Glass for rigid disk substrates

Details Glass for rigid disk substrates Glass for rigid disk substrates

1999-01-26

2000-12-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 73, 501 77, 501 78, C03C 3062, C03C 3064, C03C 3068, C03C 3085

Patent

active

061627518

ABSTRACT:
The glasses used for making rigid disk substrates have the following composition (based on the % by weight of the oxides): SiO.sub.2, 40 to 60; Al.sub.2 O.sub.3, 5 to 20; B.sub.2 O.sub.3, 0 to 5; Li.sub.2 O, 0 to 10; Na.sub.2 O, 0 to 12, with the proviso that Li.sub.2 O+Na.sub.2 O 5 to 12; K.sub.2 O, 0 to 5; MgO, 0 to 20; CaO, 0 to 6, with the proviso that MgO+CaO, 4 to 20,SrO+BaO, 0 to 10; Zr.sub.2 O, 0 to 5; TiO.sub.2, 0 to 5; CeO.sub.2, 0 to 1; La.sub.2 O.sub.3, 0 to 10; Fe.sub.2 O.sub.3, 0 to 10; Nb.sub.2 O.sub.5, 0 to 10; V.sub.2 O.sub.5, 0 to 15, with the proviso that TiO.sub.2 +ZrO.sub.2 +La.sub.2 O.sub.3 +Fe.sub.2 O.sub.3 +Nb.sub.2 O.sub.3 +V.sub.2 O.sub.5 .gtoreq.8, As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +F, 0.1 to 1; or, SiO.sub.2, 10 to 30; Al.sub.2 O.sub.3, 0 to 5; B.sub.2 O.sub.3, 0 to 8; Li.sub.2 O, 0 to 8; Na.sub.2 O, 1 to 10, with the proviso that Li.sub.2 O+Na.sub.2 O, 5 to 10; K.sub.2 O, 0 to 3; MgO, 0 to 12; CaO, 0 to 15, with the proviso that MgO+CaO,10 to 15, SrO+BaO, 0 to 8; Zr.sub.2 O, 0 to 8; TiO.sub.2, 10 to 25; La.sub.2 O.sub.3, 0 to 10; Nb.sub.2 O.sub.5, 10 to 18; V.sub.2 O.sub.5, 0 to 20; CeO.sub.2, 0 to 1; As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +F, 0.1 to 1. Both types or groups of glasses fulfill the following inequality formulae (1):

REFERENCES:
patent: 4128432 (1978-12-01), Komorita et al.
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4742028 (1988-05-01), Boudot et al.
patent: 5264272 (1993-11-01), Tanabe et al.
Idema International Disk Drive Equipment and Materials Association: Alternative Substrates III, "The Alternate Alternative Substrate---Chemically Strengthened Aluminum", D. J. Perettie et al, Sep. 5, 1995, San Jose, California, pp. 55-60.

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