A sintering furnace for the production of a quartz preform

C - Chemistry – Metallurgy – 03 – B

Patent

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49/53, 39/7, 49/

C03B 37/014 (2006.01) C03B 20/00 (2006.01)

Patent

CA 2029881

A furnace used for conducting at least one of the steps of dehydration, fluorine addition and sintering of a porous quartz base material prepared by flame hydrolysis techniques such as vapor-phase axial deposition or outside seeding, which makes it possible to keep completely airtight the joints of a long core tube which cannot be manufactured monolithically, to prevent moisture, oxygen and other impurities contained in the outer atmosphere from intruding inside the core tube, and to prevent corrosive and toxic gases present inside the core tube from leaking outside. The core tube is made of high-purity carbon with its inner wall and/or outer wall being coated with a gas-impermeable coating film. It has a cylindrical form with its axis extending lengthwise, and is divided into several portions along the axis, and the upper and lower edges of each of said divided portions are flattened to provide contact faces, which are sealed with carbon packing interposed therebetween. The core tube has a mechanism for axially pushing it with a uniform force from around its periphery.

Four destiné à réaliser au moins une des étapes de déshydratation, adjonction de fluor et frittage d'une matière poreuse à base de quartz, préparée par des techniques d'hydrolyse à la flamme, comme par exemple le dépôt axial en phase vapeur ou ensemencement extérieur. Ledit four permet de garder hermétiques les raccords d'un tube long qui ne peut être fabriqué d'une seule pièce, afin d'empêcher que l'humidité, l'oxygène et d'autres impuretés contenues dans l'atmosphère extérieure entrent dans ledit tube, et pour empêcher les gaz corrosifs et toxiques présents dans le tube d'échapper de ce dernier. Le tube est réalisé en carbone d'une pureté élevée, la paroi interne et/ou la paroi externe étant enrobées d'une pellicule imperméable au gaz. Ledit tube a un forme cylindrique et son axe s'étend longitudinalement, il est divisé en plusieurs parties le long de l'axe, et les rebords supérieur est inférieur de chaque partie sont aplatis pour servir de face de contact, qui sont obturés par une garniture au carbone. Ledit tube possède un mécanisme permettant son entraînement axial, par sa périphérie, tout en appliquant une force uniforme.

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