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

C - Chemistry, Metallurgy

03

C

C03C 1/00 (2006.01) C03B 19/12 (2006.01) C03C 3/06 (2006.01)

Patent

CA 2515531

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.

L'invention a trait à un procédé de production d'articles vitreux, qui consiste : à procéder à l'hydrolyse et à la polycondensation d'une solution ou d'une suspension d'un précurseur approprié, comprenant principalement un alcoxyde de silicium ; et à sécher le gel obtenu dans une chambre de pression, un solvant non protique, principalement de l'acétone, ayant été substitué au solvant en gel, sous un écoulement d'azote, et ce à des conditions de température et de pression inférieures aux valeurs critiques du solvant en gel. Le gel séché est ensuite densifié par traitement thermique.

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