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US 12,024,461 B2Granted
Ion exchangeable, opaque gahnite-spinel glass ceramics with high hardness and modulus
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Alexandra Lai Ching Kao Andrews Mitchell, Charlene Marie Smith
Life of this patent
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Abstract
An opaque gahnite-spinel glass ceramic is provided. The glass ceramic includes a first crystal phase including (MgxZn1-x)Al2O4 where x is less than 1 and a second crystal phase includes at least one of tetragonal ZrO2, MgTa2O6, mullite, and cordierite. The glass ceramic has a Young's modulus greater than or equal to 90 GPa, and has a hardness greater than or equal to 7.5 GPa. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.
Claims18
A method, comprising:
- ceramming a precursor glass to form a glass ceramic that is opaque in the visible range,
- wherein the glass ceramic comprises:
- a first crystal phase including (MgxZn1-x)Al2O4 where x is less than 1;
- and
- a second crystal phase consists of tetragonal ZrO2 and one or more of MgTa2O6, mullite, and cordierite;
- wherein the glass-ceramic has a Young's modulus greater than or equal to 90 GPa, and has a hardness greater than or equal to 7.5 GPa.
3 more elements
A method, comprising:
- ceramming a precursor glass to form a glass ceramic that is opaque in the visible range,
- wherein the glass ceramic comprises:
- a first crystal phase including (MgxZn1-x)Al2O4 where x is less than 1;
- and
- a second crystal phase including tetragonal ZrO2 and at least one of MgTa2O6, mullite, and cordierite;
- wherein the glass-ceramic has a Young's modulus greater than or equal to 90 GPa, and has a hardness greater than or equal to 7.5 GPa.
3 more elements
A method, comprising:
- ceramming a precursor glass to form a glass ceramic that is opaque in the visible range,
- wherein the glass ceramic comprises:
- a first crystal phase including (MgxZn1-x)Al2O4 where x is less than 1;
- and
- a second crystal phase consists of mullite and cordierite;
- wherein the glass-ceramic has a Young's modulus greater than or equal to 90 GPa, and has a hardness greater than or equal to 7.5 GPa.
3 more elements
Dependencies are inferred from the claim text.