METHOD FOR PRODUCING COPPER POWDER

• Main Authors: KOBAYASHI RYOTA, ROKKAKU KOSUKE, YOSHIDA MITSUGI, ASAI TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2020
• Subjects: CASTING; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; WORKING METALLIC POWDER

To provide a copper powder having a high single crystallinity, a small particle diameter and a small distribution of particle diameters and to provide a method for producing a copper powder.SOLUTION: There is provided a method for producing a copper powder, which comprises: generating a copper chloride gas by the reaction between metal copper and a chlorine-containing gas; generating a plurality of copper particles by the reaction between a copper chloride gas and a reducing gas; reducing a chlorine content of the plurality of copper particles; and reducing an oxygen content of the plurality of copper particles. The removal of the copper chloride may be performed by treating the plurality of copper particles with an aqueous solution of a base. The base may be selected from alkali metal hydroxides.SELECTED DRAWING: Figure 1 【課題】単結晶性が高く、粒径とその分布が小さい銅粉体、および銅粉体を製造するための方法を提供すること。【解決手段】銅粉体を製造する方法は、金属銅と塩素含有ガスとの反応により塩化銅ガスを生成すること、塩化銅ガスと還元性ガスとの反応により複数の銅粒子を生成すること、複数の銅粒子の塩素含有量を低減すること、および複数の銅粒子の酸素含有量を低減することを含む。塩化銅の除去は、塩基の水溶液で複数の銅粒子を処理することで行ってもよい。塩基はアルカリ金属の水酸化物から選択することができる。【選択図】図１