FRCU - GIS: Grupo de Ingeniería de Superficies
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Item Plasma surface engineering to enhance wear and corrosion resistance of stainless steels(2014-11-11) Brühl, Sonia PatriciaA brief description of the research lines of the Surface Engineering Group of UTN will be presented, as well as some important results obtained in the last years concerning plasma nitriding of austenitic stainless steel and different DLC carbon coatings deposited over nitrided martensitic stainless steels.Item Characterization of thick and soft DLC coatings deposited on plasma nitrided stainless steel(2014-09-15) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Heim, Daniel; Forsich, ChristianThick and soft DLC coatings were deposited by PACVD with a DC pulsed discharge on nitrided and non nitrided austenitic stainless steel. The films were characterized by EDS and Raman, hardness was assessed with nanoindenter and the microstructure was analyzed by Optical Microscopy, SEM and XRD.Item Corrosion resistance of AISI 316L stainless steel nitrided by three different plasma assisted techniques(2014-07-23) Manova, Darina; Mändl, Stephan; Brühl, Sonia Patricia; Escalada, Lisandro; Simison, SilviaPlasma assisted surface modification methods have been used to nitride stainless steels in order to enhance and therefore the lifetime of industrial components. Nevertheless, the corrosion resistance is not always preserved since it is very sensitive to the process parameters, either in implantation or in thermochemical diffusion techniques. AISI 316L stainless steel was plasma nitrided using three different techniques: low energy ion implantation (LEII), plasma immersion implantation (PI3) and convencional DC pulsed plasma nitriding (DCPN). For each method sveral parameters were tested and some of them were selectedto achieve the so called S phase of about 3 um thickness and no nitrides precipitation. The nitrided layer was characterized with OM and SEM. Hardness wass assessed on the surface with Vickers indenter and 25 g load. XRD was performed to characterize The S phase and to detect other phases if present and electrochemical corrosion tests were carried out in 3.5% NaCI solution. Although the S phase thickness in the three groups of samples was comparable, hardness was not and neither wasthe corrosion resistance. The PI3 samples were he hardest with the best performance in corrosion experiments, resulting in a higher breakdown potencial and lower currents.Item Corrosion resistance of DLC hard coatings deposited over nitrided PH stainless steel(2014-07-23) Cabo, Amado; Trava-Airoldi, Vladimir Jesús; Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Pereira, Lânia AuxiliadoraIn this work a DLC film was deposited over ion nitrided PH stainless steel Corrax® with a Si interlayer in a CVD Plasma, where the plasma was generated and sustained by an asymmetric pulsed DC discharge. A nitrided sample was compared in all tests with a DLC coated sample and a duplex one (nitrided+coating). Nitriding has been carried out in an industrial facility with a pulsed DC discharge.Item Influence of inclusions on the corrosion attack of plasma nitrided austenitic stainless steel(2013-09-08) Escalada, Lisandro; Brühl, Sonia Patricia; Suárez Vallejo, Sebastián; Guitar, María Agustina; Manova, Darina; Mändl, Stephan; Simison, SilviaAustenitic stainless steels are well known for their good localized corrosion resistance. They are commonly employed in components and instruments in the food and beverage, as well as chemical, oil and medical industries. However their use in some applications is limited due to their poor tribological properties.Item Comparison of wear and corrosion behavior of three different nitriding methods on AISI 316L stainless steel(2013-07-05) Dalibón Bähler, Eugenia Laura; Vaca, Laura Silvia; Brühl, Sonia Patricia; Simison, Silvia; Escalada, Lisandro; Manova, Darina; Mändl, Stephan; Neumann, HorstIn this work, AISI316L stainless steel was nitrided using three different processes: Low Energy Ion Implantation (LEII), Plasma Immersion Ion Implantation (PI3) and DC Pulsed Plasma Nitriding (DCPPN). The process temperature was chosen between 390 and 430 °C in all processes with the aim of preserving their corrosion resistance.Item Wear resistance of nitrided and DLC coated PH stainless steel(2013-05-27) Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Trava-Airoldi, Vladimir JesúsIn this work PH stainless steel Corrax(R) was ion nitrided and coated with DLC in a CVD process.Item Corrosion and wear properties of plasma nitrided 316L stainless steel(2018-09-28) Brühl, Sonia Patricia; Simison, Silvia; Escalada, Lisandro; Manova, Darina; Maendl, Stephan; Vaca, Laura Silvia; Soldera, Flavio; Guitar, María AgustinaSince 2010, in the frame of the European SUMA2 project and the binational project, the University of Saarland (Saarbrucken, Germany), the Leibniz Institute (Leipzig, Germany), INTEMA (Mar del Plata, Argentina) and the UTN-FRCU (Concepción del Uruguay, Argentina) have worked in collaboration to developed and characterize the successful nitriding of austenitic stainless steels by dierent plasma assisted techniques such as Plasma Immersion Ion Implantation (PI3), DC Pulsed Plasma Nitriding and Low Energy Ion Implantation (LEII) XRD have been performed in order to characterize the structure of the surface layers.Item Influence of the silicon interlayer deposition process in the adhesion of the DLC coatings deposited on nitrided martensitic stainless steel(2017-08-25) Dalibón Bähler, Eugenia Laura; Lugo González, Dubrazkha Carolina; Ramírez Ramos, Marco Antonio; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia PatriciaThe DLC coatings are characterized by good wear resistance, low friction coefficient and chemical inertness [1]. However, they have adhesion problems when they are deposited on metallic substrates. For this reason, a thin interlayer of different materials, such as silicon, is deposited previous to the coating in order to improve the adhesion. There are a few studies about the influence of the conditions of the silicon interlayer deposition on adhesion or properties of the coatings [2,3]. In this work, the adhesion of DLC coatings deposited on nitrided and non-nitrided martensitic stainless steel, modifying the silicon interlayer bias potential deposition, is studied.Item Microstructure and wear behavior of TiN coatings deposited on nitrided stainless steel by PBII&D(2017-09-14) Vaca, Laura Silvia; Quintana, Juan Pablo; Vega, Daniel; Moscatelli, Mauro Nicolás; Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Márquez, Adriana BeatrizThis work presents the wear behavior of TiN coatings obtained by cathodic arc discharge combined with implantation and temperature on AISI 316L stainless steel previously ion nitrided.