Effect of niobium´s content and the cooling rate on the microstructure and corrosion resistance of the Ti-Nb / Efeito do teor de niobio e da taxa de resfriamento sobre a microestrutura e resistencia a corrosão de ligas Ti-Nb

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Pure titanium is used commercially as biomaterial in the manufacture of odontologic and orthopedic prosthesis, due to its high biocompatibility and good corrosion resistance. The use of the pure titanium shows deficiency in mechanical proprieties because the mechanics requests are high. When the mechanic s requests are high, like in the hip s total implant, the use of titanium is given through metallic alloys. Among these alloys, the beta -alloys is the most promising because of their high mechanics resistance, good corrosion resistance and excellent biocompatibility. The titanium beta -alloys are obtained from addition of alloying elements like Nb, Zr and Ta. Through adequate heat treatments, these alloys can generate different microstructures, which show excellent mechanics proprieties and good corrosion resistance. The objective of this project is observed the influence of the niobium s content in the Ti-20Nb, Ti-25Nb and Ti-35Nb alloys and the variation of microstructure through the different cooling rates over corrosion process in the environment that simulates the corporal fluid. The techniques of Electrochemical Impedance Spectroscopy and Electrochemical Polarization are used as analysis tools. From the gotten results it was possible to select samples with element contents of alloys and cooling rates that resulted in a set of electrochemical proprieties more suitable to use in orthopedic prosthesis

ASSUNTO(S)

biomaterial titanium alloys corrosão ligas de titanio - resfriamento microestrutura corrosion microstructure cooling rate biomateriais ligas de titanio

ACESSO AO ARTIGO

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