Chemically prestressable aluminosilicate glass and products made

Details Chemically prestressable aluminosilicate glass and products made Chemically prestressable aluminosilicate glass and products made

1997-04-25

1999-04-20

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 64, 501 69, 428694ST, C03C 3095, C03C 3112

Patent

active

058957685

ABSTRACT:
The chemically prestressable glass having a low bubble count and bubble size has the following composition in mol %, based on a total amount of oxides present, SiO.sub.2 from 63.0 to 67.5 mol %, Al.sub.2 O.sub.3 from 9.5 to 12.0 mol %, Na.sub.2 O from 8.5 to 15.5 mol %, K.sub.2 O from 2.5 to 4.0 mol %, MgO from 3.0 to 9.0 mol %, sum of CaO+SrO+BaO+ZnO from 0 to 2.5 mol %, TiO.sub.2 from 0.5 to 1.5 mol %, CeO.sub.2 from 0.02 to 0.5 mol %, As.sub.2 O.sub.3 from 0.02 to 0.35 mol %, SnO.sub.2 from 0. to 1.0 mol +CeO.sub.2 ! is 7.6 to 18.5, but, when arsenic-free, SnO.sub.2 is from 0.02 to 1.0 mol % and F.sub.2 is from greater than 0.5 to 2.6 mol %. The invention also includes a safety glass and a hard disk for information storage made from this chemically prestressable glass.

REFERENCES:
patent: 4687751 (1987-08-01), Barlier et al.
patent: 5213440 (1993-05-01), Yeh et al.
patent: 5459110 (1995-10-01), Brix
patent: 5656558 (1997-08-01), Brix et al.

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