Method for preparing fluoride glasses

Details Method for preparing fluoride glasses Method for preparing fluoride glasses

1989-05-04

1990-08-07

Schor, Kenneth M.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65134, 65DIG16, 501 40, C03B 5225, C03B 5235, C03C 332

Patent

active

049464906

ABSTRACT:
A new, simplified method of fabricating optically transparent fluoride glasses containing ZrF.sub.4 and/or HfF.sub.4 has been developed which relies on a high vacuum pretreatment for surface dehydration, melting in a rigorously inert argon atmosphere, and incorporation of a nonvolatile metallic oxidant in the melt such as InF.sub.3 or SnF.sub.4. Previous methods for making these glasses have relied on either addition of ammonium bifluoride into the batch materials, or melting in an oxidizing atmosphere (so-called reactive atmosphere processing or RAP); both of these latter techniques have significant drawbacks.

REFERENCES:
patent: 4647545 (1987-03-01), Lucas
patent: 4666870 (1987-05-01), Poulain

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