Facultad Regional Concep. del Uruguay
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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 Comportamiento mecánico de un recubrimiento DLC depositado sobre acero inoxidable martensítico previamente nitrurado(2013-05-07) Dalibón Bähler, Eugenia Laura; Charadía, Raúl; Cabo, Amado; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia PatriciaEn este trabajo se estudió el comportamiento tribológico de un film de DLC que fue depositado sobre acero inoxidable martensítico AISI 420 nitrurado, con dos terminaciones superficiales diferentes, previas a la nitruración iónica, analizando los resultados en función del acabado superficial.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 Comportamiento mecánico de un recubrimiento DLC sobre acero AISI 420 nitrurado por plasma con diferentes terminaciones superficiales(2013-02-25) Brühl, Sonia Patricia; Charadía, Raúl; Dalibón Bähler, Eugenia Laura; Trava-Airoldi, Vladimir Jesús; Cabo, AmadoEn este trabajo se estudió el comportamiento tribológico de un film de DLC depositado sobre acero inoxidable martensítico.Item DLC multilayers to improve fretting and corrosion resistance over nitrided martensitic stainless steel(2018-09-20) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Trava-Airoldi, Vladimir JesúsIn this work, the fretting wear and corrosion behavior of DLC multilayers coatings were studied and compared to the monolayer coating.Item Carbon based coatings deposited on stainless steel : study of thermal degradation(2017-03-02) Dalibón Bähler, Eugenia Laura; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia Patricia; Ghafoor, Naureen; Rogström, Lina; Odén, MagnusAmorphous hydrogenated carbon (DLC) coatings have a high hardness depending on the relative amount of sp3/sp2 bondings. They also exhibit an extremaly low friction coefficient and are chemically inert. However, these coatings have some disadvantages which limit their applications. For instance, adhesion is poor when are deposited on metallic substrates and they are also unstable at high temperatures, degrading into graphite and loosing hardness. in this work, DLC coatings were deposited on presipitation hardening stainless steel (PH Corrax) which was plasma nitrided before the coating deposition. The samples were submitted to annealing treatments for an hour at different temperatures from 200 to 600ºC, together with a control group, wich was only coated but not nitrided. After each annealing cycle, Raman Spectroscopy, nanoindentation and microscopy were used to check fil properties. It was demonstrated that the nitriding pretreatment improved not only adhesion but also the thermal stability of the DLC, slowing degradation and preventing delamination.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 Mechanical and corrosion behaviour of DLC and TiN coatings deposited on martensitic stainless steel(2017-09-10) Dalibón Bähler, Eugenia Laura; Pecina, Jorge Nahuel; Moscatelli, Mauro Nicolás; Ramírez, Marco Antonio; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia PatriciaThe objective of this work is to compare the wear, friction, adhesion and corrosion behaviour of commercial TiN and DLC coatings deposited on AISI 420 stainless steel.Item Mechanical properties and corrosion behaviour of DLC monolayers and multilayers deposited over nitrided martensitic stainless steel(2019-09-24) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Cabo, Amado; Trava-Airoldi, Vladimir JesúsDLC coatings have unique properties such as very low coefficient of criction and chemical inertness and they are used extensively as protection and solid lubricants in many industrial applications. Nevertheless, adhesion over certain substrates like stainless steel has many unresolved issues, as well as corrosion mechanisms are not well understood.Item Estudio del comportamiento mecánico de recubrimientos DLC multicapa depositados sobre el acero inoxidable martensítico nitrurado(2019-10-02) Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Cabo, Amado; Pecina, Jorge Nahuel; Trava-Airoldi, Vladimir Jesús; Caballero, Mario AlbertoEl acero inoxidable martensítico AISI 420 posee diferentes aplicaciones en la industria donde se requiere buena resistencia al desgaste y a la corrosión. Para mejorar sus propiedades superficiales, algunos tratamientos pueden ser aplicados como recubrimientos “Diamond Like Carbon” (DLC) que se caracterizan por su buena resistencia al desgaste, bajo coeficiente de fricción y ser químicamente inertes. Sin embargo presentan problemas de adhesión cuando son depositados sobre sustratos metálicos entonces un pretratamiento como la nitruración asistida por plasma puede resultar conveniente.