High strength glass having improved mechanical characteristics
First Claim
Patent Images
1. A thermally strengthened glass sheet:
- the glass sheet having a thickness, expressed in millimeters, of t, a length, expressed in millimeters, of l, and a width, expressed in millimeters, of w, t being less than l and less than w;
the glass sheet having a first major surface and a second major surface separated by the thickness t;
the glass sheet comprising a glass having a low temperature linear CTE, expressed in 1/°
C., of α
SCTE, a high temperature linear CTE, expressed in 1/°
C., of α
LCTE, an elastic modulus, expressed in GPa, of E, a strain temperature, expressed in units of °
C., of Tstrain, and a softening temperature, expressed in units of °
C., of Tsoft;
the first major surface of the glass sheet having a thermally induced surface compressive stress of less than 600 MPa and greater than
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Abstract
A strengthened glass sheet product along with a process and an apparatus for strengthening a glass sheet are provided. The process comprises cooling the 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 glass sheets having improved breakage properties.
161 Citations
37 Claims
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1. A thermally strengthened glass sheet:
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the glass sheet having a thickness, expressed in millimeters, of t, a length, expressed in millimeters, of l, and a width, expressed in millimeters, of w, t being less than l and less than w; the glass sheet having a first major surface and a second major surface separated by the thickness t; the glass sheet comprising a glass having a low temperature linear CTE, expressed in 1/°
C., of α
SCTE, a high temperature linear CTE, expressed in 1/°
C., of α
LCTE, an elastic modulus, expressed in GPa, of E, a strain temperature, expressed in units of °
C., of Tstrain, and a softening temperature, expressed in units of °
C., of Tsoft;the first major surface of the glass sheet having a thermally induced surface compressive stress of less than 600 MPa and greater than - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification