48.  Preparation of β-Tricalcium Phosphate from Precursors Obtained by a Wet Precipitation Method

Authors: M. Stoia, M. Ionescu, O. Stefanescu, R. Murgan, M. Stefanescu


Abstract:

Calcium phosphate ceramics are widely used as bone replacements in the field of oral and plastic surgery. Among these, hydroxyapatite and β-tricalcium phosphate favor bone reconstruction, due to high properties of resorbability for β-Ca3(PO4)2 and good osteoconductivity for hydroxyapatite. In this paper we present the preparation of β-tricalcium phosphate Ca3(PO4)2 by thermal treatment of a calcium deficient hydroxyapatite. The hydroxyapatite was prepared by wet precipitation of Ca(II) with (NH4)2HPO4, starting from two calcium salts: calcium nitrate Ca(NO3)2 and calcium acetate Ca(CH3COO)2. The precipitation reaction products were characterized by FT-IR spectrometry, XRD analysis and thermal analysis. These techniques confirmed the formation of the calcium deficient hydroxyapatite, for both Ca(II) precursors. The products of the hydroxyapatites annealed at 800C and 1000C contained β-Ca3(PO4)2 as single crystalline phase.


Keywords: tricalcium phosphate, apatite, precipitation, RX

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