초록 ▼

An alkali-free aluminoborosilicate glass having a coefficient of thermal expansion α20/300 of between 2. 8×10-6/K and 3.8×10-6/K, which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO 2)>58-65, boric oxide (B2O3)>6-11.5, magnesium oxide (MgO) 4-8, bar

An alkali-free aluminoborosilicate glass having a coefficient of thermal expansion α20/300 of between 2. 8×10-6/K and 3.8×10-6/K, which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO 2)>58-65, boric oxide (B2O3)>6-11.5, magnesium oxide (MgO) 4-8, barium oxide (BaO) 0-<0.5, zinc oxide (ZnO) 0-2 and aluminum oxide (Al2O3)>14-25, calcium oxide (CaO) 0-8, strontium oxide (SrO) 2.6-<4, with barium oxide (BaO)+ strontium oxide (SrO)>3, or aluminum oxide (Al2O3) >14-25, calcium oxide (CaO) 0-<2, strontium oxide (SrO)>0.5-< 4, or aluminum oxide (Al2O3)>21-25, calcium oxide (CaO) 0-8, strontium oxide (SrO)>2.6-<8, with barium oxide (BaO)+ strontium oxide (SrO)>3, and which is highly suitable for use as a substrate glass both in display technology and in thin-film photovoltaics.

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What is claimed is: 1. A glass comprising: a substantially alkali-free aluminoborosilicate glass; said glass having the composition (in % by weight, based on oxide): SiO2 >58-65 B2O3 >6-11.5 Al2O3 >14-25 MgO 4-8 CaO 0-8 SrO 2.6-<4 BaO 0-<0.5

