Glass substrate for magnetic disk

Details Glass substrate for magnetic disk Glass substrate for magnetic disk

1996-04-18

1999-05-04

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 643, 428 644, 428 653, 428694ST, 428410, 428426, 501 55, 501 68, 501 69, 501 70, 501 72, G11B 582

Patent

active

059002964

ABSTRACT:
A glass substrate for magnetic disks, obtained by chemical strengthening treatment of a glass consisting essentially of from 50 to 65 wt % of SiO.sub.2, from 5 to 15 wt % of Al.sub.2 O.sub.3, from 2 to 7 wt % of Na.sub.2 O, from 4 to 9 wt % of K.sub.2 O, from 7 to 14 wt % of Na.sub.2 O+K.sub.2 O, from 12 to 25 wt % of MgO+CaO+SrO+BaO, and from 1 to 6 wt % of ZrO.sub.2.

REFERENCES:
patent: 3900329 (1975-08-01), Grubb et al.
patent: 4015045 (1977-03-01), Rinehart
patent: 4053679 (1977-10-01), Rinehart
patent: 4833001 (1989-05-01), Kijima et al.
patent: 5091345 (1992-02-01), Becker
patent: 5292690 (1994-03-01), Kawachi et al.
patent: 5405646 (1995-04-01), Nanis
patent: 5599754 (1997-02-01), Maeda et al.
Database WPI, Derwent Publications, AN 74-81856V/47, JP-A-74 039897, Oct. 29, 1974.

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