Hydrothermal-Electrochemical Deposition of Calcium Phosphates on Various Metals

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Calcium phosphates were formed on five kinds of substrate metals using a hydrothermal-electrochemical method in an autoclave with two electrodes. The electrolyte dissolving NaCl, K_2HPO_4, CaCl_2・2H_2O, tris (hydroxymethyl) aminomethane, and hydrochloric acid was maintained at 100℃, 150℃ and 200℃. The counter electrode, the anode, was platinum plate, 20×20×0.5 mm, and the working electrodes as cathode were pure titanium, pure zinc, pure nickel, pure iron, and stainless steel plates. A constant direct current at 12.5 mA/cm^2 was loaded for 1 hr. Hydroxyapatite [Ca_<10>(PO_4)_6(OH)_2] only deposited at three temperatures on pure titanium plate. On pure zinc plate, both parascholzite [CaZn_2(PO_4)_2・2H_2O] and hydroxyapatite were formed at l5O℃ and both parascholzite and ZnO were formed at 200℃. Both hydroxyapatite and β-TCP [β-Ca_3(PO_4)_2] were formed on pure nickel, pure iron, and stainless steel plates at 200℃. It seems that the incorporation of the metal ions released from the electrode decreased the Ca/P ratio of the deposit due to the formation of other compounds except hydroxyapatite.
日本歯科理工学会の論文