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
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.
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.