Glasses and glass ceramics including a metal oxide concentration gradient

A concentration gradient and oxide technology, applied in the field of glass and glass ceramics containing a concentration gradient of metal oxides, can solve problems such as stress distribution of glass-based products that do not show thermal tempering

Active Publication Date: 2016-07-13
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although chemical strengthening is not limited by the thickness of the glass-based article in the same manner as thermal tempering, known chemically strengthened glass-based articles do not exhibit the stress profile of thermally tempered glass-based articles

Method used

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  • Glasses and glass ceramics including a metal oxide concentration gradient
  • Glasses and glass ceramics including a metal oxide concentration gradient
  • Glasses and glass ceramics including a metal oxide concentration gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0195] Glass-ceramic substrates with nominal compositions as shown in Table 2 were provided. The glass-ceramic substrate has a thickness of 0.8 millimeters and includes a crystal phase combination including β-spodumene solid solution as a major crystal phase and one or more minor phases including rutile. The glass-ceramic substrate was impregnated with NaNO 3 and have a temperature of 485°C in a molten salt bath for 10 hours (condition A), 13 hours (condition B) or 24 hours (condition C), or immersed in a solution containing NaNO 3 and having a temperature of 430° C. in a molten salt bath for 2 hours (comparative condition D) to form a glass-ceramic article.

[0196] Table 2: Composition of the glass-ceramic substrate of Example 1 before chemical strengthening

[0197]

[0198] The stress distribution of the glass-ceramic article was measured by a microprobe and shown in Figure 5 middle. like Figure 5 As shown, when using a higher temperature bath (ie, conditions A-C...

Embodiment 2

[0200] By impregnating in the containing 100% NaNO 3 , and having multiple periods of time in a molten salt bath at about 430° C., to chemically strengthen glass substrates having the same composition as shown in Table 2 and a thickness of 0.8 mm, but with an amorphous structure (and no crystalline phase). The DO) and maximum CT values ​​of the glass products were measured using a scattered light polarizer (scattered light polariscope, SCALP). like Figure 6 As shown, the DOC and maximum CT increase with prolonged impregnation or ion exchange. The maximum CT value was observed after immersing the glass for 16 hours.

[0201] The stress distribution of the glass article of Example 2 was measured using SCALP and is shown in Figure 7 middle. The upper portion of the x-axis representing positive stress values ​​is the CT slice, and the lower portion of the x-axis representing negative stress values ​​is the CS value. The stress distribution of the glass article chemically st...

Embodiment 3

[0203] For comparison, by immersing in NaNO with a temperature of 350 °C 3 The glass-ceramic substrate of Example 1 and the glass substrate of Example 2, each having a thickness of about 0.8 mm, were chemically strengthened in a molten salt bath for 3.5 hours (Examples 3A and 3B, respectively). like Figure 8 The resulting stress distributions of the glass-ceramic and glass articles are shown to resemble an error function (erfc) or quasi-linear shape. Furthermore, the CS layer depth is less than the base ion exchange depth into the glass or glass ceramic (or the chemical ion exchange depth).

[0204] When by immersing it in NaNO with a temperature of 430C 3 When molten salt was used for 24 hours to chemically strengthen the glass ceramic substrate of Example 1 and the glass substrate of Example 2, both having a thickness of about 0.8 mm, as described herein (Examples 3C and 3D, respectively), the obtained Glass-based products present as Figure 9 The metal oxide concentrat...

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Abstract

The invention relates to glasses and glass ceramics including a metal oxide concentration gradient. Embodiments of a glass-based article including a first surface and a second surface opposing the first surface defining a thickness (t) of about 3 millimeters or less (e.g., about 1 millimeter or less), and a stress profile, wherein all points of the stress profile between a thickness range from about 0t up to 0.3t and from greater than 0.7t, comprise a tangent that is less than about -0.1 MPa/micrometers or greater than about 0.1 MPa/micrometers, are disclosed. In some embodiments, the glass-based article includes a non-zero metal oxide concentration that varies along at least a portion of the thickness (e.g., 0t to about 0.3t). In some embodiments, the concentration of metal oxide or alkali metal oxide decreases from the first surface to a point between the first surface and the second surface and increases from the point to the second surface. The concentration of the metal oxide may be about 0.05 mol % or greater or about 0.5 mol % or greater throughout the thickness. Methods for forming such glass-based articles are also disclosed.

Description

[0001] Cross reference to related applications [0002] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Serial No. 62 / 194967, filed July 21, 2015, U.S. Provisional Application Serial No. 62 / 171110, filed June 4, 2015 , U.S. Provisional Application Serial No. 62 / 117585 filed on February 18, 2015, and U.S. Provisional Application Serial No. 62 / 061372 filed on October 8, 2014, the entirety of which is incorporated herein by reference middle. Background technique [0003] The present disclosure relates to glass-based articles exhibiting improved damage resistance, including improved fracture resistance, and more particularly to glass and glass-ceramic articles exhibiting non-zero metal oxide A concentration gradient or change in concentration along a substantial portion of the thickness. [0004] Glass-based articles are often subjected to severe impacts that can produce numerous cracks within the surface of such articles. Such cracks may e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/093C03C3/091C03C10/12C03C10/02C03C21/00
CPCC03C3/091C03C3/093C03C10/0027C03C21/002C03C21/005C03C23/007C03C10/00C03C3/097
Inventor 胡广立S·A·蒂切C·M·史密斯唐中帜
Owner CORNING INC
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