Back to results
US 12,441,645 B1Granted
Glass parts and gob-pressing methods for making such
AssigneeCorning Incorporated
InventorsRichard Dominic Bomba, Cyril Rémy André Dedieu, Arnaud Dominique Dejean, Allan Mark Fredholm, Anne-Claire Jeanson, David John McEnroe, Mathieu Mondésir, Galan Gregory Moore, Aniello Mario Palumbo, David Sampaio, Thomas Matthew Sonner, Joseph William Soper
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to methods and techniques for gob-pressing a glass part of challenging geometries, such as large surfaces with thin thickness as well as features positioned far from a centroid of the part.
Claims20
A method of making a glass part, comprising:
- gob-pressing glass to form the glass part, wherein the gob-pressing comprises pressing a gob of molten glass into a mold such that the gob spreads outward in the mold to form the molten glass to a shape of the glass part,
- wherein the shape comprises first and second major surfaces facing away from one another and a thickness orthogonal to the first and second major surfaces and extending therebetween, wherein the shape comprises a geometric centroid, and wherein the shape has length and width aligned with the first and second major surfaces and orthogonal to one another;
- wherein the length of the shape is greater than the width;
- wherein the first and second major surfaces each have an area of at least 4 cm2 and the thickness for at least a portion of the shape between the major surfaces is less than 2 mm;
- wherein a cross-sectional portion of the shape between the first and second major surfaces extending along a 2 cm linear path varies in thickness less than 100 μm;
- wherein the shape comprises curvature of at least a portion of surfaces thereof that comprises a radius of curvature of less than 1 m;
- wherein the glass of the glass part is an aluminosilicate, comprising in molar percentage on an oxide basis at least 40 mol % silica and no more than 80 mol % silica, and at least 2 mol % alumina and no more than 30 mol % alumina;
- wherein the glass has a dielectric constant Dk at 10 GHz less than or equal to 6.8;
- wherein the glass is configured for chemical strengthening, comprising at least 5 mol % alkali metal oxides and no more than 25 mol % of the alkali metal oxides;
- chemically strengthening the glass of the glass part, wherein the glass has a surface compressive stress and a central tension;
- and
- heat treating the glass of the glass part to grow crystals therein, wherein the crystals comprise at least 50 vol % of the glass part and no more than 99 vol %.
9 more elements
A method of making a glass part, comprising:
- gob-pressing glass to form the glass part, wherein the gob-pressing comprises pressing a gob of molten glass into a mold such that the gob spreads outward in the mold to form the molten glass to a shape of the glass part,
- wherein the shape comprises first and second major surfaces facing away from one another and a thickness orthogonal to the first and second major surfaces and extending therebetween, and wherein the shape has length and width aligned with the major surfaces and orthogonal to one another;
- wherein the first and second major surfaces each have an area of at least 4 cm2 and the thickness is less than 2 mm for at least a portion of the shape between the major surfaces;
- wherein a cross-sectional portion of the shape between the first and second surfaces extending along 2 cm linear path varies in thickness less than 100 μm;
- wherein the glass of the glass part is a silicate;
- wherein the glass has an average total transmission of greater than 40% between wavelengths of 450 nm and 650 nm through the thickness;
- wherein the thickness is a first thickness and wherein the shape comprises a second thickness that is at least twice the first thickness;
- and
- heat treating the glass, subsequent to the gob-pressing, to grow crystals therein;
- wherein the crystals are distributed within the glass of the glass part, and wherein a volume percent of crystals is less than 95% of the glass part;
- and
- wherein fracture toughness of the glass part is 1.0 MPa·m1/2 or more.
9 more elements
A method of making a glass part, comprising:
- gob-pressing glass to form the glass part, wherein the gob-pressing comprises pressing a gob of molten glass into a mold such that the gob spreads outward in the mold to form the molten glass to a shape of the glass part,
- wherein the shape comprises first and second major surfaces facing away from one another and a thickness orthogonal to the first and second major surfaces and extending therebetween, and wherein the shape has length and width aligned with the first and second major surfaces and orthogonal to one another;
- wherein the first and second major surfaces each have an area of at least 4 cm2 and the thickness for at least a portion of the shape between the major surfaces is less than 2 mm;
- wherein the thickness for the portion of the shape is a first thickness and wherein the shape comprises a second thickness that is greater than the first thickness;
- wherein a cross-sectional portion of the shape between the first and second major surfaces extending along a 2 cm linear path varies in thickness less than 100 μm;
- wherein the length of the shape is greater than the width;
- wherein glass of the glass part is an aluminosilicate, comprising in molar percentage on an oxide basis at least 40 mol % silica and no more than 80 mol % silica, and at least 2 mol % alumina and no more than 30 mol % alumina;
- wherein the glass has a dielectric constant Dk at 10 GHz less than or equal to 6.8;
- wherein the glass comprises one or more colorants selected from the group consisting of Au, Ag, Cr2O3, transition metal oxides, rare earth metal oxides;
- and
- heat treating the glass of the glass part to grow crystals therein;
- wherein the crystals are distributed within the glass of the glass part, and wherein a volume percent of crystals is less than 95% of the glass part;
- and
- wherein fracture toughness of the glass part is 1.0 MPa·m1/2 or more.
11 more elements
Dependencies are inferred from the claim text.