Glass-based articles including a stress profile comprising two regions, and methods of making

A stress distribution, glass-based technology, applied in the field of glass and glass-ceramic products, glass-based products, can solve the problem of stress distribution of glass-based products without thermal tempering

Pending Publication Date: 2017-10-20
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although chemical strengthening is not as limited by the thickness of the glass-based article as thermal tempering is, known chemically strengthened glass-based articles do not have the stress profile of thermally tempered glass-based articles

Method used

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  • Glass-based articles including a stress profile comprising two regions, and methods of making
  • Glass-based articles including a stress profile comprising two regions, and methods of making
  • Glass-based articles including a stress profile comprising two regions, and methods of making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0098] As used herein, the term "about" means that quantities, dimensions, formulations, parameters and other quantities and characteristics are not exact or need be exact, but may be approximate and / or larger or smaller as required, such as reflective tolerances, conversions factors, rounding, measurement errors, etc., and others known to those skilled in the art. When the term "about" is used to describe a value or the end of a range, it is to be understood that the disclosure includes the specific value or end to which it refers. Regardless of whether the numerical value or the end value of the range in the description has "about", the numerical value or the end value of the range is intended to include the following two embodiments: one is modified by "about", and the other is not modified by "about". "Retouch. It should also be understood that the endpoints of each range are meaningful in combination with the other endpoints as well as independently of the other endpoint...

Embodiment 1

[0341] Examples 1A-1G included glass substrates having the following nominal composition: about 63.46 mole % SiO 2 , 15.71 mol% Al 2 o 3 , 6.37 mol% Li 2 O, 10.69 mol% Na 2 O, 0.06 mol% MgO, 1.15 mol% ZnO, 2.45 mol% P 2 o 5 and 0.04 mol% SnO 2 . The glass substrate has a thickness of 0.8mm. According to the conditions listed in Table 2, the glass substrates of Examples 1A-1G contained 100% NaNO 3 Ion exchange is performed in a molten salt bath with a temperature of about 390°C. The resulting glass-based article has a maximum CT value, which is plotted as a function of ion exchange time in Figure 5 .

[0342] The ion exchange condition of table 2 embodiment 1A-1G

[0343] Example

Immersion time in bath (hours)

Maximum CT

1A

0.5

30

1B

1

42

1C

1.5

52

1D

2

56

1E

3.75

67

1F

8

63

1G

16

55

[0344] The stress distribution of Example 1E was measure...

Embodiment 2

[0348] Example 2A included a glass substrate having the same composition as Example 1 and having a thickness of 0.8 mm. The glass substrate contains 51% KNO 3 and 49% NaNO 3 and ion exchange in a single molten salt bath having a temperature of about 380°C for 3.75 hours. The resulting glass-based articles had stress profiles as described in Table 4.

[0349] The stress distribution of table 4 embodiment 2A

[0350] surface compressive stress

500MPa

layer depth for potassium

12 microns

Stress at the DOL of potassium

161 MPa

Maximum CT

70MPa

DOC

150 microns

[0351] The AROR test as described herein was performed on the glass-based article of Example 2A. One set of glass-based articles was abraded with a load or pressure of 5 psi, a second set of glass-based articles was abraded with a load or pressure of 25 psi, and a third set of glass-based articles was abraded with a load or pressure of 45 psi. Figure 7 AROR...

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Abstract

The invention provides glass-based articles including a stress profile comprising two regions and methods of making. The glass-based article includes a first surface and a second surface opposing the first surface defining a thickness (t) in a range of 0.1-2mm, and a stress profile extending along the thickness (t), wherein at last one point in the stress profile in a first thickness range of about 0.t to 0.020.t and greater than 0.98.t has a tangent line which has a slope from about -200MPa/[mu]m to -25MPa/[mu]m or from 25MPa/[mu]m to 200 MPa/[mu]m, and all points in the stress profile in a second thickness range of from about 0.035.t to less than 0.965.t have tangent lines which have a slope from about -15MPa/[mu]m to 15MPa/[mu]m. The stress profile contains surface CS about 200-100MPa, wherein the stress profile contains the DOC in the range of about 0.1.t to 0.25.t.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Serial No. 62 / 320109, filed April 8, 2016, the contents of which are the basis of this application and are hereby incorporated by reference in their entirety. [0003] background technical field [0004] The present disclosure relates to glass-based articles exhibiting improved damage resistance, including improved crack resistance, and more particularly to fusion-formable glass and glass-ceramic articles having non-zero metal oxide concentration gradients or along the thickness The concentration of the main part of the change. The present disclosure also relates to glass-based articles having a stress profile with two regions having varying tangents. Background technique [0005] Glass-based articles are often subjected to severe impacts that can cause large flaws in the surface of such articles. Such imperfections can extend from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C3/097C03C4/00
CPCC03C3/097C03C4/00C03C21/002C03C3/093H05K5/0217H05K5/03H04B1/3888H04M1/0266H05K5/0017
Inventor T·M·格罗斯郭晓菊P·奥拉姆K·B·赖曼R·V·鲁斯夫V·M·施奈德T·E·维兰特维兹
Owner CORNING INC
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