Non-isothermal crystallization kinetic studies on MgO–Al2O3–SiO2–TiO2 glass |
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| Institution: | 1. Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal;2. Physics Department, Faculty of Science, Al-Azhar University, Assuit 71542, Egypt;3. Centro Técnico Aeroespacial, Instituto de Aeronáutica do Espaço, Divisão de Materiais, S. José dos Campos – SP, Brazil;4. UIDM, ESTG, Polytechnic Institute of Viana do Castelo, 4900 Viana do Castelo, Portugal |
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| 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 °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 850–1000 °C. The influence of the addition of TiO2 on the crystallization sequence of the glass was experimentally determined and discussed. |
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