Abstract
Hydrothermal deposition of hydroxyapatite coatings on A₂O₃ substrates was studied using aqueous solutions of Ca(NO₃)₂ · 4H₂O and (NH₄)₂HPO₄ containing EDTA disodium salt as a chelating agent for Ca 2+ ions. For the precipitation of the coatings, the EDTA-Ca 2+ chelates were dissociated thermally at 200℃ or decomposed by oxidation with H₂O₂ at 90℃. Scanning electron microscopy and X-ray diffraction were used to investigate the deposition behavior and the phase of the coatings. Hydroxyapatite coatings were not deposited with the thermal dissociation method, whereas uniform deposition of the coatings (about 0.7 μm thickness) was obtained with the oxidative decomposition method. The coatings consisted of fine rod-like hydroxyapatite crystals (hexagonal structure) with 60 -80 nm diameters, having some preferred orientation with their length (i.e., the c axis) perpendicular to the substrate.
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