Fabrication and characterization of multifunctional materials by powder metallurgy for biomedical applications

Multifunctional materials are of interest for biomedical applications due to the different features they exhibit to improve osseointegration of bone implants. Therefore, this work focuses on the fabrication of a three-layer component by powder metallurgy. Samples are composed of one dense layer, another porous and a composite layer using Ti6Al4V alloy powders as matrix. Fabrication consists in axial pressing and then sintering at 1260 ℃. Microstructure was determined by SEM and computed microtomography. Mechanical properties were evaluated by compression tests. Results showed that the densification of three-layer samples was constrained by the layer with lower densification. In spite of that, no defects were developed during sintering. Microstructure obtained shows different characteristics with good bonding between layers. Remaining porosity is interconnected throughout the layers. Mechanical strength is low, close to the range of compact human bones. In conclusion, powder metallurgy is a good alternative route to process and design multifunctional materials.