Abstract
The effect of heat treatment on the calcium phosphate deposited on Ti-6Al-4V substrate using an electrolytic process is investigated. The calcium phosphate was deposited in a 0.04 M Ca(H2PO4)2·H2O (MCPM) solution on a Ti-6Al-4V substrate at 333 K (60 °C), 10 V, and 80 Torr for 1 hour, and calcined at various temperatures for 4 hours. The X-ray diffraction (XRD) results demonstrate that the phases are dicalcium phosphate (CaHPO4, DCPD) and hydroxyapatile [Ca(PO4)6 (OH)2, HAP] for the as-deposited samples. When the deposited sample was calcined at 873 K (600 °C) for 4 hours, the XRD results show that the transformation of DCPD to HAP occurs. Moreover, HAP converts to β-TCP, CPP, and CaO. For the sample calcined at 1073 K (800 °C) for 4 hours, the scanning electron microscopy (SEM) micrograph reveals that the crack of the calcined sample propagates with a width of about 3 μm. This result is due to HAP becoming decomposed and converting to β-TCP, CPP, CaO, and H2O. The vaporization of H2O within the calcined sample promotes the crack propagation and growth.
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Acknowledgments
The authors acknowledge the financial support provided by the National Science Council Taiwan, Republic of China (Contact No. NSC93-2216-E-151-005). We also thank Mr. H.Y. Yao for TEM/EDS experiments, Mr. F.C. Wu for SEM photography, and Professor M.P. Hung for suggestions on the manuscript preparation.
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Manuscript submitted July 8, 2009.
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Shih, WJ., Wang, MC., Chang, KM. et al. Phase Transformation of Calcium Phosphates by Electrodeposition and Heat Treatment. Metall Mater Trans A 41, 3509–3516 (2010). https://doi.org/10.1007/s11661-010-0417-x
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DOI: https://doi.org/10.1007/s11661-010-0417-x