Process for producing chemically strengthened glass
View Patent ↗A process for producing a chemically strengthened glass is provided. The method for producing a chemically strengthened glass includes subjecting a phase-separated glass to an ion exchange treatment. A chemically strengthened glass which is obtained by the process and a phase-separated glass which has been subjected to the ion exchange treatment are also provided.
1. A phase-separated glass comprising a compressive stress layer in a surface thereof, which has a surface compressive stress of 300 MPa or more and a tensile stress of 50 MPa or less.
2. The phase-separated glass according to claim 1 ,
wherein a linear transmittance at a wavelength of 400 nm is 30% or less in terms of a thickness of 1 mm, and
a total light reflectance at the same wavelength is 10% or more in terms of a thickness of 1 mm.
3. An electronic device housing, comprising the phase-separated glass according to claim 2 .
4. The phase-separated glass according to claim 1 , which is in a binodal state which has a shape in which one separated phase in a form of an independent spherical shape is dispersed in a matrix of another separated phase, wherein an average diameter of the separated phase which is dispersed in a form of an independent spherical shape is 40 nm to 3000 nm.
5. A process for producing the phase-separated glass according to claim 4 , comprising heating a glass for 24 hours or less for phase-separation of the glass.
6. A phase-separated glass, wherein, in a three-point bending strength test, a value obtained by dividing a value obtained by subtracting a three-point bending strength in 2 kg of Vickers indenter insertion load from a three-point bending strength in 0 kg of Vickers indenter insertion load by the three-point bending strength in 0 kg of Vickers indenter insertion load is 70% or less.
7. The phase-separated glass according to claim 6 ,
wherein a linear transmittance at a wavelength of 400 nm is 30% or less in terms of a thickness of 1 mm, and
a total light reflectance at the same wavelength is 10% or more in terms of a thickness of 1 mm.
8. An electronic device housing, comprising the phase-separated glass according to claim 7 .
9. The phase-separated glass according to claim 6 , which is in a binodal state which has a shape in which one separated phase in a form of an independent spherical shape is dispersed in a matrix of another separated phase, wherein an average diameter of the separated phase which is dispersed in a form of an independent spherical shape is 40 nm to 3000 nm.
10. A process for producing the phase-separated glass according to claim 9 , comprising heating a glass for 24 hours or less for phase-separation of the glass.
11. A phase-separated glass which is not fractured when a Vickers indenter is inserted with a load of 19.6 N.
12. The phase-separated glass according to claim 11 ,
wherein a linear transmittance at a wavelength of 400 nm is 30% or less in terms of a thickness of 1 mm, and
a total light reflectance at the same wavelength is 10% or more in terms of a thickness of 1 mm.
13. An electronic device housing, comprising the phase-separated glass according to claim 12 .
14. The phase-separated glass according to claim 11 , which is in a binodal state which has a shape in which one separated phase in a form of an independent spherical shape is dispersed in a matrix of another separated phase, wherein an average diameter of the separated phase which is dispersed in a form of an independent spherical shape is 40 nm to 3000 nm.
15. A process for producing the phase-separated glass according to claim 14 , comprising heating a glass for 24 hours or less for phase-separation of the glass.
16. A phase-separated glass, wherein an average falling ball height at a time of fracture is 8 cm or more in a sandpaper falling ball test in which a spherical object which is made of 29 g of stainless steel and has a diameter of 19.1 mm is dropped from an upper side in a state where the phase-separated glass is placed on a base made of granite and an upper surface of the phase-separated glass is brought into contact with an abrasive surface of a sandpaper of P30 (JIS 86252: 2006).
17. The phase-separated glass according to claim 16 ,
wherein a linear transmittance at a wavelength of 400 nm is 30% or less in terms of a thickness of 1 mm, and
a total light reflectance at the same wavelength is 10% or more in terms of a thickness of 1 mm.
18. An electronic device housing, comprising the phase-separated glass according to claim 17 .
19. The phase-separated glass according to claim 16 , which is in a binodal state which has a shape in which one separated phase in a form of an independent spherical shape is dispersed in a matrix of another separated phase, wherein an average diameter of the separated phase which is dispersed in a form of an independent spherical shape is 40 nm to 3000 nm.
20. A process for producing the phase-separated glass according to claim 19 , comprising heating a glass for 24 hours or less for phase-separation of the glass.