Method for manufacturing a magnetic disk substrate
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United States of America Patent
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Feb 9, 1999
Grant Date -
N/A
app pub date -
Oct 31, 1995
filing date -
Nov 16, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing a magnetic disk substrate includes a step of polishing a glass-ceramic having a crystal phase consisting of crystal grains having an average diameter of less than 3 .mu.m with a polishing material having a grain diameter smaller than the diameter of the crystal grain. In one aspect of the invention, the glass-ceramic includes lithium disilicate (Li.sub.2 O--2SiO.sub.2) and alpha-quartz (alpha-SiO.sub.2) as predominant crystal phases and grown crystal grains of the alpha-quartz each have a globular grain structure consisting of aggregated particles and have a diameter within a range of 0.3 .mu.m-3.0 .mu.m.
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