目的 提升选区激光熔化成形（SLM）Ti6Al4V合金的生物活性。方法 研究了不同电压对微弧氧化技术（MAO）在SLM Ti6Al4V表面制备含钙磷生物陶瓷涂层的影响。通过扫描电子显微镜（SEM）、能量分散X射线光谱（EDS）和X射线衍射仪（XRD）等分析和研究了不同电压下微弧氧化涂层的显微结构、组织和成分等性能，并通过接触角测量和模拟体液浸泡实验及后续的红外光谱分析（FT-IR）等检验涂层的生物活性。结果 经过微弧氧化处理，SLM Ti6Al4V表面含一定比例的钙磷且与基体结合良好的涂层，涂层的主要物相为锐钛矿，涂层厚度、钙/磷含量以及锐钛矿组织含量均随电压的升高而增加。300 V电压制备的膜层，表面均匀，钙、磷的原子数分数分别为7.04%、9.65%。涂层截面质量均一，厚度适宜，为3.19 μm，且随着涂层增厚，基体元素Ti含量下降，Ca、P和O元素的含量增加。300 V电压制备的膜层润湿性相比SLM Ti6Al4V基体的更好，膜层在SBF溶液中浸泡35天后，钙、磷比由0.73增加到1.2，并有羟基磷灰石生成。结论 SLM Ti6Al4V通过微弧氧化技术制备生物活性膜层的最优电压为300 V，经过微弧氧化后的钛合金表面生物活性得到提升。

The work aims to improve the bioactivity of the selective laser melting (SLM) produced Ti6Al4V alloy. The effect of different voltages on the preparation of calcium-phosphate bio-ceramic coatings on the SLM Ti6Al4V surface by micro-arc oxidation (MAO) technology was studied. The microstructure, morphology, and chemical compositions of MAO coatings prepared under different voltages were analyzed and studied by scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS) and X-ray diffraction (XRD). The biological activity of coatings was inspected by contact angle measurement, simulated fluid immersion experiment and subsequent FT-IR. A coating with a certain proportion of calcium and phosphorus was formed on the surface of SLM Ti6Al4V and well combined with the matrix after MAO treatment. The main phase of coating was anatase. Thickness of the coatings, the content of calcium and phosphorus and the content of anatase increased as the voltage increased. The coating produced by 300 V voltage had uniform surface and appropriate contents of Ca and P, which were 7.04% and 9.65%, respectively. The cross-section was uniform and the thickness was suitable, which was 3.19 μm. With the thickening of the coating, the content of matrix element Ti decreased and the content of Ca, P and O increased. The calcium phosphate ratio of the coating produced by 300 V was increased from 0.73 to 1.2 after soaked in SBF solution for 35 days, so the wettability of coating was better than that of SLM Ti6Al4V substrate and hydroxyapatite was generated. The optimum voltage to prepare the biological active coating on SLM Ti6Al4V by MAO is 300 V and the biological activity of Ti alloy is improved by MAO.