Glass with high surface strength

Patent metadata

Field	Value
Publication number	US-2016376186-A1
Application number	US-201615191913-A
Country	US
Kind code	A1
Filing date	Jun 24, 2016
Priority date	Jun 26, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

Embodiments of alkali aluminosilicate glass articles that may be chemically strengthened to achieve a maximum surface compressive stress that exceeds compressive stresses that have been achieved in similar glasses are disclosed. In one or more embodiments, the fictive temperature of these glass articles may be equal to the 10 11 poise (P) viscosity temperature of the glass article. In some embodiments, the strengthened alkali aluminosilicate glass articles described herein may exhibit a maximum compressive stress of at least about 400 MPa, 800 MPa, 930 MPa or 1050 MPa. In some embodiments, the strengthened alkali aluminosilicate glass articles described herein may exhibit a compressive stress layer extending to a depth of layer of at least about 40 μm (in samples having a thickness of 1 mm). In still other embodiments, these strengthened alkali aluminosilicate glass articles exhibit a parabolic or near-parabolic tensile stress profile in the central region of the glass articles.

First claim

1 . An alkali aluminosilicate glass article comprising: a compressive stress layer extending from a surface of the alkali aluminosilicate glass to a depth of layer (DOL), the compressive stress layer having a maximum compressive stress of at least 400 MPa at the surface, wherein the alkali aluminosilicate glass article comprises at least about 58 mol % SiO 2 , from about 0.5 mol % to about 3 mol % P 2 O 5 , at least about 11 mol % Al 2 O 3 , Na 2 O and Li 2 O, wherein the ratio of the amount of Li 2 O(mol %) to Na 2 O(mol %) (Li 2 O/Na 2 O) is less than 1.0, and wherein the alkali aluminosilicate glass article is free of B 2 O 3 .

2 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a fictive temperature T f that is equal to a temperature at which the alkali aluminosilicate glass article has a viscosity of 10 11 Poise.

3 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a zircon breakdown temperature of less than about 35 kPoise.

4 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a liquidus viscosity of at least 200 kPoise.

5 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a ratio R 2 O(mol %)/Al 2 O 3 (mol %) that is less than 2, where R 2 O=Li 2 O+Na 2 O.

6 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a total amount of SiO 2 and P 2 O 5 that is greater than 65 mol % and less than 67 mol % (65 mol %<SiO 2 (mol %)+P 2 O 5 (mol %)<67 mol %).

7 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises a relationship R 2 O(mol %)+R′O(mol %)−Al 2 O 3 (mol %)+P 2 O 5 (mol %) that is greater than about −3 mol %, wherein R 2 O=the total amount of Li 2 O and Na 2 O present in the alkali aluminosilicate glass article and R′O is a total amount of divalent metal oxides present in the alkali aluminosilicate glass article.

8 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises from about 58 mol % to about 65 mol % SiO 2 ; from about 11 mol % to about 20 mol % Al 2 O 3 ; from about 6 mol % to about 18 mol % Na 2 O; from 0 mol % to about 6 mol % MgO; and from 0 mol % to about 6 mol % ZnO.

9 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises P 2 O 5 in an amount in a range from about 0.5 mol % to about 2.8 mol %.

10 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass article comprises Li 2 O in an amount up to about 10 mol %.

11 . The alkali aluminosilicate glass article of claim 1 , further comprising a thickness in a range from about 0.05 mm to about 1.5 mm.

12 . The alkali aluminosilicate glass article of claim 1 , further comprising a thickness of at least 1 mm, wherein the maximum compressive stress is at least about 1050 MPa at the surface.

13 . The alkali aluminosilicate glass article of claim 1 , further comprising a thickness of at least 1 mm, wherein the maximum compressive stress is at least about 930 MPa at the surface.

14 . The alkali aluminosilicate glass article of claim 1 , wherein the glass is chemically strengthened.

15 . The alkali aluminosilicate glass article of claim 1 , further comprising a thickness and a central region extending from the DOL to a depth equal to 0.5 times the thickness, and wherein the central region is free of K 2 O.

