Crystallized glass of three-dimensional shape, chemically strengthened glass of three-dimensional shape, and method for producing crystallized glass of three-dimensional shape and chemically strengthened glass of three-dimensional shape

Patent metadata

Field	Value
Publication number	US-12240779-B2
Application number	US-202117525554-A
Country	US
Kind code	B2
Filing date	Nov 12, 2021
Priority date	Feb 27, 2018
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

The present invention provides crystallized glass of three-dimensional shape for easily producing chemically strengthened glass of three-dimensional shape that resists damage and has exceptional transparency. This crystallized glass of three-dimensional shape: contains crystals; has light transmittance in terms of a thickness of 0.8 mm of 80% or higher; and contains 45-74% SiO 2 , 1-30% Al 2 O 3 , 1-25% Li 2 O, 0-10% Na 2 O, 0-5% K 2 O, a total of 0-15% of SnO 2 and/or ZrO 2 , and 0-12% P 2 O 5 , these amounts expressing the oxide-based mass percentage.

First claim

The invention claimed is:

1. A three-dimensionally shaped crystallized glass, comprising:
a petalite crystal and a lithium disilicate crystal,
wherein the three-dimensionally shaped crystallized glass has an average transmittance of a light at a wavelength of 380 nm to 780 nm of 80% or more in terms of a thickness of 0.8 mm, the three-dimensionally shaped crystallized glass has a Young's modulus of 90 GPa or more, and the three-dimensionally shaped crystallized glass is formed by at least a bending-forming process at a bending temperature of from 700° C. to 900° C. so that a decrease of light transmittance by the bending-forming process is 3% or less.

2. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has a Young's modulus of 100 GPa or more.

3. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has an average transmittance of 85% or more.

4. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has a fracture toughness value of 0.8 MPa·m 1/2 or more.

5. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has a haze value in terms of a thickness of 0.8 mm of 1% or less.

6. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has a Vickers hardness of 680 or more.

7. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has a Vickers hardness of 700 or more.

8. The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis: from 58 to 74% of SiO 2 ; and from 4 to 11.2% of Li 2 O.

9. The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis, from 5 to 7.6% of Al 2 O 3 .

10. The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis, from 1 to 10% in total of either one or more of SnO 2 and ZrO 2 .

11. The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis, from 1 to 6% of P 2 O 5 .

12. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass is a chemically strengthened glass having a compressive stress layer on a surface thereof.

13. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass has an average thermal expansion coefficient at 50° C. to 350° C. of from 10×10 −7 /C to 30×10 −7 /° C.

14. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass is a chemically strengthened glass.

15. The three-dimensionally shaped crystallized glass according to claim 14 , wherein the three-dimensionally shaped crystallized glass has m 1 of −50 MPa/μm or less, m 2 of from −5 MPa/μm to −0.3 MPa/μm, and m 3 of from −5 MPa/μm to −0.3 MPa/μm,
wherein m 1 is an inclination of a stress profile from a surface of the crystallized glass to a depth DOL 1 , represented by the following expression (1):
m 1 =( CS - CS/ 2)/(0- DOL 1 )  (1)

where CS is a compressive stress value at the surface of the crystallized glass, DOL is a depth of the compressive stress at which the compressive stress value is zero, and DOL 1 is a depth at which the compressive stress value is CS/2,
wherein m 2 is an inclination of the stress profile from a depth DOL/4 to a depth DOL/2, represented by the following expression (2):
m 2 =( CS 1 - CS 2 )/( DOL/ 4- DOL/ 2)  (2)

where CS 1 is the compressive stress value at the depth DOL/4 from the surface of the crystallized glass, and CS 2 is the compressive stress value at the depth DOL/2 from the surface of the crystallized glass, and
wherein m 3 is an inclination of the stress profile from the depth DOL/2 to the depth DOL represented by the following expression (3):
m 3 =( CS 2 -0)/( DOL 2- DOL )  (3).

16. The three-dimensionally shaped crystallized glass according to claim 15 , wherein the three-dimensionally shaped crystallized glass has a ratio m 2 /m 3 of the inclination m 2 to the inclination m 3 of from 0.3 to 2.

17. A production method for making the three-dimensionally shaped crystallized glass according of claim 1 , the method comprising:
heating a glass at a first treatment temperature of 540° C., at a second treatment temperature of 600° C., and at a third treatment temperature of 710° C. in this order for crystallizing the glass,
wherein the glass comprises, in mass % on an oxide basis:
from 45 to 74% of SiO 2 ;
from 5 to 8% of Al 2 O 3 ;
from 4 to 11.2% of Li 2 O;
from 1 to 10% in total of either one or more of SnO 2 and ZrO 2 ; and
from 1 to 7% of P 2 O 5 .

18. The production method of a crystallized glass according to claim 17 , wherein a treatment time for each of the first treatment temperature, the second treatment temperature, and the third treatment temperature is 4 hours.

19. The three dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis, from 58 to 73.6% of SiO 2 .

20. The three-dimensionally shaped crystallized glass according to claim 19 , comprising, in mass % on an oxide basis, from 5 to 7.6% of Al 2 O 3 .

21. The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis, from 0.5 to 5% of Na 2 O.

22. The three-dimensionally shaped crystallized glass according to claim 1 , wherein the three-dimensionally shaped crystallized glass is formed by at least a crystallization process comprising a first heating treatment at a first temperature of 550 to 800° C., and a second heating treatment at a second temperature of 850 to 1,000° C.

Assignees

• Agc Inc

Inventors

• Li Qing
• Imakita Kenji
• Koike Akio
• Maeda Eriko

Classifications

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C21/002

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

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title

• C03C4/0028

  for crystal glass, e.g. lead-free crystal glass · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title