Provided is an alkali-free glass, including as a glass composition, in terms of mol %, 60 to 70% of SiO2, 9.5 to 17% of Al2O3, 0 to 9% of B2O3, 0 to 8% of MgO, 2 to 15% of CaO, 0.1 to 10% of SrO, and 0.5 to 4% of BaO, having a molar ratio (CaO+SrO+BaO)Al2O3 of 0.6 to 1.0, and being substantially fre
Provided is an alkali-free glass, including as a glass composition, in terms of mol %, 60 to 70% of SiO2, 9.5 to 17% of Al2O3, 0 to 9% of B2O3, 0 to 8% of MgO, 2 to 15% of CaO, 0.1 to 10% of SrO, and 0.5 to 4% of BaO, having a molar ratio (CaO+SrO+BaO)Al2O3 of 0.6 to 1.0, and being substantially free of alkali metal oxides.
대표청구항▼
1. An alkali-free glass, comprising as a glass composition, in terms of mol %, 60 to 66.8% of SiO2, 12.3 to 17% of Al2O3, 5.4 to 9% of B2O3, 0 to 6.4% of MgO, 5.7% to 15% of CaO, 0.1 to 10% of SrO, and 0.5 to 4% of BaO, having a molar ratio (CaO+SrO+BaO)/Al2O3 of 0.6 to 1.0, and being substantially
1. An alkali-free glass, comprising as a glass composition, in terms of mol %, 60 to 66.8% of SiO2, 12.3 to 17% of Al2O3, 5.4 to 9% of B2O3, 0 to 6.4% of MgO, 5.7% to 15% of CaO, 0.1 to 10% of SrO, and 0.5 to 4% of BaO, having a molar ratio (CaO+SrO+BaO)/Al2O3 of 0.6 to 1.0, and being substantially free of alkali metal oxides, wherein the alkali-free glass has an average thermal expansion coefficient in the temperature range of 30 to 380° C. of 361×10−7 to 50×10−7/° C. 2. The alkali-free glass according to claim 1, wherein the alkali-free glass has a molar ratio (CaO+SrO+BaO)/Al2O3 of 0.6 to 0.9. 3. The alkali-free glass according to claim 1, further comprising 0.001 to 0.3 mol % of SnO2. 4. The alkali-free glass according to claim 1, wherein the alkali-free glass is substantially free of As2O3 and Sb2O3. 5. The alkali-free glass according to claim 1, wherein the alkali-free glass comprises less than 0.2 mol % of ZrO2. 6. The alkali-free glass according to claim 1, wherein the alkali-free glass has a molar ratio (SiO2+MgO)/B2O3 of less than 18.5. 7. The alkali-free glass according to claim 1, wherein the alkali-free glass has a strain point of more than 692° C. 8. The alkali-free glass according to claim 1, wherein the alkali-free glass has a Young's modulus of more than 75 GPa. 9. The alkali-free glass according to claim 1, wherein the alkali-free glass has a specific Young's modulus of more than 30 GPa/g/cm3. 10. The alkali-free glass according to claim 1, wherein the alkali-free glass has a density of less than 2.59 g/cm3. 11. The alkali-free glass according to claim 1, wherein the alkali-free glass has a liquidus temperature of less than 1,210° C. 12. The alkali-free glass according to claim 1, wherein the alkali-free glass has a temperature at 1040 poise of less than 1,350° C. 13. The alkali-free glass according to claim 1, wherein the alkali-free glass has a temperature at 1025 poise of less than 1,620° C. 14. The alkali-free glass according to claim 1, wherein the alkali-free glass has a viscosity at a liquidus temperature of 1048 poise or more. 15. The alkali-free glass according to claim 1, wherein the alkali-free glass has a thermal shrinkage ratio of less than 40 ppm when a temperature of the alkali-free glass is increased from a room temperature of 25° C. to 500° C. at a rate of 5° C./minute, is kept at 500° C. for 1 hour, and is then dropped to the room temperature at a rate of 5° C./minute. 16. The alkali-free glass according to claim 1, wherein the alkali-free glass is formed by an overflow down-draw method. 17. The alkali-free glass according to claim 1, wherein the alkali-free glass has a thickness of less than 0.5 mm. 18. The alkali-free glass according to claim 1, wherein the alkali-free glass is used for an OLED device.
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이 특허에 인용된 특허 (5)
Gerhard Lautenschlager DE; Klaus Schneider DE; Thomas Kloss DE; Andreas Sprenger DE, Alkali-free aluminoborosilicate glass, its use and process for its preparation.
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