Desenvolvimento de uma nova liga quaternária Ti25Ta25Nb4Sn para aplicações biomédicas

• Autor(a) principal: Marucci, Renan
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/215704
• topic: Biomaterials; Titanium alloys; Quaternary alloys; Biomedical applcations; Biomateriais; Ligas de titânio; Ligas quaternárias; Aplicações biomédicas; Materiais biomédicos; Sistemas biológicos

The increasing use of biomaterials in biological systems such as body environment has required studies to develop new materials that when used in specific functions, efficiently satisfy what they have been designated for, prostheses and dental implants. The use of titanium and its alloys grew exponentially because of this excellent properties such as high corrosion resistance, biocompatibility and low elasticity modulus. However, these materials can be corroded when exposed to body fluids. The release of metal ions can produce some toxicity, like NiTi and Ti6Al4V alloys. In this study, a new quaternary alloy with noncytotoxic elements Ti, Ta, Nb and Sn was processed and evaluated. The casting process of the metals was obtained an arc melting furnace with inert atmosphere (argon). The obtained ingots were submitted to an homogenization heat treatment (950 °C for 24 hours with slow cooling inside the furnace) and then cold forged in a rotary forge with subsequent solubilization and stabilization heat treatment. At each stage of the process, a sample was taken for microstructural analyses (optical microscopy and x-rays diffraction) and mechanical characterization of microhardness and corrosion resistance (open circuit potential and potentiodynamic polarization). The samples showed predominance of the β phase in this microstructure, microhardness of 184 HV, and a higher corrosion resistance than Ti CP and similar to the quaternary alloy Ti25Ta25Nb3Sn. Therefore, the Quaternary alloy Ti25Ta25Nb4Sn presented satisfactory results for biomedical applications