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US 12,668,529 B2Granted
Zirconia-toughened glass ceramics
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith
Life of this patent
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Abstract
ZrO2-toughened glass ceramics having high molar fractions of tetragonal ZrO2 and fracture toughness value of greater than 1.8 MPa·m1/2. The glass ceramic may also include also contain other secondary phases, including lithium silicates, that may be beneficial for toughening or for strengthening through an ion exchange process. Additional second phases may also decrease the coefficient of thermal expansion of the glass ceramic. A method of making such glass ceramics is also provided.
Claims8
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, and
- crystals of lithium disilicate;
- and
- a glass phase;
- wherein the glass-ceramic comprises a fracture toughness of from 1.8 to 10 MPa.m1/2, as measured by Chevron notch short bar method;
- and
- wherein the crystals of tetragonal zirconia and lithium disilicate comprise 60-95 wt % of the total glass-ceramic.
5 more elements
Dependencies are inferred from the claim text.