Tantalum powder for the production of solid electrolyte capacitors

US7898794B2 · kind B2 · utility

Assignee

• H.C. STARCK INC. · US

Inventors

• Helmut Haas · Achim, DE
• Ulrich Bartmann · Goslar, DE

Key dates

• Filing date: Sep 24, 2005
• Grant date: Mar 1, 2011
• Expiry date: Sep 17, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B34/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A tantalum powder consisting of agglomerated primary particle with a minimum primary particle dimension of 0.2 to 0.8 μm, a specific surface area of 0.9 to 2.5 m2/g and a particle size distribution determined to ASTM B 822 corresponding to a D10 value of 5 to 25 μm, a D50 value of 20 to 140 μm and a D90 value of 40 to 250 μm, wherein the powder does not comprise an effective content of sintering protection agents.