Improved vitreous silica products

Details Improved vitreous silica products Improved vitreous silica products

C - Chemistry, Metallurgy

01

B

C01B 33/18 (2006.01) C03B 19/14 (2006.01) C03B 37/014 (2006.01) C03B 37/018 (2006.01) C03C 1/00 (2006.01) C03C 3/06 (2006.01) C03C 12/00 (2006.01) C03C 17/245 (2006.01)

Patent

CA 2047187

A process for the manufacture of a synthetic silica product by vapour-phase oxidation of a silica precursor material in a flame not less than 60 % of the silica in the deposited product being derived by oxidation of: (A) one or more straight chain volatile silicon compounds of the general formula: R3Si.O(SiR2O)n.SiR3 and/or (B) one or more cyclic volatile silicon compounds of the general formula: Si n O n(R)2n. Doped or undoped fume powder, porous silica soot or fully densified bodies made by the process are also claimed.

On décrit un procédé permettant de fabriquer un objet de silice synthétique par l'oxydation en phase vapeur d'un matériau précurseur de silice dans une flamme, 60 % ou plus du dioxyde de silicium dans le produit déposé étant dérivé par oxydation de (A) un ou plusieurs composés de dioxyde de silicium volatile à chaîne linéaire ayant la formule générale: R3Si.O(SiR2O)n.SiR3 et/ou (B) un ou plusieurs composés de dioxyde de silicium volatils cycliques ayant la formule générale: SinOn(R)2n. On décrit également des poudres de fumées (2) dopées ou non dopées, des suies de silice poreuse ou des corps complètement densifiés obtenus grâce audit procédé.

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