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
Glass and glass ceramic compositions having a combination of lithium silicate and petalite crystalline phases along with methods of making the glass and glass ceramic compositions are described. The compositions are compatible with conventional rolling and float processes, are transparent or translucent, and have high mechanical strength and fracture resistance. Further, the compositions are able to be chemically tempered to even higher strength glass ceramics that are useful as large substrates in multiple applications.
Claims35
A glass-ceramic article comprising:
- a petalite crystalline phase;
- and
- a lithium silicate crystalline phase,
- wherein the petalite crystalline phase and the lithium silicate crystalline phase have higher weight percentages than other crystalline phases present in the glass-ceramic article.
A method of forming a glass-ceramic article, the method comprises:
- forming a glass composition comprising, in wt %:
- SiO2:
- 55-80%;
- Al2O3:
- 2-20%;
- Li2O:
- 5-20%;
- B2O3:
- 0-10%;
- Na2O:
- 0-5%;
- ZnO:
- 0-10%;
- P2O5:
- 0.5-6%;
- and
- ZrO2:
- 0.2-15%;
- and
- ceramming the glass composition to form a glass-ceramic article comprising a petalite crystalline phase and a lithium silicate crystalline phase, wherein the petalite crystalline phase and the lithium silicate crystalline phase have higher weight percentages than other crystalline phases present in the glass-ceramic article.
Dependencies are inferred from the claim text.