Glass-ceramic substrate for a magnetic disk

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

1998-09-10

1999-11-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

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

Patent

active

059857773

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.SiO.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: 5567217 (1996-10-01), Goto et al.
patent: 5582363 (1996-12-01), Goto et al.
patent: 5626935 (1997-05-01), Goto et al.
patent: 5744208 (1998-04-01), Bealle et al.
patent: 5804520 (1998-09-01), Morinaga et al.

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