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

C - Chemistry, Metallurgy

03

B

C03B 37/018 (2006.01) C03B 37/014 (2006.01) C03B 37/028 (2006.01) G02B 6/24 (2006.01) G02B 6/28 (2006.01)

Patent

CA 2083528

Abstract of the Disclosure Disclosed is a method of forming a glass tube doped with boron and fluorine. A B2O3-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 BF3 to prevent fluorine from reacting with the B2O3 in the porous preform and forming a B2O3-depleted region near the aperture surface. The particles are then fused to form a fluorine-containing dense glass tube.

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