Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2006-03-31
2010-11-30
Hendrickson, Stuart (Department: 1793)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C430S212000, C075S343000, C075S721000
Reexamination Certificate
active
07842274
ABSTRACT:
The invention is directed to a process for manufacture of fine precious metal containing particles, specifically silver-based particles and silver-based contact materials via an intermediate silver(+1)-oxide species.The process comprises in a first step the formation of a thermally instable silver (+1)-oxide species by adding a base to an aqueous silver salt solution comprising an organic dispersing agent. Due to the presence of the organic dispersing agent, the resulting silver (+1)-oxide species is thermally instable, thus the species is decomposing to metallic silver at temperature lower than 100° C.The process optionally may comprise the addition of a powdered compound selected from the group of inorganic oxides, metals, and carbon-based compounds. Furthermore the process may contain additional separating and drying steps.The process is versatile, cost efficient and environmentally friendly and is used for the manufacture of silver-based particles and electrical contact materials. Silver nanoparticles made according to the process are characterized by a narrow particle size distribution. Electrical contact materials manufactured according to the process reveal improved contact welding properties.
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Braumann Peter
Fritzsche Sebastian
Goia Dan
Kempf Bernd
Vandevelde Thierry Charles Simon
Brinks Hofer Gilson & Lione
Hendrickson Stuart
Rump Richard M
Umicore, S.A.
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