Glasses having improved toughness and scratch resistance

摘要

A silicate glass that is tough and scratch resistant. The toughness is increased by minimizing the number of non-bridging oxygen atoms in the glass. In one embodiment, the silicate glass is an aluminoborosilicate glass in which −15 mol %≦(R2O+R′O—Al2O3—ZrO2)—B2O3≦4 mol %, where R is one of Li, Na, K, Rb, and Cs, and R′ is one of Mg, Ca, Sr, and Ba.

主权项

1. A silicate glass, the silicate glass being ion exchangeable and comprising:
a. 9.39-18 mol % alumina, 6-20 mol % Na2O,and up to 9.01 mol % boron oxide; and b. at least one alkaline earth metal oxide, wherein −15 mol %≦(R2O+R′O—Al2O3 —ZrO2)—B2O3 ≦2 mol%, where R is Na and optionally one or more of Li, K, Rb, and Cs, and R′ is one or more of Mg, Ca, Sr, and Ba.