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Effect of Ca/P Molar Ratio and Heat Treatment on Thermal Decomposition and Reconstitution of Hydroxyapatite

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Abstract:

Stability of hydroxyapatite(HA) structure is influenced by preparation conditions and afterwards heat treatment. In this paper, the powders with different Ca/P molar ratio were calcined to investigate the influence of Ca/P and heat treatment on thermal decomposition and reconstitution of HA. The results show that the Ca/P has little change even calcined at a high temperature of 1500°C. The Ca/P molar ratio close to 1.67 is beneficial to form high purity HA. HA gradually releases its OH- ions in the temperature range of 800-1200°C. The decomposition takes place at about 1200°C and will become more and more severe with the increase of temperature. Cooling with slow rate and post-heat treatment in wet atmosphere are beneficial to both the rehydration and the recovery of HA from the decomposition products (TTCP and α-TCP).

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Periodical:

Key Engineering Materials (Volumes 330-332)

Pages:

107-110

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.330-332.107

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Online since:

February 2007

Authors:

Qing Xia Zhu, Ming Lv, Jian Qing Wu

Keywords:

Ca/P Molar Ratio, Decomposition, Dehydroxylation, Hydroxyapatite (HAP), Post-Heat Treatment

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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