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US 2019/0375679 A1Published application
Fracture resistant stress profiles in glasses
AssigneeCorning Incorporated
InventorsTimothy Michael Gross, Xiaoju Guo, Jason Thomas Harris, Peter Joseph Lezzi, Alexandra Lai Ching Kao Andr Mitchell, Pascale Oram, Kevin Barry Reiman, Rostislav Vatchev Roussev, Ljerka Ukrainczyk
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Abstract
Glass-based articles comprise stress profiles providing improved fracture resistance. The glass-based articles herein provide high fracture resistance after multiple drops.
Claims23
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t), wherein t is greater than or equal to 0.4 mm and less than or equal to 1.3 mm;
- and
- a stress profile comprising:
- a depth of compression (DOC) that is greater than or equal to 0.15 t;
- a stress slope at DOC that is 1.5 MPa/micron or less;
- and
- an absolute value of stress integral in one compression zone that is in the range of from 4 MPa*mm to 20 MPa*mm.
4 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass-based article to a depth of compression (DOC);
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 500 MPa, a thickness (t) of less than or equal to 0.73 mm, a compressive stress at a knee (CSk) greater than or equal to 140 MPa, and a DOC/t greater than 0.17.
2 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass-based article to a depth of compression (DOC);
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 970 MPa, a compressive stress at a knee (C Sk) greater than or equal to 90 MPa, and a DOC/t greater than or equal to 0.17.
2 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass article to a depth of compression (DOC),
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 970 MPa, a compressive stress at a knee (C Sk) greater than or equal to 80 MPa, a DOC/t greater than or equal to 0.17, and a depth of layer of a spike (DOLsp) greater than or equal to 0.012 t.
2 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass article to a depth of compression (DOC),
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 970 MPa, a compressive stress at a knee (CSk) greater than or equal to 50 MPa, a DOC/t greater than or equal to 0.17, and a depth of layer of a spike (DOLsp) greater than or equal to 0.02 t.
2 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass article to a depth of compression (DOC),
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 500 MPa, a depth of layer of a spike (DOLsp) greater than or equal to 0.008 ·t, a stress profile including a low slope region with an average absolute value of a slope less than or equal to 0.2 MPa/μm, the low slope region is located in the compressive stress layer and extends for at least 10 μm, and the average compressive stress in the low slope region is greater than or equal to 80 MPa.
2 more elements
A glass-based article, comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium;
- and
- a compressive stress layer extending from a surface of the glass article to a depth of compression (DOC),
- wherein the glass-based article comprises a peak compressive stress (CS) greater than or equal to 500 MPa, a depth of layer of a spike (DOLsp) greater than or equal to 0.008 t, a stress profile comprising a negative curvature region where a second derivative of stress as a function of depth is negative, the negative curvature region is located in the compressive stress layer, and a maximum absolute value of the second derivative in the negative curvature region is greater than or equal to 0.003 MPa/m2.
2 more elements
A glass-based article comprising:
- a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t);
- a central composition at the center of the glass-based article comprising lithium and a Li2O/Na2O molar ratio of greater than or equal to 0.65 and less than or equal to 1.2;
- and
- a stress profile comprising a negative curvature region, wherein a second derivative of stress as a function of depth is negative, the negative curvature region is located in a compressive stress layer, and a maximum absolute value of the second derivative in the negative curvature region being greater than or equal to 0.003 MPa/μm2.
1 more element
A method of increasing probability of survival after multiple drops of a glass-based article onto one or more hard surfaces comprising:
- exposing to an ion exchange treatment a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t) to form a glass-based article with a stress profile comprising a knee, the glass-based article comprising:
- a central composition at the at the center of the glass-based article comprising lithium and a Li2O/Na2O molar ratio of greater than or equal to 0.65 and less than or equal to 1.2;
- an alkali metal oxide comprising a non-zero concentration that varies from the first surface to a depth of layer (DOL) with respect to the alkali metal oxide;
- and
- a fracture toughness corresponding to the central composition in the range of greater than or equal to 0.7 MPa*sqrt(m) to less than or equal to 1.3 MPa*sqrt(m).
2 more elements
Dependencies are inferred from the claim text.