Method and apparatus for forming silica by combustion of...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/18 (2006.01) C03B 19/14 (2006.01) C03B 37/014 (2006.01)

Patent

CA 2289765

The present invention is directed to a method for making silica glass and silica glass preforms. A liquid, preferably halide-free, silicon-containing compound capable of being converted by thermal oxidative decomposition to SiO2 is provided and introduced directly into the flame of a combustion burner, which converts the compound to silica, thereby forming finely divided amorphous soot. The soot is vaporized proximate the site where the liquid is converted into silica glass by atomizing the liquid, preferably with a stream of atomizing gas. A heater proximate the burner face and around the burner flame increases soot capture rate and allows for a reduction of the velocity of the atomizing gas. The amorphous soot is deposited on a receptor surface where, either substantially simultaneously with or subsequently to its deposition, the soot is consolidated into a body of fused silica glass.

Cette invention a trait à un procédé de production de verre de silice et d'ébauches de verre de silice. On expose, dans le cadre de ce procédé, directement à la flamme d'un brûleur un composé liquide contenant du silicium, de préférence sans halogénure, susceptible de se transformer par décomposition oxydative en SiO¿2?, laquelle flamme transforme le composé en silice, formant ainsi une suie amorphe à grains fins. On pulvérise cette suie près de la zone où le liquide est transformé en verre de silice, de préférence au moyen d'un courant de gaz de pulvérisation. Un générateur de chaleur, se trouvant à proximité de la face du brûleur et de la flamme de celui-ci, renforce le rythme de capture de la suie et permet de réduire la vitesse de déplacement du gaz de pulvérisation. La suie amorphe se dépose sur une surface réceptrice où, quasiment simultanément à ce dépôt ou bien à la suite de celui-ci, elle se consolide en masse de verre de silice fondu.

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