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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 58  1999
Synthesis and Sintering of Hydroxyapatite in Presence of Oxide Additives
R. RAMACHANDRA RAo AND T. S. KANNAN
Pages : 64-68
DOI : 10.1080/0371750X.1999.10799863
Abstract
Hydroxyapatite (HAP) has been synthesised in the presence of Al10 3 and Zr01 additives by solid state reaction between tricalcium phosphate (TCP) and Ca(OHh at 1000°C/8 h. The doping by Al10 3 and Zr01 resulted in the formation of CaAI10 4 and t-Zr01 as the secondary phases by partial consumption of CaO which in turn leads to the appearance of~-TCP along with HAP. The amount of HAP in the product is further reduced due to decomposition into ~-TCP and CaO when these powder products are pelletised and sintcred at 1300°C for 2 h. While in Al10 3 doped samples, CaO after reaction with Al10 3 and/or CaAI10 4 results in the formation of CaAI10 4 and/or CaAI40 7, in Zr01 doped samples t-Zr01 and CaZr03 are formed by solid-solution of CaO into Zr01. The products will have lower density as compared to pure HAP without additives owing to the differential shrinkage between the various phases present in the product.
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