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采用超声微弧氧化技术(UMAO)在医用Ti-3Zr-2Sn-3Mo-25Nb钛合金表面制备生物活性涂层,并研究了磷酸盐电解液浓度和pH值对涂层表面形貌、涂层成分、孔隙率、及涂层厚度的影响。结果表明:涂层主晶相由金红石(Rutile)和锐钛矿(Anatase)结构的TiO_2相组成,涂层较无超声辅助涂层更致密均匀,与基体具有更高的结合强度。电解液中磷酸盐浓度和pH值增大时,阳极表面吸附阴离子磷酸氢根和OH-能力提高,从而易于钙盐胶体微粒发生电泳沉积过程。沉积于表面的钙、磷离子再经超声空化、微射流和微弧高温烧结过程扩散进入涂层内部,有利于提高涂层的生物活性。当磷酸盐浓度为0.18 mol/L,电解液pH值为4.9时,涂层厚度达76μm,孔隙率为22%,结合力为1.3 N,涂层表面分布大量微孔(3~10μm),为成骨细胞粘附生长提供较好空间。
The bioactive coating was prepared on the surface of medical Ti-3Zr-2Sn-3Mo-25Nb titanium alloy by ultrasonic micro-arc oxidation (UMAO). The effect of phosphate electrolyte concentration and pH value on the surface morphology, , Porosity, and coating thickness. The results show that the main phase of the coating is composed of rutile and anatase TiO 2 phases. The coating is denser and uniform than that without ultrasonic assisted coating and has higher bonding strength with the matrix. When the concentration of phosphate and pH in the electrolyte increases, the ability to adsorb anionic hydrogen phosphate and OH- on the surface of the anode increases, making it easier for electrophoresis deposition of calcium salt colloidal particles. The calcium and phosphorus ions deposited on the surface diffuse into the coating through ultrasonic cavitation, micro-jet and micro-arc high temperature sintering, which is beneficial to improve the biological activity of the coating. When the phosphate concentration is 0.18 mol / L and the electrolyte pH is 4.9, the coating thickness is 76 μm, the porosity is 22%, and the binding force is 1.3 N. A large number of micropores (3 ~ 10 μm) Osteoblasts provide better space for adhesion growth.