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Glass-based articles with improved stress distribution

A stress-distributed, glass-based technology, applied in the field of glass-based products with improved stress distribution, that can solve the problems of expensive and complex development and manufacturing of a variety of new glass compositions or platforms

Active Publication Date: 2022-07-15
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, however, the development and manufacture of multiple entirely new glass compositions or platforms can be an expensive and complex proposition for glass manufacturers and their customers in many other market segments and applications.

Method used

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  • Glass-based articles with improved stress distribution
  • Glass-based articles with improved stress distribution
  • Glass-based articles with improved stress distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] Various embodiments of the present invention are further illustrated by the following examples. In the examples, prior to strengthening, the examples are referred to as "substrates". After being strengthened, the embodiments are referred to as "articles" or "glass-based articles."

[0090] In all examples, a soda lime silicate glass substrate with a thickness of 0.7 mm was used. The composition is based on oxide: 73.5 wt% SiO 2 , 1.7 wt% Al 2 O 3 , 12.28 wt% Na 2 O, 0.24 wt% K 2 O, 4.5 wt% MgO, 7.45 wt% CaO, 0.017 wt% ZrO 2 , 0.032 wt% TiO 2 , 0.002wt% SnO 2 , 0.014 wt% SrO, 0.093 wt% Fe 2 O 3 , 0.001 wt% HfO 2 , 0.028 wt% Cl oxide and 0.203 wt% SO 3 .

[0091] The compressive stress (CS) at the surface was measured using a surface stress meter (FSM), FSM-6000 manufactured by Orihara Industrial Co., Ltd., Japan. Compressive stress (CSk), depth of layer (DOL), depth of compression (DOC) and central tension (CT) at the DOL were measured by the Refractive Nea...

Embodiment 1

[0095] Glass-based articles are formed by exposing soda lime silicate glass substrates to two process treatments. The first treatment (doping) was an ion bath with a bath temperature of 490°C containing 25 wt% KNO 3 , 74 wt% NaNO and 1 wt% LiNO 3 , and lasts 12 hours. The second treatment (intensification) was an ion bath with a bath temperature of 430°C containing 89% by weight KNO 3 , 1 wt% K 2 CO 3 and 10 wt% NaNO for 12 hours.

Embodiment 2

[0097] Glass-based articles are formed by exposing soda lime silicate glass substrates to two process treatments. The first treatment (doping) is the same as in Example 1: ion bath with a bath temperature of 490°C, containing 25 wt% KNO 3 , 74 wt% NaNO and 1 wt% LiNO 3 , and lasts 12 hours. The second treatment (intensification) was an ion bath with a bath temperature of 430°C containing 89% by weight KNO 3 , 1 wt% K 2 CO 3 and 10 wt% NaNO for 4 hours.

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Abstract

A glass-based article comprising: a glass-based substrate having opposing first and second surfaces defining a thickness (t) of the substrate; a stress distribution comprising: a region of compressive stress and a central tension region, the compressive stress The zone extends from the first surface to a depth of compression (DOC) at 0.04·t or more. Alkali metal oxides are present in the central tension zone. A first metal oxide and a second metal oxide, the metal of the first metal oxide having the same or smaller atomic radius than the metal of the alkali metal oxide, the metal of the second metal oxide having a smaller atomic radius than the metal of the alkali metal oxide The larger atomic radius of the metal of the alkali metal oxide, both of which are present in independent concentrations that vary in at least a portion of the compressive stress region. The glass-based substrate is exposed to a multi-step ion exchange process that includes a first treatment doped with smaller ions than the alkali metal oxide; and a second treatment enhanced with larger ions.

Description

[0001] Cross-references to related fields of application [0002] This application claims the benefit of priority under 35 U.S.C. § 119 to US Provisional Application Serial No. 62 / 531,964, filed July 13, 2017, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] Embodiments of the present disclosure generally relate to glass-based articles with improved stress distribution and high compression depths and methods of making the same. Background technique [0004] Glass-based products are used in a variety of industries, including consumer electronics, transportation, construction, defense, medical, and packaging. For consumer electronics, glass-based articles are used in electronic devices as covers or windows for portable or mobile electronic communication and entertainment devices such as cell phones, smartphones, tablets, video players , information terminal (IT) devices, notebook computers, navigation systems, etc. In con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C21/00
CPCC03C21/002C03C3/11C03C4/18C03C2204/00
Inventor 李乔S·帕尔
Owner CORNING INC