Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1997-11-05
1999-10-26
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 7, 501 63, 428694ST, 428694SG, C03C 1014, C03C 1012
Patent
active
059728167
ABSTRACT:
A glass-ceramic substrate for a magnetic information storage medium such as a magnetic disk having a super flatness suited for a contact recording system includes a SiO.sub.2 --Al.sub.2 O.sub.3 --Li.sub.2 O system glass-ceramic and has either .beta.-quartz solid solution (.beta.-SiO.sub.2 solid solution) or a mixture of .beta.-quartz solid solution (.beta.-SiO.sub.2 solid solution) and .beta.-spodumene solid solution (.beta.-Li.sub.2 O.Al.sub.2 O.sub.3.4SiO.sub.2 solid solution) as its main crystal phase. The surface roughness (Ra) of the glass-ceramic substrate after polishing is within a range from 1 .ANG. to 5 .ANG..
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Group Karl
Kabushiki Kaisha Ohara
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