Back to results
US 5,154,744 AGranted
Method of making titania-doped fused silica
AssigneeCorning Incorporated
InventorsJeffery L. Blackwell, Carlton M. Truesdale
Life of this patent
Estimating the term…
Abstract
This invention relates to production of high purity fused silica glass doped with titania through oxidation or flame hydrolysis of a gaseous mixture and containing rutile crystals comprising a vaporizable, silicon-containing compound. Titanium-2-ethylhexyloxide, titanium cyclopentyloxide, and a titanium amide, or a combination thereof, constitute the operable titanium-containing compounds.
Claims15
In a method for making a non-porous body of high purity fused silica glass doped with titania comprising the steps of:
- (a) producing a gas stream containing a silicon-containing compound in vapor form capable of being converted through thermal decomposition with oxidation or flame hydrolysis to SiO.sub.2 and a titanium-containing compound in vapor form capable of being converted through thermal decomposition with oxidation or flame hydrolysis to TiO.sub.2;
- (b) passing said gas stream into the flame of a combustion burner to form amorphous particles of fused SiO.sub.2 doped with TiO.sub.2 and containing submicroscopic crystals of rutile and anatase with rutile being the predominant crystal phase;
- (c) depositing said amorphous particles onto a support;
- and
- (d) either essentially simultaneously with said deposition or subsequently thereto consolidating said deposit of amorphous particles into a non-porous body;
- the improvement comprising utilizing as said titanium-containing compound in vapor form a halide-free, titanium-containing compound selected from the group consisting of titanium-2-ethylhexyloxide, titanium cyclopentyloxide, and a titanium amide, or a combination thereof, whereby no halide-containing vapors are emitted from said titanium-containing compound during the making of said porous body.
3 more elements
In a method for making optical waveguide fibers of high purity fused silica glass doped with titania comprising the steps of:
- (a) producing a gas stream containing a silicon-containing compound in vapor form capable of being converted through heat treatment with oxidation or flame hydrolysis to SiO.sub.2 and a titanium-containing compound in vapor form capable of being converted through thermal decomposition with oxidation or flame hydrolysis to TiO.sub.2;
- (b) passing said gas stream into the flame of a combustion burner to form amorphous particles of fused SiO.sub.2 doped with TiO.sub.2 and containing submicroscopic crystals of rutile and anatase with rutile being the predominant crystal phase;
- (c) depositing said amorphous particles onto a mandrel;
- (d) consolidating said deposit of amorphous particles into a non-porous, transparent glass body;
- and
- (e) drawing waveguide fiber from said body;
- the improvement comprising utilizing as said titanium-containing compound in vapor form a halide-free, titanium-containing compound selected from the group consisting of titanium-2-ethylhexyloxide, titanium cyclopentyloxide, and a titanium amide, or a combination thereof, whereby no halide-containing vapors are emitted from said titania-containing compound during the making of said optical waveguide fibers.
4 more elements
In a method for making optical waveguide fibers of high purity fused silica glass doped with titania comprising steps of:
- (a) producing a gas stream containing a silicon-containing compound in vapor form capable of being converted through heat treatment with oxidation or flame hydrolysis to SiO.sub.2 and a titanium-containing compound in vapor form capable of being converted through thermal decomposition with oxidation of flame hydrolysis to TiO.sub.2;
- (b) passing said gas stream into a flame of a combustion burner to form amorphous particles of fused SiO.sub.2 doped with TiO.sub.2 and containing submicroscopic crystals of rutile and anatase with rutile being the redominant crystal phase;
- (c) depositing said amorphous particles onto the surface of a bait tube;
- (d) consolidating said amorphous particles into a non-porous, transparent glass body;
- and
- (e) drawing waveguide fiber from said body;
- the improvement comprising utilizing as said titanium-containing compound in vapor form a halide-free, titanium-containing compound selected from the group consisting of titanium-2-ethylhexyloxide, titanium cyclopentyloxide, and a titanium amide, or a combination thereof, whereby no halide-containing vapors are emitted from said titanium-containing compound during the making of said optical waveguide fibers.
4 more elements
Dependencies are inferred from the claim text.