Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1997-12-19
1999-02-16
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 4, 428694ST, C03C 1004
Patent
active
058720693
ABSTRACT:
A novel Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 series glass-ceramics for magnetic disc substrate use, which can prevent deformation of the substrate at a large temperature change and provide a strong, small and compact magnetic disc substrate without trouble and much reading and/or writing informations on the smoothened surface of the substrate, is provided. The glass-ceramics has a main crystal phase of lithium disilicate (Li.sub.2 O.2SiO.sub.2) phase, the peak intensity I of cristobalite phase (CRI) of at least 20 but not more than 50 when the peak intensity of I of lithium disilicate (L2S) phase measured by an X-ray diffraction analysis is taken as 100, and containing 1.0-3.0 parts by weight of Cr.sub.2 O.sub.3 and 1.0-3.0 parts by weight of MnO when the sum of metal oxides other than Cr.sub.2 O.sub.3 and MnO is taken as 100 parts by weight.
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patent: 5580363 (1996-12-01), Goto et al.
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Group Karl
NGK Insulators, Inc.
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