钛表面FHAP涂层的电沉积制备及其FTIR特征研究

在含有Ca2+，PO3-₄和F-的电解液中，用电化学恒电流方法，在工作电流为0.9 mA温度为60 ℃的条件下沉积60 min，在医用钛(Ti)表面上制得含氟羟基磷灰石(FHAP)涂层。采用扫描电镜(SEM)、能量弥散X射线谱(EDS)、X射线衍射(XRD)对涂层进行表征，用傅里叶变换红外光谱(FTIR)考察了氟离子的引入对涂层构象和生物活性的影响。结果表明：氟部分取代磷灰石中的羟基，FHAP晶格常数变小，涂层相貌由疏松的微米级的菊花瓣状变化为致密的纳米级的尖锥状。FTIR分析表明，涂层中羟基的伸缩和弯曲振动模式的对称性发生了改变，模拟体液浸泡后涂层覆盖碳磷灰石，涂层生物活性良好。

Preparation of Fluoridated Hydroxyapatite Coatings on Titanium by Electrolytic Deposition and Its FTIR Characteristics

Fluoridated hydroxyapatite coatings(FHAP) were prepared on titanium substrate by electrochemical deposition technique containing Ca2+,PO3-4,and F-ions.The deposition was all conducted at a constant current of 0.9 mA for 60 min at 60 ℃.The as-prepared coatings were exa mined by scanning electron microscope(SEM),energy-dispersive Xray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR) and Xray diffraction(XRD) tests.The results indicate that the FHAP cryatals take the morphology of nanoscale-rodlike cone rather than the micron-daisy petal,and the composite coating becomes more compact.The FTIR test indicates that the symmetry of stretching and bending vibration modes of hydroxyl changed,simulated body fluid immersion test proved that the FHAP coating had induced carbonate-apatite formation,indicating that the composite coating possesses excellent biocompatibility.