High strength glass-ceramics having petalite and lithium silicate structures
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith
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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.
Claims20
An electronic device covering, comprising:
- a microstructure of randomly-oriented interlocked crystals;
- 20 to 60 wt % lithium silicate crystalline phase;
- 20 to 70 wt % petalite crystalline phase;
- a fracture toughness of 1 MPa·m1/2 or greater;
- a ring-on-ring strength of at least 300 MPa.
Dependencies are inferred from the claim text.