Patent · US Expired

Process for the production of a copper powder containing dispersoids

US5707420A · kind A · utility

0Cited by

5References

13Claims

0Family size

Assignee

Norddeutsche Affinerie Aktiengesellschaft

Inventors

Bernd Langner · Winsen, DE
Peter Stantke · Buxtehude, DE
Rene-Holger Wilde · Badendorf, DE

Key dates

Filing date	Sep 26, 1995
Grant date	Jan 13, 1998
Priority date	—
Expiry date	Sep 26, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC22C1/1026
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The copper powder contains at least one substance, which is not soluble in copper, e.g. Al.sub.2 O.sub.3, TiO.sub.2, SiO.sub.2 or B.sub.2 O.sub.3. For the production of this copper powder, a surplus of copper metal granulate is mixed with an ammonium salt and/or ammonium hydroxide, together with a saline solution in an aqueous solution, while a gas containing oxygen is added, and at a pH-value of at least 4. A copper-containing precipitate is produced, which is separated and treated at a temperature in the range from 150.degree. to 500.degree. C. in a reducing atmosphere. During this process, Cu(OH).sub.2 and Cu-oxide are transformed into metallic copper powder, which contains the dispersoid. The dispersoid content of the copper powder is preferably in the range from 0.1 to 5% by weight.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.