High strain point glasses
AssigneeCorning Incorporated
InventorsBruce G. Aitken, Matthew J. Dejneka, Adam J. G. Ellison, Thomas E. Paulson
Life of this patent
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Abstract
A family of glasses from the rare earth alumino-silicate (RE2O3—Al2O3—SiO2) ternary system exhibiting high strain point and low liquidus temperatures; preferably the La2O3—Al2O3—SiO2 ternary system. The glasses are excellent candidates for electronics applications and have the following composition, expressed in mole percent and calculated from the glass batch on an oxide basis: 60-85% SiO2, 10-25% Al2O3, and 4-15% RE2O3.
Claims23
A substrate for a flat panel display device comprising a rare earth aluminosilicate glass exhibiting a strain point greater than approximately 650° C., a liquidus temperature less than approximately 1300° C., the glass comprising the following composition when calculated in mole percent and calculated from the batch on an oxide basis:
- 60-75%SiO2
- 10.6-20% Al2O3
- 2-15%RE2O3
- the RE being a rare earth selected from group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and mixtures thereof;
- and
- 1-12% of one or more RO, wherein R is an alkaline earth metal selected from the group consisting of Mg, Ca, Sr, or any combination thereof;
- or when R is Ba, at least one additional alkaline earth metal selected from the group consisting of Mg, Ca, and Sr is present;
- 0-9% B2O3;
- and
- 0-2% SnO2,
- wherein the composition does not contain TiO2 and Ta2O5 either individually or in any combination thereof.
A rare earth aluminosilicate glass exhibiting a strain point greater than approximately 650° C., a liquidus temperature less than approximately 1300° C., the glass comprising the following composition as calculated in a mole percent on an oxide basis:
- 65-75% SiO2
- 10.6-20% Al2O3
- 2-15% RE2O3
- the RE being a rare earth selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof;
- and
- 1-12% of one or more RO, wherein R is an alkaline earth metal selected from the group consisting of Mg, Ca, r, or any combination thereof;
- or when R is Ba, at least one additional alkaline earth metal selected from the group consisting of Mg, Ca, and Sr is presented;
- 0-9% B2O3;
- and
- 0-2% SnO2,
- wherein the composition does not contain TiO2 and Ta2O5 either individually or in any combination thereof.
A rare earth aluminosilicate glass exhibiting a strain point greater than approximately 650° C., a liquidus temperature less than approximately 1300° C., the glass consisting of the following composition as calculated in a mole percent on an oxide basis:
- 60-75% SiO2
- 10-20% Al2O3
- 2-12.49% RE2O3
- the RE being a rare earth selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof;
- and
- 1-12% of one or more RO, wherein R is an alkaline earth metal selected from the group consisting of Mg, Ca, and Sr;
- or when R is Ba, at least one additional alkaline earth metal, selected from the group consisting of Mg, Ca, and Sr is present;
- 0-9% B2O3;
- and
- 0-2% SnO2.
Dependencies are inferred from the claim text.