Hot-pressed fluoride glasses

Details Hot-pressed fluoride glasses Hot-pressed fluoride glasses

1981-05-28

1983-06-14

Bell, Mark

Glass manufacturing

Processes

Sequentially forming, reheating, and working

65102, 501 40, C03B 2320, C03C 318

Patent

active

043880975

ABSTRACT:
Hot pressing of fluoride glasses is provided. These glasses are synthesized from ZrF.sub.4 -BaF.sub.2 and HfF.sub.4 -BaF.sub.2 systems. Hot pressing rough blanks in a closed die made of hard, polished, optically-figured material, such as cobalt-bonded tungsten carbide, is done by pressing the glasses at a temperature between that of the softening point of the glass and its crystallization temperature and at a pressure sufficient to cause flow of the glass at the pressing temperature. As a consequence, mechanical polishing steps on all glass surfaces is eliminated, thereby minimizing surface contamination.

REFERENCES:
patent: 3900328 (1975-08-01), Parsons et al.
patent: 4046545 (1977-09-01), Sanford et al.
patent: 4101331 (1978-07-01), Anderson
patent: 4141741 (1979-02-01), Lucas et al.

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