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Title of Journal: J Mater Sci Mater Med

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Abbravation: Journal of Materials Science: Materials in Medicine

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Springer US

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DOI

10.1006/cimm.1996.0272

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1573-4838

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Preparation and characterization of biphasic calci

Authors: Z Z Zyman M V Tkachenko D V Polevodin
Publish Date: 2008/03/06
Volume: 19, Issue: 8, Pages: 2819-2825
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Abstract

A modified processing route for fabricating dense and porous biphasic calcium phosphate BCP ceramics of desired and reproducible phase composition hydroxyapatite HA/βtricalcium phosphate βTCP ratio has been developed The principal idea of the route was combining a precipitation and a solid phase methods First a nonstoichiometric slightly carbonated calciumdeficient HA CdHA precipitate was synthesized by mixing a calcium carbonate CaCO3 water suspension with an orthophosphoric acid H3PO4 solution in abundance related to the amount resulting in a stoichiometric HA under definite conditions and a powder of the precipitate was prepared and calcinated in air 860°C 15 h In the second stage a BCP ceramics of the composition determined by the calciumdeficiency in a calcinated powder the acid abundance in a mixture was processed by sintering powder compacts with or without a porosizer under appropriate conditions 1200°C 2h A calibrating dependence of the HA/βTCP ratio in the ceramics on the acid abundance has been plotted which enabled a controlled preparation of BCP ceramics A correlation based on unresolved bands in ν4PO 4 3− domain in IRspectra of nanostructured BCP materials was found Using the correlation the process of CdHA → βTCP transformation could be easily monitored The density and microhardness of the BCP ceramics neglectly depended on the composition however the compressive strength did the lower the HA/βTCP ratio the higher the strength in the dense materials

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