Characterization of sintered titanium/hydroxyapatite biocomposite using FTIR spectroscopy
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Fourier transform infrared (FTIR) spectroscopy was employed to characterize the phase changes of hydroxyapatite (Ca10(PO4)6(OH)2, HA) in a titanium/HA biocomposite during sintering. The effects of sintering temperature and the presence of Ti on the decomposition of HA were examined. It was observed that pure HA was stable in argon atmosphere at temperatures up to 1,200°C, although the dehydroxylation of pure HA was promoted by the increase in sintering temperature. In the Ti/HA system, on the other hand, the presence of Ti accelerated dehydroxylation and the decomposition of HA was detected at a temperature as low as 800°C. Tetracalcium phosphate (Ca4P2O9, TTCP) and calcium oxide (CaO) were the dominant products of the decomposition, but no tricalcium phosphate (Ca3(PO4)2, TCP) was detected due to phosphorus diffusion and possible reactions during the thermal process. The main decomposed constituents of HA in Ti/HA system at high temperatures (≥1,200°C) would be CaO and amorphous phases.
KeywordsSinter Temperature Calcium Phosphate Water Vapour Pressure Tricalcium Phosphate TTCP
This work is supported by the Natural Science and Engineering Research Council of Canada. The valuable discussions and help from Prof. P.J Ragogna, Mr. Jason L. Dutton and Mr. Caleb Martin of the University of Western Ontario related to this research work are gratefully acknowledged.
- 3.U. Ripamonti, J. Bone Joint Surg. 73A, 692 (1991)Google Scholar
- 6.L.L. Hench, J. Am. Ceram. Soc. 81, 1705 (1998)Google Scholar
- 7.H. Aoki, Science and Medical Applications of Hydroxyapatite (Takayama, Tokyo, 1991), p. 137Google Scholar
- 11.Y.C. Fung, Biomechanics: Mechanical Properties of Living tissues (Springer-Verlag, New York, 1993), p. 510Google Scholar
- 14.A. Biship, C.Y. Lin, M. Navaratnam, R.D. Rawlings, H.B. Mcshane, J. Mater. Sci. Lett. 12, 1516 (1993)Google Scholar
- 33.R.A. Nyquist, R.O. Rageli, Handbook of Infrared and Raman Spectra of Inorganic Compounds and Organic Salts. Vol.4: Infrared Spectra of Inorganic Compounds (3800–45 cm − 1) (Academic, San Diego, 1997), p. 207Google Scholar
- 36.M.K. Gergs, H.A. Said, M. Donogol, H.A. Aly, Int. J. Mater. Sci. 2, 81 (2007)Google Scholar