What is claimed is: 1. A glass comprising: a substantially alkali-free aluminoborosilicate glass; said glass having the composition (in % by weight, based on oxide): SiO2 >58-65 B2O3 >6-11.5 Al2O3 >14-25 MgO 4-8 CaO 0-8 SrO 2.6-<4 BaO 0-<0.5 with SrO + BaO >3 ZnO 0-2; said composition of said SiO2, said B2O 3, said Al2O3, said MgO, said CaO, said SrO, said BaO, said SrO+BaO, and said ZnO being selected to provide all of (i.), (ii.), (iii.), and (iv.), wherein (i.), (ii.), (iii.), and (iv.) comprise: (i.) a coefficient of thermal expansion α20/300 of between 2.8×10-6/K and 3.8×10-6/K; (ii.) a glass transition temperature, Tg, of more than 700 degrees Celsius to maximize heat resistance of said glass; (iii.) a temperature at a viscosity of 102 dPas of at most 1694 degrees Celsius; and (iv.) a processing temperature, VA, at a viscosity of 104 dPas of at most 1273 degrees Celsius. 2. The glass according to claim 1, wherein said glass comprises one of (a.), (b.), and (c.): (a.) more than 18% by weight of Al2O3; (b.) at least 20.5% by weight of Al2O3; and (c.) at least 21% by weight of Al2O3. 3. The glass according to claim 2, wherein said glass comprises more than 8% by weight of B2O3. 4. The glass according to claim 3, wherein said glass additionally comprises (in % by weight): ZrO2 0-2 TiO2 0-2 with ZrO2 + TiO2 0-2 As2O3 0-1.5 Sb2O3 0-1.5 SnO2 0-1.5 CeO2 0-1.5 Cl- 0-1.5 F- 0-1.5 SO42- 0-1.5 with As2O3 + Sb2O3 + SnO2 + CeO2 + Cl- + F- + SO42- 0-1.5. 5. The glass according to claim 4, wherein: said glass is free of arsenic oxide and antimony oxide, apart from unavoidable impurities; and said glass comprises a float glass. 6. The glass according to claim 5, wherein said glass has a coefficient of thermal expansion α20/300 of between 2. 8×10-6/K and 3.6×10-6/K and a density, ρ, of <2. 600 g/cm3. 7. The glass according to claim 6, wherein said glass comprises a glass substrate for one of display technology and thin-film photovoltaics. 8. A glass comprising: a substantially alkali-free aluminoborosilicate glass; said glass having the composition (in % by weight, based on oxide): SiO2 >58-65 B2O3 >6-11.5 Al2O3 >14-25 MgO 4-8 CaO 0-<2 SrO >0.5-<4 BaO 0-<0.5 ZnO 0-2; said composition of said SiO2, said B2O 3, said Al2O3, said MgO, said CaO, said SrO, said BaO, and said ZnO being selected to provide all of (i.), (ii.), (iii.), and (iv.), wherein (i.), (ii.), (iii.), and (iv.) comprise: (i.) a coefficient of thermal expansion α20/300 of between 2.8×10-6/K and 3.4×10-6/K; (ii.) a glass transition temperature, Tg, of more than 700 degrees Celsius to maximize heat resistance of said glass; (iii.) a temperature at a viscosity of 102 dPas of at most 1694 degrees Celsius; and (iv.) a processing temperature, VA, at a viscosity of 104 dPas of at most 1273 degrees Celsius. 9. The glass according to claim 8, wherein said glass comprises one of (a.), (b.), and (c.): (a.) more than 18% by weight of Al2O3; (b.) at least 20.5% by weight of Al2O3; and (c.) at least 21% by weight of Al2O3. 10. The glass according to claim 9, wherein said glass comprises more than 8% by weight of B2O3. 11. The glass according to claim 10, wherein said glass additionally comprises (in % by weight): ZrO2 0-2 TiO2 0-2 with ZrO2 + TiO2 0-2 As2O3 0-1.5 Sb2O3 0-1.5 SnO2 0-1.5 CeO2 0-1.5 Cl- 0-1.5 F- 0-1.5 SO42- 0-1.5 with As2O3 + Sb2O3 + SnO2 + CeO2 + Cl- + F- + SO42- 0-1.5. 12. The glass according to claim 11, wherein: said glass is free of arsenic oxide and antimony oxide, apart from unavoidable impurities; and said glass comprises a float glass. 13. The glass according to claim 12, wherein said glass has a coefficient of thermal expansion α20/300 of between 2. 8×10-6/K and 3.6×10-6/K and a density, ρ, of <2. 600 g/cm3. 14. The glass according to claim 13, wherein said glass comprises a glass substrate for one of display technology and thin-film photovoltaics. 15. A glass comprising: a substantially alkali-free aluminoborosilicate glass; said glass having the composition (in % by weight, based on oxide): SiO2 >58-65 B2O3 >6-11.5 Al2O3 >21-25 MgO 4-8 CaO 0-8 SrO 2.6-<8 BaO 0-<0.5 with SrO + BaO >3 ZnO 0-2; said composition of said SiO2, said B2O 3, said Al2O3, said MgO, said CaO, said SrO, said BaO, said SrO+BaO, and said ZnO being selected to provide all of (i.), (ii.), (iii.), and (iv.), wherein (i.), (ii.), (iii.), and (iv.) comprise: (i.) a coefficient of thermal expansion α20/300 of between 2.8×10-6/K and 3.6×10-6/K; (ii.) a glass transition temperature, Tg, of more than 700 degrees Celsius to maximize heat resistance of said glass; (iii.) a temperature at a viscosity of 102 dPas of at most 1694 degrees Celsius; and (iv.) a processing temperature, VA, at a viscosity of 104 dPas of at most 1273 degrees Celsius. 16. The glass according to claim 15, wherein said glass comprises more than 8% by weight of B2O3. 17. The glass according to claim 16, wherein said glass additionally comprises (in % by weight): ZrO2 0-2 TiO2 0-2 with ZrO2 + TiO2 0-2 As2O3 0-1.5 Sb2O3 0-1.5 SnO2 0-1.5 CeO2 0-1.5 Cl- 0-1.5 F- 0-1.5 SO42- 0-1.5 with As2O3 + Sb2O3 + SnO2 + CeO2 + Cl-+ F-+ SO42- 0-1.5. 18. The glass according to claim 17, wherein: said glass is free of arsenic oxide and antimony oxide, apart from unavoidable impurities; and said glass comprises a float glass. 19. The glass according to claim 18, wherein said glass has a coefficient of thermal expansion α20/300 of between 2. 8×10-6/K and 3.6×10-6/K and a density, ρ, of <2. 600 g/cm3. 20. The glass according to claim 19, wherein said glass comprises a glass substrate for one of display technology and thin-film photovoltaics.