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US 12,753,111 B2Granted
Zirconia-toughened glass ceramics
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith
Life of this patent
Estimating the term…
Abstract
ZrO2-toughened glass-ceramic has high molar fractions of tetragonal ZrO2 and may also include also contain other secondary phases, including lithium silicates, that may be beneficial for toughening or for strengthening through an ion-exchange. Additional secondary phases may also decrease the coefficient of thermal expansion of the glass-ceramic. A method of making such glass-ceramic is also provided.
Claims39
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, and
- crystals of lithium disilicate;
- and
- a glass phase;
- and
- wherein the crystals of tetragonal zirconia and lithium disilicate comprise 60-95 wt % of the total glass-ceramic;
- and
- wherein the tetragonal zirconia comprises a weight percent (wt %) of total zirconia in the glass-ceramic, measured as the (((weight of the tetragonal zirconia)/(total weight of zirconia in the glass-ceramic))*100), and wherein the tetragonal zirconia comprises 40-95 wt % of the total zirconia in the glass-ceramic.
6 more elements
A glass-ceramic, comprising:
- a composition in terms of representative oxides comprising:
- 58-69 mol % SiO2,
- 25-36 mol % Li2O,
- 6-15 mol % ZrO2,
- >0-5 mol % Al2O3;
- 0-5 mol % Na2O;
- 0-5 mol % B2O3;
- and
- 0.2-3 mol % P2O5;
- and
- crystalline and glass phases, the crystalline phase comprising:
- crystals of tetragonal zirconia;
- and
- crystals of lithium disilicate.
11 more elements
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, wherein an average crystal size along a longest dimension for the crystals of tetragonal zirconia is in a range from 100 nm to 10 μm;
- and
- crystals of lithium disilicate;
- and
- a glass phase;
- and
- an ion-exchanged layer having a depth of compression of at least 10 μm.
5 more elements
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, and
- crystals of lithium disilicate;
- and
- a glass phase;
- and
- wherein the crystals of tetragonal zirconia and lithium disilicate comprise 60-95 wt % of the total glass-ceramic;
- and
- wherein the lithium disilicate comprises a weight percent (wt %) of the total glass-ceramic, measured as the (((weight of the lithium disilicate)/(total weight the glass-ceramic))*100), and wherein the lithium disilicate comprises from 25-60 wt % of the total glass-ceramic.
6 more elements
A glass-ceramic, comprising:
- a composition in terms of representative oxides comprising:
- 50-80 mol % SiO2,
- 18-40 mol % Li2O,
- 1.5-25 mol % ZrO2, and
- greater than 0-5 mol % P2O5;
- and
- crystalline and glass phases, the crystalline phase comprising:
- crystals of tetragonal zirconia;
- and
- crystals of lithium disilicate;
- wherein the glass-ceramic exhibits a color presented in CIELAB color space coordinate a* of from about −1 to about +3.
8 more elements
A glass-ceramic, comprising:
- a composition in terms of representative oxides comprising:
- 50-80 mol % SiO2,
- 18-40 mol % Li2O,
- 1.5-25 mol % ZrO2, and
- greater than 0-5 mol % P2O5;
- and
- crystalline and glass phases, the crystalline phase comprising:
- crystals of tetragonal zirconia;
- and
- crystals of lithium disilicate;
- wherein the glass-ceramic exhibits a color presented in CIELAB color space coordinate b* of from about −7 to about +3.
8 more elements
A glass-ceramic, comprising:
- a composition in terms of representative oxides comprising:
- 50-80 mol % SiO2,
- 18-40 mol % Li2O,
- 1.5-25 mol % ZrO2, and
- greater than 0-5 mol % P2O5;
- and
- crystalline and glass phases, the crystalline phase comprising:
- crystals of tetragonal zirconia;
- and
- crystals of lithium disilicate;
- wherein the glass-ceramic exhibits a color presented in CIELAB color space coordinate L* of greater than 85.
8 more elements
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, and
- crystals of lithium disilicate, wherein an average crystal size along a longest dimension for the crystals of lithium disilicate is in a range from 2 μm to 20 μm;
- a glass phase;
- and
- an ion-exchanged layer having a depth of compression of at least 10 μm.
3 more elements
A glass-ceramic, comprising:
- a crystalline phase comprising:
- crystals of tetragonal zirconia, and
- crystals of lithium disilicate;
- a glass phase, where the glass phase is 1 to 50 wt % of the glass-ceramic;
- and
- an ion-exchanged layer having a depth of compression of at least 10 μm.
3 more elements
Dependencies are inferred from the claim text.