Preparation and characterization of Cu-MoSi2 composite coatings

Cu-MoSi2 composite coatings were obtained by an electrodeposition technique from a conventional acid copper sulfate bath. The effects of plating varia bles, such a particle concentration in the bath, cathode current density, s tir rate and stir type on particle content in the composite coatings (Vp) w ere investigated systematically and were compared with those for Cu-Al2O3. It was found that the relationships between Vp and stir rate, particle conc entration in the bath and current density were related to the nature of inc orporated particles (the density and electrical resistivity). Moreover, sti r type showed a great effect of Vp of Cu-MoSi2. The codeposition rate and i nternal stress of Cu-MoSi2 composite coatings were greatly influenced by pl ating variables. The physicomechanical properties, electrical resistivity, hardness and wear resistance of Cu-MoSi2 and Cu-Al2O3 were determined. It w as established that microhardness and wear resistance increased with the in crease of Vp for both Cu-MoSi2 and Cu-Al2O3. The hardness and electrical re sistivity of Cu-MoSi2 were lower compared with Cu-Al2O3. However, it was mo re abrasive than Cu-Al2O3.