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Öğe Tribological behavior of copper/MWCNT nanocomposites produced by pulse Electrodeposition(2014) Gül, Harun; Uysal, Mehmet; Akbulut, Hatem; Alp, AhmetCopper coatings containing well-distributed multiwalled carbon nanotubes were obtained by pulse electrodeposition in acidic sulfate bath in order to improve the microhardness and wear resistance of coatings. Multiwalled carbon nanotubes concentration was determined as the most significant factor for the incorporation of multiwalled carbon nanotubes in copper based electrolyte. The amount of embedded multiwalled carbon nanotubes and the microhardness of nanocomposites were found to increase with the increase of multiwalled carbon nanotubes in the electrolyte. The tribological properties of nanocomposites deposited by pulse electrocodeposition technique were studied by reciprocating ball on-disk method. The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The experimental results indicated that the wear resistance of copper composite is superior to that of pure copper. The friction coeffcient and wear rates decreased with the increase in the concentration of multiwalled carbon nanotubes in the electrolyte.Öğe Reciprocating sliding speed effect on the tribological properties of SiCp reinforced Ni MMCs deposited by electroplating(European Conference on Composite Materials, ECCM, 2012) Gül, Harun; Aslan, Serdar; Akbulut, Hatem; Alp, AhmetIn the present work, Ni/SiC metal matrix composite (MMC) coatings were prepared from a modified Watt's type electrolyte containing nano-SiC particles by direct current (DC) plating method to increase wear resistance of Ni. The influence of surfactant content on co-deposition of SiC particles (0.1-1.0 ?m size range) in the matrix, and tribological properties were investigated. The influence of sliding speed on the tribological performances of the coatings was investigated by a reciprocating ball-on disk apparatus. The wear tests were carried out at different sliding speeds by using a constant load. Wear resistances and friction coefficients of Ni/SiC composites were decreased by increasing sliding speed because of temperature-controlled surface oxidation. The change in wear mechanisms by changing surfactant content and sliding speeds were also comprehensively studied and, in general, decreasing surface damage was obtained by increasing sliding speed.Öğe Effect of reciprocating sliding speed on the tribological performance of nano Al2O3 reinforced Ni MMCs produced by DC and pulse electro co-depositions(European Conference on Composite Materials, ECCM, 2012) Gül, Harun; Akbulut, Hatem; Alp, A.In this study, Ni/Al2O3 metal matrix composite (MMC) coatings were prepared from a modified Watt's type electrolyte by direct and pulse current (DC and PC) plating methods, and the effect of current density is investigated. The tribological tests were performed by a reciprocating ball-on disk apparatus sliding against M50 steel ball (Ø 10 mm). The wear tests were carried out at different sliding velocities of 50 mm/s, 100 mm/s and 150 mm/s by using a constant load. Increasing sliding velocity resulted in increasing wear rate in DC produced coatings but decreasing in PC co deposited materials.
