Strengthened glass with ultra deep depth of compression

Patent metadata

Field	Value
Publication number	US-10640420-B2
Application number	US-201816182004-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Oct 31, 2014
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

Chemically strengthened glass articles having at least one deep compressive layer extending from a surface of the article to a depth of compression DOC of at least about 125 μm within the glass article. The compressive stress profile includes a single linear segment or portion extending from the surface to the depth of compression DOC. Alternatively, the compressive stress profile may include an additional portion extending from the surface to a relatively shallow depth and the linear portion extending from the shallow depth to the depth of compression.

First claim

The invention claimed is:

1. A glass article, the glass article comprising a thickness tin a range from 0.1 mm to 1.0 mm, and a compressive region having a compressive stress CS s , in a range from about 400 MPa to about 1200 MPa at a surface of the glass article, wherein the compressive region extends from the surface to a depth of compression DOC, wherein 0.12 ·t ≤DOC ≤ 0.22·t, and has a compressive stress profile, the compressive stress profile comprising:
a. a first portion b extending from the surface to a depth d b below the surface and having a slope m b ; and
b. a second portion c extending from about d c to the depth of compression DOC and having a slope m c , wherein −0.4 MPa/μm ≥m c ≥−3.0 MPa/μm.

2. The glass article of claim 1 , wherein the depth of compression DOC is in a range from about 95 μm to about 250 μm.

3. The glass article of claim 1 , wherein the depth of compression DOC is in a range from about 100 μm to about 190 μm.

4. The glass article of claim 1 , wherein the slope m c is in a range from about −0.7 MPa/μm to about −2.7 MPa/μm.

5. A glass article, the glass article comprising a thickness t and a compressive region having a compressive stress CS s , in a range from about 400 MPa to about 1200 MPa at a surface of the glass article, wherein the compressive region extends from the surface to a depth of compression DOC, wherein 0.1 ·t≤DOC≤0.25·t, and has a compressive stress profile, the compressive stress profile comprising:
a. a first portion b extending from the surface to a depth d b below the surface and having a slope m h ; and
b. a second portion c extending from about d c to the depth of compression DOC and having a slope m c wherein the slope m c is in a range from about −1.5 MPa/μm to about −2.7 MPa/μm.

6. The glass article of claim 1 , wherein the glass article comprises an alkali aluminosilicate glass.

7. The glass article of claim 6 , wherein the alkali aluminosilicate glass comprises up to about 10 mol % Li 2 O.

8. The glass article of claim 6 , wherein the alkali aluminosilicate glass comprises at least about 4 mol % P 2 O 5 and from 0 mol % to about 4 mol % B 2 O 3 , wherein 1.3<[(P 2 O 5 +R 2 O)/M 2 O 3 ]<2.3, where M 2 O 3 =Al 2 O 3 +B 2 O 3 , and R 2 O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.

9. The glass article of claim 6 , wherein the glass is lithium-free.

10. The glass article of claim 6 , wherein the glass consists essentially of from about 40 mol % to about 70 mol % SiO 2 ; from about 11 mol % to about 25 mol % Al 2 O 3 ; from about 4 mol % to about 15 mol % P 2 O 5 ; from about 13 mol % to about 25 mol % Na 2 O; from about 13 to about 30 mol % R x 0 , wherein R x O is the sum of the alkali metal oxides, alkaline earth metal oxides, and transition metal monoxides present in the glass; from about 11 to about 30 mol % M 2 O 3 ,where M 2 O 3 =Al 2 O 3 +B 2 O 3 ; from 0 mol % to about 1 mol % K 2 O; from 0 mol % to about 4 mol % B 2 O 3 , and 3 mol % or less of one or more of TiO 2 , MnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , ZrO 2 , Y 2 O 3 , La 2 O 3 , HfO 2 , CdO, SnO 2 , Fe 2 O 3 , CeO 2 , As 2 O 3 , Sb 2 O 3 , Cl, and Br; and 1.3<[(P 2 O 5 +R 2 O)/M 2 O 3 ]<2.3, where R 2 O is the sum of monovalent cation oxides present in the glass.

11. An electronic device comprising the glass article of claim 1 .

12. The glass article of claim 5 , wherein the depth of compression DOC is in a range from about 100 μm to about 190 μm.

13. The glass article of claim 5 , wherein 0.12·t DOCS ≤0.224·t “and the thickness is in a range from 0.1 mm to about 1.0 mm”.

14. The glass article of claim 5 , wherein the glass article comprises an alkali aluminosilicate glass.

15. The glass article of claim 14 , wherein the alkali aluminosilicate glass comprises up to about 10 mol % Li 2 O.

16. The glass article of claim 14 , wherein the alkali aluminosilicate glass comprises at least about 4 mol % P 2 O 5 and from 0 mol % to about 4 mol % B 2 O 3 , wherein 1.3<[(P 2 O 5 +R 2 O)/M 2 O 3 ]<2.3, where M 2 O 3 =Al 2 O 3 +B 2 O 3 , and R 2 O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.

17. The glass article of claim 14 , wherein the glass consists essentially of from about 40 mol % to about 70 mol % SiO 2 ; from about 11 mol % to about 25 mol % Al 2 O 3 ; from about 4 mol % to about 15 mol % P 2 O 5 ; from about 13 mol % to about 25 mol % Na 2 O; from about 13 to about 30 mol % R x O is the sum of the alkali metal oxides, alkaline earth metal oxides, and transition metal monoxides present in the glass; from about 11 to about 30 mol % M 2 O 3 ,where M 2 O 3 =Al 2 O 3 +B 2 O 3 ; from 0 mol % to about 1 mol % K 2 O; from 0 mol % to about 4 mol % B 2 O 3 , and 3 mol % or less of one or more of TiO 2 , MnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , ZrO 2 , Y 2 O 3 , La 2 O 3 , HfO 2 , CdO, SnO 2 , Fe 2 O 3 , CeO 2 , As 2 O 3 , Sb 2 O 3 , Cl, and Br; and 1.3<[(P 2 O 5 +R 2 O)/M 2 0 3 ]<2.3, where R 2 O is the sum of monovalent cation oxides present in the glass.

18. An electronic device comprising the glass article of claim 5 .

Assignees

• Corning Inc

Inventors

• Amin Jaymin
• Egboiyi Benedict Osobomen
• Pesansky Jonathan David
• Reiman Kevin Barry
• Roussev Rostislav Vatchev
• Strines Brian Paul

Classifications

• C03C21/002 Primary

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

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title