The crystallization kinetics of the Bi2O3-added MgO–Al2O3–SiO2–TiO2 glass ceramics system produced from industrial waste
In this study, the influence of Bi2O3 on the crystallization kinetics of the MgO–Al2O3–SiO2–TiO2 glass ceramics system produced from industrial waste was investigated. The Bi2O3-added MgO–Al2O3–SiO2–TiO2 glass ceramics systems were prepared by melting method. The crystallization behaviour and crystallization kinetics of a sample with glass ceramic composition were examined. DTA and XRD analysis revealed the crystallization of Ca0.965Mg2Al16O27 cordierite (Mg2Al4Si5O18) and Fe2TiO5 phases. The activation energy for the crystallization of cordierite phase has been evaluated, and the crystallization mechanism has been studied by applying DTA measurements taken at various heating rates. The results indicate that the dominant crystallization mechanism for this system is bulk crystallization dominated by three-dimensional growth. At 2.5, 5 and 10% Bi2O3 addition, the crystallization activation energy was calculated to be 336 ± 4, 218 ± 1 and 170 ± 3 kJ mol−1, and the viscous flow activation energy was measured to be 377 ± 2, 403 ± 7 and 407 ± 21 kJ mol−1, respectively.
KeywordsMAST glass–ceramics Bi2O3 Crystallization kinetics Industrial waste
This work was supported by Commission for Scientific Research Projects (BAPK) in Sakarya University (Project number: 2016-01-08-030).