Tube furnace
    13.
    发明专利

    公开(公告)号:GB2192698A

    公开(公告)日:1988-01-20

    申请号:GB8617158

    申请日:1986-07-15

    Applicant: STC PLC

    Abstract: An induction furnace for drawing glass optical fibres from a preform has a R.F. powdered (7) susceptor element comprising a zirconia ring (1) within which the work if heated, located end wise between upper and lower rings (3), e.g. of silica, silicon carbide, alumina, titania, the zirconia ring (1) along its entire length reaching temperatures above any phase change so that the preform and fibre are not contaminated by zirconia particles. The three rings are located inside a tubular-zirconia support 4 and a silica "can" 6.

    16.
    发明专利
    未知

    公开(公告)号:DK440385A

    公开(公告)日:1986-03-30

    申请号:DK440385

    申请日:1985-09-27

    Applicant: STC PLC

    Abstract: In order to eliminate the effect of water attack on silica optical fibres, the fibres are provided with a surface layer of silicon nitride or silicon oxynitride. The method proposed comprises direct nitridation. This may be achieved by adding a nitriding atmosphere to the drawing furnace gases, or to the reactive gases (TiCl4 and SiCl4) incorporated in the flame of an oxyhydrogen torch for the formation of a compressive silica/titania layer on an optical fibre by a glass soot deposition and sintering process.

    OPTICAL FIBRES
    20.
    发明专利

    公开(公告)号:ZA857466B

    公开(公告)日:1986-05-28

    申请号:ZA857466

    申请日:1985-09-27

    Applicant: STC PLC

    Abstract: In order to eliminate the effect of water attack on silica optical fibres, the fibres are provided with a surface layer of silicon nitride or silicon oxynitride. The method proposed comprises direct nitridation. This may be achieved by adding a nitriding atmosphere to the drawing furnace gases, or to the reactive gases (TiCl4 and SiCl4) incorporated in the flame of an oxyhydrogen torch for the formation of a compressive silica/titania layer on an optical fibre by a glass soot deposition and sintering process.

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