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A PROCESS FOR PREPARATION OF IRON-DOPED ALUMINO-PHOSPHATE GLASS USING MICROWAVE ENERGY IN AIR ATMOSPHERE FOR HEAT ABSORBING APPLICATION
A PROCESS FOR PREPARATION OF IRON-DOPED ALUMINO-PHOSPHATE GLASS USING MICROWAVE ENERGY IN AIR ATMOSPHERE FOR HEAT ABSORBING APPLICATION
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机译：微波吸收空气中微波能量制备铁掺杂磷酸铝玻璃的工艺
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摘要
Heat absorbing property of glass is obtained by incorporating ferrous oxidation state of iron in the glass system. Ferrous oxidation state is having absorption at 1000-1200 nm wavelength in glass. To retain ferrous oxidation state, iron doped glass is usually melted in reducing atmosphere in conventional furnace using reducing agent such as Sn in the composition. The iron-doped alumino-phosphate glass with the range of composition in wt.% (P2O5 - 70-77, A1203 - 10-15, B203 -1-5, MgO -2-5, ZnO - 2-6) with the addition of metal powder Fe -2-3, Sn 0.25-1, Al 0-1, as dopant, was prepared by melt quenching technique in microwave furnace. Glass composition was optimized in order to get percentage optical transmission as less than 0.10 of 3 mm thick glass at 1050 nm. In microwave furnace glasses have been melted in air and % transmission at 1050 nm was compared with the glass melted in nitrogen and in reducing atmosphere; Optical transmission at near IR (1050 nm) range was found less than 0.1 % and visible % (at 550 nm ) was LIP to 83 % in the glasses melted in air atmospheres. Thus, microwave heating offers an easy and useful method to melt IR absorbing glass.
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