Patent ID: 11964907
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. A glass comprising components, the glass having a composition of the components comprising:
greater than or equal to 25.0 mol. % and less than or equal to 75.0 mol. % SiO2,
greater than or equal to 7.4 mol. % and less than or equal to 14.1 mol. % Al2O3,
greater than or equal to 0.0 mol. % and less than or equal to 10.0 mol. % Na2O,
greater than or equal to 0.0 mol. % and less than or equal to 7.0 mol. % Y2O3,
greater than or equal to 0 mol. % and less than or equal to 4.95 mol. % TiO2,
greater than or equal to 0.0 mol. % and less than or equal to 4.0 mol. % B2O3,
greater than or equal to 0.0 mol. % and less than or equal to 3.5 mol. % Li2O,
greater than or equal to 5.0 mol. % and less than or equal to 55.0 mol. % total of divalent metal oxides (RO), and
a sum of ZrO2+HfO2 greater than or equal to 1.5 mol. % and less than or equal to 9.5 mol. %, and
wherein the composition of the components is substantially free of fluorine, and
wherein the glass satisfies the conditions:

(R2O-Al2O3)[mol. %]≤3.0,

(SiO2-Al2O3-R2O)[mol. %]≤43.6, and

(MgO/RO)[mol. %]≥0.71,, where R2O is a total of monovalent metal oxides;
wherein the glass satisfies the conditions:

40≤Pjb≤90,, where Pjb is a value of jeffbenite formation parameter, calculated from the glass composition in terms of mol. % of the components according to the following formula:

Pjb=7*minimum of {[(SiO2+ZrO2+SnO2)/3],[(MgO+MnO+FeO)/3], or Al2O3}.