Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1988-01-28
1989-12-05
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 13, 65DIG15, 65 325, 423 72, 423 76, 423492, 501 30, C03B 37027
Patent
active
048850195
ABSTRACT:
Heavy metal fluoride glasses are made by a process that requires high purity fluoride constituent compounds fluorinated oxides, or premelted glass cullet. The charge is placed in an enclosed furnace chamber having the ability of atmosphere control, heat control and position control of the charge. In particular, an inert, or nonreactive atmosphere or air is used in the furnace chamber as well as an oxygen-scavenging metal therein. The oxygen-scavenging metal at the high temperature produces a controlled oxygen partial pressure so that the air is essentially inert and non-reactive although the presence of a slightly oxidizing atmosphere is still required to produce the glass. The charge is rapidly raised to its fusion temperature and held at the temperature for a short time in proximity to an oxygen-scavenging material. The charge is immediately removed from the heating source and quickly cooled through the critical crystallization region. The total heating and cooling time being less than one hour. The HMFG or (Zr or Hf)F.sub.4 - BaF.sub.2 - LaF.sub.3 - AlF.sub.2 consistently exhibits high optical homogeneity and no absorption due to carbon dioxide along with very reproducible hardness, thermal parameters, and UV and IR edge absorption behavior.
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Collier Stanton E.
Lindsay Robert L.
Singer Donald J.
The United States of America as represented by the Secretary of
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