High strength glass-ceramics having petalite and lithium silicate structures
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith
Life of this patent
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Abstract
In embodiments, a precursor glass composition comprises from about 55 wt. % to about 80 wt. % SiO2; from about 2 wt. % to about 20 wt. % Al2O3; from about 5 wt. % to about 20 wt. % Li2O; greater than 0 wt % to about 3 wt. % Na2O; a non-zero amount of P2O5 less than or equal to 4 wt. %; and from about 0.2 wt. % to about 15 wt. % ZrO2. In embodiments, ZrO2 (wt. %)+P2O5 (wt. %) is greater than 3. When the precursor glass composition is converted to a glass-ceramic article, the glass-ceramic article may include grains having a longest dimension of less than 100 nm.
Claims18
A glass-ceramic article comprising:
- from about 55 wt. % to about 80 wt. % SiO2;
- greater than 6 wt. % to 10 wt. % Al2O3;
- greater than 12 wt. % to about 20 wt. % Li2O;
- 1 wt % to about 3 wt. % Na2O;
- a non-zero amount of P2O5 less than or equal to 5 wt. %;
- and
- from about 0.2 wt. % to about 15 wt. % ZrO2, wherein:
- ZrO2 (wt. %)+P2O5 (wt. %) is greater than 3;
- the glass-ceramic article has an average transmittance greater than 85% over the wavelength range from 400 nm to 1000 nm for a glass-ceramic article thickness of 1 mm;
- and
- the glass-ceramic article comprises grains and the grains have a longest dimension of less than 100 nm.
A glass-ceramic article comprising:
- from about 55 wt. % to about 80 wt. % SiO2;
- from about 2 wt. % to 10 wt. % Al2O3;
- greater than 10 wt. % to about 20 wt. % Li2O;
- greater than 0 wt % to about 3 wt. % Na2O;
- a non-zero amount of P2O5 less than or equal to 4 wt. %;
- and
- from about 0.2 wt. % to about 15 wt. % ZrO2, wherein:
- ZrO2 (wt. %)+P2O5 (wt. %) is greater than 3;
- the glass-ceramic article comprises a petalite crystalline phase;
- and
- the glass-ceramic article has an average transmittance greater than 85% over the wavelength range from 400 nm to 1000 nm for a glass-ceramic article thickness of 1 mm.
Dependencies are inferred from the claim text.