Glass articles and methods for improving the reliability of glass articles

Patent metadata

Field	Value
Publication number	US-10899659-B2
Application number	US-201515508815-A
Country	US
Kind code	B2
Filing date	Sep 4, 2015
Priority date	Sep 5, 2014
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

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 and the second surface each have a radius of curvature. The first surface of the glass body comprises a flaw population extending from the first surface into a thickness of the glass body with a maximum initial flaw depth Ai. 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 the flaw population present in the first surface. 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 method for improving the reliability of glass articles, the method comprising:
providing a glass article having a first surface, a second surface opposite the first surface, an initial thickness T i extending from the first surface to the second surface, and a flaw population with a maximum initial flaw depth A i extending from the first surface into the initial thickness T i ;
selectively removing glass material from the first surface of the glass article and adjacent to each flaw in the flaw population at a uniform rate by chemically processing at least the first surface of the glass article at a temperature and for a time such that, after chemically processing:
flaws having the maximum initial flaw depth A i remain in the glass article and have a post-processing stress concentration factor Kt pp at a tip of the flaw which is less than an initial stress concentration factor Kt i at the tip of the flaw prior to chemical processing;
the flaw population has a maximum post-processing flaw depth A pp ;
a post-processing thickness T pp of the glass article is less than the initial thickness T i ; and
|T pp −T i | is less than or equal to |A pp −A i |,

wherein 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 about 0.5 M to about 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 first surface of the glass article and adjacent to each flaw in the flaw population without creating a gel layer.

2. The method of claim 1 , wherein the first surface and the second surface each have a radius of curvature.

3. The method of claim 1 , wherein the at least one mineral acid is at least one of hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, boric acid, hydrobromic acid, and perchloric acid.

4. The method of claim 1 , wherein the glass article is chemically processed by contacting the first surface of the glass article with an etching solution for a treatment time of less than or equal to 360 minutes.

5. The method of claim 1 , wherein the glass article is chemically processed by contacting the first surface of the glass article with an etching solution for a treatment time of less than or equal to 90 minutes.

6. The method of claim 1 , wherein the glass article is chemically process by contacting the first surface of the glass article with an etching solution for a treatment time greater than or equal to 90 minutes and less than or equal to 360 minutes.

7. The method of claim 1 , wherein the glass article has an initial failure probability P i prior to chemical processing and a post-etching failure probability P pp after the glass article is chemically processed and P pp is less than P i .

8. The method of claim 1 , wherein each flaw in the flaw population has an initial radius of curvature r i at the tip of the flaw prior to chemical processing and a post-etching radius of curvature r pp at the tip of the flaw after chemical processing and r i ≤r pp .

9. The method of claim 1 , wherein the glass article is a glass container.

10. The method of claim 1 , wherein the glass article is a pharmaceutical package.

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

• 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

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title