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@InProceedings{SilvaUedaOtanMell:2009:ImSuPr,
               author = "Silva, G. and Ueda, M{\'a}rio and Otani, C. and Mello, Carina 
                         Barros",
          affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Improvement of the Surface Properties of Titanium by Plasma Based 
                         Ion Implantation in High Temperatures",
                 year = "2009",
         organization = "International Workshop on Plasma-Based Ion Implantation and 
                         Deposition, 10. (PPI\&D).",
             abstract = "The Ti6Al4V is a titanium alloy that has many applications in 
                         aerospace industry due to its good mechanical and corrosion 
                         properties. But its poor tribological characteristics can restrict 
                         the use of this material. To modify this and other surface 
                         properties, experiments of nitrogen PBII were performed. Here, one 
                         system of auxiliary heating was used to reach the required high 
                         temperatures, between 680 and 760 C, during the treatments. The 
                         samples were treated using nitrogen PBII at 5 keV, with 40 
                         {\`{\i}}s pulse length, and 400 Hz repetition rate during one, 
                         two and four hours. The high temperature employed, improves the 
                         nitrogen diffusion into the titanium alloy surface. As a 
                         consequence the modified thickness can increase substantially. 
                         After nitrogen PBII experiments, the Ti6Al4V alloy surface 
                         properties were evaluated by potentiodynamic polarization, 
                         electrochemical impedance spectroscopy and pin-on-disc tests. The 
                         morphology of the surface after corrosion tests was obtained by 
                         SEM. For characterization of the Ti6Al4V X-ray diffraction was 
                         performed while Auger spectroscopy is underway. After PBII 
                         treatments, it was verified that the Ti6Al4V presents a new 
                         behaviour, for instance, it showed a better performance in the 
                         salt corrosion tests. This more noble behavior is due the 
                         reduction of the values of passive current densities, about one 
                         order of magnitude. Besides this, the tribological properties 
                         improved too, as was observed on pin-ondisc tests. The friction 
                         coefficient decreased in the initial stages of the wear tests. To 
                         evaluate the mechanical properties as hardness and Young modulus, 
                         nanoindentation tests will be made on samples before and after 
                         nitrogen PBII with auxiliary heating.",
  conference-location = "S{\~a}o Jos{\'e} dos Campos, SP",
      conference-year = "7-11 Sept.",
        urlaccessdate = "31 out. 2020"
}


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