Preparation of Pb-based glass powders by spray pyrolysis using a filter expansion aerosol generator
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PbO-B2O3-SiO2 glass powders were directly prepared by a filter expansion aerosol generator (FEAG) process. Glass powders were formed by melting and cooling processes of the powders inside the hot wall reactor which was maintained at a low pressure. The powders prepared at temperatures below 800oC had a spherical shape and submicrometre size. One glass powder was formed from one droplet at preparation temperatures below 800oC. On the other hand, the powders prepared at a temperature of 900oC had a bimodal size distribution with nanometre and submicrometre size. The mean size of the glass powders prepared by the FEAG process at a temperature of 800oC was 320 nm. In the DSC curve, the glass transition temperature (Tg) of the glass powders was 411.5oC. The transparencies of the dielectric layers formed from the glass powders obtained by the FEAG process were higher than 90% within the visible light range at annealing temperatures above 500oC.
Abstract
PbO-B2O3-SiO2 glass powders were directly prepared by a filter expansion aerosol generator (FEAG) process. Glass powders were formed by melting and cooling processes of the powders inside the hot wall reactor which was maintained at a low pressure. The powders prepared at temperatures below 800oC had a spherical shape and submicrometre size. One glass powder was formed from one droplet at preparation temperatures below 800oC. On the other hand, the powders prepared at a temperature of 900oC had a bimodal size distribution with nanometre and submicrometre size. The mean size of the glass powders prepared by the FEAG process at a temperature of 800oC was 320 nm. In the DSC curve, the glass transition temperature (Tg) of the glass powders was 411.5oC. The transparencies of the dielectric layers formed from the glass powders obtained by the FEAG process were higher than 90% within the visible light range at annealing temperatures above 500oC.