| 摘要 |
<p>The process for the production of a rod of halogenated, in particular fluorinated, glass comprises the following operations: - a powder (6) consisting of a mixture of halogenated products is distributed continuously on a support (1) capable of being moved continuously vertically from the top downwards, the said support being placed, at the beginning of the start-up of the process, inside a container (4) which has a cylindrical internal cavity (5) whose section is a few tens of microns greater than that of the rod to be produced, the said container comprising heating means (4A) to ensure the melting of the pulverulent material, - a gas is continuously injected between the rod being formed and the wall of the said cylindrical cavity (5) so as to produce a gas layer (7) a few tens of microns in thickness at a pressure above that which surrounds the container and continuously adjusted so as to avoid any contact between the material of the rod and the said inner wall of the container, - the upper part of the rod being formed is heated so as to create a zone (12) in which the viscosity of the material is of the order of one poise, promoting the removal of microbubbles. Application to the production of laser matrices or of preforms for drawing optical fibres. <IMAGE></p> |
