Sol-gel process for the production of glassy articles

Details Sol-gel process for the production of glassy articles Sol-gel process for the production of glassy articles

2007-02-27

2007-02-27

Gravini, S. (Department: 3749)

Drying and gas or vapor contact with solids

Process

Congealing or thickening

C034S329000, C034S362000, C034S372000, C034S393000, C065S017200, C501S054000, C516S085000

Reexamination Certificate

active

10542191

ABSTRACT:
Glassy articles are prepared by subjecting to hydrolysis and policondensation a solution or suspension of a suitable precursor, mainly comprising a silicon alkoxide, and by drying the obtained gel in a pressure chamber, the gel solvent having been substituted by a non-protic solvent, mainly acetone, under nitrogen flowing, at temperature and pressure conditions lower than the gel solvent critical values. The dried gel is then densified by a thermal treatment.

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