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发明授权
US08883330B2 Glass for chemical strengthening, substrate for information recording media and information recording media 有权
用于化学强化的玻璃，用于信息记录介质的衬底和信息记录介质

Glass for chemical strengthening, substrate for information recording media and information recording media
摘要：
A glass for use in chemical reinforcement for use in a substrate of an information recording medium, having a composition comprising, denoted as mol %: SiO247 to 70%  Al2O31 to 10% (where the total of SiO2 and Al2O3 is 57 to 80%) CaO2 to 25% BaO1 to 15% Na2O1 to 10% K2O0 to 15% (where the total of Na2O and K2O is 3 to 16%) ZrO21 to 12% MgO0 to 10% SrO0 to 15% (where the ratio of the content of CaO to the total of MgO, CaO, SrO, and BaO is greater than or equal to 0.5) ZnO0 to 10% (where the total of MgO, CaO, SrO, BaO, and ZnO is 3 to 30%) TiO20 to 10% and the total content of the above-stated components is greater than or equal to 95%. A glass for use in chemical reinforcement for use in the substrate of an information recording medium employed in a perpendicular magnetic recording system, in which the glass exhibits the glass transition temperature is greater than or equal to 600° C. A substrate for use in an information recording medium consisting of the above glass and being chemically reinforced. A substrate for an information recording medium consisting of a chemically reinforced glass having a glass transition temperature of greater than or equal to 600° C. and exhibiting a bending strength following heating for two hours at 570° C. of greater than or equal to 15 kgf/mm2. An information recording medium comprising an information recording layer on the above substrate for an information recording medium. The present invention provides glass having both high thermal resistance and high strength, a substrate for use in information recording media comprised of this glass, and an information recording medium employing such a substrate.
摘要（中）：

用于信息记录介质的基板中的化学增强用玻璃，其具有以摩尔％表示的组成：SiO 2 47〜70％Al 2 O 3 1〜10％（SiO 2和Al 2 O 3的总和为57〜80 ％）CaO 2〜25％BaO 1〜15％Na 2 O 1〜10％K2O 0〜15％（Na2O和K2O的总和为3〜16％）ZrO2 1〜12％MgO 0〜10％SrO 0〜15 ％（CaO的含量与MgO，CaO，SrO和BaO的总量的比例大于等于0.5）ZnO 0〜10％（MgO，CaO，SrO，BaO，ZnO的总量 为3〜30％）TiO 2为0〜10％，上述成分的总含量为95％以上。 用于在垂直磁记录系统中使用的信息记录介质的基板中的玻璃，其中所述玻璃呈玻璃化转变温度大于或等于600℃。 信息记录介质，由上述玻璃构成，并被化学强化。 一种用于信息记录介质的基板，由玻璃化转变温度大于或等于600℃的化学强化玻璃组成，并且在570℃下加热2小时后的弯曲强度大于或等于15 kgf / mm2。 一种信息记录介质，包括在上述信息记录介质用基板上的信息记录层。 本发明提供具有高热阻和高强度的玻璃，用于由该玻璃构成的信息记录介质的基板和使用这种基板的信息记录介质。

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