Compositions – Electrically conductive or emissive compositions – Free metal containing
Patent
1988-04-04
1989-07-11
Robinson, Ellis P.
Compositions
Electrically conductive or emissive compositions
Free metal containing
252518, 106 114, 106 115, 106 118.1.19, 106 121, 428209, 428432, 428144, 428402, 428403, 428901, H01B 102
Patent
active
048470031
ABSTRACT:
In the fabrication of various hybrid devices, it is the practice to provide thick film conductors of two different compositions, namely, a high palladium content silver-palladium film and an essentially pure silver film. The silver-palladium films are used because of their excellent physical and chemical properties, but are relatively expensive. The silver-based films do not have comparably good properties (with the exception of low electrical resistivity), but are less expensive than the silver-palladium films and are used in substitution therefore on less "demanding" areas of the device. However, the two films interact when in contact, and discontinuities or open circuits can occur as a result. The present invention provides a novel silver-based conductor film including a small percentage of palladium and one or both of aluminum oxide and silicon dioxide. These additives function to inhibit interaction between the novel silver-based films and the known silver-palladium films, hence avoiding the occurrence of discontinuities, while still allowing low electrical resistance bonding between the two films.
REFERENCES:
patent: 4207369 (1980-06-01), Kazmierowicz
patent: 4273822 (1981-06-01), Bube
patent: 4415624 (1983-11-01), Prabhu et al.
patent: 4733328 (1981-03-01), Blazej
Delco Electronics Corporation
Robinson Ellis P.
Ryan P. J.
Wallace Robert J.
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