Glass-ceramic for magnetic disks and method for manufacturing the same
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United States of America Patent
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Feb 21, 1995
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N/A
app pub date -
May 25, 1994
filing date -
May 19, 1993
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Abstract
A glass-ceramic for a magnetic disk substrate in which the grain size can be controlled and the surface roughness after polishing is within the range from 15 .ANG. to 50 .ANG. is provided by heat treating a base glass including in weight percent:
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