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Materials Research

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MOTISUKE, Mariana; CARRODEGUAS, Raul García  and  ZAVAGLIA, Cecília Amélia de Carvalho. Si-TCP synthesized from "Mg-free" reagents employed as calcium phosphate cement. Mat. Res. [online]. 2012, vol.15, n.4, pp.568-572.  Epub July 31, 2012. ISSN 1516-1439.

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" CaHPO4, CaCO3 and CaSiO3 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 Na2HPO4 and 1.5 wt. (%) of citric acid. The liquid-to-powder ratio was 0.6 mL.g-1. 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.

Keywords : calcium phosphate cements; Si-doped calcium phosphates; bioceramics.

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