Method for manufacturing a magnetic disk substrate

Details Method for manufacturing a magnetic disk substrate Method for manufacturing a magnetic disk substrate

1995-10-31

1999-02-09

Breneman, R. Bruce

Etching a substrate: processes

Nongaseous phase etching of substrate

Using film of etchant between a stationary surface and a...

252 791, 51308, 51309, 501 4, B44C 122, C03C 1000

Patent

active

058689532

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.

REFERENCES:
patent: 4690846 (1987-09-01), Wada et al.
patent: 5228886 (1993-07-01), Zipperian
patent: 5391522 (1995-02-01), Goto et al.
patent: 5571373 (1996-11-01), Krishna et al.
patent: 5580363 (1996-12-01), Goto et al.

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