Glass manufacturing – Processes – Sol-gel or liquid phase route utilized
Patent
1998-03-16
2000-12-12
Vincent, Sean
Glass manufacturing
Processes
Sol-gel or liquid phase route utilized
C03B 802
Patent
active
061582441
ABSTRACT:
Optical quality glass having a selected refractive index is produced by a two stage drying process. A gel is produced using sol-gel chemistry techniques and first dried by controlled evaporation until the gel volume reaches a pre-selected value. This pre-selected volume determines the density and refractive index of the finally dried gel. The gel is refilled with solvent in a saturated vapor environment, and then dried again by supercritical extraction of the solvent to form a glass. The glass has a refractive index less than the full density of glass, and the range of achievable refractive indices depends on the composition of the glass. Glasses having different refractive indices chosen from an uninterrupted range of values can be produced from a single precursor solution.
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Hrubesh Lawrence W.
Poco John F.
Grzybicki Daryl S.
Horgan Christopher J.
The Regents of the University of California
Thompson Alan H.
Vincent Sean
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