Ligas do sistema Sn-Zn obtidas por solidificação rápida

Abstract

The increase in the number of implants and medical interventions that make use of biomaterials has been growing in parallel with the increase in life expectancy of the population. Thus, as related research to the development of biomaterials and their applications has taken on a large scale. The use of alloys that describe mechanical properties, such as modulus of elasticity and mechanical strength, similar to human bones are becoming more and recurrent. In this work, the tin alloys, the Sn-Zn system, and a fast melt spinning cooling technique were used conform ribbons to analyze their behavior against the simulated conditions in the body environment, through simulated body solution (SBF), in temperature and pH similar to the blood plasma. The microstructural characterization showed that there was a refinement in the microstructure of the ribbons compared to the conventional cooling method. The differential scanning calorimetry analysis shows that there was a decrease in the liquidus temperature of the ribbons, showing the influence of the fast cooling over the ribbons. The increasing of zinc concentration increases the microhardness of the ribbons. The polycaprolactone (PCL) coating was done to verify the adhesion over the metallic substrate, assisting in the biocompatibility properties, moreover the drug control release. In addition, silver nanoparticles (NPAg) were incorporated over the PCL, to act as an antimicrobial agent. Through the corrosion tests, was observed that the increase of zinc concentration, decrease the corrosion resistance in 1.5 SBF environment. The PCL 1% coating does not interfere in the electrochemical parameters and the NPAg presence, promote higher corrosion activity in the material. The bioactivity tests showed the apatites formation over all the ribbons surfaces studied (Sn, S1Zn, Sn3Zn, without coating, with coating PCL 1%, and with PCL 1% coating and NPAg incorporation). The antimicrobial tests did not showed any formation of inhibition halos.