The present invention relates to a method for changing the particle morphology of a copper powder by a planetary ball milling process. For making an alloy of copper powder and multiwall carbon nanotubes, in order to produce a complex material, the copper powder having a predetermined particle size is pulverized with a ball medium, by a planetary ball mill, at a predetermined rotation velocity and pulverization time, until the copper lump becomes plate copper powder. The lump copper powder can easily become a plate copper powder which is improved of charging properties.;COPYRIGHT KIPO 2014
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