Method of manufacturing stria-free, bubble-free and homogeneous

Details Method of manufacturing stria-free, bubble-free and homogeneous Method of manufacturing stria-free, bubble-free and homogeneous

1985-04-23

1986-09-16

Schor, Kenneth M.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 85, 65 90, 65DIG4, 65DIG8, 373 27, C03B 1902, C03B 502

Patent

active

046120238

ABSTRACT:
A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a starting material. The cylinder is continuously lowered into a furnace shell flooded with an inert gas, in which it is heated to a flowing temperature in the range of 1700.degree. to 1900.degree. C. until some of the quartz-glass flows off into a graphite crucible. The crucible is preferably clad with zirconium-oxide.

REFERENCES:
patent: 1603221 (1926-10-01), Thomson
patent: 2726487 (1955-12-01), Cummins et al.
patent: 2924046 (1960-02-01), Cummins
patent: 3696223 (1972-10-01), Metcalf et al.
patent: 3717450 (1973-02-01), Loughridge
patent: 3838729 (1974-10-01), Daigne et al.
patent: 4193782 (1980-03-01), Aulich et al.
patent: 4419177 (1983-12-01), Pryor et al.

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