Opaque colored glass-ceramics comprising nepheline crystal phases
AssigneeCorning Incorporated
InventorsAdam James Ellison, Lisa Anne Moore, Taheisha Linette Werner
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Abstract
Disclosed herein are opaque glass-ceramics comprising at least one nepheline crystal phase and comprising from about 30 mol % to about 65 mol % SiO2, from about 15 mol % to about 40 mol % Al2O3, from about 10 mol % to about 20 mol % (Na2O+K2O), and from about 1 mol % to about 10 mol % (ZnO+MgO). Also disclosed herein are opaque-glass ceramics comprising at least one nepheline crystal phase and at least one spinel-structure phase doped with at least one colorant chosen from transition metals and rare earth elements. Further disclosed herein are methods for making these opaque glass-ceramics.
Claims20
An opaque glass-ceramic comprising:
- at least one nepheline crystal phase, and
- a composition comprising
- SiO2 in an amount in the range from about 30 mol % to about 65 mol %,
- Al2O3 in an amount in the range from about 15 mol % to about 40 mol %,
- Na2O and K2O present in an amount such that the total amount of Na2O and K2O (Na2O+K2O) is in the range from about 10 mol % to about 20 mol %,
- ZnO in an amount in the range from about 0 mol % to about 10 mol %, and MgO in an amount in the range from about 0 mol % to about 10 mol %, wherein the combined amount of ZnO and MgO (ZnO+MgO) is in the range from about 1 mol % to about 10 mol %
- wherein the glass-ceramic is chemically strengthened by ion exchange.
A method for making an opaque glass-ceramic comprising at least one nepheline crystal phase, the method comprising heating a precursor glass at a temperature and for a time sufficient to convert the precursor glass into a glass-ceramic, wherein the precursor glass comprises about from about 30 mol % to about 65 mol % SiO2, from about 15 mol % to about 40 mol % Al2O3, from about 10 mol % to about 20 mol % (Na2O+K2O), from about 0 mol % to about 10 mol % ZnO, and from about 0 mol % to about 10 mol % MgO, wherein the total amount of ZnO and MgO (ZnO+MgO) is in the range from about 1 mol % to about 10 mol %.
Dependencies are inferred from the claim text.