| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique that easily manufactures a copper powder consisting of fine particles having an extremely sharp particle size distribution, by improving a method for manufacturing the copper powder, and to provide the copper powder that satisfies such characteristics of a copper paste as viscosity and film density, which have not been realized by a conventional copper powder. SOLUTION: In a process for manufacturing the copper powder, which includes mixing an alkali hydroxide with a copper salt aqueous solution containing bivalent copper ions to form a cupric oxide, reducing the cupric oxide into a cuprous oxide by adding a reducing sugar, and further reducing the cuprous oxide to form a metallic copper by adding a hydrazine-based reducing agent, this manufacturing method comprises previously charging a complexing agent into the copper salt solution, mixing it with the alkali hydroxide in an amount of 1.10-1.60 by reaction equivalent, and aging it so as to continue reaction of forming a black cupric oxide. COPYRIGHT: (C)2004,JPO
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