초록 ▼

A glass composition SiO2, Al2O3, B2O3, and RO, where RO represents one kind or two or more kinds selected from MgO, CaO, SrO, and BaO, and allows two or more kinds of crystals selected from a SiO2—Al2O3—RO-based crystal, a SiO2-based crystal, and a SiO2—Al2O3-based crystal to precipitate in a temper

A glass composition SiO2, Al2O3, B2O3, and RO, where RO represents one kind or two or more kinds selected from MgO, CaO, SrO, and BaO, and allows two or more kinds of crystals selected from a SiO2—Al2O3—RO-based crystal, a SiO2-based crystal, and a SiO2—Al2O3-based crystal to precipitate in a temperature range of from a liquidus line temperature to (the liquidus line temperature—50° C.)

대표청구항 ▼

1. A glass, comprising as a glass composition SiO2, 18% to 25% by mass of Al2O3, 3% to 8% by mass of B2O3, 0% to 5% by mass of BaO, 2% to 13% by mass of CaO, 0.001% to 0.05% by mass of Fe2O3, 0.01% to 0.5% by mass of SnO2, 0% to 4.5% by mass of SrO, and 0% to 1.5% by mass of MgO and having a molar r

1. A glass, comprising as a glass composition SiO2, 18% to 25% by mass of Al2O3, 3% to 8% by mass of B2O3, 0% to 5% by mass of BaO, 2% to 13% by mass of CaO, 0.001% to 0.05% by mass of Fe2O3, 0.01% to 0.5% by mass of SnO2, 0% to 4.5% by mass of SrO, and 0% to 1.5% by mass of MgO and having a molar ratio CaO/Al2O3 of 0.3 to 0.9, and allowing two or more crystals selected from the group consisting of a SiO2—Al2O3—RO-based crystal, a SiO2-based crystal, and a SiO2—Al2O3-based crystal to precipitate in a temperature range of from a liquidus line temperature to (the liquidus line temperature −50° C.). 2. The glass according to claim 1, wherein the SiO2—Al2O3—RO-based crystal comprises anorthite, the SiO2-based crystal comprises cristobalite, and the SiO2—Al2O3-based crystal comprises mullite. 3. The glass according to claim 1, wherein the liquidus line temperature is lower than 1,250° C. 4. The glass according to claim 1, wherein a content of Li2O+Na2O+K2O in the glass composition is 0.5 mass % or less. 5. The glass according to claim 1, wherein the glass comprises as a glass composition, in terms of mass %, 57% to 70% of SiO2, 18% to 25% of Al2O3, 3% to 8% of B2O3, 0% to 1.5% of MgO, 2% to 13% of CaO, 0% to 4.5% of SrO, 0% to 5% of BaO, 0% to 5% of ZnO, 0% to 5% of ZrO2, 0% to 5% of TiO2, 0.001% to 0.05% of Fe2O3, 0.01% to 0.5% of SnO2, and 0% to 5% of P2O5, and has a molar ratio (MgO+CaO+SrO+BaO)/Al2O3 of from 0.8 to 1.3 and a molar ratio CaO/Al2O3 of from 0.3 to 0.9. 6. The glass according to claim 1, wherein the glass comprises as a glass composition, in terms of mass %, 58% to 70% of SiO2, 18% to 25% of Al2O3, 3% to 7% of B2O3, 0% to 1.5% of MgO, 3% to 13% of CaO, 0% to 4.5% of SrO, 0% to 5% of BaO, 0% to 5% of ZnO, 0% to 5% of ZrO2, 0% to 5% of TiO2, 0% to 5% of P2O5, 0.001% to 0.05% of Fe2O3, and 0.01% to 0.5% of SnO2, has a molar ratio (MgO+CaO+SrO+BaO)/Al2O3 of from 0.8 to 1.3 and a molar ratio CaO/Al2O3 of from 0.3 to 0.9, and is substantially free of Li2O and Na2O. 7. The glass according to claim 1, wherein the glass has a molar ratio CaO/MgO of from 2 to 20. 8. The glass according to claim 1, wherein the glass has a strain point of 700° C. or more. 9. The glass according to claim 1, wherein the glass has a Young's modulus of 75 GPa or more. 10. The glass according to claim 1, wherein the glass has a specific Young's modulus of 30 GPa/(g/cm3) or more. 11. The glass according to claim 1, wherein the glass has a flat sheet shape and is used for a liquid crystal display. 12. The glass according to claim 1, wherein the glass has a flat sheet shape and is used for an OLED display. 13. The glass according to claim 1, wherein the glass has a flat sheet shape and is used for a display driven by an oxide TFT.