IP Library › Granted Patent US 12709566
Granted Patent B2
US 12709566 · App. 18/799,044 · Granted Aug 18, 2026

Ion exchangeable glasses having high fracture toughness

Inventors: George Halsey Beall (Big Flats, NY); Qiang Fu (Painted Post, NY); Xiaoju Guo (Pittsford, NY); Peter Joseph Lezzi (Corning, NY); Zhihao Liao (Guangzhou, CN); Pascale Oram (Painted Post, NY); Charisse Marye Spier (Horseheads, NY); Alana Marie Whittier (Painted Post, NY)
Assignee: CORNING INCORPORATED
C03C3/085C03C21/002C03C2204/00
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Quick Facts
Patent No.
US 12709566
App. No.
18/799,044
Granted
Aug 18, 2026
Kind
B2
Abstract

In embodiments, a glass includes from 45 mol % to 70 mol % SiO 2 ; from 11.5 mol % to 25 mol % Al 2 O 3 ; from 2 mol % to 20 mol % Li 2 O; from greater than 0 mol % to 10 mol % Na 2 O; from 9 mol % to 19 mol % MgO; from 4 mol % ZrO 2 ; and from 0 mol % to 0.5 mol % TiO 2 . In other embodiments, a glass includes from 45 mol % to 70 mol % SiO 2 ; from 4 mol % to 25 mol % Al 2 O 3 ; from 5 mol % to 20 mol % Li 2 O; from 0.1 mol % to 10 mol % Na 2 O; from 6 mol % to 25 mol % MgO; from 0.1 mol % to 4 mol % ZrO 2 ; from 0.1 mol % to 5 mol % K 2 O; and from 0.05 mol % to 0.5 mol % SnO 2 .

Claims (52)

1 . A glass, comprising:

greater than or equal to 45 mol % to less than or equal to 70 mol % SiO 2 ;

greater than or equal to 4 mol % to less than or equal to 25 mol % Al 2 O 3 ;

greater than or equal to 5 mol % to less than or equal to 20 mol % Li 2 O;

greater than or equal to 0.1 mol % to less than or equal to 10 mol % Na 2 O;

greater than or equal to 13 mol % to less than or equal to 25 mol % MgO;

greater than or equal to 0.1 mol % to less than or equal to 4 mol % ZrO 2 ; and

greater than or equal to 0.1 mol % to less than or equal to 5 mol % K 2 O;

wherein the glass has a K IC fracture toughness greater than or equal to 0.83 MPa·m 0.5 and a Young's modulus greater than or equal to 86 GPa, and

wherein (Li 2 O+Na 2 O+MgO)/Al 2 O 3 is greater than or equal to 1.68 and less than or equal to 2.5, where each component concentration is in mol %.

2 . The glass of claim 1 , comprising:

greater than or equal to 51 mol % to less than or equal to 65 mol % SiO 2 .

3 . The glass of claim 1 , comprising:

greater than or equal to 12.0 mol % to less than or equal to 19 mol % Al 2 O 3 .

4 . The glass of claim 1 , comprising:

greater than or equal to 6 mol % to less than or equal to 12 mol % Li 2 O.

5 . The glass of claim 1 , comprising:

greater than 0.25 mol % to less than or equal to 6 mol % Na 2 O.

6 . The glass of claim 1 , comprising:

greater than or equal to 13 mol % to less than or equal to 18 mol % MgO.

7 . The glass of claim 1 , comprising:

greater than 0.25 mol % to less than or equal to 2 mol % ZrO 2 .

8 . The glass of claim 1 , comprising:

greater than or equal to 0 mol % to less than or equal to 10 mol % B 2 O 3 .

9 . The glass of claim 1 , comprising:

greater than or equal to 2 mol % to less than or equal to 7 mol % B 2 O 3 .

10 . The glass of claim 1 , comprising:

greater than or equal to 0 mol % to less than or equal to 4 mol % P 2 O 5 .

11 . The glass of claim 1 , comprising:

greater than or equal to 0 mol % to less than or equal to 3 mol % CaO.

12 . The glass of claim 1 , comprising:

greater than or equal to 0 mol % to less than or equal to 0.5 mol % TiO 2 .

13 . A glass-based article, comprising:

a compressive stress layer extending from a surface of the glass-based article to a depth of compression;

a central tension region; and

a composition at a center of the glass-based article comprising:

greater than or equal to 45 mol % to less than or equal to 70 mol % SiO 2 ;

greater than or equal to 4 mol % to less than or equal to 25 mol % Al 2 O 3 ;

greater than or equal to 5 mol % to less than or equal to 20 mol % Li 2 O;

greater than or equal to 0.1 mol % to less than or equal to 10 mol % Na 2 O;

greater than or equal to 13 mol % to less than or equal to 25 mol % MgO;

greater than or equal to 0.1 mol % to less than or equal to 4 mol % ZrO 2 ; and

greater than or equal to 0.1 mol % to less than or equal to 5 mol % K 2 O;

wherein the glass has a K IC fracture toughness greater than or equal to 0.83 MPa·m 0.5 and a Young's modulus greater than or equal to 86 GPa, and

wherein (Li 2 O+Na 2 O+MgO)/Al 2 O 3 is greater than or equal to 1.68 and less than or equal to 2.5, where each component concentration is in mol %.

14 . The glass-based article of claim 13 , wherein the compressive stress layer comprises a compressive stress greater than or equal to 400 MPa to less than or equal to 2000 MPa.

15 . The glass-based article of claim 13 , wherein the central tension region comprises a maximum central tension greater than or equal to 30 MPa to less than or equal to 300 MPa.

16 . The glass-based article of claim 13 , wherein the depth of compression is greater than or equal to 0.15 t to less than or equal to 0.25 t, where t is the thickness of the glass-based article.

17 . The glass-based article of claim 13 , wherein the compressive stress layer comprises a compressive stress spike extending from the surface of the glass-based article to a depth of compressive stress spike, and the depth of compressive stress spike is greater than or equal to 3 μm to less than or equal to 10 μm.

18 . The glass-based article of claim 13 , wherein the glass-based article has a thickness t greater than or equal to 0.2 mm to less than or equal to 2 mm.

19 . The glass-based article of claim 13 , wherein a glass having the same composition and microstructure as the composition at the center of the glass-based article has a K IC fracture toughness greater than or equal to 0.83 MPa·m 0.5 to less than or equal to 1.0 MPa·m 0.5 .

20 . The glass-based article of claim 13 , wherein a glass having the same composition and microstructure as the composition at the center of the glass-based article has a Young's modulus greater than or equal to 86 GPa to less than or equal to 100 GPa.