Glass-ceramic for magnetic disks and method for manufacturing th

Details Glass-ceramic for magnetic disks and method for manufacturing th Glass-ceramic for magnetic disks and method for manufacturing th

1994-05-25

1995-02-21

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 6, 501 63, C03C 1012, C03C 1014

Patent

active

053915224

ABSTRACT:
A glass-ceramic for a magnetic disk substrate in which the grain size can be controlled and the surface roughness after polishing is within the range from 15 .ANG. to 50 .ANG. is provided by heat treating a base glass including in weight percent:

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patent: 3804608 (1974-04-01), Gaskell et al.
patent: 3977857 (1976-08-01), Mattox
patent: 4414282 (1983-11-01), McCollister
patent: 4480044 (1984-10-01), McAlinn
patent: 4515634 (1985-05-01), Wu et al.
patent: 4672152 (1987-06-01), Shinohara et al.
patent: 5219799 (1993-06-01), Beall et al.

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