Improvements to induction furnaces for the synthesis of glasses

Details Improvements to induction furnaces for the synthesis of glasses Improvements to induction furnaces for the synthesis of glasses

C - Chemistry, Metallurgy

03

B

C03B 5/02 (2006.01) C03B 5/08 (2006.01) F27D 11/06 (2006.01)

Patent

CA 2243877

In an induction furnace for the synthesis of glasses, in particular fluorozirconate glasses for optical fibres for telecommunications, the support device (6') for the crucible (3) is associated with a pair of sleeves (7, 9) between which an annular element (8) which constitutes the actual support element is inserted. The first sleeve (7) has such longitudinal dimensions that the crucible (3) is supported in the annular element (8) in such a way as to be spaced from the planar element (5'), and the second sleeve has such longitudinal dimensions that its top edge is at a level higher than that of the top edge of the crucible (3), to obtain a homogeneous temperature region extending at least along the entire height of the crucible (3) (Fig.2).

Four à induction utilisé pour la fabrication du verre, en particulier les verres au fluorozirconate pour fibres optiques servant aux télécommunications, le dispositif de support (6') du creuset (3) est relié à deux manchons (7, 9) entre lesquels un élément annulaire (8) constituant l'élément de support réel est introduit. Le premier manchon (7) a une longueur qui permet à l'élément annulaire (8) de supporter le creuset (3) pour qu'il soit éloigné de l'élément plat (5'), et le deuxième manchon a une longueur telle que son bord supérieur est à un niveau plus élevé que celui du bord supérieur du creuset (3), pour obtenir une région dont la température est homogène qui s'étend au moins sur toute la hauteur du creuset (3) (Fig. 2).

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