Corning Incorporated
Ion exchangeable glass containing boron and phosphorous

Abstract:

Ion exchangeable glasses containing SiO.sub.2, Al.sub.2O.sub.3, Na.sub.2O, MgO, B.sub.2O.sub.3, and P.sub.2O.sub.5 are provided. The compressive stresses of these ion exchanged glasses are greater than 900 megapascals (MPa) at a depth of 45 or 50 microns (.mu.m) with some glasses exhibiting a compressive stress of at least 1 gigaPascals (GPa). The ion exchange rates of these glasses are much faster than those of other alkali aluminosilicate glasses and the ion exchanged glass is resistant damage to impact damage. A method of ion exchanging the glass is also provided.