Glass for information recording media substrate, glass substrate for magnetic disk and magnetic disk
A technology for information recording and glass substrates, which is applied in the fields of glass substrates for information recording media, glass substrates for magnetic disks, and magnetic disks. It can solve problems such as the disappearance of recorded information and the decline in the reliability of recording media, reduce motor load, and solve dirt adhesion. Problems, the effect of high acid resistance
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[0062] SiO according to the table 2 to ZrO 2 The raw materials of each component are adjusted to the composition expressed in mol% in the column of , and melted at a temperature of 1550-1600° C. for 3-5 hours in a platinum crucible. During melting, a platinum stirrer was inserted into the molten glass and stirred for 2 hours to homogenize the glass. Then, the molten glass was flow-formed into a flat plate, and annealed to room temperature at a cooling rate of 1° C. per minute. Al+Mg+Ti in the table means Al 2 o 3 , MgO and TiO 2 The total of each content (unit: mole %), R 2 O stands for Li 2 O, Na 2 O and K 2 The total of the contents of O (unit: mol %).
[0063] The glasses of Examples 1 to 31 are examples, and the glasses of Examples 32 to 41 are comparative examples. The glass of Example 32 is the same glass as the commercially available chemically strengthened glass, and the glass of Example 33 is a chemically strengthened glass.
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