Sealing materials and glasses

Details Sealing materials and glasses Sealing materials and glasses

C - Chemistry, Metallurgy

03

C

C03C 3/247 (2006.01) C03C 8/14 (2006.01) C03C 8/18 (2006.01) C03C 8/24 (2006.01)

Patent

CA 2050517

Mill additions are disclosed which lower the CTE of, and are compatible with, tin-phosphorus oxyfluoride glasses. The sealing materials provide fusion-type seals having a CTE not over about 110x10-7/°C and a sealing temperature not over about 350°C. Also disclosed is a family of glass compositions in the tin-phosphorus oxyfluoride system that exhibit very low glass transition temperatures and coefficients of thermal expansion not over about 160x10-7/°C (25-150°C). In addition to the four basic elements, the glasses contain up to 11% Nb, and may additionally contain up to 10%, taken individually or in combination, of V, Fe and/or Mo to further decrease the Tg and CTE values.

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