钛基材上电化学沉积羟基磷灰石

Hydroxyapatite Coatings Deposited Electrochemically on Titanium Substrate

通过电沉积法在经过阳极氧化的钛基材表面沉积磷酸钙盐涂层,再经碱热处理使磷酸钙涂层转变为羟基磷灰石涂层。扫描电镜(SEM)观察了阳极氧化后生成的TiO2纳米管的微观结构,以及生成的羟基磷灰石的形貌。X射线衍射仪(XRD)分析了涂层的相组成,同时测定了涂层与基体的结合强度。试验结果表明:电沉积涂层CaHPO4·2H2O经碱处理后转变为羟基磷灰石;电沉积添加双氧水与钛基材经过阳极氧化后使得涂层与基体结合强度有所提高。模拟体液浸泡试验表明涂层具有良好的生物活性。

The calcium phosphate coatings, electrodeposited on the anodized surface of Ti., were converted to hydroxyapatite coatings in alkaline solution in this work. The morphologies of titanium oxide nanotubes and hydroxyapatite were observed by means of scanning electron microscope（SEM）. In addition, the phase structure and compositions of the HA coatings were determined by X-ray diffractometer（XRD）.Meanwhile the bonding strength of the interface between the HA coatings and the substrate was detected. The results demonstrated that the electrochemically deposited coatings were dicalcium phosphate dihydrate （CaHPO4. 2H2O, DCPD）, and then were transformed into hydroxyapatite after treatment with alkaline solution. The bonding strength of the interface between HA coatings and substrate was improved when the substrate was treated by anodic oxidation or H2O2 was used during the electrodeposition. The coatings showed a good bioactivity in a simulated body fluid.