31 ppm/K between −60 to +60 °C) glass-ceramic. Crystal growth at 1048 K was determined to be in range 2.56–3.53 × 10−11 m/s and viscosity of glass near the growth front was predicted to vary between 1.28 × 105 and 2.82 × 105 N s m−2.
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