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Invention Grant
US07767607B2 Glass composition, glass article, glass substrate for magnetic recording media, and method for producing the same 有权
玻璃组合物，玻璃制品，磁记录介质用玻璃基板及其制造方法

Glass composition, glass article, glass substrate for magnetic recording media, and method for producing the same
Abstract:
A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO2, 5 to 20 wt % Al2O3, 0 to 1 wt % Li2O, 3 to 18 wt % Na2O, 0 to 9 wt % K2O, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiO2 and 0 to 1 wt % ZrO2, wherein the sum of Li2O, Na2O and K2O is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.
Abstract(Chinese):

本发明的用于具有高耐热性和易于化学强化能力的磁记录介质的本发明的玻璃基板尚未得到，其为基本上包含60至70重量％的SiO 2，5至20重量％的Al 2 O 3，0至 1重量％Li 2 O，3〜18重量％Na 2 O，0〜9重量％K 2 O，0〜10重量％MgO，1〜15重量％CaO，0〜4.5重量％SrO，0〜1重量％BaO，0〜1 重量％TiO 2和0〜1重量％的ZrO 2，其中Li 2 O，Na 2 O和K 2 O的总和为5〜25重量％，MgO，CaO，SrO和BaO的总和为5〜20重量％。

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