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Asymmetric ion-exchange methods of making strengthened articles with asymmetric surfaces

An ion exchange and product technology, which is applied in the field of asymmetric ion exchange for making reinforced products with asymmetric surfaces, can solve problems such as increasing manufacturing costs and increasing production costs.

Inactive Publication Date: 2021-02-19
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these additional process steps result in significantly increased manufacturing costs
Other methods (including post-production grinding and polishing or chemical or heat treatment) can also counteract the warpage effect, but also significantly increase the production cost

Method used

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  • Asymmetric ion-exchange methods of making strengthened articles with asymmetric surfaces
  • Asymmetric ion-exchange methods of making strengthened articles with asymmetric surfaces
  • Asymmetric ion-exchange methods of making strengthened articles with asymmetric surfaces

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] in accordance with Figure 8 to prepare a pair of aluminosilicate cover glass specimens having dimensions of 333mm x 124mm x 1.05mm and each having AG-treated A form of surface modification where the non-AG surfaces of the cover glass face each other and are separated by a distance d. The combined maximum warpage between the two non-AG sides is 0.05 mm, which is considered the maximum natural separation within the pair (a). The pairs are then loaded vertically into the cassette with a separation of more than 10 mm between the AG surface and the nearest pair (D > 10 mm). High purity KNO at 420°C 3Perform ion exchange in salt for up to 6 hours. Warpage was measured on both sides of the specimens after separation and cleaning using an ISRA Vision 650 x 1300mm inclinometer system. The measurement results are summarized in Table 1. It can be seen that the two cover sheets of the pair have convex AG surfaces.

example 2

[0086] A pair of glass samples was prepared in the same manner as in Example 1, except that the maximum natural separation (a) within the pair was 0.06 mm. The warpage measurements are summarized in Table 1. The two cover sheets of the pair have convex AG surfaces.

example 3

[0088] A pair of glass samples was prepared in the same manner as in Example 1, except that the maximum natural separation (a) within the pair was 0.18 mm. The pairs were loaded vertically into cassettes for ion exchange. One of the two cover glass pieces broke during handling, so the warpage test evaluation for only one cover glass piece is summarized in Table 1. The cover sheet has a convex AG surface.

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Abstract

A method of making strengthened articles that includes the steps of: providing articles each having a first primary surface and a second primary surface, the first and second primary surfaces having one or more asymmetric surface features; providing a first ion-exchange bath; and performing an ion-exchange step by submersing the articles in the first ion-exchange bath to form strengthened articles. The articles are arranged in the first ion-exchange bath with the first primary surface of each facing the first primary surface of another of the articles at a first predetermined distance, and thesecond primary surface of each is facing the second primary surface of another of the articles at a second predetermined distance. The first predetermined distance and the second predetermined distance are selected such that the plurality of strengthened articles have a first strengthened surface with a convex surface, and a second strengthened surface with a concave surface.

Description

[0001] Cross-references to related applications [0002] This application claims the benefit of priority under the Patents Act to U.S. Provisional Patent Application No. 62 / 694,136, filed July 5, 2018, which is hereby attached and incorporated by reference in its entirety In this article. technical field [0003] The present disclosure relates generally to methods of making strengthened articles, and more particularly to asymmetric ion exchange of substrates having asymmetric surfaces for making strengthened glass, glass-ceramic, and ceramic substrates employed in various articles Method dependent. Background technique [0004] Protective display covers based on glass substrates are used in several industries including consumer electronics (e.g. smartphones, tablets, tablet touch computers, notebooks, e-readers, etc.), automotive, interior construction, defense , medical, and packaging industries. Glass substrates chemically strengthened through an ion exchange process pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C3/085C03C3/091C03C3/097
CPCC03C21/002C03C3/085C03C3/097C03C3/091C03C15/00C03C23/00C03C17/00C03C19/00
Inventor 侯军李乔
Owner CORNING INC