SYNTHESS AND CHARACTERIZATION OF HYDROXYAPATTE/ALUMNA COMPOSTENANOPOWDERS WITH VARIOUS ALUMNA CONTENT

Preparation of hydroxyapatite - based nanocomposites and the use of o-Al2O3 particles as reinforcing phase, including ways to improve the mechanical properties of apatite bioceramics. In this study, hydroxyapatite falumina composite nanopowders with alumina content of 10,20 and 30% wt was synthesized via colloidal sol - gel method. Structural evolution during the synthesis of HAp/Al2O3 composite nanopowders is investigated by using simultaneous thermal analysis (STA), X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The microstructural and morphology were studied using scanning electron microscopy (SEM) . This study showed the successful formation of HAp phase after a low temperature calcination proccess at 300 °C. Increasing Al2O3 content has no effect on decomposition rate of HAp in to beta tri-calcium phosphate (B-TCP) and presence of Al2O3 particles among hydroxyapatite particles resulted in grain growth inhibition of HA particles.