Synthesis of A New Conductive Copper Powder Composite

3.5 μm spherical copper powders coated with Sn-Bi alloy were synthesized using Bi₂O₃ and Sn(OH)₄ as raw materials and NaBH₄ as reductant.Then,copper powders and polymer matrixes (polyvinyl pyrrolidone,acrylic resins,epoxy) were blended to prepare conductive composites.The composition and structure of coated copper powders were characterized by Scanning Electron Microscopy (SEM),Energy Dispersive Spectroscopy (EDS) and Differential Scanning Calorimetry (DSC).The dispersion and stability properties of the composites were characterized by fineness gauge,and electric conductivity of composites was also investigated by multimeter.Results show that the coated copper powder composites possess much stronger conductive capability than the pure copper powder composites.