水熱法によるHAp/CaTiO_3多層膜のチタニウム上への形成

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A multilayer material consisting of hydroxyapatite (HAp) and calcium titanate (CaTiO_3) was hydrothermally synthesized on a titanium substrate. The titanium substrate was treated with a mixed solution of CaCl_2 and KOH at 150℃ to form a CaTiO_3 layer. The thickness of the CaTiO_3 layer increased with increasing KOH concentration, but the adhesion between the coating layer and the substrate diminished. In an alkaline solution such as KOH, titanium substrates dissolved and reacted with calcium ions, and a CaTiO_3 layer precipitated on the substrate. A layer of HAp fromed on the CaTiO_3 coating layer from the mixed solution containing CaCl_2, K_2HPO_4 and KOH, when the molar ratio of Ca/P was less than 1.67.which was the ratio of stochiometric HAp. Calcium was supplied from both the reacting solution and the CaTiO_3 layer, and was precipitated as HAp. Decomposition of a part of CaTiO_3 and the consequent supply of Ca from the coating layer were necessary to form the HAp layer. The multilayer formed without peeling when HAp was precipitated on the CaTiO_3 layer at 220℃ for 24 h with a pH of 8-10. The adhesion force between the substrate and the CaTiO_3 layer did not decrease after the formation of HAp, though the force decreased with increasing KOH concentration during synthesis of the CaTiO_3 layer. After soaking the HAp/CaTiO_3 multilayer in simulated body fluid (SBF) for 35 d at 37℃, the multilayer was covered with very fine needlelike particles of HAp, though neither the surface of the CaTiO_3 coating layer nor the titanium substrate were altered after the same treatment.
社団法人日本セラミックス協会の論文
1999-10-01

水熱法によるHAp/CaTiO_3多層膜のチタニウム上への形成

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