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US 10,118,858 B2Granted
Strengthened glass with deep depth of compression
AssigneeCorning Incorporated
InventorsJaymin Amin, Benedict Osobomen Egboiyi, Jonathan David Pesansky, Kevin Barry Reiman, Rostislav Vatchev Roussev, Brian Paul Strines
Life of this patent
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Abstract
The strengthened glass has a 60% survival rate when dropped from a height of 80 cm in an inverted ball test and a peak load at failure of at least 10 kgf as determined by abraded ring-on-ring testing.
Claims12
A glass article, the glass article comprising a thickness t in a range from about 0.15 mm up to about 2.0 mm and a compressive region having a compressive stress CS of from about 100 MPa up to about 1200 MPa at a surface of the glass article, wherein:
- a. the compressive region extends from the surface to a depth of compression DOC, wherein DOC≥0.1·t when t<0.5 mm and DOC 50 μm when t≥0.5 mm, and wherein the compressive region has a compressive stress profile;
- b. the compressive region has a compressive stress profile having a first portion having a first slope, wherein the first slope is less than or equal to about −2 MPa/μm and greater than or equal to about −8 MPa/μm;
- and
- c. a second portion extending from the surface to a least about 3 μm and up to about 15 μm within the glass article and having a second slope, and wherein the second slope is less than or equal to −40 MPa/μm and greater than or equal to −200 MPa/μm,
- wherein the glass article that has had a surface sandblasted with abrasive material at a load of 15 psi for 5 seconds has a peak load at failure of at least about 10 kgf as determined by abraded ring-on-ring testing wherein a ratio of a diameter of a loading ring D1 to a diameter of a support ring D2 is about 0.5.
2 more elements
Dependencies are inferred from the claim text.