**4. Conclusion**

Tricalcium phosphate and fluorapatite powder were mixed in order to elaborate biphasic composites. The influence of Fap substitution on the β-TCP matrix was detected in the mechanical properties of the sintered composites. The characterization of samples was investigated by using X-Ray diffraction, differential thermal analysis, scanning electronic microscopy and by an analysis using 31P nuclear magnetic resonance. The sintering of tricalcium phosphate with different percentages of fluorapatite indicates the evolution of the microstructure, densification and mechanical properties. The Brazilian test was used to measure the rupture strength of biphasic composites biomaterials. The mechanical properties increase with the sintered temperature and with fluorapatite additive. The mechanical resistance of β tricalcium phosphate - 33.16 wt % fluorapatite composites reached its maximum value (13.7MPa) at 1400°C, whereas the optimum densification was obtained at 1350°C (93.2%). Above 1400°C, the densification and mechanical properties were hindered by the tricalcium phosphate allotropic transformation and the formation of both intragranular porosity and cracks.
