Method of making a soot preform compositional profile

Details Method of making a soot preform compositional profile Method of making a soot preform compositional profile

1980-07-03

1981-11-03

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 32, 65 184, C03B 1906, C03B 37025, C03B 37075

Patent

active

042983657

ABSTRACT:
A method of making solid glass articles by the flame hydrolysis technique. A thin stratum of low viscosity glass soot is applied to the surface of a mandrel. First and second coatings of glass soot are deposited on the surface of the thin stratum to form a porous preform. The refractive index of the soot particles of the first coating is greater than that of the soot of the second coating, and the soot of the first coating has a viscosity lower than that of the second coating. The mandrel is removed, and the soot preform is subjected to a high temperature whereby it is consolidated to form a dense glass blank. The glass surface tension and the relative viscosities of the inner and outer portions of the preform cause the aperture to close during the consolidation process. The thin stratum, which preferably includes P.sub.2 O.sub.5, smoothes over the damage caused by removing the mandrel and reduces or even eliminates seed formation at the axis of the resultant glass blank. The blank may be heated and drawn into a filament, or it may be sliced into optical windows, lenses or the like.

REFERENCES:
patent: 3823995 (1974-07-01), Carpenter
patent: 4042404 (1977-08-01), Schultz
patent: 4204850 (1980-05-01), Dominick et al.
patent: 4251251 (1981-02-01), Blankenship

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