Method for producing high quality fused silica
    1.
    发明授权
    Method for producing high quality fused silica 失效
    生产高质量二氧化硅的方法

    公开(公告)号:US3806570A

    公开(公告)日:1974-04-23

    申请号:US23974272

    申请日:1972-03-30

    摘要: There is disclosed a method and apparatus for providing optically pure water-free fused silica blanks, tubing and crucibles for use in forming optical waveguides, lenses, prisms, filters, and high temperature lamp envelopes, in which soot is deposited on a high purity graphite bait or refractory low expansion glass, glass-ceramic or suitable crystalline ceramic bait by a flame hydrolysis method in which the burner is located close to the bait. This results in an exceptionally dense soot preform. The preform is later sintered in an inert dry atmosphere by slowly inserting the soot covered bait into a furnace in such a manner that entrapped gas is forced from the fused silica during the slow insertion into the furnace maintained at a temperature above 1,400*C. The formation of bubbles within the fused silica is prevented because of the inert atmosphere and because the gases in the preform escape through the unsintered portions of the preform, thereby providing a crucible or blank of fused silica of exceptionally high optical quality.

    摘要翻译: 公开了一种用于提供用于形成光波导,透镜,棱镜,过滤器和高温灯泡的光学纯净无水熔融石英毛坯,管和坩埚的方法和装置,其中烟灰沉积在高纯度石墨上 诱饵或耐火低膨胀玻璃,玻璃陶瓷或适宜的结晶陶瓷诱饵,其中燃烧器位于靠近诱饵的火焰水解方法。 这导致了非常密集的烟灰预制件。 将预制件随后在惰性干燥气氛中通过将烟炱覆盖的饵料慢慢地插入炉中以使得在缓慢插入保持在1400℃以上的炉中的熔融二氧化硅的方式被迫使气体被压制的惰性干燥气氛中烧结。 由于惰性气氛,因为预制件中的气体逸出预成型体的未烧结部分,因此可以防止熔融二氧化硅内的气泡的形成,从而提供极高的光学质量的熔融二氧化硅的坩埚或坯料。