Abstract
Hydrogen reduction of acidic copper sulfate solution was studied to obtain fine copper powder suitable for conductive paste. Reaction rate of hydrogen reduction of cupric ion to cuprous (Cu2++1/2H2→Cu++H+) was catalytically enhanced twice by addition of 0.1g/l Bi3+Coarse copper powder (>10μm) was obtained with further hydrogen reduction of cuprous ion to metallic copper (Cu++1/2H2→Cu0 +H+), because of some heterogeneous nature of the reaction.Fine copper powder (about 2μm) was obtained only by disproportionation of cuprous ion to metallic copper and cupric ion (2Cu→Cu0+Cu2+), which occurs by means of cooling the Cu+solution. The cooling rate and Cu+ion concentration determine size and shape of the powder. Experiments using a continuous autoclave resulted in oxidation resistant powder consisted of single crystals of about 5μm in size.
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