Preparation and Characterization of Cu-MoSi2 Composite Coatings

Abstract

SUMMARYCu-MoSi2 composite coatings were obtained by an electrodeposition technique from a conventional acid copper sulfate bath. The effects of plating variables, such as particle concentration in the bath, cathode current density, stir rate and stir type on particle content in the composite coatings (Vp) were investigated systematically and were compared with those for Cu-Al2O3,. It was found that the relationships between Vp and stir rate, particle concentration in the bath and current density were related to the nature of incorporated particles (the density and electrical resistivity). Moreover, stir type showed a great effect on Vp of Cu-MoSi2. The codeposition rate and internal stress of Cu-MoSi2 composite coatings were greatly influenced by plating variables. The physicomechanical properties, electrical resistivity, hardness and wear resistance of Cu-MoSi2 and Cu-Al2O3, were determined. It was established that microhardness and wear resistance increased with the increase of Vp for both Cu-MoSi2 and Cu-Al2O3,. The hardness and electrical resistivity of Cu-MoSi2 were lower compared with Cu-Al2O3. However, it was more abrasive than Cu-Al2O3.