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:
about 60 mol % to about 75 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
0 mol % to about 1 mol % Na 2 O,
about 1 mol % to about 18 mol % K 2 O,
0 mol % to about 7 mol % MgO,
0 mol % to about 9 mol % CaO,
about 1 mol % to about 8 mol % SrO,
0 mol % to about 4 mol % BaO, and
about 3 mol % to about 16 mol % R′O, wherein R′O comprises the mol % of MgO, CaO,
SrO, and BaO in the composition.
2. The glass composition of claim 1 , wherein the composition comprises:
about 65 mol % to about 75 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
0 mol % to about 0.5 mol % Na 2 O,
about 2 mol % to about 13 mol % K 2 O,
0 mol % to about 7 mol % MgO,
0 mol % to about 9 mol % CaO,
about 2 mol % to about 6 mol % SrO,
0 mol % to about 1 mol % BaO, and
about 3 mol % to about 16 mol % R′O, wherein R′O comprises the mol % of MgO, CaO,
SrO, and BaO in the composition.
3. The glass composition of claim 2 , wherein the composition comprises:
about 65 mol % to about 73 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
>0 mol % to about 0.5 mol % Na 2 O,
about 2 mol % to about 13 mol % K 2 O,
0 mol % to about 7 mol % MgO,
>0 mol % to about 9 mol % CaO,
about 2 mol % to about 6 mol % SrO,
>0 mol % to about 1 mol % BaO, and
about 5 mol % to about 16 mol % R′O, wherein R′O comprises the mol % of MgO, CaO,
SrO, and BaO in the composition.
4. The glass composition of claim 1 , wherein the composition comprises:
about 60 mol % to about 75 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
0 mol % to about 1 mol % Na 2 O,
greater than 8 mol % to about 14 mol % K 2 O,
0 mol % to about 7 mol % MgO,
0 mol % to about 9 mol % CaO,
about 1 mol % to about 8 mol % SrO,
0 mol % to about 4 mol % BaO, and
about 3 mol % to about 16 mol % R′O,
wherein R′O comprises the mol % of MgO, CaO, SrO, and BaO in the composition.
5. The glass composition of claim 1 , wherein the composition comprises:
about 60 mol % to about 75 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
0 mol % to about 1 mol % Na 2 O,
about 1 mol % to about 18 mol % K 2 O,
0 mol % to about 7 mol % MgO,
0 mol % to about 9 mol % CaO,
about 1 mol % to about 8 mol % SrO,
0 mol % to about 4 mol % BaO, and
about 3 mol % to about less than 9 mol % R′O,
wherein R′O comprises the mol % of MgO, CaO, SrO, and BaO in the composition.
6. 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 about 3 mol %.
7. The glass composition of claim 1 , consisting essentially of:
about 62 mol % to about 73 mol % SiO 2 ,
8 mol % to 11 mol % Al 2 O 3 ,
8 mol % to 10 mol % B 2 O 3 ,
>0 mol % to about 0.5 mol % Na 2 O,
about 2 mol % to about 13 mol % K 2 O,
0 mol % to about 7 mol % MgO,
>0 mol % to about 9 mol % CaO,
about 2 mol % to about 6 mol % SrO,
>0 mol % to about 1 mol % BaO,
about 3 mol % to about 16 mol % R′O, wherein R′O comprises the mol % of MgO, CaO,
SrO, and BaO in the composition,
wherein the amount of each of SnO 2 , Fe 2 O 3 , or ZrO 2 is from greater than 0 to about 3 mol %, and
from 0 to about 3 mol % of TiO 2 , MnO, ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , La 2 O 3 , HfO 2 , CdO, CeO 2 , F − , Cl − , Br − , I − , or combinations thereof.
8. The glass composition of claim 1 , wherein the CTE is from about 55×10 −7 /° C. to about 120×10 −7 /° C. in a range from 20° C. to 300° C.
9. The glass composition of claim 1 , wherein the liquidus viscosity is greater than or equal to about 100 kPoise.
10. The glass composition of claim 9 , wherein the liquidus viscosity is greater than or equal to about 250 kPoise.
11. A glass laminate comprising a glass core and at least one glass clad, wherein the glass core comprises the glass compositions of claim 1 .
12. The glass laminate of claim 11 , wherein the glass composition comprises 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 about 3 mol %.
13. A device comprising the glass composition or glass laminate 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.