Effect of TiO2 on the crystallization behaviors and microstructure of glazes based on MgO-Al2O3-SiO2 system
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A MgO-Al2O3-SiO2 system was used in order to prepare glass-ceramic glazes with high-hardness applicable to ceramic tiles. The glass-ceramic glazes were prepared by adding the fluxes CaO and B2O3 and the nucleating agent TiO2 to the glaze. The crystallization behavior of the glaze was calculated by a non-isothermal thermal analysis via a Differential Thermal Analysis (DTA), and the glaze was heat treated at the crystallization temperature (Tp2). The activation energy (E) and the Avrami constant (n) of the glaze with 8wt% TiO2 substitution were 177.07 kJ/mol and 2.65, respectively. X-ray diffraction analysis (XRD) showed that the cordierite and anorthite crystal phases were formed and the karrooite crystal phases grew with increasing TiO2 substitution. The degree of crystallinity increased as the amount of TiO2 increased and the degree of crystallinity was 76.5% in the glaze with 8 wt% TiO2 substitution. In the Scanning Electron Microscope (SEM) analysis, the cordierite and anorthite crystal phases were the largest in the glaze with 8wt% TiO2 substitution and rapidly decreased in the glaze with 12 wt% TiO2 substitution. As a result, Vickers hardness of the glaze showed a high value of 7.10 GPa at the glaze with 8wt% TiO2 substitution after heat treatment at 1,010 oC.
Abstract
A MgO-Al2O3-SiO2 system was used in order to prepare glass-ceramic glazes with high-hardness applicable to ceramic tiles. The glass-ceramic glazes were prepared by adding the fluxes CaO and B2O3 and the nucleating agent TiO2 to the glaze. The crystallization behavior of the glaze was calculated by a non-isothermal thermal analysis via a Differential Thermal Analysis (DTA), and the glaze was heat treated at the crystallization temperature (Tp2). The activation energy (E) and the Avrami constant (n) of the glaze with 8wt% TiO2 substitution were 177.07 kJ/mol and 2.65, respectively. X-ray diffraction analysis (XRD) showed that the cordierite and anorthite crystal phases were formed and the karrooite crystal phases grew with increasing TiO2 substitution. The degree of crystallinity increased as the amount of TiO2 increased and the degree of crystallinity was 76.5% in the glaze with 8 wt% TiO2 substitution. In the Scanning Electron Microscope (SEM) analysis, the cordierite and anorthite crystal phases were the largest in the glaze with 8wt% TiO2 substitution and rapidly decreased in the glaze with 12 wt% TiO2 substitution. As a result, Vickers hardness of the glaze showed a high value of 7.10 GPa at the glaze with 8wt% TiO2 substitution after heat treatment at 1,010 oC.
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