Effect of glass cooling rate on the crystallization behavior and structure of Al2O3-SiO2-Na2O-CaF2 oxyfluoride glass-ceramics
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The glass cooling rate during molding process has significant effect on the crystallization behavior and structural uniformityof Al2O3-SiO2-Na2O-CaF2 oxyfluoride glass-ceramics. Abaqus Finite Element Analysis indicated that at room temperaturecooling environment, the cooling rate of 8mm thick glass was notably lower than that of 3 mm thick glass. The interiortemperature of 8 mm thick precursor glass was still above 710 oC even after the sample was cooled for 15 s, which caused theformation of “crystal stones” in precursor glass. The microstructure of oxyfluoride glass and glass-ceramics with differentthickness was analyzed by using DTA, XRD, IR and SEM. Since the 8 mm thick glass was cooled slowly, the initial crystalnucleation generated in the interior of glass, mixed crystal phases were formed in the interior after heat treatment, while singleCaF2 crystal phase formed on the surface. On the contrary, there was only uniform CaF2 crystal phase generating in the 3mm thick precursor glass after heat treatment, as a result of high cooling rate during molding process. Besides, the mechanismand ways to optimize the structure uniformity of glass ceramics were also be discussed.
Abstract
The glass cooling rate during molding process has significant effect on the crystallization behavior and structural uniformityof Al2O3-SiO2-Na2O-CaF2 oxyfluoride glass-ceramics. Abaqus Finite Element Analysis indicated that at room temperaturecooling environment, the cooling rate of 8mm thick glass was notably lower than that of 3 mm thick glass. The interiortemperature of 8 mm thick precursor glass was still above 710 oC even after the sample was cooled for 15 s, which caused theformation of “crystal stones” in precursor glass. The microstructure of oxyfluoride glass and glass-ceramics with differentthickness was analyzed by using DTA, XRD, IR and SEM. Since the 8 mm thick glass was cooled slowly, the initial crystalnucleation generated in the interior of glass, mixed crystal phases were formed in the interior after heat treatment, while singleCaF2 crystal phase formed on the surface. On the contrary, there was only uniform CaF2 crystal phase generating in the 3mm thick precursor glass after heat treatment, as a result of high cooling rate during molding process. Besides, the mechanismand ways to optimize the structure uniformity of glass ceramics were also be discussed.
참고문헌 (13)
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