THERMALLY DEVITRIFIABLE SEALING GLASSES AND METHOD OF SEALING USING SUCH GLASSES

摘要

Thermally devitrifiable sealing glasses capable of forming sound seals with glasses, glass-ceramics, and ceramics having coefficients of thermal expansion (0 DEG -300 DEG C) between 0.5-5 x 10<-><7>/ DEG C, consist essentially, expressed in weight percent on the oxide basis, of 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 indicated proportions of 0-3% K2O, 0-4% Rb2O and 0-6% Cs2O. In finely fritted form, the glasses can be sintered and crystallized in situ at 900 DEG -1000 DEG C. They facilitate sealing of fused silica glass and SiO2-TiO2 glass.