Crystallized glass and crystallized glass substrate
Provided is a high-strength crystallized glass or substrate having a high visible light transmittance and a good color balance, which is suitable for use in protecting members of portable electronic devices, optical devices and the like. Provided is a crystallized glass comprising, in terms of mol % on an oxide basis: an SiO 2 component of 30.0% or more and 70.0% or less, an Al 2 O 3 component of 8.0% or more and 25.0%, an Na 2 O component of 0% or more and 25.0% or less, an MgO component of 0% or more and 25.0% or less, a ZnO component of 0% or more and 30.0% or less and a TiO 2 component of 0% or more and 10.0% or less, the molar ratio [Al 2 O 3 /(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and comprising one or more selected from RAl 2 O 4 , RTi 2 O 5 , R 2 TiO 4 , R 2 SiO 4 , RAl 2 Si 2 O 8 and R 2 Al 4 Si 5 O 18 as a crystal phase.
1. A crystallized glass substrate comprising a crystallized glass as a base material, and having a compressive stress layer in a surface thereof, wherein the compressive stress layer has a compressive stress value of 800 MPa or more; and
the crystallized glass comprises, in terms of mol % on an oxide basis:
an SiO2 component of 30.0% or more and 70.0% or less,
an Al 2 O 3 component of 8.0% or more and 25.0% or less,
an Na 2 O component of 6.0% or more and 25.0% or less,
an MgO component of 0% or more and 25.0% or less,
an ZnO component of 0% or more and 10.0% or less,
a TiO 2 component of 0% or more and 10.0% or less, and
a B 2 O 3 component of 0% or more and less than 2.0%,
the molar ratio [Al 2 O 3 /(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and
comprises one or more selected from RAl 2 O 4 , RTi 2 O 5 , R 2 TiO 4 , R 2 SiO 4 , RAl 2 Si 2 O 8 , R 2 Al 4 Si 5 O 18 and MgTi 2 O 4 as a crystal phase, provided that R is one or more selected from Zn, Mg and Fe.
2. The crystallized glass substrate according to claim 1 , wherein the molar ratio [TiO 2 /Na 2 O] of the TiO 2 component to the Na 2 O component in terms of mol % on an oxide basis of the crystallized glass has a value of 0 or more and 0.41 or less.
3. The crystallized glass substrate according to claim 1 , wherein the molar ratio [MgO/Na 2 O] of the MgO component to the Na 2 O component in terms of mol % on an oxide basis of the crystallized glass has a value of 0 or more and 1.60 or less.
4. The crystallized glass substrate according to claim 1 , wherein a light transmittance across a thickness of 1 mm at a wavelength of 500 nm including reflectance loss of the crystallized glass is more than 50%.
5. The crystallized glass substrate according to claim 1 , wherein the difference in light transmittance across a thickness of 1 mm including reflectance loss at a wavelength of 700 nm and at a wavelength of 500 nm of the crystallized glass is within 2.0%, and the difference in light transmittance across a thickness of 1 mm including reflection loss at a wavelength of 700 nm and at a wavelength of 410 nm of the crystallized glass is within 6.0%.
6. The crystallized glass substrate according to claim 1 , wherein the total value of the content of the MgO component and the content of the ZnO component of the crystallized glass is 1.0% or more and 30.0% or less in terms of mol % on an oxide basis.
7. The crystallized glass substrate according to claim 1 , the crystallized glass comprising, in terms of mol % on an oxide basis:
a P 2 O 5 component of 0% or more and 10.0% or less,
a K 2 O component of 0% or more and 20.0% or less,
a CaO component of 0% or more and 10.0% or less,
a BaO component of 0% or more and 10.0% or less,
an FeO component of 0% or more and 8% or less,
a ZrO 2 component of 0% or more and 10.0% or less, and
an SnO 2 component of 0% or more and 5.0% or less.
8. The crystallized glass substrate according to claim 1 , the crystallized glass comprising, in terms of mol % on an oxide basis:
an Li 2 O component of 0% or more and 10.0% or less,
an SrO component of 0% or more and 10.0% or less,
an La 2 O 3 component of 0% or more and 3% or less,
a Y 2 O 3 component of 0% or more and 3% or less,
an Nb 2 O 5 component of 0% or more and 5% or less,
a Ta 2 O 5 component of 0% or more and 5% or less, and
a WO3 component of 0% or more and 5% or less.
9. The crystallized glass substrate according to claim 1 , wherein the compressive stress layer has a thickness of 1 μm or more.
10. The crystallized glass substrate according to claim 1 , wherein the content of the B 2 O 3 component of the crystallized glass is 0 mol %.
11. The crystallized glass substrate according to claim 1 , the crystallized glass further comprising a clarifier selected from a SnO 2 component and a Sb 2 O 3 component in an amount of at most 1.0 mol %.
12. The crystallized glass substrate according to claim 1 , the crystallized glass further comprising a Sb 2 O 3 component in an amount of at most 1.0 mol %.
13. A crystallized glass substrate comprising a crystallized glass as a base material, and having a compressive stress layer in a surface thereof, wherein the compressive stress layer has a compressive stress value of 800 MPa or more; and
the crystallized glass comprises, in terms of mol % on an oxide basis:
an SiO 2 component of 30.0% or more and 70.0% or less,
an Al 2 O 3 component of 8.0% or more and 25.0% or less,
an Na 2 O component of 10.61% or more and 25.0% or less,
an MgO component of 0% or more and 25.0% or less,
an ZnO component of 0% or more and 30.0% or less,
a TiO 2 component of 0% or more and 10.0% or less, and
a B 2 O 3 component of 0% or more and less than 2.0%,
the molar ratio [Al 2 O 3 /(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and
comprises one or more selected from RAl 2 O 4 , RTi 2 O 5 , R 2 TiO 4 , R 2 SiO 4 , RAl 2 Si 2 O 8 , R 2 Al 4 Si 5 O 18 and MgTi 2 O 4 as a crystal phase, provided that R is one or more selected from Zn, Mg and Fe.
14. A crystallized glass substrate comprising a crystallized glass as a base material, and having a compressive stress layer in a surface thereof, wherein the compressive stress layer has a compressive stress value of 800 MPa or more; and
the crystallized glass comprises, in terms of mol % on an oxide basis:
an SiO 2 component of 30.0% or more and 70.0% or less,
an Al 2 O 3 component of 8.0% or more and 25.0% or less,
an Na 2 O component of 6.0% or more and 25.0% or less,
an MgO component of 0% or more and 25.0% or less,
an ZnO component of 0% or more and 30.0% or less,
a TiO 2 component of 0% or more and 10.0% or less,
a B 2 O 3 component of 0% or more and less than 2.0%, and
a Sb 2 O 3 component of more than 0% and 1.0% or less,
the molar ratio [Al 2 O 3 /(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and
comprises one or more selected from RAl 2 O 4 , RTi 2 O 5 , R 2 TiO 4 , R 2 SiO 4 , RAl 2 Si 2 O 8 , R 2 Al 4 Si 5 O 18 and MgTi 2 O 4 as a crystal phase, provided that R is one or more selected from Zn, Mg and Fe.