Glass substrate for information recording media and information recording medium
A technology for information recording and glass substrate, applied in the direction of magnetic recording, data recording, magnetic recording layer, etc., can solve problems such as inability to meet, reduced substrate surface smoothness, high smoothness, etc.
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Embodiment 1-11 and comparative example 1
[0055] As a starting material, SiO 2 、Al 2 o 3 , Al(OH) 3 , MgO, Mg(OH) 2 , MgCO 3 , CaCO 3 , Li 2 CO 3 、Na 2 CO 3 、TiO 2 and ZrO 2 etc., in order to obtain the glass with the composition shown in Table 1 and Table 2, weigh 300-1500g, mix thoroughly to make a blended batch, put it into a platinum crucible, and conduct glass in air at a temperature of 1400-1600°C. The melting takes about 3-8 hours. After melting, let the molten glass flow into a 40×40×20mm carbon mold, let it cool to the transition point temperature of the glass, put it into the annealing furnace immediately, keep it for 1 hour, and then cool it naturally in the furnace to room temperature. The resulting glass did not precipitate microscopically observable crystals.
[0056] The glass thus obtained was processed into 40×20×15 mm, 5Φ×20 mm, and 30×30×2 mm to prepare samples for evaluation of various physical properties, and each physical property was measured by the method shown below.
[0057] Tab...
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