Process for treating the surface of valve metals with chalcogens

US4548672A · kind A · utility

Assignee

• Hermann C. Starck Berlin GmbH & Co. KG · DE

Inventors

• Wolf-Wigand Albrecht · Bad Harzburg, DE
• Axel Hoppe · Bad Harzburg, DE
• Uwe Papp · Goslar, DE
• Rudiger Wolf · Vienenburg, DE

Key dates

• Filing date: Sep 28, 1984
• Grant date: Oct 22, 1985
• Expiry date: Sep 28, 2004

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01G9/04
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for treating the surface of valve metals, in particular niobium and tantalum, in the form of agglomerated or non-agglomerated powders, thin foils or molded articles prepared from powder, for use as electrolytic capacitor electrodes, these metals being heated in at least one stage to temperatures of 300.degree. to 2,000.degree. C. under a high vacuum or an inert gas atmosphere and in the presence of chalcogens or chalcogen compounds, excluding oxygen.