16 . The alkali aluminosilicate glass article of claim 1 , wherein the glass has a bend radius of less than about 37 mm at a thickness of about 1 mm.

17 . The alkali aluminosilicate glass article of claim 16 , wherein the bend radius is less than about 35 mm.

18 . The alkali aluminosilicate glass article of claim 1 , wherein the alkali aluminosilicate glass has a tensile region extending from the depth of layer into the glass article, wherein the tensile region has a maximum tensile stress of less than about 20 MPa or greater than about 40 MPa.

19 . A laminate comprising the alkali aluminosilicate glass article of claim 1 , and a second article.

20 . A consumer electronic device comprising: a housing; electrical components provided at least partially internal to the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent to a front surface of the housing; and a cover article disposed at or over the front surface of the housing and over the display, wherein the cover article comprises the alkali aluminosilicate glass article of claim 1 .

21 . An alkali aluminosilicate glass article comprising: a thickness t, a compressive stress layer extending from a surface of the alkali aluminosilicate glass to a depth of layer (DOL), and a central region comprising a maximum tensile stress,
wherein the central region extends from the DOL, and wherein the alkali aluminosilicate glass is free of B 2 O 3 and comprises at least about 58 mol % SiO 2 , from about 0.5 mol % to about 3 mol % P 2 O 5 , at least about 11 mol % Al 2 O 3 , Na 2 O and, Li 2 O, wherein the ratio of the amount of Li 2 O(mol %) to Na 2 O(mol %) (Li 2 O/Na 2 O) is less than 1.0, wherein the DOL is less than or equal to 0.25*t, and wherein the maximum tensile stress is about 35 MPa or greater.

22 . The alkali aluminosilicate glass article of claim 21 , further comprising a tensile stress profile in the central region, wherein the tensile stress profile is substantially parabolic.

23 . The alkali aluminosilicate glass article of claim 21 , wherein the alkali aluminosilicate glass article comprises a fictive temperature T f that is equal to a temperature at which the alkali aluminosilicate glass article has a viscosity of 10 11 Poise.

24 . The alkali aluminosilicate glass of claim 21 , wherein the alkali aluminosilicate glass article comprises a zircon breakdown temperature of less than about 35 kPoise.

25 . The alkali aluminosilicate glass of claim 21 , wherein the alkali aluminosilicate glass article comprises a liquidus viscosity of at least 200 kPoise.

26 . The alkali aluminosilicate glass of claim 21 , wherein the alkali aluminosilicate glass article comprises a ratio R 2 O(mol %)/Al 2 O 3 (mol %) that is less than 2, where R 2 O=Li 2 O+Na 2 O.

27 . The alkali aluminosilicate glass claim 21 , wherein the alkali aluminosilicate glass article comprises a total amount of SiO 2 and P 2 O 5 that is greater than 65 mol % and less than 67 mol % (65 mol %<SiO 2 (mol %)+P 2 O 5 (mol %)<67 mol %).

28 . The alkali aluminosilicate glass of claim 21 , wherein the alkali aluminosilicate glass article comprises a relationship R 2 O(mol %)+R′O(mol %)−Al 2 O 3 (mol %)+P 2 O 5 (mol %) that is greater than about -3 mol %, wherein R 2 O=the total amount of Li 2 O and Na 2 O present in the alkali aluminosilicate glass article and R′O is a total amount of divalent metal oxides present in the alkali aluminosilicate glass article.

29 . The alkali aluminosilicate glass of claim 21 , wherein the alkali aluminosilicate glass article comprises from about 58 mol % to about 65 mol % SiO 2 ; from about 11 mol

Assignees

• Corning Inc

Inventors

• Gross Timothy Michael

Classifications

• G06F1/1637

  Details related to the display arrangement, including those related to the mounting of the display in the housing · CPC title

• G06F1/1656

  Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories (mounting of accessories to a computer display G06F1/1607; display hoods G06F1/1603; cooling arrangements for portable computers G06F1/203) · CPC title

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• C03C3/078 Primary

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title