目的 提高Ti-15Mo合金的生物相容性。方法 通过电解液中Sr元素替代Ca元素，采用微弧氧化(MAO)与水热处理相结合的方法，在Ti-15Mo合金表面制备不同Sr含量的羟基磷灰石(HA)涂层。借助X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析膜层的微观组织结构、相组成、接触角以及在模拟体液中的磷灰石诱导能力。结果 电解液中的Sr含量会影响Ti-15Mo合金在恒流模式下MAO的电压，使得不同Sr含量样品的膜层微孔孔径与孔隙率随着Sr含量的增加先降低、后升高。水热处理后，膜层表面出现HA与Sr-HA相，样品表面Sr-HA的结晶度随着Sr含量的增加先增加、后降低。在30-Sr样品中，膜层表面Sr-HA的结晶度最好，Sr-HA晶柱分布均匀，呈现稳定的六棱柱形。此外，水热处理后的30-Sr样品，接触角达到10.5°，表现出优异的亲水性。模拟体液(SBF)浸泡实验结果显示，Sr离子的加入可以提高样品表面膜层的磷灰石诱导能力，尤其在30-Sr样品中，膜层表面的磷灰石沉积厚度达到58.87 μm。结论 Sr离子的加入可以有效提高Ti-15Mo合金表面的磷灰石诱导能力，其中，在电解液中替代加入30%(质量分数)Sr离子时，膜层表面的磷灰石诱导能力最强，表现出良好的生物相容性。

This paper aims to improve the biocompatibility of Ti-15Mo alloy. Through micro arc oxidation (MAO) with Ca element replaced by Sr element in electrolyte and subsequent hydrothermal treatment, hydroxyapatite (HA) coatings are made on the surface of Ti-15Mo alloy. With the help of X-ray diffraction (XRD) and scanning electron microscope (SEM), this paper analyzes the microstructure, phase composition, contact angle and apatite inducing ability in the simulated body fluid of the coating. The results indicate that the MAO voltage under constant current mode is affected by the Sr concentration in the electrolyte and with the increase of Sr concentration, the scale and porosity of micro-pores of the coating with different Sr concentration first reduce and then increase. HA and Sr-HA phases had formed in the surface of Ti-15Mo alloy after MAO and hydrothermal treatment. Meanwhile, the Sr-HA crystallinity in the coating showed a rising trend with the increase of Sr concentration. The best Sr-HA crystallinity in coatings formed in the 30-Sr specimen, and the distribution of Sr-HA crystal columns with a stable hexagonal shape presented uniformly. In addition, the contact angle after hydrothermal treatment also presents excellent hydrophilicity, and the contact angle in 30-Sr specimen after hydrothermal treatment is 10.5°. Apatite induction ability of the coating of Ti-15Mo alloy in the simulated body fluid (SBF) has enhanced due to addition of Sr ions in the electrolyte during the MAO. The best apatite induction ability and biocompatibility of the coating appear in 30-Sr specimen, and its apatite deposition thickness is 58.87 μm. Apatite induction ability of Ti-15Mo alloy can be significantly improved by adding strontium ions in the electrolyte. When 30% Sr ions are added into the electrolyte, the apatite induction ability of the coating is the best and it also has good biocompatibility.