Browsing by Author "Quintana, Juan Pablo"

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    Adhesión de recubrimientos PVD sobre AISI 4140 previamente nitrurado para la industria petrolera
    (2019-09-06) Quintana, Juan Pablo; Uccellini Bermúdez, Massimo Nicola; Tabares, Ignacio Javier; Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura
    Se presentarán y compararán los resultados de adhesión de muestras recubiertas con nitruro de titanio aluminio (TiAlN) con interfase de TiAl con y sin implantación iónica, carbonitruro de titanio en dos proporciones distintas N2/C2H2 y recubrimientos bicapa de Ti/TiN. Como conclusión, vemos que los recubrimientos de Nitruro de titanio aluminio, depositados con implantación iónica fueron los más satisfactorios tanto al scratch test como a la indentación.
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    Desgaste por fretting en un recubrimiento de nitruro de titanio depositado sobre de AISI 316L nitrurado
    (2021-10-05) Vaca, Laura Silvia; Quintana, Juan Pablo; Maskavizan, Ana Justina; Cabana Aranda, Federico Ezequiel; Márquez, Adriana Beatriz; Brühl, Sonia Patricia
    Los aceros inoxidables austeníticos son requeridos para su uso en ambientes agresivos debido a su excelente resistencia a la corrosión, pero a fin de ampliar el rango de aplicación es necesario tratarlos superficialmente para elevar su dureza y mejorar su resistencia al desgaste. Si entre dos componentes de un sistema que están en contacto se origina un movimiento oscilatorio de pequeña amplitud es posible que se produzca desgaste por fretting, lo que podría causar una falla que afecte su funcionamiento. El objetivo de este trabajo es evaluar el comportamiento al desgaste por fretting de recubrimientos de TiN depositados por arco catódico sobre acero inoxidable AISI 316L nitrurado por plasma. Se compararon los volúmenes desgastados de un recubrimiento comercial de TiN y recubrimientos bicapa de Ti-TiN combinando éste con implantación iónica. Como referencia fueron evaluadas muestras solamente nitruradas y el acero sin tratar. El ensayo se realizó durante 15, 30 y 60 minutos con una carga de 5 N y se utilizó como contraparte una bolilla de alúmina de 6 mm. Para los ensayos de mayor tiempo los volúmenes desgastados de los recubrimientos no mostraron diferencias y resultaron al menos 40% menores que los de las muestras nitruradas y 70% menores que los del acero sin tratar. Sin embargo, para los ensayos de 15 minutos, los recubrimientos bicapa de Ti-TiN combinados con implantación iónica presentaron el mejor comportamiento al desgaste por fretting, al obtener un menor volumen desgastado y no dejar expuesto al sustrato.
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    Estudio de la adhesión y resistencia a la corrosión de recubrimientos por deposición física de vapores asistidos por plasma sobre acero AISI 4140 previamente nitrurado
    (2019-11-03) Scarbol, Luisina; Vaca, Laura Silvia; Brühl, Sonia Patricia; Quintana, Juan Pablo
    En este trabajo se estudia la adhesión y la resistencia a la corrosión de cuatro tipos de recubrimientos PAPVD (Plasma Assisted Physical Vapour Deposition) crecidos por arcos catódicos sobre acero AISI 4140 previamente nitrurado por plasma. Estos procesos combinados se conocen como tratamientos “dúplex” y exhiben excelentes propiedades mecánicas, ya que proveen valores elevados de dureza y una gran capacidad de soporte de carga.
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    Estudio del comportamiento a la corrosión de recubrimientos duros crecidos por arco catódico sobre AISI 4140 con nitrurado iónico
    (2019-09-06) Scarbol, Luisina; Quintana, Juan Pablo; Pecina, Jorge Nahuel; Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia
    El acero AISI 4140 posee muchas aplicaciones industriales. La nitruración iónica es un tratamiento que se utiliza con el propósito de mejorar sus propiedades mecánicas, pero frecuentemente su resistencia a la corrosión se ve comprometida. En este trabajo se compara el comportamiento a la corrosión entre el acero AISI 4140 nitrurado y el mismo con tres diferentes tipos de recubrimientos. Esto se debe a que no hay suficientes estudios para determinar si tales recubrimientos afectan el comportamiento a la corrosión.
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    Estudios tribológicos y de resistencia a la corrosión de recubrimientos T/TICNX1-X sobre AISI 4140 nitrurado
    (2022-05-02) Quintana, Juan Pablo; Dalibón Bähler, Eugenia Laura; Farina, Silvia Beatriz; Lamas, Diego Germán; Brühl, Sonia Patricia; Márquez, Adriana Beatriz
    En este trabajo se crecieron recubrimientos de base titanio en presencia de nitrógeno y/o acetileno con una intercapa de Ti empleando un equipo de arco catódico. Se empleó como sustrato acero AISI 4140 templado, revenido y nitrirado iónicamente. Se estudió la estructura cristalina de los recubrimientos mediante difracción de rayos X. Se evaluó la resistencia al desgaste y el coeficiente de fricción con ensayos de pink on disk. la corrosión fue evaluada mediante ensayos potenciodinámicos en una solución de cloruro de sodio.
