多孔钛表面无裂纹生物活化层的制备及表征

Preparation and Characterization of Bioactive Coating without Cracks on Potous Titanium Surface

摘要:

采用碱热处理方法对多孔钛进行了表面活化处理，获得了无裂纹的网状微孔结构的生物活化层。利用扫描电镜（SEM）、X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）等设备对生物活化层进行表征，最后用模拟体液中浸泡的方法检测了该活化层的生物活性。结果表明：当NaOH溶液浓度低于8 mol/L，碱处理时间少于36 h时，多孔钛孔内外壁都可获得无裂纹的生物活化层，该活化层呈现网状微孔结构，是由金红石结构的二氧化钛和钛酸钠组成的混合物质。浸泡SBF后结果显示该活化层在浸泡3 d后就已诱导产生了类骨的碳羟基磷灰石，表现出了很好的生物活性。

Abstract:

A bioactive coating with no cracks was produced on the porous titanium by alkali-heat treatment. The morphology, element content and phase composition of the coating were analyzed by SEM, XRD and XPS. It is found that a micro-network structure mainly composed of bioactive sodium titanate and rutile covers the interior and exterior of porous titanium cells. And bioactive network without cracks is achievable with a given set of process parameters of the alkaline solution concentration and alkali-heat treatment time. After immersion into the SBF solution for 3 d, a carbonate-hydroxylapatite was detected by XRD on the cell surface of the porous titanium, showing a good compatibility of the porous titanium with bone.