Electrophoretic Deposition of Hycfroxyapatite and 58S Bioactive Glass coatings on the Ti6AI4V alloy subjected to Surface Mechanical Attrition Treatment

摘要

Hydroxyapatite (HAP) and 58S Bioactive Glasses (BG) coatings were successfully synthesized by Electrophoretic Deposition (EPD) on Ti6Al4V alloy subjected to Surface Mechanical Attrition Treatment (SMAT). This process uses steel balls impacts on the Ti6Al4V surface to improve its mechanical properties. However when the Ti6Al4V substrate is treated by SMAT the industrial plasma spray technique is not efficient to obtain adherent HAP coatings. This problem is mainly related to the modifications of the Ti6Al4V surface topography due to the SMAT process. Therefore, in this work we demonstrate that EPD offers an efficient solution to solve this technical problem. Indeed we obtained homogeneous and adherent HAP coatings on the SMATed Ti6Al4V sample surface from a suspension of HAP nano particles in ethanol. Moreover EPD is also successfully employed to produce a 58S BG coating on the SMATed Ti6A14V samples. Scanning Electron Microscopy (SEM) associated to Energy Dispersive X-Ray Spectroscopy (EDXS) reveals that the coatings obtained by EPD are adherent and compact without alteration of their chemical composition.