Low melting glass composition

Details Low melting glass composition Low melting glass composition

1987-01-20

1988-05-10

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

428426, 428432, 428433, 428434, 501 15, 501 17, 501 32, 501 41, 501 44, 501 46, C03C 312, C03C 321, C03C 1400, C03C 824

Patent

active

047433027

ABSTRACT:
Fluid, stable glasses that are useful for low temperature sealing applications are made by adding jointly bismuth oxide, zinc oxide, and phosphorus pentoxide to the lead oxide-vanadium oxide binary. The phosphorous pentoxide may be replaced partially or entirely with niobium pentoxide and/or tantalum pentoxide. Additives and fillers may be incorporated into the glass composition to enhance the fluidity or adhesive characteristics of the glass, alter its coefficient of linear thermal expansion or make it suitable for die attach application. Group V metal oxides, particularly niobium pentoxide, are preferred fillers for altering the coefficient of linear thermal expansion. Similarly these Group V metal oxides may also be added as particulate fillers to lead borate, lead borosilicate and zinc borate glasses. Silver metal is a preferred filler for making die attach compositions.

REFERENCES:
patent: 3408212 (1965-06-01), Dumesnil
patent: 3454408 (1969-07-01), Busdiecker
patent: 3650778 (1972-03-01), Dumesnil et al.
patent: 3837866 (1974-09-01), Malmandier et al.
patent: 4186023 (1980-01-01), Dumesnil et al.

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