Si-TCP Synthesized from “Mg-free” Reagents Employed as Calcium Phosphate Cement

The influence of silicon doping on calcium phosphate cement were explored in this work. α-TCP and Si-α-TCP were prepared by solid state reaction employing “Mg-free” CaHPO 4 , CaCO 3 and CaSiO 3 as precursors. It was possible to obtain TCP powders with low contents of β phase as contaminant. Cement liquid phase was an aqueous solution containing 2.5 wt. (%) of Na 2 HPO 4 and 1.5 wt. (%) of citric acid. The liquid-to-powder ratio was 0.6 mL.g. Chemical, physical and mechanical properties of the cement samples were determined by means of XRD, FTIR, XRF, compressive strength and SEM. The calcium phosphate cements obtained achieved satisfactory properties; however, Si-α-TCP presented a decrease on the rate of setting reaction.