Corning Incorporated
BORON-CONTAINING GLASS COMPOSITIONS HAVING HIGH FRACTURE TOUGHNESS

Abstract:

Glass compositions including 50 mol % to 65 mol % SiO.sub.2, 13 mol % to 20 mol % Al.sub.2O.sub.3, 6 mol % or more B.sub.2O.sub.3, 0 mol % to 5 mol % MgO, 0 mol % to 2 mol % CaO, 8 mol % to 14 mol % Li.sub.2O, 0 mol % to 4 mol % Na.sub.2O, and 0 mol % to 1 mol % K.sub.2O, where Al.sub.2O.sub.3 mol %>R.sub.2O+R'O--3 mol %. The glass compositions may have a K.sub.1C value of 0.75 MPa*m.sup.1/2 or more measured by a chevron short bar method. The glass compositions may be used in a glass article or consumer electronic product.