Method for the production of flat, transparent vitreous silica s

Details Method for the production of flat, transparent vitreous silica s Method for the production of flat, transparent vitreous silica s

1981-04-16

1983-03-22

Fisher, Richard V.

Glass manufacturing

Processes

Fining or homogenizing molten glass

264 64, C03B 5225, C03B 5235, C03B 542, C03B 2000

Patent

active

043774059

ABSTRACT:
Flat, transparent slabs of vitreous silica of optical quality are produced by melting granular starting material in a vacuum by means of an electrical heating system. The starting material is melted while sustaining a heat flow from the top to the bottom of the crucible. The bottom of the crucible is made permeable to gases. The heat isolation power of the crucible wall increases from the bottom to the top of the crucible.

REFERENCES:
patent: 1537036 (1925-05-01), Miller
patent: 1862358 (1932-06-01), Devers
patent: 1936476 (1933-01-01), George
patent: 2726487 (1955-12-01), Cummins et al.
patent: 3205292 (1965-09-01), Descarsin

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