Reactive atmosphere processing of heavy-metal fluoride glasses

Glass manufacturing – Processes – Forming product or preform from molten glass


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65 301, 65134, 65DIG16, 501 37, 501 40, 501904, C03C 312




Process for treating molten mixtures of fluorozirconate glass to form high purity infrared transparent glass which is essentially free of zirconium fluoride disassociation impurities and anion impurities. The molten mixture or melt is treated with a moisture-free oxygen reactive atmosphere to prevent formation of disassociation impurities or to remove any of these impurities already present in the melt. The melt is also contacted simultaneously or subsequently with a fluorine species reactive gas to remove any oxygen anion impurities formed during the oxygen reactive atmosphere treatment of the melt to thereby provide a glass having complete fluorine stoichiometry and which is free of disassociation and anion impurities.

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patent: 4343638 (1982-08-01), Mitachi et al.
patent: 4539032 (1985-09-01), Tran et al.


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