Ion exchangeable glasses having high fracture toughness

Abstract

A glass composition includes greater than or equal to 60 mol % to less than or equal to 66 mol % SiO2, greater than or equal to 14 mol % to less than or equal to 16 mol % Al2O3, greater than or equal to 7 mol % to less than or equal to 9 mol % Li2O, greater than or equal to 4 mol % to less than or equal to 6 mol % Na2O, greater than or equal to 0.5 mol % to less than or equal to 3 mol % P2O5, greater than or equal to 0.5 mol % to less than or equal to 6 mol % B2O3; and greater than 0 mol % to less than or equal to 1 mol % TiO2. The glass composition may have a fracture toughness of greater than or equal 0.75 MPa√m. A glass composition includes SiO2, Al2O3, Li2O, Na2O, P2O5, and B2O3, wherein a molar ratio of Li2O/Na2O is greater than or equal to 1.2 to less than or equal to 2.0, the glass has a liquidus viscosity in the range from greater than or equal to 50 kP to less than or equal to 75 kP, and the glass has a KIC fracture toughness greater than or equal to 0.75 MPa·m0.5. The glass composition is chemically strengthenable. The glass composition may be used in a glass-based article or a consumer electronic product.

Dependencies are inferred from the claim text.