Glasses and glass ceramics including a metal oxide concentration gradient

Patent metadata

Field	Value
Publication number	US-2016102014-A1
Application number	US-201514878429-A
Country	US
Kind code	A1
Filing date	Oct 8, 2015
Priority date	Oct 8, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

Embodiments of a glass-based article including a first surface and a second surface opposing the first surface defining a thickness (t) of about 3 millimeters or less (e.g., about 1 millimeter or less), and a stress profile, wherein all points of the stress profile between a thickness range from about 0·t up to 0.3·t and from greater than 0.7·t, comprise a tangent that is less than about −0.1 MPa/micrometers or greater than about 0.1 MPa/micrometers, are disclosed. In some embodiments, the glass-based article includes a non-zero metal oxide concentration that varies along at least a portion of the thickness (e.g., 0·t to about 0.3·t). In some embodiments, the concentration of metal oxide or alkali metal oxide decreases from the first surface to a point between the first surface and the second surface and increases from the point to the second surface. The concentration of the metal oxide may be about 0.05 mol % or greater or about 0.5 mol % or greater throughout the thickness. Methods for forming such glass-based articles are also disclosed.

First claim

1 . A glass-based article comprising:
a first surface and a second surface opposing the first surface defining a thickness (t); and a concentration of a metal oxide that is both non-zero and varies along a thickness range from about 0·t to about 0.3·t, wherein, when the glass-based article is fractured, the glass-based article fractures into at least 2 fragments/inch 2 .

2 . The glass-based article of claim 1 , wherein the concentration of the metal oxide is non-zero and varies along the entire thickness.

3 . The glass-based article of claim 1 , wherein the metal oxide generates a stress along the thickness range.

4 . The glass-based article of claim 1 , wherein the concentration of the metal oxide decreases from the first surface to a point between the first surface and the second surface and increases from the point to the second surface.

5 . The glass-based article of claim 1 , further comprising a surface compressive stress (CS) of about 300 MPa or greater.

6 . The glass-based article of claim 5 , wherein the surface CS is about 500 MPa or greater.

7 . The glass-based article of claim 1 , wherein the concentration of the metal oxide is about 0.05 mol % or greater throughout the thickness.

8 . The glass-based article of claim 1 , wherein the concentration of the metal oxide at the first surface is about 1.5 times greater than the concentration of the metal oxides at a depth equal to about 0.5·t.

9 . The glass-based article of claim 1 , wherein the glass-based article comprises a total concentration of the metal oxide in the range from about 1 mol % to about 15 mol %.

10 . The glass-based article of claim 1 , wherein the metal oxide comprises any one or more of Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O.

11 . The glass-based article of claim 1 , further comprising a surface CS of about 200 MPa or greater and a chemical depth of layer of about 0.4·t or greater.

12 . The glass-based article of claim 1 , further comprising a CS layer extending from the first surface to a DOC, wherein the DOC is about 0.1·t or greater.

13 . The glass-based article of claim 1 , further comprising a central tension (CT) region, wherein the CT region comprises the metal oxide concentration gradient.

14 . The glass-based article of claim 1 , further comprising a CT region and a surface CS, the CT region comprising a maximum CT, wherein the ratio of maximum CT to surface CS is in the range from about 0.01 to about 0.5.

15 . The glass-based article of claim 1 , wherein t comprises about 3 millimeters or less.

16 . The glass-based article of claim 1 , wherein t comprises about 1 millimeter or less.

17 . The glass-based article of claim 1 , further comprising an amorphous structure.

18 . The glass-based article of claim 1 , further comprising a crystalline structure.

19 . The glass-based article of claim 1 , further exhibiting a transmittance of about 88% or greater over a wavelength in the range from about 380 nm to about 780 nm.

20 . The glass-based article of claim 1 , further exhibiting a transmittance of about 10% or less over a wavelength in the range from about 380 nm to about 780 nm.

21 . The glass-based article of claim 1 , further exhibiting CIELAB color space coordinates, under a CIE illuminant F02, of L* values of about 88 and greater, a* values in the range from about −3 to about +3, and b* values in the range from about −6 to about +6.

22 . The glass-based article of claim 1 , further exhibiting CIELAB color space coordinates, under a CIE illuminant F02, of L* values of about 40 and less, a* values in the range from about −3 to about +3, and b* values in the range from about −6 to about +6.

23 . The glass-based article of claim 1 , further comprising:
a first surface and a second surface opposing the first surface defining a thickness (t), a first metal oxide concentration and a second metal oxide concentration, wherein the first metal oxide concentration is in the range from about 0 mol % to about 15 mol % from a first thickness range from about 0·t to about 0.5·t, and wherein the second metal oxide concentration is in the range from about 0 mol % to about 10 mol % from a second thickness range from about 0 micrometers to about 25 micrometers.

24 . The glass-based article of claim 23 , further comprising a third metal oxide.

25 . A glass-based article comprising:
a first surface and a second surface opposing the first surface defining a thickness (t) of about less than about 3 millimeters; and a stress profile extending along the thickness, wherein all points of the stress profile between a thickness range from about 0·t up to 0.3·t and from greater than 0.7·t, comprise a tangent that is less than about −0.1 MPa/micrometers or greater than about 0.1 MPa/micrometers, wherein the stress profile comprises a maximum CS, a DOC and a maximum CT, wherein the ratio of maximum CT to maximum CS is in the range from about 0.01 to about 0.5 and wherein the DOC is about 0.1·t or greater, and wherein, when the glass-based article is fractured, the glass-based article fractures into at least 2 fragments/inch 2 .

26 . The glass-based article of claim 25 , further comprising a surface CS of about 300 MPa or greater.

27 . The glass-based article of claim 26 , wherein the surface CS is about 500 MPa or greater.

28 . The glass-based article of claim 25 , further comprising a surface CS of about 200 MPa or greater and a chemical depth of layer (DOL) of about 0.4·t or greater.

29 . The glass-based article of claim 25 , further comprising a CS layer extending from the first surface to a DOC, wherein the DOC is about 0.1·t or greater.

30 . The glass-based article of claim 25 , further comprising a CT region, wherein the CT region comprises a metal oxide concentration gradient.

31 . The glass-based article of claim 26 , wherein the ratio of maximum CT to surface CS is in the range from about 0.01 to about 0.5.

32 . The glass-based article of claim 25 , wherein t comprises about 2 millimeters or less.

33 . The glass-based article of claim 25 , wherein t comprises about 1 millimeter or less.

34 . A glass-based article comprising:
a first surface and a second surface opposing the first surface defining a thickness (t); and a concentration of a metal oxide that is both non-zero and varies along a thickness range from about 0·t to about 0.3·t; and a surface CS of greater than about 200 MPa or greater.

35 . The glass-based article of claim 34 , wherein the thickness range is from about 0·t to about 0.4·t.

36 . The glass-based article of claim 34 , wherein the thickness range is from about 0·t to about 0.45·t.

37 . The glass-based article of claim 34 , wherein the metal oxide generates a stress along the thickness range.

38 . The glass-based article of claim 37 , wherein the metal oxide has a largest ionic diameter of all of the total metal oxides in the glass-based substrate.

39 . The glass-based article of claim 34 , wherein the concentration of the metal oxide decreases from the first surface to a point between the first surface and the second surface and increases from the point to the second surface.

Assignees

• Corning Inc

Inventors

• Hu Guangli
• Smith Charlene Marie
• Tang Zhongzhi
• Tietje Steven Alvin

Classifications

• C03C3/091

  containing aluminium · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C10/0027

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

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C21/002 Primary

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