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evildran(½ð±Ò+1,VIP+0):лл£¡¿ÉϧÎÒ²»Èϵ𡣬ºÇºÇ 1-2 10:30
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¿´¿´ÏÂÃæÕâÆªÎÄÕÂÔõôÑù£¿ Titre du document / Document title Electrochemical and thermal oxidation of TiN coatings studied by XPS Auteur(s) / Author(s) MILOSEV I. (1) ; STREHBLOW H.-H. ; NAVINSEK B. (1) ; METIKOS-HUKOVIC M. ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s) (1) J. Stefan inst., 61111 Ljubljana Slovenia, R¨¦sum¨¦ / Abstract X-ray pbotoelectron spectroscopy (XPS) has been used to investigate the electrochemical and thermal oxidation of titanium nitride (TiN) coatings prepared by physical vapour deposition (PVD) at 200¡ãC. Electrochemical oxidation of TiN was carried out at various potentials in phthalate buffer solution (pH 5.0). Evaluation of the XPS Ti 2p and N 1s spectra showed the presence of nitride, oxynitride and oxide species in the layer formed by anodic oxidation. The electrochemical oxidation of TiN to TiO2 proceeds through the formation of a mixed oxynitride/oxide layer, which transforms into oxide (TiO2) at sufficiently positive potentials (E > 1.1 V vs. SHE). The oxidation of TiN to TiO2 is accompanied by the formation of molecular nitrogen (N2). The thickness of the oxide layer reaches ∼ 7 nm after oxidation at the highest potential (1.9 V). A complete coverage of the TiN surface by TiO2 leads to an anodic peak in the polarization curve. On the basis of angle-resolved XPS measurements, two types of oxynitride species are identified, which are distributed differently throughout the oxidized layer. X-ray photoelectron spectroscopy depth profiles of TiN oxidized at 450¡ãC and 600¡ãC in an oxygen flow reveal that at the lower temperature an oxynitride layer is formed, whereas a thick TiO2 layer appears on top of TiN at the higher temperature. The interface between the nitride and oxide phases is relatively sharp. It is suggested that the mechanism of TiN oxidation proceeds by a progressive replacement of nitrogen by oxygen. The TiN coatings can be used up to 600¡ãC as a protective coating in an oxygen atmosphere. Valance band spectra of TiN, as well as of electrochemically and thermally oxidized TiN, are presented and discussed. Revue / Journal Title Surface and interface analysis ISSN 0142-2421 CODEN SIANDQ Source / Source 1995, vol. 23, no7-8, pp. 529-539 (50 ref.) Langue / Language Anglais Editeur / Publisher Wiley, Chichester, ROYAUME-UNI (1979) (Revue) Mots-cl¨¦s anglais / English Keywords Experimental study ; Oxidation ; Electrochemical reaction ; Annealing ; Photoelectron spectroscopy ; X radiation ; Surface treatments ; Titanium nitrides ; Inorganic compounds ; Transition element compounds ; Mots-cl¨¦s français / French Keywords Etude exp¨¦rimentale ; Oxydation ; R¨¦action ¨¦lectrochimique ; Recuit ; Spectrom¨¦trie photo¨¦lectron ; Rayon X ; Traitement surface ; Titane nitrure ; TiN ; N Ti ; Compos¨¦ min¨¦ral ; M¨¦tal transition compos¨¦ ; Mots-cl¨¦s espagnols / Spanish Keywords Reacci¨®n electroqu¨ªmica ; Localisation / Location INIST-CNRS, Cote INIST : 18260, 35400005181434.0120 |
2Â¥2010-01-02 09:40:24
hrzhou
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
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3Â¥2010-01-02 09:46:20
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4Â¥2010-01-02 09:58:49
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5Â¥2010-01-02 10:32:49













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