Characteristics of ZnO-B2O3-SiO2 glass powders prepared by spray pyrolysis as densification promoter for BaTiO3 ceramics
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Spherical shape ZnO-B2O3-SiO2 glass powders were prepared by spray pyrolysis. The optimum preparation temperature is 1500 oC when the flow rate of the carrier gas is 5 Lminute-1. The mean size and geometric standard deviation of the glass powders is 0.78 μm and 1.38. The glass transition temperature of the glass powders is 489.1 oC. Melting of the ZnO-B2O3-SiO2glass powders occurs at 500 oC. On the other hand, some of the glass powders maintain a spherical morphology after firing at 500 oC. Complete melting of the glass powders occurs at firing temperatures of 600 and 700 oC, in which crystalline structures are observed. The dielectric constant of the BaTiO3 pellet with 3 wt.% ZnO-B2O3-SiO2 glass is 2682 at a firing temperature of 1000 oC.
Abstract
Spherical shape ZnO-B2O3-SiO2 glass powders were prepared by spray pyrolysis. The optimum preparation temperature is 1500 oC when the flow rate of the carrier gas is 5 Lminute-1. The mean size and geometric standard deviation of the glass powders is 0.78 μm and 1.38. The glass transition temperature of the glass powders is 489.1 oC. Melting of the ZnO-B2O3-SiO2glass powders occurs at 500 oC. On the other hand, some of the glass powders maintain a spherical morphology after firing at 500 oC. Complete melting of the glass powders occurs at firing temperatures of 600 and 700 oC, in which crystalline structures are observed. The dielectric constant of the BaTiO3 pellet with 3 wt.% ZnO-B2O3-SiO2 glass is 2682 at a firing temperature of 1000 oC.
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