Down-drawable, chemically strengthened glass for cover plate
AssigneeCorning Incorporated
InventorsAdam James Ellison, Sinue Gomez
Life of this patent
Estimating the term…
Abstract
An alkali aluminosilicate glass that is chemically strengthened and has a down-drawable composition. The glass has a melting temperature less than about 1650° C. and a liquidus viscosity of at least 130 kpoise and, in one embodiment, greater than 250 kpoise. The glass undergoes ion exchange at relatively low temperatures to a depth of at least 30 μm.
Claims75
An alkali aluminosilicate glass, the glass comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- (Na2O+B2O3)—Al2O3≦2 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
A lithium-free glass having a surface compressive stress of at least about 200 MPa, a surface compressive layer having a depth of at least in a range from about 30 40 μm up to about 100 μm, and a thicknessof thickness of at least about 0.3 mm.
A mobile electronic device, the mobile electronic device comprising an alkali aluminosilicate glass cover plate, the glass cover plate comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- (Na2O+B2O3)—Al2O3≦2 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
An alkali aluminosilicate glass cover plate, the cover plate comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- (Na2O+B2O3)—Al2O3≦2 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
An alkali aluminosilicate glass, the glass comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
A mobile electronic device, the mobile electronic device comprising an alkali aluminosilicate glass cover plate, the glass cover plate comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
An alkali aluminosilicate glass cover plate, the cover plate comprising:
- 64 mol %≦SiO2≦68 mol %;
- 12 mol %≦Na2O≦16 mol %;
- 8 mol %≦Al2O3≦12 mol %;
- 0 mol %≦B2O3≦3 mol %;
- 2 mol %≦K2O≦5 mol %;
- 4 mol %≦MgO≦6 mol %;
- and 0 mol %≦CaO≦5 mol %, wherein:
- 66 mol %≦SiO2+B2O3+CaO≦69 mol %;
- Na2O+K2O+B2O3+MgO+CaO+SrO>10 mol %;
- 5 mol %≦MgO+CaO+SrO≦8 mol %;
- 2 mol %≦Na2O—Al2O3≦6 mol %;
- and 4 mol %≦(Na2O+K2O)—Al2O3≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.
A glass substantially free of lithium having a surface compressive stress of at least about 200 MPa, a surface compressive layer having a depth of at least in a range from 40 μm up to about 100 μm, and a thickness of at least about 0.3 mm.
Dependencies are inferred from the claim text.