A kind of novel core-shell Cu/Al powders has been prepared by displacement method, in which nano-sized Cu was made to cover the surface of micron-sized aluminum powders. This reaction happened under the existence of coordination agent—fluoride and protective agent—gelatin. The preparation method and reaction mechanism have been discussed. The microstructure and morphology of the Cu/Al powders were investigated by SEM, XRD, EDS and BET. The analysis results show that this method can prepare the compact shell for Cu/Al powders. The Cu particle coated on aluminum particle was uniform and continuous. The average diameter of Cu crystallites was about 20 nm.

Key words: nanoparticle, aluminum powder, copper, core-shell structure, preparation