Fabrication of optical preforms by axial chemical vapor depositi

Details Fabrication of optical preforms by axial chemical vapor depositi Fabrication of optical preforms by axial chemical vapor depositi

1982-06-14

1984-04-03

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 13, 65 182, 65 32, 65157, C03B 1906, C03B 37025

Patent

active

044405588

ABSTRACT:
Hydroxyl free deposition with high efficiency and at a high deposition rate may be achieved, even with use of relatively inexpensive raw materials, by utilizing a ring-shaped plasma activated axial chemical vapor deposition obtaining 100% chemical conversion and fractional volatilization of impurities. The plasma is induced in an annular stream of a plasma-forming gaseous medium, and the reactant or reactants used in the axial chemical vapor deposition are introduced into the center of the ring-shaped plasma to be converted by the heat of the plasma flame into soot which is deposited on a bait. An annular stream of a cooling medium flows outwardly past the plasma flame and is circumferentially centered by an extension of the outer tubular element of a plasma torch in which the plasma is generated. An RF generator which induces the plasma is operated at a frequency exceeding 20 MHz to give the plasma flame the desired ring-sloped configuration.

REFERENCES:
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patent: 3957474 (1976-05-01), Kobayashi et al.
patent: 3966446 (1976-06-01), Miller
patent: 4017288 (1977-04-01), French et al.
patent: 4062665 (1977-12-01), Izawa et al.
patent: 4135901 (1979-01-01), Fujiwara et al.
patent: 4224046 (1980-09-01), Izawa et al.
patent: 4225330 (1980-09-01), Kakuzen et al.
patent: 4230472 (1980-10-01), Schultz
patent: 4242118 (1980-12-01), Irven

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