Open Access
Improved adhesion of cathodic arc PVD AlCrSiN coating on ion-implanted WC-Co substrates
(Elsevier, 2023) Ortiz Membrado, Laia; García-González, Sandra; Orrit-Prat, Jordi; Bonet, Raül; Caro, Jaume; Fernández de Ara, Jonathan; Almandoz Sánchez, Eluxka; Llanes, Luis; Jiménez-Piqué, Emilio; Ciencias; Zientziak
Ion implantation has been shown to improve adhesion strength of AlCrSiN coatings due to a synergic enhancement on fracture toughness and load bearing capability of the substrate that can potentially increase the in-service efficiency of coated cutting tools. In this work, AlCrSiN coatings deposited by PVD on WC-Co substrates implanted with Ti, Cr and N ion species have been processed. The mechanical properties and adhesion have been characterized by contact techniques and the residual stress of the coatings and substrates have been evaluated using FIB-DIC technique and Vickers indentation tests, respectively. An improvement of adhesion strength is obtained for treated substrates, especially for those implanted with titanium and chromium ions. This improvement is attributed to the introduction of residual stresses in the substrate, which increases its fracture toughness and enhances its load bearing capability.
Open Access
Comparative study of mechanical performance of AlCrSiN coating deposited on WC-Co and cBN hard substrates
(MDPI, 2023) Liang, Jing; Serra, Marc; Gordon, Sandra; Fernández de Ara, Jonathan; Almandoz Sánchez, Eluxka; Llanes, Luis; Jiménez-Piqué, Emilio; Ciencias; Zientziak
The objective of this study is to explore and compare the mechanical response of AlCrSiN coatings deposited on two different substrates, namely, WC-Co and cBN. Nano-indentation was used to measure the hardness and elastic modulus of the coatings, and micro-indentation was used for observing the contact damage under Hertzian contact with monotonic and cyclic (fatigue) loads. Microscratch and contact damage tests were also used to evaluate the strength of adhesion between the AlCrSiN coatings and the two substrates under progressive and constant loads, respectively. The surface damages induced via different mechanical tests were observed using scanning electron microscopy (SEM). A focused ion beam (FIB) was used to produce a cross-section of the coating–substrate system in order to further detect the mode and extent of failure that was induced. The results show that the AlCrSiN coating deposited on the WC-Co substrate performed better in regard to adhesion strength and contact damage response than the same coating deposited on the cBN substrate; this is attributed to the lower plasticity of the cBN substrate as well as its less powerful adhesion to the coating.
Open Access
Mechanical performance of AlCrSiN and AlTiSiN coatings on inconel and steel substrates after thermal treatments
(MDPI, 2022) Liang, Jing; Almandoz Sánchez, Eluxka; Ortiz Membrado, Laia; Rodríguez Lozano, Rafael; Fernández de Ara, Jonathan; García Fuentes, Gonzalo; Llanes, Luis; Jiménez-Piqué, Emilio; Ciencias; Zientziak; Ingeniería; Ingeniaritza; Institute for Advanced Materials and Mathematics - INAMAT2
The objective of this study was to explore the mechanical properties of AlCrSiN and AlTiSiN coatings deposited on Inconel and steel substrates after thermal treatments of 500 °C and 800 °C. Nanoindentation was used to measure the hardness and elastic modulus of the coatings, and microindentation was used for observing the contact damage with Hertzian contact loadings. Microscratch and Mercedes tests were used to evaluate the adhesive strength between coating and substrate with both progressive and static loads, respectively. The surface damage was inspected by optical microscopy and scanning electron microscopy (SEM). Focus ion beams (FIB) were used to mill the cross-sections in order to detect the extent and mode of failure. The results show that AlCrSiN coatings and Inconel substrates exhibit better mechanical performance, even after thermal treatments.
Open Access
Comparative study of tribomechanical properties of HiPIMS with positive pulses DLC coatings on different tools steels
(MDPI, 2021) Claver Alba, Adrián; Jiménez-Piqué, Emilio; Almandoz Sánchez, Eluxka; Fernández de Ara, Jonathan; Fernández, Iván; Santiago, José A.; Barba Areso, Eneko; García Lorente, José Antonio; Ingeniaritza; Institute for Advanced Materials and Mathematics - INAMAT2; Ingeniería
Diamond-like carbon (DLC) coatings are very interesting due to their extraordinary properties; their excellent wear resistance, very low friction coefficient, great hardness, high elastic modulus or biocompatibility can be highlighted, as can their multifunctionality. Because of this, over recent decades they have been widely used in tribological applications, improving the performance and the useful life of machining tools in an effective way. However, these coatings have a disadvantage compared to other coatings deposited by commercially available techniques-their resultant adhesion is worse than that of other techniques and limits their industrial applications. In this work, tribological results of a scratch test, wear resistance and nanoindentation of tetrahedral amorphous carbon (ta-C) and tungsten carbide:carbon (WC:C) DLC coatings deposited by means of novel highpower impulse magnetron sputtering (HiPIMS) technology with positive pulses are reported. The coatings were deposited in three different tools steels: K360, vanadis 4 and vancron. These tools' steels are very interesting because of their great and wide industrial applicability. Experimental results showed excellent tribological properties, such as resistance to wear or adhesion, in the two types of DLC coatings.

Almandoz Sánchez, Eluxka

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