公开(公告)号：EP2004551A2

公开(公告)日：2008-12-24

申请号：EP07723739.4

申请日：2007-03-29

申请人： Umicore SA

发明人： GOIA, Dan, V. ,  FRITZSCHE, Sebastian ,  KEMPF, Bernd ,  BRAUMANN, Peter ,  VANDEVELDE, Thierry, Charles, Simon

IPC分类号： C01G5/00 ,  H01H1/027 ,  H01H1/021 ,  H01H11/04 ,  H01H1/0233 ,  H01H1/0237 ,  H01R13/03 ,  B22F1/00

CPC分类号： C01G5/00 ,  B22F1/0014 ,  B22F1/0018 ,  B22F9/24 ,  B82Y30/00 ,  C01P2004/64 ,  C01P2006/40 ,  H01H1/021 ,  H01H1/0233 ,  H01H1/0237 ,  H01H1/027 ,  H01H11/048 ,  H01R13/03

摘要： 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(+l)-oxide species. The process comprises in a first step the formation of a thermally instable silver (+l)-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 (+l)-oxide species is thermally instable, thus the species is decomposing to metallic silver at temperature lower than 1000°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.