Preparation and characterization of hydroxyapatite coatings on Ti6Al4V alloy by a sol-gel method

Hydroxyapatite coatings on Ti6Al4V substrates were prepared by a sol-gel me thod, and characterized by X-ray diffraction, scanning electron microscopy, and infrared reflection spectroscopy. The coatings obtained at 500 degrees C in air had a hydroxyapatite phase, some of which was carbonated hydroxya patite, and had a dense and smooth morphology, When the coatings were treat ed in a simulated body fluid, the coatings had an increase in large hydroxy apatite grains, and a rough and porous morphology. The adhesive strength of the coatings was more than 14 MPa.