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  4. Investigation of surface pre-treatments for the structural bonding of titanium
 
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2012
Journal Article
Title

Investigation of surface pre-treatments for the structural bonding of titanium

Abstract
This paper evaluates wet-chemical pre-treatments (alkaline etching, anodising) and a plasma treatment for structural bonding of titanium (Ti 6Al 4V). The main objective of this study is the comparison of the applicability of the plasma pre-treatment to wet-chemical treatments on titanium for structural bonding. In this context, an atmospheric pressure plasma device was used to deposit thin functional films from hexamethyldisiloxane (HMDSO) precursor on titanium. X-ray photoelectron spectroscopy (XPS) was employed to assess the chemical composition of the surface after different pre-treatments on the titanium substrate, while the morphology and the film thickness were investigated with scanning electron microscopy (SEM). The adhesion properties on titanium were evaluated by means of a wedge test in hot/wet conditions. After bonding tests the fracture surface and the failure loci were analysed. Using a long arc plasma generator and HMDSO precursor almost stoichiometric SiO 2 coatings were obtained on the titanium substrate. These coatings exhibit good long-term durability and bond strength compared to an alkaline etching in the wedge test. The investigated anodising process leads to oxide layers revealing a highly porous nanostructure. In contrast to the alkaline etching, the plasma derived coatings and the oxide layer produced by the anodising process exhibit a higher micro, respectively nano roughness, and hence a better long-term durability.
Author(s)
Mertens, T.
Gammel, F.J.
Kolb, M.
Rohr, O.
Kotte, L.
Tschöcke, S.
Kaskel, S.
Krupp, U.
Journal
International journal of adhesion and adhesives  
DOI
10.1016/j.ijadhadh.2011.12.007
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • atmospheric pressure plasma

  • surface treatment

  • titanium and alloys

  • wedge test

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