Lead filled ceramic capacitor

Details Lead filled ceramic capacitor Lead filled ceramic capacitor

1989-11-20

1990-06-19

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, H01G 410, H01G 700

Patent

active

049358430

ABSTRACT:
A method of manufacturing a ceramic capacitor of the lead filled type includes coating the ends of the ceramic monolith with a terminating paste incorporating oxidizable metal particles characterized in that the lead will not wet to oxides of the metals but will wet to unoxidized or lightly oxidized increments of the metals. The paste is fused in an oxidizing environment or is fused in an inert environment and thereafter heated in an oxidizing environment with the result that the metal increments adjacent the exterior of the fused coating are oxidized whereas the metal at the interior portions of the paste are unoxidized or only slightly oxidized. Upon metal injection, the lead will wet to the interior portions of the fused paste but will not wet to the exterior of the paste whereby injected chips may be readily separated and whereby the size of the chip is rendered predictable due to the absence of adherent lead.

REFERENCES:
patent: 4584629 (1986-04-01), Garcia et al.
patent: 4652967 (1987-03-01), Sakabe et al.
patent: 4819128 (1989-04-01), Florian et al.

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