Author/Authors :
Minouei، H. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran. , , Fathi، M. H. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran Fathi, M. H. , Meratin، M. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran. , , Ghazvinizadeh، H. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran. ,
Abstract :
ASTM F-75 Cobalt-base alloy castings are widely used for manufacturing orthopedic implants. The alloy
needs both homogenization and solutionizing heat treatment after casting, as well as bioactivation of the surface to
increase the ability of tissue bonding. In this study, ASTM F-75 Cobalt-base substrate was heat treated at 1220°C for
1 hour in contact with Hydroxyapatite-Bioglass powder in order to solutionize and homogenize the microstructure and
promote surface bioactivation. In order to bioactivity evaluation, heat treated specimens were immersed in Simulated
Body Fluid (SBF). Surface of specimens before and after the immersion was analyzed by Scanning Electron
Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and X-Ray Diffraction (XRD). Results showed an
appropriate microstructure with bioactive layer on the surface of specimens after heat treatment. In vitro evaluation
results and formation of bone-like apatite layer on specimens indicated that heat treated samples were potentially
suitable for medical orthopedic applications under highly loaded conditions.
