Nihon Yamamura Glass Co., Ltd.

Hideyuki Kuribayasi

Yoshitaka Mayumi

Disclosed is a glass composition which is adapted to use in providing a hermetic seal between a metal and a ceramic, a metal and a metal, and a ceramic and a ceramic, to form crystallized glass having high strength and high thermal expansion which allow it to be used at high temperatures of 950&#xb0; C. and over. The glass composition is substantially free of alkali metals, and contains, as calculated as oxide, 15-30 mass % of SiO, 0-5 mass % of AlO, 20-35 mass % of BO, 10-25 mass % of CaO, 25-40 mass % of MgO, 3-8 mass % (3.0% excluded) of ZrO, and 0-3 mass % of CeO, wherein the crystallized glass which is formed by firing a glass powder made of the glass composition at a temperature of 850-1050&#xb0; C. has a thermal expansion coefficient of 90-110&#xd7;10/&#xb0; C. at 50-550&#xb0; C. and flexural strength of not less than 80 MPa.

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Hyogo, Japan

Hideyuki Kuribayasi