"> Production of alumina ceramics reinforced with .beta.'
    1.
    发明授权
    Production of alumina ceramics reinforced with .beta.'"-alumina 失效
    生产用“铝”氧化铝增强的氧化铝陶瓷

    公开(公告)号:US5081082A

    公开(公告)日:1992-01-14

    申请号:US618569

    申请日:1990-11-27

    IPC分类号: C04B35/111 C04B35/80

    CPC分类号: C04B35/803 C04B35/111

    摘要: A process for producing strong alumina ceramics in which needle-shaped .beta.'"-alumina grains are homogeneously distributed in an .alpha.-alumina matrix to provide an increase in bending strength, as compared to the alumina ceramics without .beta.'"-alumina, when fired under similar conditions. The process comprises mixing .alpha.-alumina powder and salts of sodium and magnesium, in a Na:Mg mol ratio of 1:2; wet-mixing and calcining the mixture to form a mixture of (100-5X) mols of Al.sub.2 O.sub.3 +X(Na.sub.2 O+4MgO), wherein X is the number of mols and is not more than 3; forming a dense green body of the calcined mixture and sintering the green body at a temperature and for a time sufficient to form in-situ particles of .beta.'"-alumina distributed in the .alpha.-alumina.

    摘要翻译: 与没有β“ - 氧化铝的氧化铝陶瓷相比,生产强氧化铝陶瓷的方法,其中针状β” - 氧化铝颗粒均匀分布在α-氧化铝基体中以提供弯曲强度的增加, 在类似的条件下被烧。 该方法包括以1:2的Na:Mg摩尔比混合α-氧化铝粉末和钠和镁的盐; 湿混合并煅烧混合物以形成(100-5X)摩尔的Al2O3 + X(Na2O + 4MgO)的混合物,其中X是摩尔数,不大于3; 形成煅烧混合物的致密的生坯,并在足以形成分布在α-氧化铝中的原位生成的“氧化铝”颗粒的温度和时间内烧结生坯。