Method for manufacturing a crystalized glass magnetic disk substrate
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United States of America Patent
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Oct 22, 1996
Issued Date -
N/A
app pub date -
May 16, 1995
filing date -
May 19, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic disk substrate is made of a glass-ceramic having crystal phases of lithium disilicate (Li.sub.2 O.2SiO.sub.2) and alpha-quartz (SiO.sub.2). The crystal phase of alpha-quartz is formed of grown crystal grains each having a globular grain structure made of aggregated particles. Each globular grain has a size within a range from 0.3 .mu.m to 3 .mu.m. Surface roughness (Ra) of a polished surface of the magnetic disk substrate is within a range from 15 .ANG. to 50 .ANG. which is an optimum range of surface roughness for the magnetic disk.
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