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Witness layer for glassware

A technology of glass products and witness layers, which is applied in the field of witness layers and can solve the problems of non-destructive methods for strengthening lithium glass with sodium.

Active Publication Date: 2021-10-15
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, there is no non-destructive method for identifying defective sodium-strengthened lithium glasses

Method used

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  • Witness layer for glassware
  • Witness layer for glassware
  • Witness layer for glassware

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The inclusion of a witness layer on sodium strengthened lithium ion glass articles allows for significant post-processing without loss of glass strength. The quality-controlled potassium-rich witness layer of the sodium-strengthened lithium glass allows between 30 and 120 seconds of contact polishing without any corresponding loss of strength.

[0065] In this example, some contact polishing helps to actually increase the strength of the sodium-strengthened lithium glass including the potassium-rich witness layer, as read at no repolishing (1528.9) and at 30 to 120 seconds of contact polishing ( 2123.0 to 2199.4) are shown. The data indicates that the potassium-rich witness layer achieves sustained article strength even after significant contact polishing.

Embodiment 2

[0067] This example shows that the non-destructive FSM images of a sodium strengthened lithium ion glass and the same glass including a potassium rich witness layer are significantly different.

[0068] In this example, it is evident that in the absence of a witness layer, the FSM image is black and uninformative. However, the thin potassium-rich witness layer allows the existence of an FSM image, providing information on both the surface concentration of potassium (separation of lines) and the depth to which the layer extends (total distance between lines). This shows the utility of including a witness layer on a glass article compared to having no witness layer and thus no information.

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Abstract

A glass article is disclosed having: a base layer formed of glass and having a first compressive stress; an adjacent compressive layer formed in the glass and having a second compressive stress a compressive stress; and a witness layer formed in the glass adjacent to the compressive layer and having a third compressive stress. The first compressive stress, the second compressive stress and the third compressive stress are all different from each other. The witness layer also has a higher refractive index than either the base layer or the compressive layer. Methods for manufacturing and methods including quality control using the witness layer are also disclosed.

Description

[0001] Cross References to Related Applications [0002] The present disclosure relates generally to witness layers for use on glass, and more particularly, to witness layers for use on sodium strengthened lithium glass. This Patent Cooperation Treaty patent application claims priority to U.S. nonprovisional application 15 / 134,973, filed April 21, 2016, and entitled "WitnessLayers for Glass Articles," which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates generally to witness layers for use on glass, and more particularly, to witness layers for use on sodium strengthened lithium glass. Background technique [0004] Glasses containing lithium ions (lithium glasses) are becoming more desirable for use in portable electronic devices. Due to the increased use of lithium glass in these smaller and higher tolerance electronic devices, there is a need to make thinner and stronger lithium glass. The lithium glass is a sod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C21/00
CPCC03C21/002C03C3/00C03C4/18C03C2204/00H05K5/0017H05K5/0086H05K5/03C03C21/003
Inventor D·N·梅默林曲德政V·鲁扎托
Owner APPLE INC
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