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    • 9. 发明授权
    • Ion-exchangeable germanate method for strengthened germanate glass
articles
    • 用于强化锗酸盐玻璃制品的可离子交换的锗酸盐法
    • US4849002A
    • 1989-07-18
    • US113936
    • 1987-10-27
    • Charles F. Rapp
    • Charles F. Rapp
    • C03C3/253C03C21/00
    • C03C3/253C03C21/002
    • Ion exchangeable glass compositions containing from 50 to 90 mole percent GeO.sub.2, from 5 to 30 mole percent Al.sub.2 O.sub.3, from 3 to 30 mole percent Li.sub.2 O, up to 30 mole percent Na.sub.2 O and up to 30 mole percent K.sub.2 O are provided. In another aspect, minor amounts of anhydrous fluorides and chlorides corresponding to these oxides are added to the glass compositions to aid in water removal. Glass articles formed of the germanate glass compositions of the present invention are readily ion exchangeable when contacted with certain salts. Strengthened germanate glass articles are also provided having an inner tension region and an outer compressive surface layer which provide good mechanical strength for the formed glass article. The strengthened germanate glass articles are made using the ion exchangeable germanate glass compositions of the present invention. The compressive surface layer of the strengthened germanate glass articles are formed by contacting the surface of the glass article with a suitable salt, preferably a molten alkali salt, in an ion exchange process. The surface compressive layer of the strengthened germanate glass article has a lower concentration of lithium ions than the inner tension region and has a higher concentration of select ions provided by the salt bath.
    • 提供了含有50至90摩尔%的GeO 2,5至30摩尔%的Al 2 O 3,3至30摩尔%的Li 2 O,至多30摩尔%的Na 2 O和至多30摩尔%的K 2 O的可离子交换玻璃组合物。 另一方面,将相当于这些氧化物的少量无水氟化物和氯化物加入到玻璃组合物中以有助于除水。 由本发明的锗酸盐玻璃组合物形成的玻璃制品在与某些盐接触时容易离子交换。 还提供了加强的锗酸盐玻璃制品,其具有内部张力区域和外部压缩表面层,其为所形成的玻璃制品提供良好的机械强度。 强化的锗酸盐玻璃制品使用本发明的可离子交换的锗酸盐玻璃组合物制成。 加强的锗酸盐玻璃制品的压缩表面层是通过在离子交换过程中使玻璃制品的表面与合适的盐,优选熔融的碱金属盐接触而形成的。 加强的锗酸盐玻璃制品的表面压缩层具有比内部张力区域低的锂离子浓度,并且具有由盐浴提供的更高浓度的选择离子。