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US 2019/0161395 A1Published application
Black lithium silicate glass ceramics
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith
Life of this patent
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Abstract
A black lithium silicate glass ceramic is provided. The glass ceramic includes lithium silicate as a primary crystal phase and at least one of petalite, β-quartz, β-spodumene, cristobalite, and lithium phosphate as a secondary crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: −1.0 to 1.0, and b*: −5.0 to 2.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.
Claims25
A glass ceramic, comprising:
- at least one lithium silicate crystal phase as a primary crystal phase;
- and
- at least one of petalite, β-quartz, β-spodumene, cristobalite, and lithium phosphate as a secondary crystal phase,
- wherein the glass ceramic is characterized by the following color coordinates:
- L*:
- 20.0 to 40.0;
- a*:
- −1.0 to 1.0;
- and
- b*:
- −5.0 to 2.0.
8 more elements
A method, comprising:
- ceramming a precursor glass-based article to form a glass ceramic,
- wherein the glass ceramic comprises:
- at least one lithium silicate crystal phase as a primary crystal phase;
- and
- at least one of petalite, β-quartz, β-spodumene, cristobalite, and lithium phosphate as a minor crystal phase, and
- the glass ceramic is characterized by the following color coordinates:
- L*:
- 20.0 to 40.0;
- a*:
- −1.0 to 1.0;
- and
- b*:
- −5.0 to 2.0.
10 more elements
A glass, comprising:
- 55.0 wt % to 75.0 wt % SiO2;
- 2.0 wt % to 20.0 wt % Al2O3;
- 0 wt % to 5.0 wt % B2O3;
- 5.0 wt % to 15.0 wt % Li2O;
- 0 wt % to 5.0 wt % Na2O;
- 0 wt % to 4.0 wt % K2O;
- 0 wt % to 8.0 wt % MgO;
- 0 wt % to 10.0 wt % ZnO;
- 0.5 wt % to 5.0 wt % TiO2;
- 1.0 wt % to 6.0 wt % P2O5;
- 2.0 wt % to 10.0 wt % ZrO2;
- 0 wt % to 0.4 wt % CeO2;
- 0.05 wt % to 0.5 wt % SnO+SnO2;
- 0.1 wt % to 5.0 wt % FeO+Fe2O3;
- 0.1 wt % to 5.0 wt % NiO;
- 0.1 wt % to 5.0 wt % Co3O4;
- 0 wt % to 4.0 wt % MnO+MnO2+Mn2O3;
- 0 wt % to 2.0 wt % Cr2O3;
- 0 wt % to 2.0 wt % CuO;
- and
- 0 wt % to 2.0 wt % V2O5.
18 more elements
Dependencies are inferred from the claim text.