Phase Transformation of Calcium Phosphates by Electrodeposition and Heat Treatment |
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| Authors: | Wei-Jen Shih Moo-Chin Wang Kuo-Ming Chang Cheng-Li Wang Szu-Hao Wang Wang-Long Li Hong-Hsin Huang |
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| Affiliation: | (1) Metal Industries Research and Development Center, Kaohsiung, 81160, Taiwan R.O.C.;(2) Head of Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung, 80782, Taiwan R.O.C.;(3) Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 80782, Taiwan R.O.C.;(4) Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan, 70101, Taiwan R.O.C.;(5) Department of Electrical Engineering, Cheng Shiu University, Niaosong, Kaohsiung, 83347, Taiwan R.O.C.; |
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| 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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