CPC C03C 3/097 (2013.01) [C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/087 (2013.01); C03C 3/089 (2013.01); C03C 3/091 (2013.01); C03C 3/093 (2013.01); C03C 4/18 (2013.01); C03C 21/002 (2013.01); Y10T 428/315 (2015.01)] | 4 Claims |
1. A glass article comprising:
from about 55 mol. % to about 68 mol. % SiO2;
from about 9 mol. % to about 15 mol. % Al2O3;
from about 4.5 mol % to about 12 mol. % B2O3;
from about 1 mol. % to about 7 mol. % Li2O;
from about 3 mol. % to about 12 mol. % Na2O; and
from greater than 0 mol. % to about 3 mol. % K2O, wherein R2O is a sum of a concentration of Li2O, a concentration of Na2O, and a concentration of K2O, and a ratio of R2O to a concentration of Al2O3 is less than or equal to about 1.15, the glass article having:
a softening point less than or equal to about 810° C.;
a high temperature CTE less than or equal to about 27×10−6/° C.; and
a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm after ion exchange in a salt bath comprising KNO3 in a temperature range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours, wherein at least after the ion exchange the glass article comprises greater than 0 mol. % K2O.
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