Glass articles and methods for improving the reliability of glass articles

Patent metadata

Field	Value
Publication number	US-11807570-B2
Application number	US-202017115123-A
Country	US
Kind code	B2
Filing date	Dec 8, 2020
Priority date	Sep 5, 2014
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

According to one embodiment, a glass article may include a glass body having a first surface and a second surface opposite the first surface. The first surface of the glass body may be etched to a depth less than or equal to about 25% of the maximum initial flaw depth Ai of a flaw population present in the first surface. The flaw population of the first surface is etched to selectively remove material adjacent to each flaw of the flaw population along the maximum initial flaw depth Ai. When the glass article is under uniaxial compressive loading, at least a portion of the first surface is in tension and a uniaxial compressive strength of the glass article is greater than or equal to 90% of a uniaxial compressive strength of a flaw-free glass article.

First claim

The invention claimed is:

1. A glass article comprising:
a glass body comprising a first surface and a second surface opposite the first surface, the first surface and the second surface each having a radius of curvature;
the first surface of the glass body comprising a flaw population extending from the first surface into a thickness of the glass body with a maximum initial flaw depth Ai, wherein:
the first surface of the glass body is etched to a depth less than or equal to about 25% of the maximum initial flaw depth Ai of the flaw population present in the first surface;
the flaw population of the first surface is etched to selectively remove material adjacent to each flaw of the flaw population along the maximum initial flaw depth Ai;
under uniaxial compressive loading, at least a portion of the first surface is in tension and a uniaxial compressive strength of the glass article is greater than or equal to 90% and less than 100% of a uniaxial compressive strength of a flaw-free glass article; and
the glass article is chemically processed by contacting the first surface of the glass article with an etching solution, wherein the etching solution comprises a mixture of hydrofluoric acid having a first molarity from 0.5 M to 3.0 M and at least one mineral acid having a second molarity that is 3 to 6 times the first molarity; and the etching solution uniformly removes glass material from the external surface of the glass article and adjacent to each flaw in the flaw population without creating a gel layer.

2. The glass article of claim 1 , wherein a uniaxial compressive strength of the glass article is greater than or equal to 95% of a uniaxial compressive strength of a flaw-free glass article.

3. The glass article of claim 1 , wherein a uniaxial compressive strength of the glass article is greater than or equal to 98% of a uniaxial compressive strength of a flaw-free glass article.

4. The glass article of claim 1 , wherein a Weibull strength distribution of the glass article is within 10% of a calculated Weibull strength distribution of a flaw-free glass article.

5. The glass article of claim 1 , wherein a Weibull strength distribution of the glass article is within 5% of a calculated Weibull strength distribution of the flaw-free glass article.

6. The glass article of claim 1 , wherein the first surface of the glass article is etched to a depth greater than or equal to about 5% of the maximum initial flaw depth Ai of the flaw population present in the first surface.

7. The glass article of claim 1 , wherein the glass article is a glass container and the first surface of the glass article is an external surface of the glass container and the second surface is an internal surface of the glass container.

8. The glass article of claim 7 , wherein the glass container is a pharmaceutical package.

9. The glass article of claim 1 , wherein the glass article is formed from an alkali-aluminosilicate glass composition.

Assignees

• Corning Inc

Inventors

• Demartino Steven Edward
• Ellison Adam James
• Hoff Kyle Christopher

Classifications

• C03C23/0095

  Solution impregnating; Solution doping; Molecular stuffing, e.g. of porous glass (in manufacture of preforms C03B37/012) · CPC title

• C03C15/00 Primary

  Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) · CPC title

• A61J1/1468

  Containers characterised by specific material properties · CPC title

• B65D1/0207 Primary

  characterised by material, e.g. composition, physical features · CPC title

• A61J1/00

  Containers specially adapted for medical or pharmaceutical purposes (capsules or the like for oral use A61J3/07; specially adapted for surgical or diagnostic appliances or instruments A61B50/30; containers for radioactive substances G21F5/00) · CPC title