多级结构超疏水钛合金表面制备及性能

Preparation and Properties of Superhydrophobic Titanium Alloy with Hierarchical Structure

摘要:

本文以Ti6Al4V钛合金为基材，利用微弧氧化和水热法在钛合金表面形成微纳复合多级粗糙结构，进一步通过氟化处理得到具有多级结构的超疏水钛合金表面。利用傅里叶变换红外光谱、能谱仪和场发射扫描电子显微镜等对材料表面结构和组成进行了系统的表征。利用水接触角对材料表面润湿性能进行了分析。因此，通过表面多级粗糙结构的构建以及低表面能处理，能够实现超疏水表面的构建。血小板黏附和溶血率测试结果表明材料表面具有较好的血液相容性。材料表面修饰前后耐腐蚀性能测试表明，超疏水结构能有效地降低材料表面与血液和腐蚀液的接触面积，进而降低材料表面与血细胞的相互作用，同时可以有效提高材料表面的耐腐蚀性能。

关键词:钛合金;超疏水;多级结构;血液相容性;抗腐蚀性

Abstract:

A hydrophobic Ti6Al4V (TC4) titanium alloy with muti-level roughness surface was fabricated with micro-arc oxidation and hydrothermal reaction, combined with fluorination treatment. Fourier transform infrared spectroscopy, energy dispersive spectroscopy, and field emission scanning electron microscopy (FESEM) were used to characterize the surface structures and compositions of the materials. Water contact angle measurement was used to measure the surface wetting property of the modified TC4 as well. Therefore, the construction of a superhydrogphobic surface was successfully achieved by multilevel roughness structures and low surface energy treatment. Furthermore, the platelets adhesion and hemolysis assays suggested superior hemocompatibility of the TC4 surface after modification. Corrosion resistance tests before and after surface modification of the material indicated that the superhydrophobic structures on the TC4 surface could effectively reduce the contacting space between the interface of materials and the corrosive fluid and blood components, thereby weaken the interaction between material surface and the blood cells, such as platelets and red blood cells, and meanwhile could greatly improve the corrosion resistance of TC4.

Key words:TC₄; surface modification; superhdrophobic surface; hemocompatibility;corrosion resistance