Electrolytic capacitors

Details Electrolytic capacitors Electrolytic capacitors

H - Electricity

01

G

334/5

H01G 9/00 (2006.01) H01G 9/04 (2006.01)

Patent

CA 1056922

A B S T R A C T In the manufacture of tantalum capacitor anodes from powdered tantalum, part of the tantalum is used only as a contact and does not play an active part in the capacity forming mechanism. Tantalum, and other valve metal such as niobium and including alloys thereof such as niobium/tantalum alloys are expensive, and it is an object of the present invention to replace the non-contact valve metal with a less expensive material. The invention provides an electrode for an electrolytic capacitor comprising a compacted, porous body of valve metal coated particles, wherein the particle cores are of a non-conducting, non-combustible material and wherein the initial thick- ness of the valve metal coating is such that upon anodisation of the body at an anodising voltage determined by the required voltage code of the capacitor the average thickness of the unanodised valve metal coating does not exceed 0.5 micrometres.

229300

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