Sol-gel method for making ultra-low expansion glass
    42.
    发明授权
    Sol-gel method for making ultra-low expansion glass 失效
    制造超低膨胀玻璃的溶胶 - 凝胶法

    公开(公告)号:US4786618A

    公开(公告)日:1988-11-22

    申请号:US55632

    申请日:1987-05-29

    Inventor: Robert D. Shoup

    Abstract: Ultra-low thermal expansion TiO.sub.2 --SiO.sub.2 glasses are prepared using a sol-gel process wherein a stable alkali silicate solution comprising colloidal TiO.sub.2 and having a pH above 9 is gelled to form a semisolid silicate gel, the gel comprising homogeneously dispersed colloidal TiO.sub.2 but being essentially free of agglomerated TiO.sub.2 particles, washing the gel with aqueous media to remove alkali therefrom, and finally drying and consolidating the gel to a clear, void-free TiO.sub.2 --SiO.sub.2 glass which is substantially free of compositional inhomogeneities and has a thermal expansion coefficient below that of pure fused silica.

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