Claims
- 1. A capacitor comprising a ceramic monolith having a plurality of electrode receiving voids, alternate said voids extending to opposite ends of said monolith, said voids being substantially filled with a metallic composition comprising lead, characterized in that said ends of said capacitor are each covered by a coating comprised of fused frit and at least one metal subject to oxidation when heated in an oxidizing environment, the portions of said metal within said coating remote from said ends of said monolith being in a substantially oxidized condition and hence resistant to wetting by molten lead, the portions of said metal in said frit coating lying adjacent said ends being in an unoxidized or lesser oxidized condition and being wetted by portions of said lead composition, the combination including conductive layers formed over the surfaces of said coatings remote from said ends, said conductive layers being in electrical contact through said coatings with said metallic composition.
- 2. A capacitor in accordance with claim 1 wherein said metal within said coating is selected from the group consisting of copper nickel and silver.
- 3. A capacitor in accordance with claim 1 wherein said coating is porous.
- 4. As a new article of manufacture a capacitor manufactured by the method of providing a ceramic monolith having a plurality of electrode receiving voids alternate said voids extending to oposite ends of the monolith coating said ends of said monolith with a termination paste comprised of frit and at least one metal subject to oxidation when heated in an oxidizing environment, the selected metal being characterized in that the metal is wettable by lead and the oxide of such metal is essentially non-wettable by lead, heating said monolith to fuse said frit, causing said coating to be exposed in heated condition to an oxidizing environment for a time sufficient to substantially oxidize the metal components of said pastes adjacent the surfaces of said coating while metal components in the portions of said coating remote from said surfaces remain in an unoxidized or lesser oxidized condition, thereafter injecting a molten metal comprising lead into the interior of said voids through said coating, and thereafter applying conductive metallic layers over said coating.
- 5. A ceramic capacitor in accordance with claim 4 wherein the metal component of said paste comprises one or more of the metals selected from the group consisting of copper, nickel and silver.
- 6. A capacitor in accordance with claim 4 wherein said paste is heated in an oxidizing environment simultaneously to fuse said frit and oxidize said metal component in said paste adjacent the surface of said coating.
- 7. A capacitor manufactured in accordance with the method of claim 4 wherein said paste is fused in an oxygen free enironment and said monolith incorporating said fused paste is thereafter heated in an oxidizing environment to induce oxidation of the metal components of said fused paste adjacent the exterior of said fused paste while retaining increments of the metal components of said fused past adjacent said monolith substantially free of oxidation.
Parent Case Info
This is a Divisional of application Ser. No. 214,513 filed July 1, 1988 and now U.S. Pat. No. 4,881,308 issued November 21, 1989.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4584629 |
Garcia et al. |
Apr 1986 |
|
4652967 |
Sakabe et al. |
Mar 1987 |
|
4819128 |
Florian et al. |
Apr 1989 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
214513 |
Jul 1988 |
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