In this research, synthesis of Co3W–Cu composite nanopowders based on Co3W intermetallic compound by mechanical milling and hydrogen reduction process was investigated. Powder mixture of Co3O4, WC and CuO with Co50W40Cu10 stoichiometry was first milled by high energy planetary ball mill and then reduced in a hydrogen reduction system. Crystallite structure of milled mixture and reduced powders was determined by X-ray diffraction. Particles size, morphology and cross-section of reduced samples were studied by SEM, TEM and SEM back scattered electron microscopy. Optimum condition of reduction under hydrogen atmosphere was found at 900uC. Particles have Cu coring structure surrounded with Co3W intermetallic compound. Mean particle size was observed less than 50 nm with six fold hexagon morphology.
