Glass-ceramic substrate for a magnetic disk

Details Glass-ceramic substrate for a magnetic disk Glass-ceramic substrate for a magnetic disk

1997-02-03

1999-02-02

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 5, 501 63, 501 69, C03C 1004, C03C 1014

Patent

active

058664890

ABSTRACT:
A glass-ceramic substrate for a magnetic disk suitable for use as a contact recording type magnetic disk includes alpha-cristobalite (alpha-SiO.sub.2) and lithium disilicate (Li.sub.2 O . 2SiO.sub.2) as main crystal phases. The ratio of alpha-cristobalite/lithium disilicate is within a range from 0.25 to 0.35, a grain diameter of crystal grains is within a range from 0.1 .mu.m to 1.0 .mu.m, surface roughness (Ra) of the substrate after polishing is within a range from 2 .ANG. to 10 .ANG. and abrasion resistance index (Aa) of the substrate is within a range from 5 to 15.

REFERENCES:
patent: 4480044 (1984-10-01), McAlinn
patent: 5391522 (1995-02-01), Goto et al.
patent: 5567217 (1996-10-01), Goto et al.
patent: 5580363 (1996-12-01), Goto et al.
patent: 5626935 (1997-05-01), Goto et al.
Japanese Patent Application Laid-open No. Hei 6-329440, Nov. 29, 1994.

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