Produção de estrutura com gradiente de porosidade a partir da sinterização por plasma da mistura de pós Ti-Nb-Sn
Porous structures are being widely investigated for use in biomedical implants, aiming to mechanically integrate and functionally the implant inside the bone tissue. Moreover, this structure is also important for drugs that can be stored and can induce and accelerate the process of osseointegrati...
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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/123456789/19426 |
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| Resumo: | Porous structures are being widely investigated for use in biomedical implants, aiming to
mechanically integrate and functionally the implant inside the bone tissue. Moreover, this
structure is also important for drugs that can be stored and can induce and accelerate the
process of osseointegration. With the purpose to investigate this effect, Ti, Nb and Sn
metal powders, were sintered by plasma using a hollow cathode discharge. Sintering was
performed in argon plasma set at 4 mbar pressure and temperatures of 500 ° C, 600 ° C and
700 ° C. Samples were also sintered in the electrical resistance furnace at 1200 ° C in order
to compare plasma sintering with the conventional method. It was observed that plasma
samples sintered with the hollow cathode configuration showed a gradient in porosity,
while the samples sintered in the resistive furnace did not. Furthermore, differences in the
microstructure of the samples were found, were a surface with higher porosity and ales
porous core were obtained at different temperatures. The percolation profile of distilled
water and the chemical compositions of the porous layers of the plasma treated samples
were the main results obtained. Based on these results, we can conclude that this structure
is particularly important for application in the biomedical field such as scaffolds for drug
delivery and implants |
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