Intermediate thermal expansion coefficient glass
Aluminoborosilicate glasses which may be useful in photovoltaic, photochromic, electrochromic, or Organic Light Emitting Diode (OLED) lighting applications are described.
1. A glass comprising, in mole percent:
60 to 65 percent SiO 2 ;
8 to 12 percent Al 2 O 3 ;
7 to 15 percent B 2 O 3 ;
0.1 to 8 percent M 2 O;
9 to 15 percent RO; and
0.01 to 0.4 percent SnO 2 ,
wherein, M is an alkali metal and wherein, R is an alkaline earth metal.
2. The glass according to claim 1 , comprising, in mole percent:
61 to 64 percent SiO 2 ;
8 to 12 percent Al 2 O 3 ;
9 to 15 percent B 2 O 3 ;
0.1 to 4 percent M 2 O; and
12 to 15 percent RO;
wherein, M is an alkali metal and wherein, R is an alkaline earth metal.
3. The glass according to claim 1 , comprising, in mole percent:
60 to 65 percent SiO 2 ;
8 to less than 10 percent Al 2 O 3 ;
greater than 11 to 15 percent B 2 O 3 ;
0.1 to less than 1 percent M 2 O; and
9 to 15 percent RO;
wherein, M is an alkali metal and wherein, R is an alkaline earth metal.
4. The glass according to claim 1 , comprising, in mole percent:
60 to 65 percent SiO 2 ;
10 to 12 percent Al 2 O 3 ;
7 to 11 percent B 2 O 3 ;
1 to 8 percent M 2 O; and
9 to 15 percent RO;
wherein, M is an alkali metal and wherein, R is an alkaline earth metal.
5. The glass according to claim 1 , wherein M is selected from Li, Na, K, Rb, Cs, and a combination thereof.
6. The glass according to claim 5 , wherein M is selected from Li, K, Cs and a combination thereof.
7. The glass according to claim 1 , wherein R is selected from Mg, Ca, Sr, Ba, and a combination thereof.
8. The glass according to claim 7 , wherein R is selected from Mg, Ca, Sr, and a combination thereof.
9. The glass according to claim 1 , comprising 62 to 65 percent SiO 2 .
10. The glass according to claim 1 , comprising:
62 to 65 percent SiO 2 ;
10 to 12 percent Al 2 O 3 ;
7 to 11 percent B 2 O 3 ;
3 to 8 percent MgO;
3 to 9 percent CaO;
3 to 8 percent SrO; and
1 to 8 percent M 2 O;
wherein, M is an alkali metal selected from K, Na, and combinations thereof.
11. The glass according to claim 1 , wherein the glass is down-drawable.
12. The glass according to claim 1 , wherein the glass is slot drawn or fusion drawn.
13. The glass according to claim 1 , wherein the glass is float formed.
14. The glass according to claim 1 , wherein the glass is substantially free of BaO.
15. The glass according to claim 1 , wherein the glass is substantially free of Sb 2 O 3 , As 2 O 3 , or combinations thereof.
16. The glass according to claim 1 , wherein the glass is ion exchanged in a salt bath comprising one or more salts of alkali metal ions.
17. The glass according to claim 1 , further comprising 2 mole percent or less 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 , P 2 O 5 , or combinations thereof.
18. The glass according to claim 1 , having a strain point of 600° C. or greater.
19. The glass according to claim 1 , having a coefficient of thermal expansion of 38×10 −7 /° C. or greater.
20. The glass according to claim 1 , having a coefficient of thermal expansion of 45×10 −7 /° C. or greater.
21. The glass according to claim 1 , having a strain point of 620° C. or greater and a coefficient of thermal expansion of 45×10 −7 /° C. or greater.
22. The glass according to claim 1 , having a liquidus viscosity of 50,000 poise or greater.
23. The glass according to claim 22 , having a liquidus viscosity of 150,000 poise or greater.
24. The glass according to claim 1 , wherein CaO/(CaO +SrO) is from 0.4 to 1.
25. The glass according to claim 1 , wherein the glass is in the form of a sheet.
26. The glass according to claim 25 , wherein the glass is thermally tempered.
27. An Organic Light Emitting Diode device comprising the glass according to claim 25 .
28. A photovoltaic device comprising the glass according to claim 25 .
29. The photovoltaic device according to claim 28 , further comprising an active photovoltaic medium adjacent to the glass.
30. The photovoltaic device according to claim 29 , wherein the active photovoltaic medium comprises cadmium telluride, copper indium gallium diselenide, amorphous silicon, crystalline silicon, microcrystalline silicon, or combinations thereof.