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US 12,577,149 B2Granted
Lithium silicate glass ceramic with easy machinability
AssigneeIvoclar Vivadent AG
InventorChristian Ritzberger
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Abstract
A lithium silicate glass ceramic having lithium metasilicate as main crystal phase and having not more than 30 wt.-% of lithium metasilicate crystals and having the following components in the amounts indicated: Component Wt.-% SiO2 71.0 to 82.0 Li2O 6.0 to 14.0 MeI2O 4.0 to 15.0 Al2O3 2.0 to 10.0 P2O5 0.5 to 7.0, wherein MeI2O is selected from Na2O, K2O, Rb2O, Cs2O and mixtures thereof, and wherein the molar ratio of SiO2 to Li2O is in the range of 2.5 to 5.0.
Claims18
A lithium silicate glass ceramic, which comprises lithium metasilicate as main crystal phase and comprises the following components in the amounts indicated:
- Component
- Wt.-%
- SiO2
- 73.1 to 80.0
- Li2O
- 6.0 to 14.0
- MeI2O
- 5.1 to 15.0
- Al2O3
- 2.0 to 10.0
- P2O5
- 0.5 to 7.0,
- wherein MeI2O is selected from Na2O, K2O, Rb2O, Cs2O and mixtures thereof,
- wherein the glass ceramic comprises 5.1 to 10.0 wt.-% K2O, and
- wherein the molar ratio of SiO2 to Li2O is in the range of 2.9 to 5.0.
12 more elements
Dependencies are inferred from the claim text.