Tribocorrosion behaviour of composite and bio-functionalized porous surfaces for biomedical implant applications

Referencia Apresentador Autores
Fatih Toptan Toptan, F.(Universidade do Minho); Some major clinical concerns are still valid on biomedical implants, such as bone resorption due to stress shielding, lack of bioactivity, and low tribocorrosion resistance leading to the intense release of metallic ions together with wear debris. From these clinical concerns, stress shielding can be overcome by using porous metallic structures; lack of bioactivity can be overcome by surface bio-functionalization or by incorporating bioactive elements, and finally, low tribocorrosion resistance can be overcome by using surface treatments or by incorporating micro/nano hard ceramic phases. This presentation will make an overview on the tribocorrosion behaviour of metal-matrix bio-composites (bio-MMCs), and bio-functionalized porous metallic structures tested under simulated body environments. Results showed that bio-MMCs and bio-functionalized porous metallic structures exhibited better tribocorrosion behaviour mainly due to the load carrying effect given by the hard reinforcement phases, or hard oxide surfaces formed by anodic treatment. Consequently, lower tendency to corrosion and/or lower corrosion rate recorded under sliding, usually resulting in less material degradation under tribocorrosion action.
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