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    • 6. 发明授权
    • Method and containment vessel for producing fused silica glass and the
fused silica blank produced
    • 用于生产熔融石英玻璃的方法和容纳容器以及生产的熔融二氧化硅毛坯
    • US5698484A
    • 1997-12-16
    • US712296
    • 1996-09-11
    • John E. Maxon
    • John E. Maxon
    • C03B19/01C03B8/04C03B19/14C03C3/06C03B20/00
    • C03C3/06C03B19/1407C03B19/1423C03B19/1453C03B19/1492C03B2207/52Y10S501/90Y10S65/08
    • Fused silica boules (19) having improved homogeneity are produced by causing the boule (19) to flow radially during its formation to achieve local mixing between portions of the boule which may have experienced different laydown conditions. The mixing is achieved by one or a combination of: (1) use of a containment vessel (13) having a gently sloping containment wall (22); (2) use of a containment vessel (13) whose inner radius (r.sub.v) is substantially larger than the outermost radius (r.sub.b) of the burners (14) used to produce the boule (19); and/or (3) maintaining the boule (19) at a sufficiently high temperature during laydown so that radial flow is achieved with a minimum head height of glass. Large blanks having high homogeneity can be made from such boules, e.g., blanks having diameters above 200 millimeters and .DELTA.n values of less than 0.25.times.10.sup.-6.
    • 具有改善的均匀性的熔融二氧化硅凝胶(19)通过在其形成期间使轴(19)径向流动而产生,以实现可能经历不同沉积条件的芯的部分之间的局部混合。 混合通过以下一种或组合来实现:(1)使用具有缓缓倾斜的容纳壁(22)的容纳容器(13); (2)使用其内半径(rv)基本上大于用于制造该坯料(19)的燃烧器(14)的最外半径(rb)的容纳容器(13); 和/或(3)在沉积期间将该保持棒(19)保持在足够高的温度,以便以最小的玻璃头部高度实现径向流动。 具有高均匀性的大坯料可以由这样的毛坯制成,例如直径大于200毫米的坯料和小于0.25×10 -6的DELTA n值。