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    • 126. 发明授权
    • Glass composition for magnetic disk substrates and magnetic disk
substrate
    • 用于磁盘基板和磁盘基板的玻璃组合物
    • US5691256A
    • 1997-11-25
    • US773260
    • 1996-12-23
    • Tomoyuki TaguchiHideki KawaiTohru OharaIkuo KuriyamaHajimu Wakabayashi
    • Tomoyuki TaguchiHideki KawaiTohru OharaIkuo KuriyamaHajimu Wakabayashi
    • C03C3/097C03C10/00C03C10/04C03C21/00C03C10/12
    • C03C21/002C03C10/0027C03C3/097G11B5/7315
    • A glass composition for magnetic disk substrates comprising as oxides: from 66 to 80% by weight of SiO.sub.2, from 5 to 15% by weight of Al.sub.2 O.sub.3, from 3 to 8.5% by weight of Li.sub.2 O, from 0 to 3% by weight of Na.sub.2 O, from 0 to 3% by weight of K.sub.2 O, from 0.5 to 8% by weight of TiO.sub.2, from 3.5 to 8% by weight of ZrO.sub.2, from 0.5 to 3% by weight of P.sub.2 O.sub.5, from 0 to 2% by weight of Sb.sub.2 O.sub.3, and from 0 to 2% by weight of As.sub.2 O.sub.3, and having a theoretical optical basicity of 0.548 or less; a magnetic disk substrate which is prepared by forming and polishing the above glass composition, followed by chemically strengthening the polished substrate by ion exchange or by forming, heat treating, and polishing the above composition and contains Li.sub.2 O.multidot.2SiO.sub.2 and/or spodumene as the main crystalline phase. The glass composition for magnetic disk substrates can easily be formed, can easily be polished after crystallization of the glass by heat treatment or chemically strengthened by ion exchange of the glass after forming and polishing, and is used for preparing magnetic disk substrates which has excellent chemical durability, mechanical strength, heat resistance, surface flatness, and surface smoothness, and shows little degradation of magnetic film characteristics by alkali migration.
    • 一种用于磁盘衬底的玻璃组合物,其包含氧化物:66至80重量%的SiO 2,5至15重量%的Al 2 O 3,3至8.5重量%的Li 2 O,0至3重量%的Na 2 O ,0〜3重量%的K 2 O,0.5〜8重量%的TiO 2,3.5〜8重量%的ZrO 2,0.5〜3重量%的P 2 O 5,0〜2重量%的Sb 2 O 3 ,0〜2重量%的As2O3,理论光学碱度为0.548以下; 通过形成和研磨上述玻璃组合物制备的磁盘基片,然后通过离子交换或通过成形,热处理和抛光上述组合物化学强化抛光的基片,并含有Li 2 O x 2 SiO 2和/或锂辉石作为主晶相 。 用于磁盘基板的玻璃组合物可以容易地形成,可以通过热处理在玻璃结晶后容易地进行抛光或者在成形和抛光后通过离子交换玻璃进行化学强化,并用于制备具有优异化学性质的磁盘基片 耐久性,机械强度,耐热性,表面平坦性和表面平滑性,并且通过碱迁移显示出很小的磁性膜特性劣化。