Crystallized glass and crystallized glass substrate

Patent metadata

Field	Value
Publication number	US-2016355434-A1
Application number	US-201615172844-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Jun 4, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . 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% or less, 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, an 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, provided that R is one or more selected from Zn, Mg and Fe.

2 . The crystallized glass 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 has a value of 0 or more and 0.41 or less.

3 . The crystallized glass 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 has a value of 0 or more and 1.60 or less.

4 . The crystallized glass according to claim 1 , wherein a light transmittance across a thickness of 1 mm at a wavelength of 500 nm including reflectance loss is more than 50%.

5 . The crystallized glass 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 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 is within 6.0%.

6 . The crystallized glass according to claim 1 , wherein the total value of the content of the MgO component and the content of the ZnO component is 1.0% or more and 30.0% or less in terms of mol % on an oxide basis.

7 . The crystallized glass according to claim 1 , comprising, in terms of mol % on an oxide basis:
a B 2 O 3 component of 0% or more and 25.0% or less, 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 according to claim 1 , 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 WO 3 component of 0% or more and 5% or less.

9 . A crystallized glass substrate comprising the crystallized glass according to claim 1 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 300 MPa or more.

10 . The crystallized glass substrate according to claim 9 , wherein the compressive stress layer has a thickness of 1 μm or more.

Assignees

• Ohara Kk

Inventors

• Momono Kiyoyuki

Classifications

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03C4/0092

  for glass with improved high visible transmittance, e.g. extra-clear glass · CPC title

• B32B2307/412

  Transparent · CPC title

• C03C21/002

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

• C03C3/095

  containing rare earths · CPC title