Very low expansion sealing frits

Details Very low expansion sealing frits Very low expansion sealing frits

C - Chemistry, Metallurgy

04

B

261/20, 49/82

C04B 37/04 (2006.01) C03C 8/24 (2006.01) C03C 10/00 (2006.01)

Patent

CA 1156684

Abstract of the Invention This invention is drawn to thermally devitrifiable sealing glasses capable of forming sound seals with glasses, glass-ceramics, and ceramics having coefficients of thermal expansion (0°-300°C) between about 0.5-5 x 10-7/°C. In finely fritted form, the glasses can be sintered and crystal- lized in situ at about 900°-1000°C. The glasses consist essentially, expressed in weight percent on the oxide basis, of about 1-2% Li2O, 0.7-1.5% MgO, 9-13% ZnO, 19-23% Al2O3, 62-68% SiO2, and at least 1% K2O + Rb2O + Cs2O in the indi- cated proportions of 0-3% K2O, 0-4% Rb2O, and 0-6% Cs2O.

390015

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