Effect of Rutile/Anatase TiO2 on surface properties of ZnO-Al2O3-CaO-SiO2 glass system
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In this study, we investigated the effects of dimorphous nucleating agentsrutile TiO2 and anatase TiO2, on the crystallizationand surface properties of ZnO-Al2O3-CaO-SiO2-based glass. Glass specimens were prepared by substituting rutile TiO2 andanatase TiO2 at 1, 3, and 5 wt.% and subsequently heat treating at 1050 °C for 90 min to induce crystallization. Thecrystallization characteristics and surface properties of the crystallized glass were analyzed using X-ray diffraction (XRD),scanning electron microscopy (SEM), gloss, Fourier-transform infrared (FTIR) spectroscopy, hardness, and colorimetricanalyses. The XRD and SEM analyses revealed the presence of a titanite crystalline phase in the glass matrix. However, theaddition of anatase TiO2 as a nucleating agent resulted in a significant decrease in glossiness. FTIR deconvolution in the rangeof 800-1300 cm−1 showed an increase in the degree of [SiO4] tetrahedral polymerization with higher levels of crystallization. micro-Vickers hardness of the glass specimens increased from the original value of 6.32 GPa to a maximum of 7.05 GPa,indicating enhanced hardness due to crystallization. Colorimetric analysis indicated that the inclusion of rutile TiO2 as anucleating agent increased the Yellow Index of anatase TiO2.
Abstract
In this study, we investigated the effects of dimorphous nucleating agentsrutile TiO2 and anatase TiO2, on the crystallizationand surface properties of ZnO-Al2O3-CaO-SiO2-based glass. Glass specimens were prepared by substituting rutile TiO2 andanatase TiO2 at 1, 3, and 5 wt.% and subsequently heat treating at 1050 °C for 90 min to induce crystallization. Thecrystallization characteristics and surface properties of the crystallized glass were analyzed using X-ray diffraction (XRD),scanning electron microscopy (SEM), gloss, Fourier-transform infrared (FTIR) spectroscopy, hardness, and colorimetricanalyses. The XRD and SEM analyses revealed the presence of a titanite crystalline phase in the glass matrix. However, theaddition of anatase TiO2 as a nucleating agent resulted in a significant decrease in glossiness. FTIR deconvolution in the rangeof 800-1300 cm−1 showed an increase in the degree of [SiO4] tetrahedral polymerization with higher levels of crystallization. micro-Vickers hardness of the glass specimens increased from the original value of 6.32 GPa to a maximum of 7.05 GPa,indicating enhanced hardness due to crystallization. Colorimetric analysis indicated that the inclusion of rutile TiO2 as anucleating agent increased the Yellow Index of anatase TiO2.
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