Glass manufacturing – Processes – Operating under inert or reducing conditions
Patent
1990-03-06
1991-05-14
Schor, Kenneth M.
Glass manufacturing
Processes
Operating under inert or reducing conditions
501 40, 65134, 65DIG16, C03B 3700
Patent
active
050152815
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 pre-treatment 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 and SnF.sub.4. Previous method 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.
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Andrews Leonard J.
Folweiler Robert C.
Hall Bruce T.
Bruckner John J.
Craig Frances P.
GTE Laboratories Incorporated
Schor Kenneth M.
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