Fusion formable lithium aluminosilicate glass ceramic

Patent metadata

Field	Value
Publication number	US-9919953-B2
Application number	US-201615235610-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Feb 28, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A down-drawable glass ceramic. The glass ceramic has a composition which yields a liquidus viscosity that enables formation of the parent glass by down-draw techniques such as fusion-draw and slot-draw methods. The resulting glass ceramic is white or translucent in appearance with high strength achieved through heat treatment of the fusion-formed glass.

First claim

The invention claimed is:

1. A glass, the glass being cerammable and comprising from about 72 wt % to about 85 wt % SiO 2 , from about 7 wt % to about 11 wt % Al 2 O 3 , from about 4.3 wt % to about 6.5 wt % Li 2 O, and from about 4 wt % to about 9 wt % K 2 O, wherein the glass has a composition located within an area defined by a ternary eutectic of β-spodumene-lithium disilicate-tridymite in the SiO 2 —Al 2 O 3 —Li 2 O system and a binary eutectic of orthoclase-tridymite in the SiO 2 —Al 2 O 3 —K 2 O system, and wherein the ternary eutectic and binary eutectic occur at temperatures of less than about 1000° C., wherein the glass has a liquidus viscosity of at least about 100 kP, and wherein the glass comprises 0 wt % of at least one of TiO 2 and ZrO 2 .

2. The glass of claim 1 , further comprising up to 2.6 wt % Na 2 O.

3. The glass of claim 1 , further comprising up to about 5 wt % BaO.

4. The glass of claim 1 , further comprising up to about 3.0 wt % ZnO.

5. The glass of claim 1 , further comprising from about OA wt % to about 5.0 wt % P 2 O 5 .

6. A glass, the glass being cerammable and comprising from about 72 wt % to about 85 wt % SiO 2 , from about 7 wt % to about 11 wt % Al 2 O 3 , from about 4.3 wt % to about 6.5 wt % Li 2 O, from about 4 wt % to about 9 wt % K 2 O, and 0.0001 wt % to about 0.1 wt % of at least one noble metal, wherein the glass has a composition located within an area defined by a ternary eutectic of β-spodumene-lithium disilicate-tridymite in the SiO 2 —Al 2 O 3 —Li 2 O system and a binary eutectic of orthoclase-tridymite in the SiO 2 —Al 2 O 3 —K 2 O system, and wherein the ternary eutectic and binary eutectic occur at temperatures of less than about 1000° C., and the glass has a liquidus viscosity of at least about 100 kP.

7. The glass of claim 6 , wherein the at least one noble metal comprises silver.

8. The glass of claim 1 , wherein the glass has a liquidus viscosity of at least about 120 kpoise.

9. The glass of claim 8 , wherein the glass has a liquidus viscosity of at least about 150 kpoise.

10. The glass of claim 6 , further comprising up to 2.6 wt % Na 2 O.

11. The glass of claim 6 , further comprising up to about 5 wt % BaO.

12. The glass of claim 6 , further comprising up to about 3.0 wt % ZnO.

13. The glass of claim 6 , further comprising from about 0.1 wt % to about 5.0 wt % P 2 O 5 .

14. The glass of claim 6 , wherein the at least one noble metal comprises Ag, Au, Pt, Pd, or Rh.

15. The glass of claim 6 , wherein the glass has a liquidus viscosity of at least about 120 kpoise.

16. The glass of claim 15 , wherein the glass has a liquidus viscosity of at least about 150 kpoise.

17. A glass, the glass being cerammable and comprising from about 72 wt % to about 85 wt % SiO 2 , from about 7 wt % to about 11 wt % Al 2 O 3 , from about 4.3 wt % to about 6.5 wt % Li 2 O, and from about 4 wt % to about 9 wt % K 2 O, wherein the glass has a composition located within an area defined by a ternary eutectic of β-spodumene-lithium disilicate-tridymite in the SiO 2 —Al 2 O 3 —Li 2 O system and a binary eutectic of orthoclase-tridymite in the SiO 2 —Al 2 O 3 —K 2 O system, and wherein the ternary eutectic and binary eutectic occur at temperatures of less than about 1000° C., wherein the glass has a liquidus viscosity of at least about 100 kP, and wherein the glass further comprises Na 2 O.

18. The glass of claim 7 , wherein the glass further comprises at least one of 0.005 wt % to about 0.5 wt % CeO 2 , 0.005 wt % to about 0.5 wt % SnO 2 , and 0.005 wt % to about 0.5 wt % Sb 2 O 3 .

Assignees

• Corning Inc

Inventors

• Beall George Halsey
• Boek Heather Debra
• Mayolet Alexandre Michel
• Weller Mark Owen

Classifications

• C03C10/00

  Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition · CPC title

• C03B17/064

  by the overflow downdraw fusion process; Isopipes therefor · CPC title

• C03C10/0027 Primary

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• C03B17/067

  combined with thermal conditioning of the sheets · CPC title

• C03C10/0009

  containing silica as main constituent · CPC title