Ion exchange processes and chemically strengthened glass substrates resulting therefrom

• US 10,273,184 B2
• Filed: 10/13/2014
• Issued: 04/30/2019
• Est. Priority Date: 10/14/2013
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Garner, Sean Matthew, Sorensen, Michael Lesley
• Primary Examiner(s): Sample, David
• Application Number:
  US15/026,691
• Publication Number:
  US 20160214889A1
• Time in Patent Office: 1,660 Days
• CPC Class Codes: B32B 17/061 of metal
• CPC Class Codes: B32B 17/10 of synthetic resin
• CPC Class Codes: B32B 17/10137 Chemical strengthening
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 3/076 with 40% to 90% silica, by weight C03C3/045 takes precedence
• CPC Class Codes: C03C 3/078 containing an oxide of a divalent metal, e.g. an oxide of zinc
• CPC Class Codes: C03C 3/083 containing aluminium oxide or an iron compound
• CPC Class Codes: C03C 3/085 containing an oxide of a divalent metal
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 3/089 containing boron
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: C03C 3/093 containing zinc or zirconium
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 4/18 for ion-sensitive glass

Abstract

A method of performing ion exchange of a thin, flexible glass substrate having an average thickness equal to or less than about 0.3 mm to chemically strengthen the glass substrate is disclosed. The chemically strengthened glass substrate comprises a first compressive stress layer having a first depth of layer, and a second compressive stress layer having a second depth of layer, the first and second stress layers being separated by a layer of tensile stress. A laminated article comprising the chemically strengthened glass substrate is also described.

Claims

1. A laminate article comprising:

a first substrate; and

a second substrate comprising a first surface and a second surface opposite the first surface, wherein an average thickness of the second substrate between the first surface and the second surface is equal to or less than about 0.3 mm, the second surface being bonded to the first substrate, the second substrate comprising;

a glass substrate including;

a first compressive stress layer extending inward toward a center of the glass substrate from the first surface comprising a first depth of layer DOL₁;

a second compressive stress layer extending inward toward the center of the glass substrate from the second surface comprising a second depth of layer DOL₂;

wherein DOL₁ is greater than DOL₂; and

wherein DOL₁ is greater than 25% of the average thickness of the glass substrate.

2. The laminate article according to claim 1, wherein the first substrate comprises a polymer.

3. The laminate article according to claim 1, wherein the first substrate comprises metal.

4. The laminate article of claim 1, wherein DOL₁ is at least 2% greater than DOL₂.

5. The laminate article of claim 1, wherein DOL₁ is at least 6% greater than DOL₂.

6. The laminate article of claim 1, wherein DOL₁ is at least 10% greater than DOL₂.

7. The laminate article of claim 1, wherein the compressive stress at the first surface of the second substrate is at least 500 MPa.

8. The laminate article of claim 1, wherein the compressive stress at the first surface of the second substrate is at least 950 MPa.

9. The laminate article of claim 1, wherein the compressive stress at the second surface of the second substrate is at least 850 MPa.