Abstract

• This research has been embarked to prepare hydroxyapatite by co-precipitation method to provide an accurate understanding of the behavior of biphasic biomaterials with HAP and β-TCP. Raw materials of calcium sulphate dihydrate (CaSO4.2H2O, or Gypsum) and di-ammonium hydrogen phosphate ((NH4)2HPO4) solution have been used as the starting materials to synthesize high purity hydroxyapatite in the first step. The effect of reaction temperature on conversion efficiencies of gypsum to HAP and reaction kinetics has been reported in the previous work. At heat-treatment of 1100℃, HAP has converted partially into beta-tricalcium phosphate (β-TCP, Ca3(PO4)2). The phase formations of these samples have been confirmed by using X-ray Diffraction (XRD) technique. Surface morphology and particle size of HAP and HAP/β-TCP samples have been studied by Scanning Electron Microscope (SEM). The effect of the reaction temperature on the morphology of biomaterials has been investigated. The thermal stability studies of the co-precipitated dry powder have been conducted by using Thermo-gravimetric and Differential Thermal analysis (TG/DTA).