Crystallized glass

一种结晶化玻璃、氧化物的技术，应用在结晶化玻璃领域，能够解决可见光透射性差、无法获得压缩应力值等问题

Active Publication Date: 2019-09-20
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This crystallized glass has poor visible light transmittance
In addition, in the case of chemical strengthening, a sufficient compressive stress value cannot be obtained, and the stress layer cannot be formed deep

Method used

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  • Crystallized glass
  • Crystallized glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～29

[0116] (Examples 1 to 29, Comparative Example 1)

[0117] As raw materials for each component of crystallized glass, the corresponding oxides, hydroxides, carbonates, nitrates, fluorides, metaphosphoric acid compounds and other raw materials are selected, and then weighed in such a way that the following composition ratios are obtained. These ingredients are mixed well and evenly.

[0118] (% by weight in terms of oxides)

[0119] SiO 2 Composition is 55%, Al 2 o 3 The composition is 18%, Na 2 O composition is 12%, K 2 O composition is 2%, MgO composition is 8%, CaO composition is 1%, TiO 2 Composition is 5%, Sb 2 o 3 The composition is 0.1%.

[0120] Next, the mixed raw materials are put into a platinum crucible and melted. Thereafter, the melted glass is stirred to homogenize it, cast into a mold, etc., and cooled slowly to produce raw glass.

[0121] For nucleation and crystallization, the obtained original glass is subjected to a one-stage heat treatment to prod...

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PUM

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Abstract

Provided is a crystallized glass characterized in that: a crystallized glass is used as a base material; a compressive stress layer is present at the surface; at a thickness of 10 mm, the wavelength at which the light transmittance, including reflection loss, is 80% is 400-669 nm; and Vickers hardness [Hv] is 835-1300. In the crystallized glass, the thickness of the compressive stress layer is 20 mum or more. The crystallized glass base material contains, in terms of wt.% of oxides, 40.0-70.0% of a SiO2 component, 11.0-25.0% of an Al2O3 component, 5.0-19.0% of a Na2O component, 0-9.0% of a K2O component, 1.0-18.0% of a MgO component, 0-3.0% of a CaO component and 0.5-12.0% of a TiO2 component, and contains 90% or more in total of a SiO2 component, an Al2O3 component, a Na2O component, a K2O component, a MgO component and a TiO2 component.

Description

technical field [0001] The present invention relates to a crystallized glass having a compressive stress layer on the surface. In particular, the present invention relates to a crystallized glass suitable for protective parts of portable electronic devices, optical devices, and the like. Background technique [0002] In portable electronic devices such as smartphones and tablet computers, cover glass is used to protect the display. In addition, in automotive optical equipment, protectors are also used to protect the lens. These are required to have high visible light transmittance and excellent color balance as materials for cover glass or protector applications. Also, in recent years, in order to make these devices withstand more severe usage environments, there has been a strong demand for materials having higher hardness when used for cover glass or protector applications. [0003] Conventionally, chemically strengthened glass has been used as a material for the above-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03C10/08C03C21/00
CPCC03C21/002C03C10/0045C03C3/087C03C3/078C03C21/00C03C4/0092
Inventor 八木俊刚山下丰后藤直雪
Owner OHARA
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