Um breve estudo da porosidade em ligas de titânio aplicado como biomaterial

Abstract

This work involves the study of porosity in titanium alloys for medical application. The objective of this work is to measure values ​​such as: total porosity, pore size distribution and interconnectivity, in order to relate them to the mechanical and biological properties of the implant. The first deals with the inclusion of pores in the structure to reduce the elastic modulus of the material, which leads to decreased wear and increase of its useful life; while the latter is related to prosthesis fixation, as the pores serve as anchor points for internal bone growth. Thus, a sample of Ti-6Al-4V alloy manufactured by direct laser metal sintering (DMLS) was analyzed. The technique of X-ray microtomography is presented as an important non-destructive analysis technique to identify the internal structure of the material. Through this, the porosity parameters of the sample were identified: porosity percentage, average pore size, pore size distribution. A three-dimensional sample model was also generated for better visualization of pore interconnectivity. The phases present in the sample were confirmed by X-ray diffraction. The microhardness and tensile mechanical tests were performed, together with the fractographic analysis of the tensile tested sample.