초록 ▼

Provided is an alkali-free glass, comprising, as a glass composition in terms of mass %, 55 to 80% of SiO2, 10 to 25% of A12O3, 2 to 5.5% of B2O3, 3 to 8% of MgO, 3 to 10% of CaO, 0.5 to 5% of SrO, and 0.5 to 7% of BaO, having a molar ratio MgO/CaO of 0.5 to 1.5, being substantially free of alkali m

Provided is an alkali-free glass, comprising, as a glass composition in terms of mass %, 55 to 80% of SiO2, 10 to 25% of A12O3, 2 to 5.5% of B2O3, 3 to 8% of MgO, 3 to 10% of CaO, 0.5 to 5% of SrO, and 0.5 to 7% of BaO, having a molar ratio MgO/CaO of 0.5 to 1.5, being substantially free of alkali metal oxides, and having a Young's modulus of more than 80 GPa.

대표청구항 ▼

1. An alkali-free glass, comprising, as a glass composition in terms of mass %, 55 to 80% of SiO2, 10 to 25% of Al2O3, 2to 5.5% of B2O3, 4 to 8% of MgO, 3 to 7.5% of CaO, 0 to 5% of SrO, 0.5 to 7% of BaO, and 0 to 2% of ZnO, having a molar ratio MgO/CaO of 0.5 to 1.3, being substantially free of alk

1. An alkali-free glass, comprising, as a glass composition in terms of mass %, 55 to 80% of SiO2, 10 to 25% of Al2O3, 2to 5.5% of B2O3, 4 to 8% of MgO, 3 to 7.5% of CaO, 0 to 5% of SrO, 0.5 to 7% of BaO, and 0 to 2% of ZnO, having a molar ratio MgO/CaO of 0.5 to 1.3, being substantially free of alkali metal oxides, having a Young's modulus of more than 80 GPa, having a liquidus temperature of 1,195° C. or less, and having an average thermal expansion coefficient in a temperature range of 30 to 380° C. of 30 to 44.2×10−7/° C. 2. The alkali-free glass according to claim 1, further comprising 0.001 to 1 mass % of SnO2. 3. The alkali-free glass according to claim 1, wherein the alkali-free glass has a strain point of more than 680° C. 4. The alkali-free glass according to claim 1, wherein the alkali-free glass has a liquidus temperature of less than 1,195° C. 5. The alkali-free glass according to claim 1, wherein the alkali-free glass has an average thermal expansion coefficient in a temperature range of 30 to 380° C. of 30 to 39.2×10−7/° C. 6. The alkali-free glass according to claim 1, wherein the alkali-free glass has a temperature at 102.5 poise of less than 1,600° C. 7. The alkali-free glass according to claim 1, wherein the alkali-free glass has a viscosity at a liquidus temperature of 104.8 poise or more. 8. The alkali-free glass according to claim 1, wherein the alkali-free glass is formed by an overflow down-draw method. 9. The alkali-free glass according to claim 1, wherein the alkali-free glass has a thickness of less than 0.5 mm. 10. The alkali-free glass according to claim 1, wherein the alkali-free glass is used for an OLED device. 11. The alkali-free glass according to claim 1, wherein the alkali-free glass comprises in terms of mass %, 4.5 to 8% of MgO.