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Hydroxyapatite (HA) coatings were deposited on titanium substrates by electrophoretic deposition (EPD) at constant voltage and dynamic voltage, respectively. Various surface morphologies were observed under different type of voltages. Under a constant voltage of 20 V, a dense HA coating could be prepared. Under a constant voltage of 200 V, big HA particles were deposited and the coating was porous. Under a dynamic voltage, a continuous gradient HA coating could be obtained. HA coatings were characterized with a field emission-scanning electron microscopy (FE-SEM) and an X-ray diffraction (XRD). XRD indicated no significant HA decomposition when the coatings were sintered for 2 h at 800 degrees C.
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Meng et al. (2005) studied this question.
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