چكيده به لاتين
A series of materials with dual properties of metals and ceramics which name of MAX Phases have been developed recently, in this study, particles of Ti2AlC was used on the copper substrate as reinforcing phase Nickel-based composite coating to maintain thermal conductivity, improve abrasion resistance and increase the service life of copper equipment. Therefore, the effect of different parameters of electrodeposition process such as current density, type of current, frequency, working cycle, concentration of reinforcing particles in solution and electrodeposition bath temperature was investigated to determine the most optimal coating and optimal sample. To analyze the structure and morphology of the coating, SEM and OM images were taken from the surface and cross-section of the samples before and after the wear test. XRD test and characterization of possible phases of nickel phase and Ti2AlC nanoparticles were determined. Also, the size of the coating crystallinity was determined using X-ray diffraction pattern and William Son-Hall equation. Coating hardness was measured using Vickers microhardness test and abrasion test was performed to evaluate the wear resistance properties. Finally, sample 13 with Ni-Ti2AlC nanocomposite coating and determination of electrodeposition parameters, type of PRC current, frequency 100Hz, working cycle 60%, current density 10A/dm2, particle concentration 15g/lit, crystal size of 35nm, coating thickness 142μm and hardness 421Hv, was selected with the best mechanical properties. The application of reverse pulse current compared to pulse and direct current resulted in the formation of a more homogeneous structure in the coating (microhardness of sampale 5, 351Hv and sample 12, 290Hv).
