| 摘要 |
PURPOSE:To obtain a chemically stable glass composition for sealing, composed of SiO2, B2O3, K2O, Al2O3, ZnO and Nb2O5 at specific rations and having a linear expansion coefficient suitable for the sealing of a ferrite having high thermal expansion coefficient. CONSTITUTION:The objective glass composition for sealing is composed of 20-30(wt)% SiO2, 22-27% B2O3, 17-28% K2O, <8% Na2O, 12-20% Al2O3, 4-12% ZnO and <3% Nb2O5 wherein SiO2+B2O3 is 45-55%. The composition has a linear thermal expansion coefficient (alpha) of 115-135X10<-7>[ deg.C<-1>]. It is stable within the sealing temperature range (400-900 deg.C) and has low reactivity with the object to be sealed.
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