Processamento, caracterização microestrutural e propriedades elásticas de metais celulares do sistema Ti-6Al-4V para fins de regeneração óssea

• Ano de defesa: 2014
• Autor(a) principal: Ruiz, Samira Lea Medina [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Materiais biomédicos; Produtos industrializados; Metais; Aparelhos ortopédicos; Biomedical materials
• Link de acesso: http://hdl.handle.net/11449/110886

The growing demand for biomaterials has required of science great advances in the development of techniques that generate better quality of life for people in need of implants. In the case celular metals of titanium are an alternative for reducing the modulus of elasticity, approaching its rigidity to the bone tissue, as it provides a combination of low density, high rigidity and high energy absorption capacity. In this work made celular made cellular structures of Ti-6Al-4V alloy, processed by direct metal laser sitering (DMLS), which is an additive manufacturing techique that reproduces layer-to-layer 3D virtual prototypes in order to form the desired object, which makes use of laser energy to sintering powder particles of Ti-6Al-4V alloy. For construction of virtual models it was used the SolidWorks 3D CAD Desing software, with a group of sampls with square geometry pores, with size of 500, 650 and 750 um, and thickness cell walls always half the size of the pores, for obtaining porosity close to 60%. The samples were submited to heat treatment at 800ºC and slow cooling, being characterized by scanning electron microscopy (SEM), computed tomography, relative density, hardness and modulus of elasticity (stiffness). Both the alloy powder and sintered samples presented high roughness due to the presence of non-sintered powder particles. The SEM images presented differences between pore size and cell wall thickness. The images of computed tomography show micro failure on the cell walls. The experimental porosity values differ from the theoretical values, on average, 27% and relative density values above 0.30 were obtained for all samples. The hardness values for all cellular metals are superior to commercial alloy. The values of modulus of elasticity (siffness) suffered significant reductions (when compared with commercial alloy), with values varying between 9 and 22 GPa. According to results, the additive manufacturing showed effective...