Intermediate to high CTE glasses and glass articles comprising the same
Intermediate to high CTE glass compositions and laminates formed from the same are described. The glasses described herein have properties, such as liquidus viscosity or liquidus temperature, which make them particularly well suited for use in fusion forming processes, such as the fusion down draw process and/or the fusion lamination process. Further, the glass composition may be used in a laminated glass article, such as a laminated glass article formed by a fusion laminate process, to provide strengthened laminates via clad compression as a result of CTE mismatch between the core glass and clad glass.
1. A glass composition comprising:
63 mol % to 73 mol % SiO 2 ,
5 mol % to 11 mol % Al 2 O 3 ,
4 mol % to 8 mol % B 2 O 3 ,
0 mol % to 1 mol % Na 2 O,
5 mol % to 13 mol % K 2 O,
0 mol % to 4 mol % MgO,
2 mol % to 9 mol % CaO,
2 mol % to 7 mol % SrO,
0 mol % to 5 mol % BaO, and
4 mol % to 16 mol % R′O,
wherein R′O comprises the sum of the mol % of MgO, CaO, SrO, and BaO in the composition.
2. The glass composition of claim 1 , wherein the composition comprises >0 to 4 mol % MgO.
3. The glass composition of claim 2 , wherein the composition comprises 1 to 3 mol % MgO.
4. The glass composition of claim 1 , wherein the composition comprises 2 to 5 mol % CaO.
5. The glass composition of claim 1 , wherein the composition comprises 5 to 9 mol % CaO.
6. The glass composition of claim 1 , wherein the composition comprises >0 to 1 mol % Na 2 O.
7. The glass composition of claim 1 , wherein the composition comprises 5 to 10 mol % K 2 O.
8. The glass composition of claim 1 , further comprising one or more of SnO 2 , Fe 2 O 3 , or ZrO 2 , wherein when present, the amount of each of SnO 2 , Fe 2 O 3 , or ZrO 2 is from greater than 0 to 3 mol %.
9. The glass composition of claim 1 , wherein the CTE is from 55×10 −7 /° C. to 120×10 −7 /° C. in a range from 20° C. to 300° C.
10. The glass composition of claim 1 , wherein the liquidus viscosity is greater than or equal to 100 kPoise.
11. The glass composition of claim 1 , wherein the liquidus viscosity is greater than or equal to 250 kPoise.
12. A glass laminate comprising a glass core and at least one glass clad, wherein the glass core comprises the glass compositions of claim 1 .
13. A device comprising the glass composition of claim 1 as a cover glass or glass backplane in a consumer or commercial electronic device, including LCD and LED displays, computer monitors, automated teller machines (ATMs), for touch screen or touch sensor applications, for portable electronic devices including mobile telephones, personal media players, and tablet computers, for photovoltaic applications, for architectural glass applications, for automotive or vehicular glass applications, or for commercial or household appliance applications.
14. A glass composition consisting essentially of:
63 mol % to 73 mol % SiO 2 ,
5 mol % to 11 mol % Al 2 O 3 ,
4 mol % to 8 mol % B 2 O 3 ,
0 mol % to 1 mol % Na 2 O,
5 mol % to 13 mol % K 2 O,
0 mol % to 4 mol % MgO,
2 mol % to 9 mol % CaO,
2 mol % to 7 mol % SrO,
0 mol % to 5 mol % BaO, and
4 mol % to 16 mol % R′O,
>0 mol % to 3 mol % of one or more of each of SnO 2 , Fe 2 O 3 , or ZrO 2 , and
from 0 to 3 mol % of one or more of TiO 2 , MnO, ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , ZrO 2 , Y 2 O 3 , La 2 O 3 , HfO 2 , CdO, CeO 2 , Fe 2 O 3 , halogens, or combinations thereof;
wherein R′O comprises the sum of the mol % of MgO, CaO, SrO, and BaO in the composition.
15. The glass composition of claim 14 , wherein the mol % of MgO is from >0 to 4 mol %.
16. The glass composition of claim 14 , wherein the mol % of MgO is from 1 to 3 mol %.
17. The glass composition of claim 14 , wherein the mol % of CaO is from 2 to 5 mol %.
18. The glass composition of claim 14 , wherein the mol % of CaO is from 5 to 9 mol %.
19. The glass composition of claim 14 , wherein the mol % of Na 2 O is from >0 to 1 mol %.
20. The glass composition of claim 14 , wherein the mol % of K 2 O is from 5 to 10 mol %.
21. A device comprising the glass composition of claim 14 as a cover glass or glass backplane in a consumer or commercial electronic device, including LCD and LED displays, computer monitors, automated teller machines (ATMs), for touch screen or touch sensor applications, for portable electronic devices including mobile telephones, personal media players, and tablet computers, for photovoltaic applications, for architectural glass applications, for automotive or vehicular glass applications, or for commercial or household appliance applications.