The Influence of Oxidized Interlayer on the Adhesion of Bioactive Cao-P2o5-Tio2-Na2o Glass Ceramic Coating to the Titanium Substrate

Titanium alloys are important bio materials which may also need to a bio compatible coating. To improve the Ti/glass-ceramic bonding is a challenging part of coating because the bonding properties play an important role in the long-term performance of medical implants.  The purpose of this research is to improve the bonding strength of bioactive coating in the system of CaO-P2O5-Na2O-TiO2 using the formation of suitable oxidized layer and studying the effect of this interlayer on adhesion of coating. To achieve this goal, after surface modification, the surface of titanium samples was heat treated in 750 ˚c for 30, 60 and 90 min, to be oxidized. The results of Scanning Electron Microscopy (SEM) and Elemental concentration analysis by EDS and Atomic Force Microscopy (AFM) show that oxidized layer that was produced in 750˚c and 30 min. This oxidized interlayer has the best properties in comparison with two other samples and has the best adhesion to both substrate and coating.

Keywords:

Titanium Alloys , Bioactive Coating , Oxidation , heat treatment , Bonding Strength