Comparação entre técnicas de nitretação em cátodo oco e gaiola catódica na deposição de TiN
The plasma nitriding has been used in industrial and technological applications for large-scale show an improvement in the mechanical, tribological, among others. In order to solve problems arising in the conventional nitriding, for example, rings constraint (edge effect) techniques have been dev...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19663 |
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| Resumo: | The plasma nitriding has been used in industrial and technological applications
for large-scale show an improvement in the mechanical, tribological, among others. In
order to solve problems arising in the conventional nitriding, for example, rings
constraint (edge effect) techniques have been developed with different cathodes. In this
work, we studied surfaces of commercially pure titanium (Grade II), modified by
plasma nitriding treatment through different settings cathodes (hollow cathode, cathodic
cage with a cage and cathodic cage with two cages) varying the temperature 350, 400
and 430oC, with the goal of obtaining a surface optimization for technological
applications, evaluating which treatment generally showed better results under the
substrate. The samples were characterized by the techniques of testing for Atomic Force
Microscopy (AFM), Raman spectroscopy, microhardness, X-ray diffraction (XRD), and
a macroscopic analysis. Thus, we were able to evaluate the processing properties, such
as roughness, topography, the presence of interstitial elements, hardness, homogeneity,
uniformity and thickness of the nitrided layer. It was observed that all samples were
exposed to nitriding modified relative to the control sample (no treatment) thus having
increased surface hardness, the presence of TiN observed by XRD as per both Raman
and a significant change in the roughness of the treated samples . It was found that
treatment in hollow cathode, despite having the lowest value of microhardness between
treated samples, was presented the lowest surface roughness, although this
configuration samples suffer greater physical aggressiveness of treatment |
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