HIGH STRENGTH, SCRATCH RESISTANT AND TRANSPARENT GLASS-BASED MATERIALS

• US 20160280589A1
• Filed: 03/22/2016
• Published: 09/29/2016
• Est. Priority Date: 03/24/2015
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Beall, George Halsey, Comte, Marie Jacqueline Monique, Marques, Paulo Gaspar Jorge
• Granted Patent: US 11,267,747 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C03C 10/0009 containing silica as main constituent
• CPC Class Codes: C03C 10/0045 containing SiO2, Al2O3 and MgO as main constituents
• CPC Class Codes: C03C 10/0054 containing PbO, SnO2, B2O3
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 3/085 containing an oxide of a divalent metal
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: C03C 3/093 containing zinc or zirconium
• CPC Class Codes: C03C 4/0092 for glass with improved high visible transmittance, e.g. extra-clear glass

Abstract

Embodiments of a transparent glass-based material comprising a glass phase and a second phase that is different from and is dispersed in the glass phase are provided. The second phase may comprise a crystalline or a nanocrystalline phase, a fiber, and/or glass particles. In some embodiments, the second phase is crystalline. In one or more embodiments, the glass-based material has a transmittance of at least about 88% over a visible spectrum ranging from about 400 nm to about 700 nm and a fracture toughness of at least about 0.9 MPa·m^1/2, and wherein a surface of the glass-based material, when scratched with a Knoop diamond at a load of at least 5 N to form a scratch having a width w, is free of chips having a size of greater than 3w.

Claims

1. A glass-based material, the glass-based material comprising a glass phase and a second phase that is different than the glass phase and dispersed within the glass phase, wherein the glass-based material has a transmittance of at least about 88% over a visible spectrum ranging from about 400 nm to about 700 nm and a fracture toughness of at least about 0.9 MPa·

m^1/2, and wherein a surface of the glass-based material, when scratched with a Knoop diamond at a load of at least 5 N to form a scratch having a width w, is free of chips having a size of greater than 3w.

2. The glass-based material of claim 1, wherein the second phase is a crystalline ceramic phase and wherein the crystalline phase comprises any one or more of:

crystals having a mean crystalline size in a range from 5 nm to 200 nm, as determined from x-ray diffraction/Rietveld analysis;

up to 98 volume % of the glass-based materials.

at least one of mullite, spinel, β

-quartz, petalite, lithium dissilicate, β

-spodumene, nepheline, and alumina.

3. The glass-based material of claim 2, further comprising a second crystalline phase, the second crystalline phase comprising nepheline or anorthite.

4. The glass-based material of claim 1, wherein the glass phase comprises at least one of a soda lime glass, an alkali aluminosilicate glass, and a lithium alumina silicate glass.

5. The glass-based material of claim 1, wherein the second phase comprises at least one of nanocrystals, fibers, and amorphous particles.

6. The glass-based material of claim 5, wherein a difference in refractive index between the glass phase and the second phase is less than about 0.025.

7. The glass-based material of claim 1, wherein the glass-based material is ion exchanged and has a retained strength after abrasion of at least about 250 MPa as measured by abraded ring-on-ring testing.

8. The glass-based material of claim 1, wherein the glass-based material has a coefficient of thermal expansion of less than about 45×

10⁷ K<sup>−

1</sup>.

9. The glass-based material of claim 1, wherein the glass-based material has a Young'"'"'s modulus in a range from about 80 GPa to about 100 GPa.

10. The glass-based material of claim 1, wherein the glass-based material has a thickness in a range from about 0.1 mm to about 2 mm, and wherein the glass-based material has at least about a 60% survival rate when dropped in an inverted ball drop test from a height of about 80 cm onto an abrasive material.

11. A glass-based material comprising a glass phase and a second phase that is different than the glass phase and dispersed within the glass phase, the glass-based material having a transmission of at least 88%/mm over a visible spectrum ranging from about 400 nm to about 700 nm and a fracture toughness of at least about 0.9 MPa·

m^1/2, wherein;

a. the second phase comprises particles having a mean size in a range from 5 nm to 200 nm;

b. the glass phase has a first index of refraction and the second phase has a second index of refraction, wherein the difference between the first index of refraction and the second index of refraction is less than about 0.025; and

c. a volume fraction of the second phase in the glass-based material is in a range from 10 to about 98%.

12. The glass-based material of claim 11, wherein the second phase is a crystalline ceramic phase.

13. The glass-based material of claim 12, wherein the crystalline phase comprises crystals having a mean crystalline size in a range from 5 nm to 200 nm, as determined from x-ray diffraction/Rietveld analysis.

14. The glass-based material of claim 12, wherein the crystalline phase comprises at least one of mullite, spinel, β

-spodumene, nepheline, and alumina.

15. The glass-based material of claim 11, further comprising a second crystalline phase, the second crystalline phase comprising nepheline or anorthite.

16. The glass-based material of claim 11, wherein the glass phase comprises at least one of a soda lime glass, an alkali aluminosilicate glass, and a lithium alumina silicate glass.

17. The glass-based material of claim 11, wherein the second phase comprises at least one of nanocrystals, fibers, and amorphous particles.

18. A glass-based material comprising a glass phase and a second phase that is different than the glass phase and dispersed within the glass phase, the glass-based material having a transmission of at least 88%/mm over a visible spectrum ranging from about 400 nm to about 700 nm, a fracture toughness of at least about 0.9 MPa·

m^1/2, a coefficient of thermal expansion of less than about 45×

10⁷ K<sup>−

1</sup>, and a Young'"'"'s modulus in a range from about 80 GPa to about 100 GPa.

19. The glass-based material of claim 18, wherein a difference in refractive index between the glass phase and the second phase is less than about 0.025.

20. The glass-based material of claim 18, wherein the glass-based material is ion exchanged and has a retained strength after abrasion of at least about 250 MPa as measured by abraded ring-on-ring testing.

21. The glass-based material of claim 18, wherein the glass-based material has a thickness in a range from about 0.1 mm to about 2 mm, and wherein the glass-based material has at least about a 60% survival rate when dropped in an inverted ball drop test from a height of about 80 cm onto an abrasive material.

22. The glass-based material of claim 18, wherein a surface of the glass-based material, when scratched with a Knoop diamond at a load of at least 5 N to form a scratch having a width w, is free of chips having a size of greater than 3w.