钛合金微弧氧化法制备稀土/磷酸钙生物复合涂层

Fabrication of Bioactive Composite Rare Earth/Calcium Phosphate Coatings on Titanium Alloy by Micro-Arc Oxidation Technique

采用微弧氧化的方法在Ti-6Al-4V基体上制备稀土/磷酸钙生物复合涂层。研究了稀土在微弧氧化制备稀土/磷酸钙复合涂层中的作用及该涂层在模拟体液中的摩擦磨损性能。与单一涂层相比,稀土盐的添加有效提高了涂层的厚度;经模拟体液浸泡后的涂层结合强度以及涂层在模拟体液中的摩擦磨损性能都明显提高。SEM观察表明,该复合涂层的表面多孔形貌分布更为均匀;XRD分析显示,稀土盐的添加并没有改变涂层的磷酸钙相生成。

Rare earth/calcium phosphate composite coatings were prepared on the surface of Ti-6Al-4V by micro-are oxidation （MAO） technique. The effect of the rare earth on the preparation of rare earth/calcium phosphate composite coatings and the friction and wear properties of the coatings in the simulated body fluid （SBF） has been investigated. The addition of rare earth may effectively improve the thickness of the coatings. The adhesion strength dipped with SBF and the friction and wear properties in the SBF of coatings have also been enhanced significantly compared with those of coatings of calcium phosphate coatings without rare-earth. The surface morphology and the phase composition of the MAO coatings were characterized by SEM and XRD, respectively. The results demonstrate that the porous morphology of the composite coatings is distributed more uniformly than that of the coatings without rare earth. XRD analysis indicates that the phase of calcium phosphate is slightly dependent on the addition of rare earth.