Glass-based articles having improved fracture performance
Glass-based articles article are described and have a first surface and a second surface opposing the first surface defining a thickness (t) (mm); and a compressive stress (CS) layer containing ion-exchanged potassium and ion-exchanged silver or ion-exchanged potassium and ion-exchanged copper, the CS layer extending from the first surface to a depth of compress (DOC), wherein the DOC is in a range of 0.1·t and 0.3·t, the CS at the first surface in a range of 300 MPa and 1500 MPa and defining a compressive stress profile including a spike region, a tail region and a knee region between the spike region and the tail region, wherein all points of the stress profile in the spike region comprise a tangent having a value that is in a range of −15 MPa/micrometer and −200 MPa/micrometer and all points in the tail region comprise a tangent having a value that is in a range of −0.01 MPa/micrometer and −3 MPa/micrometer.
1. A glass-based article comprising:
a first surface and a second surface opposing the first surface defining a thickness (t); and
a compressive stress (CS) layer containing (i) ion-exchanged potassium and ion-exchanged silver or (ii) ion-exchanged potassium and ion-exchanged copper, the CS layer defining a stress profile and extending from the first surface to a depth of compress (DOC), wherein the DOC is in a range from 0.1·t to 0.3·t, the CS at the first surface in a range from 300 MPa to 1500 MPa and defining a compressive stress profile including a spike region, a tail region and a knee region between the spike region and the tail region, wherein all points of the stress profile in the spike region comprise a tangent having a value that is in a range from −200 MPa/micrometer to −15 MPa/micrometer and all points in the tail region comprise a tangent having a value that is in a range from −3 MPa/micrometer to −0.01 MPa/micrometer, wherein there is a compressive stress in the tail region of greater than 50 MPa at 0.1·t.
2. The glass-based article of claim 1 , wherein the CS layer contains ion-exchanged silver, ion-exchanged potassium and ion-exchanged sodium.
3. The glass-based article of claim 1 , wherein the glass-based article contains Li 2 O.
4. The glass-based article of claim 1 , wherein Li 2 O is present in the glass-based article in a range from 0.1 mol % to 20 mol %.
5. The glass-based article of claim 1 , wherein B 2 O 3 is present in the glass-based article in a range from 0.1 mol % to 10 mol %.
6. The glass-based article of claim 1 , wherein P 2 O 5 is present in the glass-based article in a range from 0.1 mol % to 10 mol %.
7. The glass-based article of claim 1 , wherein the glass-based article is free of K 2 O.
8. The glass-based article of claim 1 , wherein the compressive stress (CS) at the first surface is in a range from 450 MPa to 1200 MPa.
9. The glass-based article of claim 1 , wherein the surface compressive stress (CS) is in a range from 600 MPa to 1200 MPa.
10. The glass-based article of claim 1 , wherein all points of the stress profile in the spike region comprise a tangent having a value that is in a range from −200 MPa/micrometer to −45 MPa/micrometer and all points in the tail region comprise a tangent having a value that is in a range from −2 MPa/micrometer to −0.01 MPa/micrometer.
11. The glass-based article of claim 1 , wherein all points of the stress profile in the spike region comprise a tangent having a value that is in a range from −200 MPa/micrometer to −75 MPa/micrometer and all points in the tail region comprise a tangent having a value that is in a range from −1 MPa/micrometer to −0.01 MPa/micrometer.
12. The glass-based article of claim 1 , wherein there is a compressive stress in the tail region of greater than 80 MPa at 0.1·t.
13. The glass-based article of claim 1 , wherein all points of the stress profile in the tail region form a power-law profile having a power exponent, wherein the power exponent is in a range from about 1.2 to 3.4.
14. The glass-based article of claim 1 , wherein t is in a range from about 0.1 millimeters to 3 millimeters.
15. The glass-based article of claim 1 , wherein t is in a range from about 0.1 millimeters to 2 millimeters.
16. The glass-based article of claim 13 , wherein the power exponent is in a range from about 1.3 to 2.8.
17. The glass-based article of claim 1 , further exhibiting CIELAB color space coordinates, under a CIE illuminant F02, of L* values of about 90 and greater, a* values in a range from about −0.10 to about 0, and b* values in a range from about −0.10 to about 0.
18. The glass-based article of claim 1 , further exhibiting an antimicrobial efficacy for E. coli of greater than 2 log kill.
19. The glass-based article of claim 1 , further comprising a coating on the first surface.
20. The glass based article according to claim 19 , wherein the coating comprises a scratch-resistant coating.
21. The glass-based article according to claim 19 , wherein the coating comprises an easy-to-clean coating.
22. A device comprising:
a housing having front, back, and side surfaces;
electrical components that are at least partially inside the housing;
a display at or adjacent to the front surface of the housing; and
a cover substrate disposed over the display, wherein at least a portion of the housing or the cover substrate comprises the glass-based article of claim 1 .