US 2017/0247287 A1 · GLASS ARTICLES AND METHODS FOR IMPROVING THE RELIABILITY OF GLASS ARTICLES

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.

Claims20

Dependent claims

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;
and
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.

2 more elements

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 Ti extending from the first surface to the second surface, and a flaw population with a maximum initial flaw depth Ai extending from the first surface into the initial thickness Ti;
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 Ai remain in the glass article and have a post-processing stress concentration factor Ktpp at a tip of the flaw which is less than an initial stress concentration factor Kti at the tip of the flaw prior to chemical processing;
the flaw population has a maximum post-processing flaw depth App which is substantially equal to Ai;
a post-processing thickness Tpp of the glass article is less than the initial thickness Ti;
and
|Tpp−Ti| is substantially equal to |App−Ai|.

4 more elements

Dependencies are inferred from the claim text.

Glass articles and methods for improving the reliability of glass articles

Life of this patent

Glass articles and methods for improving the reliability of glass articles

Life of this patent

Abstract

Claims20