Corning Incorporated
Ion exchangeable glass with fast diffusion

Abstract:

Glasses that undergo rapid ion exchange. The glasses comprise SiO.sub.2, Al.sub.2O.sub.3, P.sub.2O.sub.5, Na.sub.2O, K.sub.2O, and, in some embodiments, at least one of MgO and ZnO. The glass may, for example, be ion exchanged in a molten KNO.sub.3 salt bath in less than 1 hour at temperatures in a range from about 370.degree. C. to about 390.degree. C. to achieve a depth of surface compressive layer of greater than about 45 microns, or in a range from about 0.05t to about 0.22t, where t is the thickness of the glass. The glasses are fusion formable and, in some embodiments, compatible with zircon.