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    • 8. 发明申请
    • GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
    • 用于磁记录介质和磁记录介质的玻璃基板
    • US20120107647A1
    • 2012-05-03
    • US12941832
    • 2010-11-08
    • Naomi MATSUMOTOKinobu OSAKABEYoichi HACHITANI
    • Naomi MATSUMOTOKinobu OSAKABEYoichi HACHITANI
    • G11B5/73C03C3/087C03C3/085C03C3/097C03C3/095
    • G11B5/7315C03C3/087C03C3/095C03C3/097
    • An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass comprising, denoted as molar percentages, 56 to 75 percent of SiO2, 1 to 11 percent of Al2O3, more than 0 percent but equal to or less than 4 percent of Li2O, equal to or more than 1 percent but less than 15 percent of Na2O, equal to or more than 0 percent but less than 3 percent of K2O, and substantially no BaO, with a total content of Li2O, Na2O, and K2O falling within a range of 6 to 15 percent, with a molar ratio (Li2O/Na2O) being less than 0.50, with a molar ratio {K2O/(Li2O+Na2O+K2O)} being equal to or less than 0.13, with a total content of MgO, CaO, and SrO falling within a range of 10 to 30 percent, with a total content of MgO and CaO falling within a range of 10 to 30 percent, with a molar ratio {(MgO+CaO)/(MgO+CaO+SrO)} being equal to or more than 0.86, with a total content of the above alkali metal oxides and alkaline earth metal oxides falling within a range of 20 to 40 percent, with a molar ratio {(MgO+CaO+Li2O)/(Li2O+Na2O+K2O+MgO+CaO+SrO)} being equal to or more than 0.50, with a total content of ZrO2, TiO2, Y2O3, La2O3, Gd2O3, Nb2O5, and Ta2O5 being more than 0 percent but equal to or less than 10 percent, and with a molar ratio {(ZrO2+TiO2+Y2O3+La2O3+Gd2O3+Nb2O5+Ta2O5)/Al2O3} being equal to or more than 0.40, as well as having a glass transition temperature of equal to or higher than 600° C., an average coefficient of linear expansion of equal to or higher than 70×10−7/° C. at 100 to 300° C., and a Young's modulus of equal to or higher than 80 GPa.
    • 本发明的一个方面涉及一种用于磁记录介质的玻璃基板,其由玻璃构成,其包括以摩尔百分率表示56至75%的SiO 2,1至11%的Al 2 O 3,大于0%但等于 或小于4%的Li 2 O,等于或大于1%但小于15%的Na 2 O,等于或大于0%但小于3%的K 2 O,并且基本上不含BaO,总含量为Li 2 O, Na 2 O和K 2 O的摩尔比(K 2 O /(Li 2 O + Na 2 O + K 2 O))等于或小于0.13,摩尔比(Li 2 O / Na 2 O)小于0.50,6〜15% ,MgO,CaO和SrO的总含量在10〜30%的范围内,MgO和CaO的总含量在10〜30%的范围内,摩尔比{(MgO + CaO) /(MgO + CaO + SrO)}等于或大于0.86,上述碱金属氧化物和碱土金属氧化物的总含量在 20%〜40%的摩尔比((MgO + CaO + Li 2 O)/(Li 2 O + Na 2 O + K 2 O + MgO + CaO + SrO))等于或大于0.50,ZrO 2的总含量, TiO 2,Y 2 O 3,La 2 O 3,Gd 2 O 3,Nb 2 O 5和Ta 2 O 5大于0%但等于或小于10%,摩尔比{(ZrO 2 + TiO 2 + Y 2 O 3 + La 2 O 3 + Gd 2 O 3 + Nb 2 O 5 + Ta 2 O 5)/ Al 2 O 3} 等于或大于0.40,玻璃化转变温度等于或高于600℃,平均线膨胀系数为70×10-7 /℃,100℃ 至300℃,杨氏模量等于或高于80GPa。