Deposition of Nano-Crystalline Fluor-hydroxyapatite Coatings on Titanium Substrates via Sol-Gel Method

In this investigation, fluor-hydroxyapatite (fha) film was deposited on atitanium substrate by sol-gel method. triethyl phosphite, ammonium fluoride andcalcium nitrate in ethanol solutions were used respectively as p,f and ca precursors.typical apatite structures were obtained for all coatings after dipping and subsequentheat treatment at 550, 700 and 800°c, the coating layers were investigated with xraydiffraction , fourier transform infra-red and scanning electron microscopyspectroscopy. based on the results obtained from x-ray diffraction, the coatings heatedat 550 °c were composed of hydroxyapatite (ha) and fluorapatite (fa). rutile (ti02)phase was also found in the coatings heated at higher temperature. in addition, theformation of fluor-hydroxyapatite was confirmed by ft-ir results. sem studiesshowed the samples heat treated at 550°c and 700 °c have almost the samemorphology. it seems the coating of samples heat treated in 800°c was morehomogenous and smooth without any considerable porosity.