Ultra-thin, non-frangible glass and methods of making

1. A glass article, the glass article having a thickness t, wherein 0.2 mm≤t<0.4 mm, a compressive layer extending from a surface of the glass article to a depth of compression DOC and a tensile region extending from the depth of compression to a center region of the glass article, the tensile region under a physical center tension CT, wherein CT>|−1.956×10 −16 ×t 6 +1.24274×10 −12 ×t 5 −3.09196×10 −9 ×t 4 +3.80391×10 −6 ×t 3 −2.35207×10 −3 ×t 2 +5.96241×10 −1 ×t+36.59941, where t is expressed in microns, and where CT is expressed in MPa, the glass article (i) being non-frangible, (ii) lithium free, (iii) comprising an alkali aluminosilicate glass comprising 0% B 2 O 3 , and (iv) comprising a depth of layer (DOL) in a range from about 0.3t to about 0.44t.

2. The glass article of claim 1 , wherein 0.05t≤DOC≤0.22t.

3. The glass article of claim 1 , wherein the compressive layer has a compressive stress CS1 at the surface, and wherein 200 MPa≤CS1≤950 MPa.

4. The glass article of claim 1 , wherein the glass article is ion exchanged.

5. The glass article of claim 1 , wherein the compressive layer has a stress profile, wherein at least a portion of the stress profile is linear and has a slope m1, and wherein 200 MPa/μm≥|m1|≥MPa/μm.

6. The glass article of claim 5 , wherein 20 MPa/μm≥|m1|≥1.2 MPa/μm.

7. The glass article of claim 1 , wherein the compressive layer has a stress profile comprising: (i) a first region extending from at least a first depth D 1 to the depth of compression DOC, wherein at least a portion of the first region is linear and has a slope m1, wherein 20 MPa/μm≥|m1|≥1.2 MPa/μm and where 9 μm≤D 1 ≤17 μm; and (ii) a second region extending from the surface to a depth of up to the first depth D 1 , the second region having a linear portion extending from the surface to a depth of up to about 5 μm or less and having a slope m2, wherein 200 MPa/μm≥|m2|≥30 MPa/μm.

8. The glass article of claim 7 , wherein 160 MPa/μm≥|m2|≥40 MPa/μm.

9. The glass article of claim 1 , wherein the glass article comprises a concentration profile of K + that reaches a center of the glass article at t/2.

10. The glass article of claim 9 , wherein the alkali aluminosilicate glass comprises P 2 O 5 .

11. The glass article of claim 1 , wherein the physical center tension CT is less than or equal to about 200 MPa.

12. The glass article of claim 11 , wherein the center tension CT is less than or equal to about 135 MPa.

13. The glass article of claim 1 , wherein DOC>0.15t, wherein CT (MPa)≤(85/√t (mm)).

14. The glass article of claim 13 , wherein 0.18t<DOC<0.22t, wherein CT (MPa)≤(79/√t (mm)).

15. A consumer electronic product, comprising:

a housing having a front surface, a back surface and side surfaces;

electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and

the glass article of claim 1 disposed over the display.

16. A glass article, the glass article being non-frangible and having a thickness t, wherein 0.1 mm≤t<0.4 mm, and the glass article comprising:

a. a compressive layer extending from a surface of the glass article to a depth of compression DOC, the compressive layer having a stress profile, the stress profile comprising:

i. a first region extending from at least a first depth D 1 to the depth of compression DOC, wherein at least a portion of the first region is linear and has a slope m1, wherein 20 MPa/μm≥|m1|≥1.2 MPa/μm and where 9 μm≤D 1 ≤17 μm; and

ii. a second region extending from the surface to a depth of up to the first depth D 1 , the second region having a linear portion extending from the surface to a depth of up to about 5 μm or less and having a slope m2, wherein 200 MPa/μm≥|m2|≥30 MPa/μm; and

b. a tensile region extending from the depth of compression to a center region of the glass article, the tensile region under a physical center tension CT, wherein CT>|−1.956×10 −16 ×t 6 +1.24274×10 −12 ×t 5 −3.09196×10 −9 ×t 4 +3.80391×10 −6 ×t 3 −2.35207×10 −3 ×t 2 +5.96241×10 −1 ×t+36.59941, where t is expressed in microns, and where CT is expressed in MPa; and

c. comprising an alkali aluminosilicate glass comprising 0% B 2 O 3 and a depth of layer (DOL) in a range from about 0.3t to about 0.44t.

17. The glass article of claim 16 , wherein 0.08t≤DOC≤0.22t.

18. The glass article of claim 16 , wherein the compressive layer has a compressive stress CS at the surface, and wherein 200 MPa≤CS≤950 MPa.

19. The glass article of claim 16 , wherein the glass article is ion exchanged.

20. The glass article of claim 16 , wherein the glass article comprises a concentration profile of K + that reaches a center of the glass article at t/2.

21. The glass article of claim 20 , wherein the glass is lithium-free.

22. The glass article of claim 20 , wherein the alkali aluminosilicate glass comprises P 2 O 5 .

23. The glass article of claim 16 , wherein the center tension CT is less than or equal to about 200 MPa.

24. The glass article of claim 16 , wherein the center tension CT is in the range of 135 MPa to 200 MPa, and the thickness t is in the range of 100 μm to 200 μm.

25. The glass article of claim 16 , wherein DOC>0.15t, wherein CT (MPa)≤(85/√t (mm)).

26. The glass article of claim 25 , wherein 0.18t<DOC<0.22t, wherein CT (MPa)≤(79/√t (mm)).

27. The glass article of claim 16 , wherein the center tension CT is in the range of 96.7 MPa to 200 MPa, and the thickness t is in the range of 100 μm to 300 μm.

28. A consumer electronic product, comprising:

a housing having a front surface, a back surface and side surfaces;

electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and

the glass article of claim 16 disposed over the display.