DESENVOLVIMENTO DE FILMES DE ÓXIDOS NANOESTRUTURADOS EM LIGAS BINÁRIAS DE NIÓBIO-TITÂNIO

• Autor(a) principal: Vieira, Fábio Bonorino
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional Universidade Franciscana
• Texto Completo: http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/544
• topic: Ligas de titânio, Estabilidade Eletroquímica, Corrosão, Filme Fino, Anodização, Citotoxicidade.; titanium alloys, chemical stability, corrosion, thin films, anodization, cytotoxicity.; Biociências e Nanomateriais

Due to their favorable properties as chemical stability, corrosion resistance, mechanical properties and biocompatibility, titanium and his alloys have been used for the manufacture of implants and prostheses for biomedical purposes. The stability of these metals and alloys is obtained due to a passivation layer of biocompatible titanium dioxide, naturally formed on the surface. In this work, titanium was anodized using potentiodynamic techniques forming a duplex with a film barrier back sheet type with a structure of type nanotubes on top. This film aims to metal passivation or alloy and enhance the characteristics of the material forward to interactions with the physiological environment. Although this oxide film is considered as a protective intermediate layer between the host tissue and the implant, it is considered the defense system a foreign body, and being very thin (only a few nanometers) and unstable under the action of body fluids. The current corrosion of metals and alloy with oxide coating in Ringer's solution increases towards Ti> Nb> Alloy 46.5% m / m Ti. The polished Nb shows high via cell viability and low genotoxicity. The anodized materials exhibit cytotoxicity and genotoxicity.