Aluminosilicate glasses for ion exchange

Patent metadata

Field	Value
Publication number	US-9701580-B2
Application number	US-201213408169-A
Country	US
Kind code	B2
Filing date	Feb 29, 2012
Priority date	Feb 29, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Glass compositions that may be used to produce chemically strengthened glass sheets by ion exchange. The glass compositions are chosen to promote simultaneously high compressive stress and deep depth of layer or, alternatively, to reduce the time needed to ion exchange the glass to produce a predetermined compressive stress and depth of layer.

First claim

The invention claimed is:

1. An alkali aluminosilicate glass, the alkali aluminosilicate glass having a liquidus viscosity in a range from at least 20 kiloPoise to 64 kiloPoise and comprising at least 59 mol % to about 76 mol % SiO 2 ; from 16 mol % to about 20 mol % Al 2 O 3 , 0 mol % B 2 O 3 , from 0 mol % to about 20 mol % Li 2 O; from 12.3 mol % to about 20 mol % Na 2 O; from 0 mol % to about 8 mol % K 2 O; from 0 mol % to about 10 mol % MgO; and from 0 mol % to about 10 mol % ZnO, wherein Al 2 O 3 (mol %)−Na 2 O (mol %)≧−4 mol %, wherein Al 2 O 3 is present in a tetrahedral configuration, and wherein the alkali aluminosilicate glass, when ion exchanged, has a compressive layer extending from a surface of the alkali aluminosilicate glass into the alkali aluminosilicate glass to a depth of layer, wherein the compressive layer is under a compressive stress of at least 1.1 GPa.

2. The alkali aluminosilicate glass of claim 1 , wherein 12.3 mol %≦Li 2 O+Na 2 O+K 2 O≦20 mol %.

3. The alkali aluminosilicate glass of claim 1 , wherein the alkali aluminosilicate glass comprises at least one of MgO, CaO, SrO, BaO, and ZnO.

4. The alkali aluminosilicate glass of claim 1 , wherein the alkali aluminosilicate glass is free of divalent metal oxides.

5. The alkali aluminosilicate glass of claim 1 , wherein the alkali aluminosilicate glass is ion exchanged and has a compressive layer extending from a surface of the alkali aluminosilicate glass into the alkali aluminosilicate glass to a depth of layer.

6. The alkali aluminosilicate glass of claim 5 , wherein the compressive layer is under a compressive stress of at least 1.1 GPa.

7. The alkali aluminosilicate glass of claim 5 , wherein the alkali aluminosilicate glass has a nanohardness of at least 7 GPa.

8. The alkali aluminosilicate glass of claim 1 , further comprising at least one fining agent.

9. The alkali aluminosilicate glass of claim 8 , wherein the fining agent comprises at least one of SnO 2 , As 2 O 3 , and Sb 2 O 3 .

10. The alkali aluminosilicate glass of claim 1 , wherein the alkali aluminosilicate glass is free of divalent metal oxides other than MgO and ZnO.

11. An alkali aluminosilicate glass, the alkali aluminosilicate glass being free of TiO 2 and comprising at least 59 mol % to about 76 mol % SiO 2 ; from 16 mol % to about 20 mol % Al 2 O 3 ; 0 mol % B 2 O 3 ; from 0 mol % to about 20 mol % Li 2 O; from 12.3 mol % to about 20 mol % Na 2 O; from 0 mol % to about 8 mol % K 2 O; from 0 mol % to about 10 mol % MgO; and from 0 mol % to about 10 mol % ZnO, wherein Al 2 O 3 (mol %)−Na 2 O (mol %)≧−4 mol %, wherein the alkali aluminosilicate glass has a liquidus viscosity in a range from at least 20 kiloPoise to 64 kiloPoise, and wherein the alkali aluminosilicate glass is ion exchanged and has a compressive layer extending from a surface of the alkali aluminosilicate glass into the alkali aluminosilicate glass to a depth of layer, the compressive layer being under a compressive stress of at least 1.1 GPa.

12. The alkali aluminosilicate glass of claim 11 , wherein 12.3 mol %≦Li 2 O+Na 2 O+K 2 O≦20 mol %.

13. The alkali aluminosilicate glass of claim 11 , wherein the alkali aluminosilicate glass comprises at least one of MgO, CaO, SrO, BaO, and ZnO.

14. The alkali aluminosilicate glass of claim 11 , wherein the alkali aluminosilicate glass is free of divalent metal oxides.

15. The alkali aluminosilicate glass of claim 11 , wherein the alkali aluminosilicate glass is free of divalent metal oxides other than MgO and ZnO.

Assignees

• Smedskjaer Morten Mattrup
• Potuzak Marcel
• Mauro John Christopher
• Corning Inc

Inventors

• Smedskjaer Morten Mattrup
• Potuzak Marcel
• Mauro John Christopher

Classifications

• C03C21/002 Primary

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C3/091

  containing aluminium · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title