H.c. Starck Gmbh

Rüdiger Wolf

Christoph Schnitter

Karlheinz Reichert

Josua Löffelholz

Hady Seyeda

A valve metal powder by is prepared by a particular set of sequential steps that involves the use of precursor having preformed morphology. The method by which the valve metal is prepared includes a stabilization step that results in the valve metal powder having secondary and tertiary structures that each corresponds to the secondary and tertiary structures of the precursor. Also described is a method of producing solid electrolyte capacitors that include the valve metal powder of the present invention.

Valve metal powders

Process for producing a valve metal powder by producing a precursor of desired morphology, converting the precursor into an oxide of the valve metal, stabilizing the structure of the oxide by heat treatment and reducing the stabilized oxide while retaining the morphology. Valve metal powders obtainable in this way, in particular comprising spherical agglomerates with a mean agglomerate size of 10&#x2013;80 &#x3bc;m, preferably 20&#x2013;40 &#x3bc;m, and use of these valve metal powders to produce solid electrolyte capacitors.

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Goslar, Germany

Rüdiger Wolf