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Surface characterization

Sittig, C. ; Textor, M. ; Spencer, N. ; Wieland, M. ; Vallotton, P.

In: Journal of Materials Science: Materials in Medicine, 1999, vol. 10, no. 1, p. 35-46

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    Titre
    • Surface characterization
    Auteur
    • Sittig, C.. Department of Materials, Laboratory for Surface Science and Technology, ETH Zürich, Sonneggstr. 5, CH-8092, Zürich, Switzerland
    • Textor, M.. Department of Materials, Laboratory for Surface Science and Technology, ETH Zürich, Sonneggstr. 5, CH-8092, Zürich, Switzerland
    • Spencer, N.. Department of Materials, Laboratory for Surface Science and Technology, ETH Zürich, Sonneggstr. 5, CH-8092, Zürich, Switzerland
    • Wieland, M.. Swiss Federal Laboratories for Materials Testing and Research, Überlandstr. 129, CH-8600, Dübendorf, Switzerland
    • Vallotton, P.. Institut Straumann AG, CH-4437, Waldenburg, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Journal of Materials Science: Materials in Medicine, 1999, vol. 10, no. 1, p. 35-46. Kluwer Academic Publishers
    Autre version électronique
    Classification
    • Santé
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320577
    Summary
    The biocompatibility of commercially pure titanium and its alloys is closely related to their surface properties, with both the composition of the protecting oxide film and the surface topography playing an important role. Surfaces of commercially pure titanium and of the two alloys Ti-6Al-7Nb and Ti-6Al-4V (wt %) have been investigated following three different pretreatments: polishing, nitric acid passivation and pickling in nitric acid-hydrogen fluoride. Nitric acid treatment is found to substantially reduce the concentration of surface contaminants present after polishing. The natural 4-6 nm thick oxide layer on commercially pure titanium is composed of titanium oxide in different oxidation states (TiO2, Ti2O3 and TiO), while for the alloys, aluminium and niobium or vanadium are additionally present in oxidized form (Al2O3, Nb2O5 or V-oxides). The concentrations of the alloying elements at the surface are shown to be strongly dependent on the pretreatment process. While pickling increases the surface roughness of both commercially pure titanium and the alloys, different mechanisms appear to be involved. In the case of commercially pure titanium, the dissolution rate depends on grain orientation, whereas in the case of the two alloys, selective α-phase dissolution and enrichment of the β-phase appears to occur. © 1999 Kluwer Academic Publishers