通过电泳沉积的方法在生物医用钛基体表面制备羟基磷灰石(HA)/Al/壳聚糖(CS)复合涂层,通过高温烧结分解CS颗粒并制备钛基多孔HA/Al2O3复合生物陶瓷涂层.通过粘结-拉伸实验测定涂层与基材的结合强度;XRD和SEM对涂层的物相组成和形貌进行表征;CHI660C电化学工作站测试涂层在模拟体液中的耐蚀性能.研究表明,经过热处理后的涂层为表面可形成平均孔径为5μm的多孔HA/M2O3,涂层厚度可达25μm,涂层中的HA颗粒致密粘连,Al在高温条件下反应成Al2O3从而使涂层与基体的结合强度最高可达30.5MPa,涂层的涂覆使Ti金属在人体模拟体液中具有良好的耐腐蚀能力.
A hydroxyapatite (HA)-Al-chitosan (CS) composite bioceramic coating was widely applied to the surfaces of pure titanium by the electrophoretic deposition (EPD) method.The mechanism of EPD of HA/Al/CS composites was discussed.The porous HA/Al2O3 coatings were obtained as average pore diameter of 5μm after the heat treatments with temperatures 700℃ for 2h in air.This approach is especially attractive for the fabrication of polymer-ceramic composites,where CS can provide porous coating,whereas Alprovide Al2O3 to improve the coating adherence.The adhesive force between the HA/Al2 O3 porous coatings and pure titanium was approximately 30.5MPa.The porous HA/Al2O3 coatings provide improved bioactivity and biocompatibility of pure titanium in the simulated body fluid solution.
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