目的：研究水热时间对TC4钛合金微弧氧化膜合成羟基磷灰石( HA)的影响。方法对TC4钛合金微弧氧化膜进行不同时间的水热合成处理,分析其微观形貌、成分及相结构,观察其在模拟体液中浸泡5周后的形貌及结构变化。结果水热处理提高了微弧氧化膜的Ca/P摩尔比,使非晶态钙磷化合物转化为HA晶体,随着水热时间的延长,HA衍射峰数量增多且强度增加。在模拟体液中浸泡5周后,微弧氧化膜表面仅有微量磷酸钙形成,而如水热合成后再浸泡,氧化膜表面的HA几乎完全转化为磷酸钙。结论水热处理有助于钛合金微弧氧化膜表面合成HA晶体。在8 h内,水热时间越长,氧化膜表面的HA含量越高,模拟体液中浸泡后形成的磷酸钙也越多,与人体的相容性越好。
Objective To study the influence of hydrothermal time on hydroxyapatite ( HA) synthesis of microarc oxidized TC4 alloy. Methods The microarc oxidation ( MAO) coatings on TC4 alloy were treated by different hydrothermal synthesis time. The morphology, composition and phase structure of different coatings were analyzed by SEM, EDS and XRD. Besides, the changes of morphology and phase structure were studied when different MAO coatings were soaked in SBF for 5 weeks. Results Hydrothermal synthesis increased the molar ratio of Ca and P in MAO coating, and changed the amorphous calcium phosphate compounds into HA crystals. The diffraction peak of HA was increased and enhanced continuously with the increasing hydrothermal synthesis time. On-ly a little calcium phosphate was produced when MAO coating was soaked in SBF for 5 weeks, whereas the HA crystals of MAO coating treated by hydrothermal synthesis were almost completely converted to calcium phosphate after 5 weeks soaking in SBF. Conclusion Hydrothermal synthesis was helpful to form HA crystals on microarc oxidized titanium. HA crystals increased when hy-drothermal synthesis time was extended from 0 to 8 h, and then more calcium phosphate was produced on the surface of MAO coa-ting after soaking in SBF, which accordingly had better compatibility with human body.
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