| abstract |
Stable fluid glasses useful in low temperature sealing applications are produced by the joint addition of bismuth oxide, zinc oxide, phosphorous pentoxide, titanium dioxide and / or zirconium oxide to the alloy binary lead oxide and vanadium oxide. The phosphorous pentoxide can be partially or totally replaced by niobium pentoxide and / or tantalum oxide. Sealing glass compositions comprising these low-melting lead vanadium oxide glasses in powder form, as well as refractory fillers of low thermal expansion, used in the hermetic sealing of semiconductor devices are described. in ceramic cases. Group IV metal oxides, especially oxides containing niobium, are the preferred fillers. Silver metal is a preferred filler for the manufacture of matrix fixing compositions. |