Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1998-04-23
2000-09-19
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694SG, 428900, G11B 566
Patent
active
061209228
ABSTRACT:
A glass-ceramic substrate for a magnetic information storage medium includes, as predominant crystal phases, lithium disilicate (Li.sub.2 O.2SiO.sub.2) and at least one selected from a group consisting of .alpha.-quartz (.alpha.-SiO.sub.2), .alpha.-quartz solid solution (.alpha.-SiO.sub.2 solid solution), .alpha.-cristobalite (.alpha.-SiO.sub.2) and .alpha.-cristobalite solid solution (.alpha.-SiO.sub.2 solid solution) and has a coefficient of thermal expansion of +65 to +130.times.10.sup.-7 /.degree. C. at a temperature within a range from -50.degree. C. to +70.degree. C. and surface roughness (Ra) after polishing of 3 .ANG.-9 .ANG..
REFERENCES:
patent: 4480044 (1984-10-01), McAlinn
patent: 5494721 (1996-02-01), Nakagawa
patent: 5567217 (1996-10-01), Goto
European Search Report, The Hague, Dec. 8, 1999, Examiner Magrizos, S.
JP Appln. No. 6-329440 (with English language Abstract) Nov. 29, 1994.
JP Appln. No. 7-157331 (with English language Abstract) Jun. 20, 1995.
JP Appln. No. 8-221747 (with English language Abstract) Aug. 30, 1996.
JP Appln. No. 9-208260 (with English language Abstract) Aug. 12, 1997.
JP Appln. No. 10-45426 (with English language Abstract) Feb. 17, 1998.
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