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Previous issue date: 2014-06-20 / Estruturas porosas est?o sendo amplamente investigadas para uso em implantes biom?dicos, com objetivo de integrar o implante de forma mec?nica e funcional no interior do tecido ?sseo. Al?m disso, esta estrutura tamb?m ? importante para que f?rmacos possam se armazenados podendo induzir e acelerar o processo de osseointegra??o. Com o intuito de investigar esse efeito, p?s met?licos de Ti, 35Nb e 4Sn foram sinterizados por plasma usando descarga por c?todo oco. As sinteriza??es foram realizadas em plasma de arg?nio, press?o fixada em 4 mbar e temperaturas de 500?C, 600?C e 700?C. Tamb?m foram sinterizadas amostras em forno ? resit?ncia el?trica ? 1200?C, afim de comparar a sinteriza??o a plasma com um met?do convencional. Verificou-se que amostras sinterizadas por plasma na configura??o de c?todo oco apresentaram gradiente de porosidade, enquanto as amostras sinterizadas em forno resistivo n?o apresentaram. Al?m disso, encontrou-se diferen?as na micro-estrutura onde obteve-se uma superfic?e mais porosa e o n?cleo mais denso, em diferentes temperaturas. Assim como per?l de percola??o de ?gua destilada, e a compara??o da composi??o qu?mica das camadas porosas das amostras tratadas por plasma foram os pricipais resultados obtidos. Diante dos resultados obtidos, pode-se concluir que essa estrutura ? particularmente importante para aplica??o na ?rea biom?dica tais como arcabou?os para libera??o de f?rmacos e implantes.
. / 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
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19426 |
| Date | 20 June 2014 |
| Creators | Silva, Hugo Fernandes Medeiros da |
| Contributors | 09621199468, http://lattes.cnpq.br/7441669258580942, Barbosa, Ana Paula Cysne, 04561659676, http://lattes.cnpq.br/3718650566004689, Soares, Gloria Dulce de Almeida, 24481203749, http://lattes.cnpq.br/5270449921166938, Alves J?nior, Clodomiro |
| Publisher | Universidade Federal do Rio Grande do Norte, P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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