Method for manufacturing a crystalized glass magnetic disk subst

Details Method for manufacturing a crystalized glass magnetic disk subst Method for manufacturing a crystalized glass magnetic disk subst

1995-05-16

1996-10-22

Resan, Stevan A.

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

65 338, 65111, 501 5, 501 7, 501 10, 428694ST, 428694SG, C03B 3200

Patent

active

055672175

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.

REFERENCES:
patent: 3231456 (1966-01-01), McMillan
patent: 3977857 (1976-08-01), Mattox
patent: 4908727 (1990-03-01), Ezaki et al.
patent: 5093173 (1992-03-01), Nakagawa et al.

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