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研究了不同三乙醇胺(TEA)浓度悬浮液对电泳沉积法制备的羟基磷灰石(HA)/Ti O_2梯度复合涂层性能的影响,并分析了悬浮液中TEA的分散机理。研究表明:当悬浮液中三乙醇胺(简称TEA)的体积浓度为30 m L/L时,悬浮液中HA/Ti O_2的平均粒径最小(24.47 nm),Zeta电位最高(67.7 m V),说明此时悬浮液的稳定性最高,HA/Ti O_2梯度复合涂层表面形貌均匀,而且没有团聚和裂纹出现,其厚度均匀,大约在25μm左右;涂层Ca与P的元素原子比为1.76,与人体骨中的钙磷比十分接近;涂层在模拟体液中浸泡1 h后,腐蚀电位最高(37.88 m V),腐蚀电流密度最小(0.21 m A/cm2),说明此时涂层的耐腐蚀性最好;当悬浮液中TEA浓度为30 m L/L时,涂层结合强度最高,拉伸法测得此时HA/Ti O_2梯度复合涂层的结合力达到8.85 MPa。
The effect of different TEA concentration suspensions on the hydroxyapatite (HA) / TiO 2 gradient composite coating prepared by electrophoretic deposition was studied. The dispersion mechanism of TEA in suspension was also studied. The results showed that the HA / TiO_2 particles had the smallest average diameter (24.47 nm) and the highest Zeta potential (67.7 mV) when the concentration of triethanolamine (TEA) in the suspension was 30 m L / L. The results show that the suspension has the highest stability at this time. The surface morphology of the HA / TiO_2 gradient composite coating is uniform, and there is no agglomeration and cracks. The thickness of the coating is about 25μm. The elemental atomic ratio of Ca and P is 1.76 , Which is close to the ratio of calcium to phosphorus in the human bone. The highest corrosion potential (37.88 mV) and the lowest corrosion current density (0.21 m A / cm2) were observed after the coating immersed in simulated body fluid for 1 h, Corrosion resistance is the best. When the concentration of TEA in the suspension is 30 m L / L, the bond strength of the coating is the highest, and the binding force of the HA / TiO 2 gradient composite coating reaches 8.85 MPa at this time.