Ion exchange processes and chemically strengthened glass substrates resulting therefrom
A method of performing ion exchange of a thin, flexible glass substrate having an average thickness equal to or less than about 0.3 mm to chemically strengthen the glass substrate is disclosed. The chemically strengthened glass substrate comprises a first compressive stress layer having a first depth of layer, and a second compressive stress layer having a second depth of layer, the first and second stress layers being separated by a layer of tensile stress. A laminated article comprising the chemically strengthened glass substrate is also described.
1. A glass article comprising:
a glass substrate including a first ion-exchanged surface and a second ion-exchanged surface opposite the first ion-exchanged surface, the first and second ion-exchanged surfaces defining an average thickness therebetween;
a first compressive stress layer extending inward from the first ion-exchanged surface toward a center of the glass substrate comprising a first depth of layer DOL 1 , wherein DOL 1 is greater than 25% of the average thickness of the glass substrate;
a second compressive stress layer extending inward from the second ion-exchanged surface toward the center of the glass substrate comprising a second depth of layer DOL 2 less than DOL 1 ; and
a second substrate is bonded to the first ion-exchanged surface.
2. The glass article according to claim 1 , wherein the compressive stress at the first ion-exchanged surface of the glass substrate is at least 500 MPa.
3. The glass article according to claim 1 , wherein the compressive stress at the first ion-exchanged surface of the glass substrate is at least 950 MPa.
4. The glass article according to claim 1 , wherein the compressive stress at the second ion-exchanged surface of the glass substrate is at least 850 MPa.
5. The glass article according to claim 1 , wherein DOL 1 is equal to or greater than 10 μm.
6. The glass article according to claim 1 , wherein DOL 2 is equal to or greater than 25% of the average thickness of the glass substrate.
7. The glass article of claim 1 , wherein the second substrate comprises metal.
8. The glass article of claim 1 , wherein the second substrate comprises a polymer.
9. The glass article of claim 1 , wherein an adhesive layer bonds the second substrate to the first ion-exchanged surface.
10. The glass article of claim 1 , wherein the glass substrate is planar.
11. The glass article of claim 1 , wherein the glass substrate is curved.
12. The glass article of claim 11 , wherein the glass substrate comprises a complex curvature shape.
13. The glass article of claim 1 , wherein the second substrate comprises a layer.
14. The glass article of claim 13 , wherein the layer of the second substrate comprises a polymer film.
15. The glass article of claim 13 , wherein the layer of the second substrate comprises a polymer coating.
16. The glass article of claim 13 , wherein the layer of the second substrate comprises a metal foil.
17. The glass article of claim 13 , wherein the average thickness of the glass substrate is not less than a thickness of the layer of the second substrate.