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

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JUNE 26 MONDAY MORNING RIVA-TF.MoM-OR.5 LOW TEMPERATURE DEPOSITION OF TIB 2 ON X40 CRMOV 5 1 STEEL SUBSTRATE BY DC MAGNETRON SPUTTERING. A. Duarte 1,2 *, B. Coelho 2 , M. Vila 2 , A.J.S. Fernandes 3 , F. Oliveira 2 , F.M. Costa 3 R.F. Silva 2 . 1 - Laboratório - F. Ramada, Aços e Industrias, S.A., Apartado 10, 3880-909 Ovar, Portugal. e-mail: paulo.duarte@ramada.pt 2 - CICECO - Dept. of Ceramics & Glass Engineering, University of Aveiro, 3810-193 Aveiro- Portugal 3 - Dept. of Physics, University of Aveiro, 3810-193 Aveiro- Portugal Titanium diboride (TiB 2 ) films are being investigated due to their promising uses not only in electronic devices but also for mechanical purposes. Its excellent corrosion resistance and chemical stability, as well as high hardness and wear resistance makes TiB 2 particularly suitable for aluminium processing (e.g. extrusion, die-casting and machining). The major concern about protective coatings is lack of adhesion to the substrate arising from the high residual stresses developed during film deposition. In the present work TiB 2 coatings were produced by non-reactive magnetron sputtering from a TiB 2 target on Orvar Supreme tool steel substrate (also know as AISI H13 premium or X40 CrMoV 5 1). Two different substrate types were used, similar to those frequently found on the aluminium injection industry: quenched and tempered/nitrided. The deposition parameters, namely the target/substrate distance, emission and bias currents, were varied in order to obtain adhered and well structured films, suiting the substrates composition and microstructure. The coatings were characterized by X-Ray diffraction, Scanning electron microscopy/EDS, Scratch test and AFM. The results obtained show that TiB 2 can be grown on the steel substrate at low temperature with high deposition rate keeping some crystallinity degree. Depending on the experimental parameters it is possible to coat hot work tool steel with adherent TiB 2 thin films by DC sputtering. *corresponding author 24
JUNE 26 MONDAY MORNING RIVA-TF-MoM-OR.4 Ta 2 O 5 THIN FILMS PREPARED BY EVAPORATION AND IBAD METHODS: CHARACTERIZATION AND WETTING BEHAVIOUR UNDER UV IRRADIATION. V. Rico, J.P. Espinós, F. <strong>Yubero</strong>, F. Frutos*, A.R. González-Elipe. Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla). Avda. Américo Vespucio s/n. 41092 Sevilla (Spain). *Dpto. Física Aplicada I, ETS Ingeniería Informática. Avda. Reina Mercedes s/n. 41012 Sevilla (Spain) Ta 2 O 5 thin films have been prepared by evaporation from a tantalum oxide precursor and by assisting the growth of the films by oxygen and nitrogen ion bombardment (IBAD). The obtained thin films depict different microstructures and optical and dielectric properties. In general, the films prepared by evaporation have lower refraction indices that those prepared by IBAD. In this case a clear correlation exists between the ion current and energy and the properties of the films. The trend of dielectric properties of these thin films agrees with that defined by their optical properties. They also agree with the microstructrue of the films as determined by SEM. A particular type of films was found when prepared by evaporation under grazing conditions. These films depict a columnar microstructure with oblique columns and an extremely high porosity. Refraction indices ranging from 1.7 to 1.2 have been obtained for these thin films. Another interesting property of these thin films refers to its wetting behaviour under UV light. In literature there are many papers dealing with the conversion of the TiO 2 surface from partially hydrophobic into fully hydrophilic by UV irradiation. In this work we also show that Ta 2 O 5 thin films present a similar behaviour changing from hydrophobic into hydrophilic by illumination. A careful study of this type of transformation is being carried out as a function of the microstructural and structural properties of the films. Doping of Ta 2 O 5 thin films with foreign cations and with nitrogen has revealed to be an effective way to induce a partial change in wetting angle by using visible light for the illumination. 23
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