Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

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JUNE 26 MONDAY MORNING ETCHC.MoM.-OR.4 TRIBO-MECHANICAL PROPERTIES OF CrAlN COATINGS DOPED WITH YTTRIUM AND ZIRCONIUM. M. Brizuela, D. González, A. García-Luis, P. Corengia. Fundación INASMET-Tecnalia, Paseo de Mikeletegi 2, 20009 San Sebastián, Spain The aim of this work is to study the influence of doping with Y and Zr on the mechanical and tribological behaviour of CrAlN coatings. CrAlN coatings doped with Y and Zr were prepared on high-speed steel (AISI M2) and Si (100) substrates by d.c. magnetron sputtering using a commercial equipment (CemeCon® CC800/8) provided of four targets, two of chromium, one of aluminium, and one of the doping material (yttrium or zirconium) in a mixture of argon and nitrogen. The influence of different deposition parameters (e.g.: Ar/N 2 ratio, temperature, doping target power,) on the chemical, mechanical and tribological properties was analysed. The mechanical properties of the films was evaluated with a Fischerscope H100 dynamic microprobe apparatus using a conventional Vickers indenter at loads up to a maximum of 10 mN, to minimise the influence of the underlying base material. Adhesion testing was carried out with a conventional VTT scratch test on films deposited on polished M2 steel samples. Critical loads for adhesion were calculated by optical observation at the first cohesive or adhesive failure of the coating. The friction and wear tests have been performed in a pin-on-disk apparatus against different counterpart materials (AISI 52100 steel and Ti6Al4V alloy). Friction coefficients were continuously recorded during the tests. Wear volume and surface morphology were evaluated on worn areas of coated discs and balls after testing by means of non-contact laser surface profilometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Chemical and microstructural properties have been also investigated by EDS and SEM. The results show great differences when using different doping elements and deposition conditions. The role of the amount and type of doping element has been investigated. Hardness values up to 40 GPa have been found in the case of CrAlN coatings doped with yttrium under certain deposition conditions. The tribological behaviour has also been studied and correlated with the chemical composition and mechanical properties. 12
JUNE 26 MONDAY MORNING ETCHC-MoM-OR.3 STUDY OF HYDROGEN AND OXYGEN UPTAKE IN SMART OPTICAL WINDOWS BASED ON YPd AND MgNiPd THIN FILMS BY GDOES. E. Matveeva, E.Rayon. Centro MTM, Universidad Politécnica de Valencia, Cami de Vera s/n, E-46022 Valencia Spain. R. Escobar Galindo, J.M. Albella. Departamento Física en Ingeniería de Superficies, Instituto Ciencia de Materiales, Cantoblanco, E-28049 Madrid, Spain. The use of smart optical windows based on YPd and MgNiPd thin coatings on transparent glass, has been extensively studied in the last 15 years due to the possibilities of switching the optical and electrical properties in a reversible and controlled way. The key of the switching process is based on the absorption of hydrogen by the reflective metal, converting it to a transparent and semiconductor metal hydride. In our case, the control of the hydration is carried out by an electrochemical process in which the hydrogen ions are absorbed onto the metallic cathode. During the anodic discharge, the hydrogen is released from the metal hydride towards the alkali electrolyte where other reactions may take place (i.e. metal oxidation). These complex processes are localised in-depth the film thickness (approximately 200 nm) and at the interfaces. Incontrollable oxidation of the active films during anodic discharge depending on the position in the film of the oxide formed can block the hydrogen diffusion process and reduce hydrogenation limiting the lifetime of the devices. Therefore, it is crucial to have a detailed knowledge of the mechanisms of hydrogen and oxygen uptake and release in the films. Most of the previous studies has been done by X-ray and infrared characterisation techniques, but they do not provide depth profile information. As an alternative, in this work, we have made use of the high elemental sensitivity and nanometre depth resolution of radiofrequency Glow Discharge Optical Emission Spectroscopy (rf-GDOES) to study the depth profiles of the elements present in the films. In particular, the hydrogen and oxygen uptake and release was followed in samples subjected to different charge and discharge processes. GDOES measurements were performed after each electrochemical experiment (charging and discharging), whose kinetics was recorded,. The most representative observations of the GDOES results were: i) The resolution of the layer structure of the film (5 nm Pd/metal layer/glass), ii) the detection and monitoring of hydrogen migration in and out of the film during loading and release cycles and iii) the revelation of the enhanced oxidation of the film after an anodic discharge. The relation of these observations with the performance of the devices will be further discussed in this paper. 11
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Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

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