Glasses having improved toughness and scratch resistance
AssigneeCorning Incorporated
InventorsMatthew John Dejneka, Adam James Ellison, Sinue Gomez, Robert Michael Morena
Life of this patent
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Abstract
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.
Claims26
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.
An aluminoborosilicate glass, the aluminoborosilicate glass being ion exchangeable and having a toughness in a range from about 0.7 MPa m0.5 up to about 1.2 MPa m0.5 and brittleness of less than about 8.5 μμm−0.5, wherein the aluminoborosilicate glass comprises:
- 9.39-18 mol % alumina, 6-20 mol % Na2O, and up to 9.01 mol % boron oxide;
- at least one alkaline earth metal oxide R′O, where R′ is or more of Mg, Ca, Sr, and Ba;
- and at least one alkali metal oxide R2O, where R is Na and optionally one or more of Li, K, Rb, and Cs, and wherein −15 mol %≦(R2O+R′O—Al2O3—ZrO2)—B2O3 ≦2 mol %.
Dependencies are inferred from the claim text.