H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

H.c. Starck Tantalum and Niobium Gmbh

Roto Frank Ag

Ulrich Bartmann

Helmut Haas

Nobuyuki Sato

Tadashi Komeya

Christoph Schnitter

Elisabeth Droste

Volker WÖHRN

Hannes Klöpfer

Elisabeth Gorman

Jörg Scheffel

Dirk Stempfhuber

The present invention relates to a process for the deoxidation of valve metal primary powders by means of reducing metals and/or metal hydrides, and a process for the production of tantalum powders that are suitable as anode material for electrolytic capacitors.

Method for the production of valve metal powders

Process for the production of valve metal powders, in particular niobium and tantalum powder, by reduction of corresponding valve metal oxide powders by means of vaporous reducing metals and/or hydrides thereof, preferably in the presence of an inert carrier gas, wherein the reduction is performed at a vapor partial pressure of the reducing metal/metal hydride of 5 to 110 hPa and an overall pressure of less than 1000 hPa, and tantalum powder obtainable in this way having a high stability of the powder agglomerate particles.

Method for production of niobium and tantalum powder

A tantalum powder consisting of agglomerated primary particle with a minimum primary particle dimension of 0.2 to 0.8 &#x3bc;m, a specific surface area of 0.9 to 2.5 m/g and a particle size distribution determined to ASTM B 822 corresponding to a D10 value of 5 to 25 &#x3bc;m, a D50 value of 20 to 140 &#x3bc;m and a D90 value of 40 to 250 &#x3bc;m, wherein the powder does not comprise an effective content of sintering protection agents.

Tantalum powder for the production of solid electrolyte capacitors

Method for the production of niobium and tantalum powder

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Goslar, Germany

Ulrich Bartmann