Method of making fluorine/boron doped silica tubes

Details Method of making fluorine/boron doped silica tubes Method of making fluorine/boron doped silica tubes

1991-12-16

1993-04-20

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65DIG16, 65110, 427163, C03B 3710, C03B 37023

Patent

active

052038980

ABSTRACT:
Disclosed is a method of forming a glass tube doped with boron and fluorine. A B.sub.2 O.sub.3 -doped tubular porous preform is heated, and a fluorine-containing gas is flowed into its aperture. The temperature is sufficiently high to cause the fluorine-containing gas to decompose and form fluorine which dopes the preform. Also flowed into the aperture is a sufficient amount of BF.sub.3 to prevent fluorine from reacting with the B.sub.2 O.sub.3 in the porous preform and forming a B.sub.2 O.sub.3 -depleted region near the aperture surface. The particles are then fused to form a fluorine-containing dense glass tube.

REFERENCES:
patent: 4165223 (1979-08-01), Powers
patent: 4620861 (1986-11-01), Berkey
patent: 4931076 (1990-05-01), Berkey
patent: 4979972 (1990-12-01), Berkey
patent: 5011251 (1991-04-01), Miller

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