Non-isothermal crystallization kinetic studies on MgO-Al2O3-SiO2-TiO2 glass

abstract

Thermal stability and crystallization kinetics of the glass 21% MgO, 21.36% Al2O3, 53.32% SiO2 and 4.11% TiO2 (mol%) has been studied using differential thermal analysis (DTA), dilatometry and X-ray diffraction (XRD). Glass in both bulk and frit forms were produced by melting in platinum crucible at 1600 degrees C for 1-2 h. From variation of DTA peak maximum temperature with heating rate, the activation energies of crystallization were calculated to be 340 kJ mol(-1) and 498 kJ mol(-1) for first and second crystallization exotherms, respectively. Crystallization of bulk glass was carried out at various temperatures and for different time durations in the range of 8501000 degrees C. The influence of the addition of TiO2 On the crystallization sequence of the glass was experimentally determined and discussed. (C) 2007 Published by Elsevier B.V.

keywords

SB-SE GLASSES; CERAMICS; CORDIERITE; MICA; MACHINABILITY; DSC

subject category

Materials Science

authors

Goel, A; Shaaban, ER; Melo, FCL; Ribeiro, MJ; Ferreira, JMF

our authors

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