Open Access
Estudio comparativo de las propiedades tribomecánicas de recubrimientos DLC depositados mediante HIPMINS con pulsos positivos sobre aceros herramientas
(2020) Claver Alba, Adrián; García Lorente, José Antonio; Escuela Técnica Superior de Ingeniería Industrial, Informática y de Telecomunicación; Industria, Informatika eta Telekomunikazio Ingeniaritzako Goi Mailako Eskola Teknikoa
Los recubrimientos DLC(Diamond Like Carbon)tienen gran importancia en la actualidad gracias a que combinan excelentes propiedades; como una dureza relativamente alta y coeficiente de fricción muy bajo, con la posibilidad de personalizar las propiedades utilizando elementos dopantes como Cr, W, Si o H entre otros en su composición. Uno de los problemas de este tipo de recubrimientos es que su adherencia no es tan buena como la de otros recubrimientos PVD. En este estudio se analizarán las propiedades tribomecánicas (adhesión, nanodureza, resistenciaal desgaste...) de recubrimientos DLC mediante el empleo del innovadorsistema de HIPIMScon pulsos positivos depositados sobre diferentes aceros herramienta. Este sistema mejora la adherencia de los recubrimientos con el substrato; aumentando así su interés industrial. Por tanto, el trabajo se centrará en la realización, análisis y comparación de los resultados de ensayos de nanoindentación, scratch test, fricción y desgaste.Los ensayos se llevaron a cabo sobre 3 aceros herramienta; vanadis-4, vancron yK-360, recubiertos con los DLC ta-Cy WC:C. Los aceros seleccionados son de gran interés por su aplicabilidad industrial y los recubrimientos mejoran considerablemente las propiedades tribológicas y la dureza superficial.Los resultadosobtenidos de los ensayos han mostrado un extraordinario comportamiento tribológico y mecánico de los recubrimientos; con valores de carga crítica LC3 en el scratch test superiores a los 70 N en alguno de los casos, durezas de entre 15 y 27 GPa dependiendo del recubrimientoy valores muy bajos de resistencia al desgaste en todos ellos.
Open Access
Study of the industrial application of diamond-like carbon coatings deposited on advanced tool steels
(MDPI, 2024) Barba Areso, Eneko; Claver Alba, Adrián; Montalá, Francesc; Luis Pérez, Carmelo Javier; Sala, Neus; Colominas, Carles; García Lorente, José Antonio; Ingeniería; Ingeniaritza
The utilization of diamond-like carbon (DLC) coatings has emerged as a promising strategy to enhance the performance, durability, and functionality of industrial tools and components. Recognized for their exceptional attributes such as hardness, wear resistance, low friction, and biocompatibility, DLC coatings have achieved widespread acclaim for their potential to improve the capabilities of tool steels for different applications. This present study shows a comprehensive investigation into the application of DLC coatings on a diverse range of tool steel substrates, encompassing 1.2379, 1.2358, Caldie, K340, HWS, and Vanadis 4. The main aim is to show the effects of DLC coatings on these substrates and to provide an in-depth analysis of their properties during forming processes. Furthermore, this study explores the practical utilization of DLC-coated tool steel components, with a particular focus on their role in cold forming dies. Additionally, the study reviews the application of duplex treatments involving plasma nitriding to enhance DLC coating performance. To sum up, this study pursues a threefold objective: to investigate DLC coatings’ performance on diverse tool steel substrates; to assess the potential for improvement through nitriding; and to evaluate the behavior of DLC coatings in the cold stamping of S235 steel, which is of great technological and industrial interest to the cold forging sector.
Open Access
Corrosion and tribological performance of diamond-like carbon-coated ZK 60 magnesium alloy
(MDPI, 2023) Claver Alba, Adrián; Fernández, Iván; Santiago, José A.; Díaz-Rodríguez, Pablo; Panizo-Laiz, Miguel; Esparza Gorráiz, Joseba; García Fuentes, Gonzalo; Zalakain Iriazabal, Iñaki; García Lorente, José Antonio; Institute for Advanced Materials and Mathematics - INAMAT2
In this work, hydrogenated and hydrogen-free Diamond-Like Carbon (DLC) coatings were deposited into ZK60 magnesium alloy using the promising coating method High-Power Impulse Magnetron Sputtering (HiPIMS). CrC and WC were used as interlayers of the thin films, and their influence was studied. The structure and composition of the coatings were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. Tribological tests, scratch tests, and nanoindentation were performed to obtain information about the mechanical and tribological properties of the coatings. Finally, immersion and electrochemical tests were performed to evaluate the corrosion behavior of the samples. The results showed a homogeneous layer with improved wear resistance, toughness, and hardness in addition to good adhesion to the substrate of the ZK60 magnesium alloy. The hydrogenated DLC coating showed better results that the hydrogen-free thin layer, and relevant differences were observed depending on the interlayer. In this work, the improvement in the tribological and corrosive properties of Mg alloys was studied by using thin layers of DLC and different intermediate layers, achieving similar or even better wear and adhesion values than with thicker layers.

Claver Alba, Adrián

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