초록 ▼

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 pentox

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.

대표청구항 ▼

A low-melting glass composition comprising, in weight percent calculated on an oxide basis: (a) PbO: 35-50% (b) V2O5: 35-50% (c) Bi2O3: 0.1-6% (d) P2O5, Nb2O5, Ta2O5, or combinations thereof: 0.1-8% (e) ZnO, MgO, CaO, BaO, SrO, or combinations thereof: 0.1-5% (f) TiO2, ZrO2, or combinations thereof:

A low-melting glass composition comprising, in weight percent calculated on an oxide basis: (a) PbO: 35-50% (b) V2O5: 35-50% (c) Bi2O3: 0.1-6% (d) P2O5, Nb2O5, Ta2O5, or combinations thereof: 0.1-8% (e) ZnO, MgO, CaO, BaO, SrO, or combinations thereof: 0.1-5% (f) TiO2, ZrO2, or combinations thereof: 0.1-5% wherein the combined weight percent of (c)+(d)+(e)+(f) is in the range of 0.4-24%.