Compressively stressed laminated glass article via photosensitive glass and method of making the article

• US 10,202,303 B2
• Filed: 10/04/2013
• Issued: 02/12/2019
• Est. Priority Date: 10/04/2012
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Boek, Heather Debra, Borrelli, Nicholas Francis
• Primary Examiner(s): Colgan, Lauren R
• Application Number:
  US14/432,560
• Publication Number:
  US 20150291468A1
• Time in Patent Office: 1,957 Days
• Field of Search: 428426, 428432, 428434, 428428
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: C03B 17/02 Forming molten glass coated with coloured layers; Forming molten glass of different compositions or layers; Forming molten glass comprising reinforcements or inserts
• CPC Class Codes: C03B 17/064 by the overflow downdraw fusion process; Isopipes therefor
• CPC Class Codes: C03C 10/00 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 Class Codes: C03C 10/0009 containing silica as main constituent
• CPC Class Codes: C03C 10/0027 containing SiO2, Al2O3, Li2O as main constituents
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 4/04 for photosensitive glass

Abstract

Laminated articles comprised of glass core and clad layers, more specifically, to compressively stressed laminated articles comprising a glass core sandwiched between first and second clad layers, the clad layers being formed from photosensitive glass.

Claims

1. A laminated article comprising:

a glass core layer disposed between a first glass cladding layer and a second glass cladding layer;

wherein the glass core layer has a composition which is different from the composition of the first and second glass cladding layers; and

wherein at least one of the first glass cladding layer or the second glass cladding layer comprises from about 70.0 mol. % to about 77.0 mol. % SiO₂;

from about 2.5 mol. % to about 5.0 mol. % Al₂O₃; and

from about 12.0 mol. % to about 18.0 mol. % Li₂O.

2. The laminated article of claim 1 wherein at least one of the first glass cladding layer or the second glass cladding layer further comprises from about 1.0 mol. % to about 3.0 mol. % Na₂O.

3. The laminated article of claim 1 wherein at least one of the first glass cladding layer or the second glass cladding layer further comprises from about 1.0 mol. % to about 5.0 mol. % K₂O.

4. The laminated article of claim 1 wherein at least one of the first glass cladding layer or the second glass cladding layer further comprises from about 0 mol. % to about 2.5 mol. % BaO.

5. The laminated article of claim 1 wherein at least one of the first glass cladding layer or the second glass cladding layer further comprises from about 0.1 mol. % to about 1.3 mol. % K₂O.

6. The laminated article of claim 1 wherein at least one of the first glass cladding layer or the second glass cladding layer comprises beta-spodumene.

7. The laminated article of claim 1, wherein the composition of the core layer is a non-photosensitive glass composition.

8. The laminated article of claim 1, wherein at least one of the first glass cladding layer or the second glass cladding layer comprises lithium silicate crystals.

9. The laminated article of claim 8, wherein the lithium silicate crystals are lithium metasilicate (Li₂SiO₃), lithium disilicate (Li₂Si₂O₅), or a combination thereof.

10. The laminated article of claim 1, wherein at least one of the first glass cladding layer or the second glass cladding layer comprises a coefficient of thermal expansion of about 70×

10<sup>−

7</sup>/°

C. to about 80×

10<sup>−

7</sup>/°

C.

11. The laminated article of claim 10, wherein the coefficient of thermal expansion of the at least one of the first glass cladding layer or the second glass cladding layer is within about 5×

10<sup>−

7</sup>/°

C. of a coefficient of thermal expansion of the glass core layer.

12. The laminated article of claim 1, wherein at least one of the first glass cladding layer or the second glass cladding layer comprises a liquidus viscosity of about 20 kP to about 220 kP.

13. The laminated article of claim 1, wherein the glass core layer comprises K₂O in a higher concentration than the at least one of the first glass cladding layer or the second glass cladding layer.

14. The laminated article of claim 1, wherein Li in at least one of the first glass cladding layer or the second glass cladding layer has been exchanged with at least one of Na or K in the glass core layer.

15. A use of the laminated article of claim 1 for cover glass or glass backplane applications in consumer or commercial electronic devices, for touch screen or touch sensor applications, for portable electronic devices, for photovoltaic applications, for architectural glass applications, for automotive or vehicular glass applications, or for commercial or household appliance applications.