Abstract

BERMEO-ACOSTA, Franklin  and  CASTRO-NARVAEZ, Sandra. Distribution of profiles and macroparticles in coatings obtained by continuous cathodic arc using a straight magnetic concentrator. Dyna rev.fac.nac.minas [online]. 2020, vol.87, n.214, pp.37-45.  Epub Oct 30, 2020. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v87n214.83929.

Thin films of Ti and Cu were deposited in 316 stainless steel substrates by using the continuous cathodic arc technique and a magnetic concentrator in a straight duct. Samples were obtained at different cathode-substrate distances for positions within the magnetic concentrator. The morphology of the surface was determined by electron scanning microscopy (SEM). The average thickness of the films was measured from the deposited mass; the profiles of the films were also studied from measurements with a Calotest at different points of the samples by using a profilometer. The coefficient of friction and the coefficient of wear were characterized with a tribomete and the hardness with a nanoindenter. The results show that the profiles of the coatings are not uniformly distributed, with a central region of maximum thickness decreasing towards the ends by up to 50%. The films show the presence of macroparticles that decrease with increasing axial positions; the coefficient of friction and the coefficient of wear rate decreased when the substrate was placed further from the cathode. The highest values of hardness, the lowest coefficient of friction and the lowest coefficient of wear were obtained in the region where the magnetic field is the highest.

Keywords : cathodic arc; magnetic concentrator; perfilometer; macroparticles.

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