Process for the production of transparent dense glasses obtained from silicon or metal alkoxides by sol-gel route, and glasses obtained according to this process.

摘要

The present invention relates to a process for the manufacture of transparent glasses based on sol-gel metal alkoxides, comprising the following steps: BR/ A / A complete hydrolysis of a solution containing one or more metal alkoxides is carried out particular, in a solvent or a mixture of organic solvents or alkoxides with an acidic aqueous solution of pH less than 3; the reaction medium does not contain a complexing agent for the metal present in the alkoxide or alkoxides; BR/ B / The organic solvent (s) and the residual alcohols are removed and the resulting solution is concentrated by distillation so as to obtain a syrupy sol; BR/ C / The soil is placed in a form suitable for the intended application; BR/ D / Gelation and drying is carried out in air or under an inert atmosphere at a temperature below 70.degree. C .; BR/ E / The glass may be annealed in air or under an inert atmosphere at a temperature below 500.degree. C.