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


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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).



Key Engineering Materials (Volumes 330-332)

Main Theme:

Edited by:

Xingdong Zhang, Xudong Li, Hongsong Fan, Xuanyong Liu




Q. X. Zhu et al., "Effect of Ca/P Molar Ratio and Heat Treatment on Thermal Decomposition and Reconstitution of Hydroxyapatite", Key Engineering Materials, Vols. 330-332, pp. 107-110, 2007

Online since:

February 2007




[1] Kannan. S, Rocha.J. G, Ventura J.M. G: Scripta Materialia Vol. 53(2005), p.1259.

[2] Pauchiu E. Wang and T.K. Chaki. J. Mater. Sci: Mater. Med. Vol. 4(1993), p.150.

[3] B.C. Wang, E. Chang, T.M. Lee and C.Y. Yang: J Biomed Mater Res Vol. 29(1995), p.1483.

[4] C.F. Feng, K.A. Khor, E.J. Liu and P. Cheang: Scripta mater Vol. 42(2000), p.103.

[5] P. Frayssinet, F. Tourenne, N. Rouquet, P. Conte: J. Mater. Sci: Mater Med, Vol. 5(1994), p.11.

[6] J. Zhou, X. Zhang, J. Chen, S. Zeng, K. De Groot:J. Mater. Sci: Mater. Med Vol. 4 (1993), p.83.

[7] A. Krajewski, A. Ravaglioli: Bioceramics Vol. 5(1984), p.105.

[8] Chun-Jen Liao, Feng-Huei Lin, Ko-Shao Chen: Biomaterials Vol. 20(1999), p.1807.

[9] A. Rapacz-Kmita, A. S ´ lo´sarczyk, Z. Paszkiewicz.J. Mol. Struct, Vol. 704 (2004), p.333.

[10] Driessens, F. C. M.; Woltgens, J. H. M.: Bull. Soc. Chim. Belg Vol. 93(1984), p.161.

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