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    • 8. 发明授权
    • Transparent and nonexpansive glass-ceramic
    • 透明和非膨胀玻璃陶瓷
    • US5017519A
    • 1991-05-21
    • US512366
    • 1990-04-23
    • Shigeki MorimotoKenji Sugiura
    • Shigeki MorimotoKenji Sugiura
    • C03C10/00C03C10/12C03C10/14
    • C03C10/0045
    • A transparent and colorless glass-ceramic containing crystals of .beta.-quartz and .beta.-eucryptite is obtained by heat-treating a glass essentially composed of 63-69 wt % of SiO.sub.2, 18-22 wt % of Al.sub.2 O.sub.3, 3-5 wt % of Li.sub.2 O, 1-3 wt % of MgO, 4-6 wt % of ZrO.sub.2, 0-2 wt % of ZnO, 0-2 wt % of P.sub.2 O.sub.5, 0-2 wt % of Na.sub.2 O, 0-2 wt % of BaO and 0.3-1 wt % of As.sub.2 O.sub.3, with proviso that the proportion of ZrO.sub.2 to SiO.sub.2 is not lower than a specified level and that the molar ratio of Al.sub.2 O.sub.3 to the total of Li.sub.2 O, MgO and ZnO is within a specified range. The thermal expansion coefficient of this glass-ceramic is very close to zero over the range from room temperature to about 300.degree. C.
    • 通过对基本上由63-69重量%的SiO 2,18-22重量%的Al 2 O 3,3〜5重量%的Al 2 O 3组成的玻璃进行热处理,得到含有β-石英和β-锂辉石的透明无色玻璃陶瓷, Li2O,1-3重量%的MgO,4-6重量%的ZrO 2,0-2重量%的ZnO,0-2重量%的P 2 O 5,0-2重量%的Na 2 O,0-2重量%的BaO和 0.3-1重量%的As2O3,条件是ZrO 2与SiO 2的比例不低于规定水平,并且Al 2 O 3与Li 2 O,MgO和ZnO的总量的摩尔比在特定范围内。 该玻璃陶瓷的热膨胀系数在室温至约300℃的范围内非常接近零。