Process for improving the flowability and increasing the bulk density of high-surface area valve metal powders

US4569693A · 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: Aug 22, 1983
• Grant date: Feb 11, 1986
• Expiry date: Aug 22, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C32/0031
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to an improvement of the flowability and an increase in the bulk density of high-surface area valve metal powders by means of the addition of finely divided extraneous metal oxides in quantities of up to 5000 ppm, relative to the quantity of metal, before the powder-metallurgical processing of the valve metal powder.