Browsing by Author "Kleiman, Ariel"
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Item 1020 steel coated with Ti/TiN by Cathodic Arc and Ion Implantation(Institute of Physics Publishing, 2017-03-08) Bermeo, F.; Quintana, Juan Pablo; Kleiman, Ariel; Sequeda, Federico O.; Márquez, Adrianna BeatrizTiN coatings have been widely studied in order to improve mechanical properties of steels. In this work, thin Ti/TiN films were prepared by plasma based immersion ion implantation and deposition (PBII&D) with a cathodic arc on AISI 1020 steel substrates. Substrates were exposed to the discharge during 1 min in vacuum for the deposition of a Tiunderlayer with the aim of improving the adhesion to the substrate. Then, a TiN layer was deposited during 6 min in a nitrogen environment at a pressure of 3xl0-4 mbar. Samples were obtained at room temperature and at 300 °C, and with or without ion implantation in order to analyze differences between the effects of each treatment on the tribological properties. The mechanical and tribological properties of the films were characterized. The coatings deposited by PBII&D at 300 °C presented the highest hardness and young modulus, the best wear resistance and corrosion performance. © Published under licence by IOP Publishing Ltd.Item Characterization of titanium films deposited with a cathodic arc using a straight magnetic duct(Institute of Physics Publishing, 2014-01-01) Bermeo, F.; Torre, Delia H; Kleiman, Ariel; Minotti, Fernando O.; Márquez, Adrianna BeatrizNanostructured Ti films were obtained employing a cathodic arc with a straight magnetic filter. The films were characterized using X-ray diffraction, scanning electron and atomic force microscopy. The films were found to be dense and with columnar grains, whose size increased with the exposure time. The number of macroparticles, the film roughness and the deposition rate were also analyzed, and the latter compared with the results of a fluid plasma model. Number of macroparticles and film roughness in samples located ahead of the magnetic duct inlet were higher than those determined from samples placed inside the magnetic duct. The deposition rate depended on the axial and radial position inside the duct. The thickness along the radial position was more uniform for samples located at axial positions near the filter extremes, but the mean deposition rate was lower at these positions. Measured and modeled deposition rates agreed reasonably well.