Biomimetic Coatings on Ti-Based Alloys Obtained by Powder Metallurgy for Biomedical Applications
Comparing to hydroxyapatite (HA), which forms a strong chemical bond with the bony tissues, metallic materials are not able to bond with bone. For this reason, a great variety of complex coating methods, such as pulse-laser deposition, ion-beam assisted deposition and plasma-spray has been used to form a HA layer onto metallic surfaces. This study evaluated the performance of the biomimetic technique on apatite-based coating formation on two Tialloys. Ti-13Nb-13Zr and Ti-35Nb-7Zr-5Ta were obtained via powder metallurgy. The Tibased alloys were biomimetically coated using a technique which was modified from the conventional ones using a sodium silicate solution as the nucleant agent. Both alloys presented similar behavior in the evaluated conditions which means the formation of a homogeneous and well defined HA coating. These results show that these new non-toxic Tialloys seem to be very promising for biomedical applications.
Lucio Salgado and Francisco Ambrozio Filho
E.C.S. Rigo et al., "Biomimetic Coatings on Ti-Based Alloys Obtained by Powder Metallurgy for Biomedical Applications", Materials Science Forum, Vols. 530-531, pp. 599-604, 2006