Silicon oxide based articles

C - Chemistry – Metallurgy – 03 – B

Patent

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C03B 19/12 (2006.01)

Patent

CA 2519667

Particularly shaped articles constituted by silicon oxide, as such or with suitable additives, prepared by room temperature molding according to a process comprising: preparation of a sol starting from a silicon alcoxide, or from a silicon alcoxide and at least a precursor of at least one of the additional elements; hydrolysis of the sol obtained thereby; addition of colloidal silica; pouring the resulting mixture into the desired mould; sol gelling and fast removal of the solid product; gel drying; gel densification by means of a thermal treatment at temperature ranging from 900 ~C to 1500 ~C. The articles can be used as preforms for the optical fiber spinning.

Ces articles de forme spécifique, constitués d'oxyde de silicium, tels quels ou avec des produits d'addition appropriés, produits par moulage à la température ambiante, sont réalisés grâce à un procédé consistant à préparer une solution de départ sol à partir d'un alcoxyde de silicium ou d'un alcoxyde de silicium et d'au moins un précurseur d'au moins l'un de ces éléments supplémentaires : hydrolyse du sol ainsi obtenue, ajout de silice colloïdale, puis à verser le mélange obtenu dans le moule souhaité, à gélifier le sol et à retirer le produit solide, à sécher le gel, puis à le densifier par traitement thermique à une température comprise entre 900 et 1500 ·C. On peut utiliser ces articles comme préformes pour filage de fibres optiques.

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