Title:
CRYSTALLIZED GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2019/003565
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a crystallized glass substrate which is hard, is less liable to break, and is less liable to shatter even if the glass substrate does break. The crystallized glass substrate comprises, as a base material, a crystallized glass including, in weight% in terms of oxide, 40.0% to 70.0% of an SiO2 component, 11.0% to 25.0% of an Al2O3 component, 5.0% to 19.0% of an Na2O component, 0% to 9.0% of a K2O component, 1.0% to 18.0% of one or more components selected from an MgO component and a ZnO component, 0% to 3.0% of a CaO component, and 0.5% to 12.0% of a TiO2 component, and including 90% or more in total of the SiO2 component, the Al2O3 component, the Na2O component, the one or more components selected from the MgO component and the ZnO component, and the TiO2 component. The crystallized glass substrate has a compressive stress layer on the surface, the compressive stress layer having a stress depth of 40 μm or more, a surface compressive stress of 750 MPa or more, and a center compressive stress calculated by curve analysis of 65 MPa or less.
Inventors:
YAGI TOSHITAKA (JP)
YAMASHITA YUTAKA (JP)
GOTO NAOYUKI (JP)
YAMASHITA YUTAKA (JP)
GOTO NAOYUKI (JP)
Application Number:
PCT/JP2018/015069
Publication Date:
January 03, 2019
Filing Date:
April 10, 2018
Export Citation:
Assignee:
OHARA KK (JP)
International Classes:
C03C3/085; C03C10/08; C03C21/00; G02B1/00; G06F3/041
Domestic Patent References:
| WO2012124758A1 | 2012-09-20 | |||
| WO2017094329A1 | 2017-06-08 |
Foreign References:
| JP2017001937A | 2017-01-05 | |||
| JP2017014066A | 2017-01-19 | |||
| JP2014040353A | 2014-03-06 | |||
| JP2006062929A | 2006-03-09 |
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