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US 2025/0243104 A1Published application
Thermally strengthened consumer electronic glass and related systems and methods
AssigneeCorning Incorporated
InventorsPeter Joseph Lezzi, Richard Orr Maschmeyer, John Christopher Thomas, Kevin Lee Wasson
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Abstract
A strengthened cover glass or glass-ceramic sheet or article as well as processes and systems for making the strengthened glass or glass-ceramic sheet or article is provided for use in consumer electronic devices. The process comprises cooling the cover glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened cover glass sheets for use in or on consumer electronic products.
Claims20
A glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween comprising a glass material;
- wherein a surface fictive temperature Tfs measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
- wherein the glass sheet exhibits a non-dimensional surface fictive temperature parameter θs in a range from 0.20 to 0.0, where θs=(Tfs−Tanneal)/(Tsoft−Tanneal), Tanneal is an annealing point temperature of the glass sheet, and Tsoft is a softening point temperature of the glass sheet;
- wherein an average thickness between the first and second major surfaces is less than 2 mm;
- wherein areas of the first and second major surfaces are at least 2500 mm2;
- wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- and
- wherein the glass sheet further comprises a depth of compression that is greater than 12% of the average thickness.
5 more elements
A glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween comprising a glass material;
- wherein a surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
- wherein an average thickness between the first and second major surfaces is less than 2 mm;
- wherein the glass sheet has been thermally tempered so that the first and second major surfaces are under a thermally induced compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- wherein the glass sheet has a coefficient of thermal expansion from 10×10−7/° C. to 140×10−7/° C.;
- wherein stress within the glass sheet varies as a function of position relative to the first and second major surfaces, wherein the stress has a change of at least 200 MPa over a distance of less than 500 μm of the average thickness of the glass sheet;
- and
- wherein the glass sheet further comprises a depth of compression that is greater than 12% of the average thickness.
5 more elements
A glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween comprising a glass material;
- a length and a width;
- wherein surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
- wherein an average thickness between the first and second major surfaces is less than 2 mm, and the average thickness is greater than 0.1 mm;
- wherein the length is greater than or equal to the width, and the width is greater than or equal to the average thickness;
- wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- wherein the areas of the first and second major surfaces are at least 2500 mm2;
- wherein the glass sheet at the average thickness thereof exhibits an average light transmission over a wavelength range from 400 nm to 780 nm of 85% or greater;
- and
- wherein the glass sheet further comprises a depth of compression that is greater than 17% of the average thickness.
7 more elements
Dependencies are inferred from the claim text.