摘要
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 concentration of triethanolamine （TEA） on the hydroxyapatite（HA）/TiO2 composite coating was investigated via the electrophoretic deposition. The dispersive mechanism of TEA in the suspension was also analyzed. The results show that the average particle size of HA/TiO2 nanoparticles is 24.5 nm and the Zeta potential on the particle surface is 67.7 mV at the concentration of TEA of 30 mL/L in the suspension, illustrating the optimum stability of suspension. The microtopography of the HA/TiO2 composite coating is uniform without agglomeration and cracks, the atomic ratio of Ca and P is 1.76, which is similar to that in the human bone. The thinkness of the HA/TiO2 composite coating is approximately 25 μm. The corrosion potential of the HA/TiO2 composite coating immersed in simulated body fluids （SBF） for 1 h is 37.88 mV, and the corrosion current density is 0.21 mA/cm2, showing the optimum corrosion resistance of the HA/TiO2 composite coating. Also, the maximum adhesion strength is 8.85 MPa at the concentration of TEA of 30 mL/L.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2016年第9期1365-1372,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51274039)
广东产学研项目(2014B090901003)资助
关键词
电泳沉积
三乙醇胺
双电层
羟基磷灰石
electrophoretic deposition
triethanolamine
electrical double layer
hydroxyapatite
