Importance

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Abstract

Disclosed is a glass composition that gives a high thermal expansion crystallized glass having a thermal expansion coefficient of not less than 130×10⁻⁷/° C. after its firing in the form of powder at a temperature not lower than 850° C. The glass composition is substantially free of alkali metal oxides, and contains 12-25 mass % SiO₂, 10-20 mass % B₂O₃ (but, not including 20 mass %), 18-30 mass % CaO, 15-30 mass % MgO, and 10.5-27 mass % BaO, wherein the glass composition, when fired in the form of glass powder at a temperature of 850-1050° C., forms a crystallized glass that exhibits a thermal expansion coefficient of at least 130×10⁻⁷/° C. in the range of 50-800° C.

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First Claim