Method for producing and processing a preform, preform and...

C - Chemistry – Metallurgy – 03 – B

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C03B 37/012 (2006.01) C03B 37/027 (2006.01)

Patent

CA 2752812

The method for producing and processing a preform (1p, 1s) comprises a preliminary process phase, in which silica grain (5a; 5b) is supplied into the interior space (110) of a silica tube (11) having an open upper end and a closed lower end (111), in order to obtain an unprocessed preform (1p, 1s ), and comprises a final process phase, in which the interior space (110) of the silica tube (11) is closed, a condition of reduced pressure is generated, the unprocessed preform (1p, 1s ) is heated with a final process temperature in order to fuse the silica tube (11) and the silica grain (5b). According to the invention the silica grain (5a; 5b) entering the interior space (110) is thermally treated during the preliminary process phase with an intermediate process temperature that lies under the melting point of the silica grain.

La présente invention concerne un procédé de production et de traitement d'une préforme (1p, 1s), le procédé comprenant une phase de traitement préliminaire au cours de laquelle des grains de silice (5a ; 5b) sont introduits dans le volume intérieur (110) d'un tube de silice (11) comportant une extrémité supérieure ouverte et une extrémité inférieure fermée (111) afin d'obtenir une préforme (1p, 1s) non traitée. Le procédé comprend également une phase de traitement final au cours de laquelle le volume intérieur (110) du tube de silice (11) est fermé, une condition de pression réduite est créée, la préforme (1p, 1s) non traitée est chauffée à une température de traitement final afin de fusionner le tube de silice (11) et les grains de silice (5b). Selon l'invention, les grains de silice (5a ; 5b) pénétrant dans le volume intérieur (110) subissent un traitement thermique pendant la phase de traitement préliminaire à une température de traitement intermédiaire inférieure au point de fusion des grains de silice.

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