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    Evaluation of wear and corrosion resistance in acidic and chloride solutions of PVD-CrN coatings on untreated and plasma nitrided AISI 4140 steel
    (2024-05-24) Maskavizan, Ana Justina; Quintana, Juan Pablo; Dalibón Bähler, Eugenia Laura; Márquez, Adriana Beatriz; Brühl, Sonia Patricia; Farina, Silvia Beatriz
    CrN coatings deposited by Physical Vapor Deposition (PVD) are widely used due to their high hardness and high wear resistance, low friction coefficient and superior corrosion resistance. The latter makes this coating appropriate for protecting forming tools, moulds and components used in chemical processing. In this work, single layer CrN coatings were deposited on plasma nitrided and non treated AISI 4140 steel. The influence of nitriding on the wear resistance, coefficient of friction and corrosion resistance in acidic solutions and chloride solutions was studied. Thickness of the coatings was measured using optical microscopy, and surface hardness was assessed with a Vickers microindenter. Adhesion was determined using Rockwell indentation applying 150 kg and scratch test as well as Scratch test at different constant loads. Sliding wear resistance was studied with Pin-on-Disk tests under different normal loads and sliding distances, the coefficient of friction was registered during the tests and volume loss was calculated. Corrosion test were carried out using a 3.5 % NaCl solution and a 0.5 M H2SO4 solution as electrolytes. Nitrided steel without any coating was used also as comparison. Coating thickness was approximately (2.6 ± 0.4) μm and surface hardness reached a value of (1960 ± 160) HV0.05, being this a composed hardness because of the low film thickness. Adhesion was good for both substrates, non nitrided and nitrided steel, in both cases, it could be classified as HF1 according to VDI 3198 standard. In the case of the Scratch test, in the only coated samples, without nitriding as pre treatment the film cracking was observed at 50 N in the track, whereas in the duplex sample the coating had a better load bearing capacity and reached 70 N without damage. No delamination was detected around the scratch track in all cases. Wear volume loss was undetectable in the pin-on-disk test for the coated systems, whereas it was approximately 30 x 10-3 mm3 for the nitrided steel and 150 x 10-3 mm3 for the untreated steel. In the corrosion tests, the coating showed a passive behaviour as tested in NaCl solution and the corrosion current density was significantly lower for coated samples in the H2SO4 solution, proving that the CrN coating is suitable for protecting steel substrate in both chloride and acidic media.
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    Influence of the pre-treatments and process temperature on the adhesion of TiN films deposited by PBII&D over nitrided austenitic stainless steel
    (2019-10-28) Vaca, Laura Silvia; Quintana, Juan Pablo; Guitar, María Agustina; Vega, Daniel; Brühl, Sonia Patricia; Márquez, Adriana Beatriz
    In this work the influence of pre-treatment cleaning processes in the adhesion of TiN films deposited by the plasma based ion implantation and deposition (PBII&D) process over plasma nitrided AISI 316L stainless steel was investigated, varying the gas composition, the duration of the sputtering process and the temperature in the same deposition chamber. The TiN film morphology was scrutinized with scanning electron microscopy on the surface complemented with focus ion beam for the cross section. The film microstructure was characterized with X ray diffraction. The adhesion of the coatings was studied using the Scratch Test with constant load at different values and the Rockwell C indentation method as well. It was found that only with the sputtering carried out in a H - Ar gas mixing at 300 ºC temperature used as pre-treatment was successful to prepare the nitrided surface for the subsequent TiN deposition by the PBII&D process.
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    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 Beatriz
    This 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.
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    Tribological and corrosion Behavior of Duplex Coated AISI 316L using plasma based ion implantation and deposItion
    (2020) Vaca, Laura Silvia; Quintana, Juan Pablo; Vega, Daniel; Márquez, Adriana Beatriz; Brühl, Sonia Patricia
    The implementation of a duplex process, which combines plasma nitriding with hard coatings obtained by cathodic arc, on stainless steel substrates has faced adhesion problems that affected the wear and corrosion behavior of the treated surfaces. One variation of the cathodic arc process, which could improve the adhesion, is its combination with plasma ion implantation. This work presents results of the wear and corrosion behavior of duplex TiTiN bilayer coatings obtained by cathodic arc deposition combined with ion implantation (PBII&D) on plasma nitrided AISI 316L stainless steel In order to compare the application of PBII&D in duplex processes against conventional cathodic arc deposition, other two types of samples were obtained; one group of samples was coated using the same experimental device with the substrate at floating potential and the other one with a commercial PVD system. The coatings were characterized by SEM, XRD, and nanoindentation. The adhesion was evaluated by the Scratch Test and Rockwell C indentation. The wear resistance was analyzed by the pin-on-disk test and the corrosion behavior was evaluated by means of anodic polarization tests in NaCl solution, as well as by the Salt pray Fog Test. The PBII&D bilayer coatings showed better adhesion while the commercial PVD TiN coatings presented the smallest wear volume loss, but the delamination inside and around the track evidenced adhesion problems. Corrosion resistance was improved in all coatings benchmarked against nitride substrates, but PBII&D processes offered better protection.