Alkali-free glass
AssigneeNippon Electric Glass Co., Ltd.
InventorsTakahiro Kawaguchi, Shinkichi Miwa
Life of this patent
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Abstract
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.
Claims11
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.
Dependencies are inferred from the claim text.