Granted Patent B2

US 12,371,367 · App. 18/796,933 · Granted Jul 29, 2025

Inventors: George Halsey Beall (Big Flats, NY); Qiang Fu (Painted Post, NY); Charlene Marie Smith (Corning, NY)

Assignee: CORNING INCORPORATED

C03C10/0027C03B32/02C03C3/097C03C4/02C03C10/0054C03C21/002C03C2204/00

Abstract

Claims (58)

1. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO 2 );

at least 7 wt % and no more than 20 wt % lithia (Li 2 O);

zero to no more than 5 wt % sodium oxide (Na 2 O);

at least 0.5 wt % and no more than 15 wt % zirconia (ZrO 2 );

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li 2 Si 2 O 5 );

wherein the lithium disilicate is a primary crystalline phase;

wherein grains in the glass-ceramic article have a length of less than 100 nm;

wherein crystals of the lithium disilicate are interlocking, thereby influencing mechanical properties of the glass-ceramic article; and

wherein the glass-ceramic article has fracture toughness of 1 MPa·m 1/2 or greater.

2. The glass-ceramic article of claim 1 , further comprising in oxide wt % at least 1 wt % and no more than 6 wt % phosphorous pentoxide (P 2 O 5 ).

3. The glass-ceramic article of claim 2 , further comprising in oxide wt % zero to no more than 4 wt % potash (K 2 O).

4. The glass-ceramic article of claim 3 , wherein a sum of the sodium oxide and the potash is zero to no more than 5 wt %.

5. The glass-ceramic article of claim 1 , wherein the glass-ceramic article comprises at least 5 wt % and no more than 30 wt % of the glass phase.

6. The glass-ceramic article of claim 1 , wherein the glass-ceramic article comprises at least 40 wt % and no more than 60 wt % of the lithium disilicate.

7. The glass-ceramic article of claim 1 , wherein the crystalline phase further comprises lithiophosphate (Li 3 PO 4 ).

8. The glass-ceramic article of claim 1 , wherein the glass-ceramic article is transparent such that average transmittance of the glass-ceramic article along a 1 mm pathlength is 85% or greater for light between 400 nm to 1000 nm.

9. The glass-ceramic article of claim 1 , wherein the glass-ceramic article comprises a thickness of less than or equal to 5 mm and at least 200 μm.

10. The glass-ceramic article of claim 1 , wherein the glass-ceramic article comprises a central tension of at least 10 MPa.

11. The glass-ceramic article of claim 1 , wherein the glass-ceramic article has fracture toughness of 1.2 MPa·m 1/2 or greater.

12. The glass-ceramic article of claim 1 , wherein the glass-ceramic article has a Vickers hardness of at least 600 kgf/mm 2 and no more than 900 kgf/mm 2 .

13. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO 2 );

at least 7 wt % and no more than 20 wt % lithia (Li 2 O);

zero to no more than 5 wt % sodium oxide (Na 2 O);

at least 0.5 wt % and no more than 15 wt % zirconia (ZrO 2 );

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li 2 Si 2 O 5 );

wherein the lithium disilicate is a primary crystalline phase;

wherein grains in the glass-ceramic article have a length of less than 100 nm;

wherein crystals of the lithium disilicate are interlocking, thereby influencing mechanical properties of the glass-ceramic article; and

wherein the glass-ceramic article has a Vickers hardness of at least 600 kgf/mm 2 and no more than 900 kgf/mm 2 .

14. The glass-ceramic article of claim 13 , wherein the glass-ceramic article is transparent such that average transmittance of the glass-ceramic article along a 1 mm pathlength is 85% or greater for light between 400 nm to 1000 nm.

15. The glass-ceramic article of claim 13 , wherein the glass-ceramic article comprises a thickness of less than or equal to 5 mm and at least 200 μm.

16. The glass-ceramic article of claim 13 , wherein the glass-ceramic article comprises a central tension of at least 10 MPa.

17. The glass-ceramic article of claim 13 , wherein the glass-ceramic article has fracture toughness of 1.2 MPa·m 1/2 or greater.

18. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO 2 );

at least 12 wt % and no more than 20 wt % lithia (Li 2 O);

at least 1 wt % and no more than 6 wt % phosphorous pentoxide (P 2 O 5 )

zero to no more than 5 wt % sodium oxide (Na 2 O);

zero to no more than 4 wt % potash (K 2 O);

at least 3 wt % and no more than 15 wt % zirconia (ZrO 2 );

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li 2 Si 2 O 5 );

wherein the lithium disilicate is a primary crystalline phase and the glass-ceramic;

wherein grains in the glass-ceramic article have a length of less than 100 nm, thereby facilitating transparency thereof;

wherein the glass-ceramic article is transparent such that average transmittance of the glass-ceramic article along a 1 mm pathlength is 85% or greater for light between 400 nm to 1000 nm.

19. The glass-ceramic article of claim 18 , wherein the glass-ceramic article comprises a central tension of at least 10 MPa.

20. The glass-ceramic article of claim 18 , wherein crystals of the lithium disilicate are interlocking, thereby influencing mechanical properties of the glass-ceramic article;

wherein the glass-ceramic article has a Vickers hardness of at least 600 kgf/mm 2 and no more than 900 kgf/mm 2 and wherein the glass-ceramic article has fracture toughness of 1 MPa·m 1/2 or greater.

Assignments (1)

Continuity (13)

References Cited (218)