In-situ quenched fluoride glasses

Details In-situ quenched fluoride glasses In-situ quenched fluoride glasses

1990-01-22

1991-09-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 325, 65 66, 65 83, 501904, 501906, C03C 332

Patent

active

050455079

ABSTRACT:
A process for producing high quality optical glass from fluoride glasses comprising preparing a melt of the glass and then cooling the melt in-situ inside the melt crucible. The in-situ quenching technique can be improved by narrowing the temperature range between the liquidus temperature and the glass transition temperature of the glass. The stability of the fluoride glass can be increased and the liquidus temperature of the glass can be lowered by doping the glass with a chloride dopant. Thorium tetrafluoride can be added to the chloride-doped glass in order to increase the chemical stability of the glass.

REFERENCES:
patent: 4666870 (1987-05-01), Poulain et al.
patent: 4845057 (1989-07-01), Miura et al.
patent: 4885012 (1989-12-01), Hutta

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