Modificação, caracterização de superfície de titânio CP tratado por plasma de H2 - N2 - O2 e avalição da biotividade da superfície tratada
Currently, the study of oxynitrided surfaces emerges as one of the most promising ways to obtain improvements in several properties of titanium and expand its applications. In this context, the plasma-assisted surface modification technique stands out due to its versatility, low impact on the enviro...
Sábháilte in:
| Príomhchruthaitheoir: | |
|---|---|
| Rannpháirtithe: | |
| Formáid: | doctoralThesis |
| Teanga: | pt_BR |
| Foilsithe / Cruthaithe: |
Universidade Federal do Rio Grande do Norte
|
| Ábhair: | |
| Rochtain ar líne: | https://repositorio.ufrn.br/handle/123456789/44635 |
| Clibeanna: |
Cuir clib leis
Níl clibeanna ann, Bí ar an gcéad duine le clib a chur leis an taifead seo!
|
| Achoimre: | Currently, the study of oxynitrided surfaces emerges as one of the most
promising ways to obtain improvements in several properties of titanium and
expand its applications. In this context, the plasma-assisted surface modification
technique stands out due to its versatility, low impact on the environment and for
being economically viable. Thus, samples were subjected to plasma treatment
for surface modification. Six study conditions were established for this doctoral
work, where thermochemical treatments were carried out in plasma
atmospheres containing mixtures of H2 – N2 – O2. Grazing X-ray diffraction
(GIDRX), X-ray induced photoelectron spectroscopy (XPS), Raman
spectroscopy and energy dispersive spectroscopy (EDS) were used for chemical
composition analyses. To assess the bioactivity, the samples were immersed in
a simulated body solution for 7 days. The surface energy and contact angle were
obtained by the sessile drop method. The results showed that the fluxes used in
the pretreatment and treatments were adequate to oxynitrite the titanium surface
in a predominantly diffusive process with about 6 µm thickness. In wettability,
there is a direct relationship between an increase in nitrogen flux in the working
atmosphere with an increase in the contact angle and a reduction in the polar
coordinate and surface tension of the treated surfaces. In the results referring to
hydroxyapatite nucleation, the highest degree of bioactivity is highlighted under
the experimental conditions of maximum oxygen flow and lower oxygen flow, in
intermediate conditions and absence of oxygen flow, a behavior equivalent to a
control sample is observed. |
|---|