Kinetic study on lithium-aluminosilicate (LAS) glass-ceramics containing MgO and ZnO
2014; Elsevier BV; Volume: 40; Issue: 8 Linguagem: Inglês
10.1016/j.ceramint.2014.03.171
ISSN1873-3956
AutoresLola Lilensten, Qiang Fu, Bryan R. Wheaton, Allen J. Credle, R. L. Stewart, Jeffrey T. Kohli,
Tópico(s)Clay minerals and soil interactions
ResumoMagnesium oxide and zinc oxide are widely used to reduce batch cost and increase the working range for the production of commercial Li2O–Al2O3–SiO2 (lithium aluminosilicate), LAS, glass-ceramics. However, little work is done on the crystallization kinetics of the glass-ceramic containing MgO and ZnO. In this work, an investigation was conducted to study the crystallization kinetics using non-isothermal and isothermal methods by differential scanning calorimetry (DSC) and high temperature X-ray diffraction (HTXRD), respectively. Both non-isothermal and isothermal methods confirm a bulk crystallization mechanism in the glass-ceramic. Activation energy values of 373 and 442 kJ/mol were determined using a modified Kissinger model and the Johnson–Mehl–Avrami–Kohnogorov (JMAK) model, respectively.
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