STUDY OF WEAR RESISTANCE AND NANOSTRUCTURE OF TERTIARY Al_2O_3/Y_2O_3/CNT PULSED ELECTRODEPOSITED NI-BASED NANOCOMPOSITE

摘要

We study the electrodeposition of tertiary Alumina/Yitria/carbon nanotube (Al_2O_3/Y_2O_3/CNT) nano-composite by using pulsed currents. The process of coating is performed in a nickel-sulfate bath and the nanostructure of the obtained compound layer is examined with the help of high-precision figure analysis of SEM nanographs. The effects of process variables, i.e., the Y_2O_3 concentration, treatment time,current density, and the temperature of electrolyte are experimentally investigated. Statistical methods are used to achieve the minimum wear rate and average size of nanoparticles. Finally, the percentage contributions of different effective factors are revealed, and the confirmation run showed the validity of the obtained results. It is also revealed that the wear properties of the coatings undergo significant changes if the sizes of nanoparticles change. The atomic-force microscopy (AFM) and transmission-electron microscopy (TEM) analyses confirm the smooth surfaces and average sizes of nanoparticles in the optimal coating.