Method for making a plurality of solid electrolyte capacitors an

Details Method for making a plurality of solid electrolyte capacitors an Method for making a plurality of solid electrolyte capacitors an

1978-04-18

1980-02-19

Tupman, W. C.

Metal working

Method of mechanical manufacture

Assembling or joining

29583, 29591, B01J 1700

Patent

active

041887069

ABSTRACT:
An array of porous oxide-filmed tantalum pads that are sintered to a tantalum foil, each have a composite MnO.sub.2 layer formed thereover by the steps of filling the pad pores with a manganous nitrate solution by capillarity from a sponge-like reservoir pressed gently against the pads, pyrolyzing, screen printing over the first MnO.sub.2 sublayer a thixotropic mixture of MnO.sub.2 powder and manganous nitrate and pyrolyzing, and again depositing from the sponge-like reservoir a quantity of manganous nitrate and pyrolyzing again. A counterelectrode is formed over the composite MnO.sub.2 layer at the top of each pad. A temporary masking layer is deposited over each of the counterelectrodes. The streets separating the pads, and the pads themselves are flooded with an insulative resin. Excess resin is removed with a squeegee and the resin is cured. The masking layer is removed and slots are gouged in the resin in the alternate of the columnar streets, which alternate streets are wider than the others. A U-shaped nickel channel is welded to the substrate in the slots and the substrate is severed along lines that are central to the channel to produce discrete flip-chip style capacitors.

REFERENCES:
patent: 3458775 (1969-07-01), Flaks
patent: 3469294 (1969-09-01), Hayashi
patent: 3579813 (1971-05-01), Tomiwa
patent: 3889357 (1975-06-01), Millard

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