ガス噴霧法による不規則状銅粉の製造

概要

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Because of high surface tensional force of molten copper, air atomized copper powders show spherical shape, and such powders have poor pressing properties, exhibiting low green strength. In the manufacture of porous bronze bearing, it is necessary to use copper powder of a substantially lower apparent density, with good properties for pressing and facility for producing compacts of high and controlled porosity. In the present work, with the object of producing a copper powder having a low apparent density, effects of cooling capacity and the addition of small amounts of constituents to the melt on apparent densities of copper powders were examined. The results are as follows; 1) The quenching action of the water from V-type auxiliary water jet, about 40l/min, was not sufficient to solidify the particle in the as-atomized shape. 2) The addition of small amounts of constituents which probablly form thin oxide films on the surface of the molten copper droplet was very effective to make copper powders having highly irregular particle shapes with apparent densities, 3.0 to 2.3g/cm3. 3) Their microscopic appearance was similar to that of the reduced powder.
社団法人粉体粉末冶金協会の論文