Sealing glass compositions

Details Sealing glass compositions Sealing glass compositions

C - Chemistry, Metallurgy

03

C

C03C 3/21 (2006.01) C03C 3/12 (2006.01) C03C 8/24 (2006.01) C03C 14/00 (2006.01) H01L 21/58 (2006.01) H01L 23/10 (2006.01)

Patent

CA 2066265

2066265 9104233 PCTABS00003 Fluid, stable glasses useful for low-temperature sealing applications are made by adding jointly bismuth oxide, zinc oxide, phosphorus pentoxide, titania and/or zirconium oxide to the lead oxide vanadium oxide binary. The phosphorus pentoxide may be replaced partially or entirely with niobium pentoxide and/or tantalum oxide. Sealing glass compositions comprising these low-melting lead-vanadia glasses in powder form and refractory fillers of lower thermal expansion for use in hermetically sealing semiconductor devices in ceramic packages are disclosed. Group V metal oxides, particularly niobium-containing oxides, are preferred fillers. Silver metal is a preferred filler for making die-attach compositions.

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