生物可降解Fe-O薄膜的制备及性能表征

Deposition and Characterization of Biodegradable Fe-O Films

纯铁由于其可降解性和无毒性,在血管支架材料领域具有潜在的应用前景。本文采用等离子体浸没离子注入与沉积(PIII&D)方法,在纯铁表面沉积一层Fe-O薄膜以改善纯铁表面的抗腐蚀性,用X射线光电子能谱和X射线衍射研究了薄膜表面成分和物相结构,用极化腐蚀试验研究了薄膜在模拟体液中的腐蚀行为,采用划痕试验法评价了薄膜与基体的结合力。结果表明:采用PIII&D法制备Fe-O薄膜,不同氧流量下沉积的薄膜具有不同的物相结构,当氧流量较小时,在纯铁表面形成一层FeO薄膜,随着氧流量的增加,FeO相逐渐转变为Fe3O4相。通过划痕试验和腐蚀试验发现,氧流量为3.4sccm时,形成的FeO薄膜与基体具有较好的结合力,并可对基体产生较好的保护作用,从而大大提高了纯铁表面在模拟体液中的抗腐蚀性能。

The Fe-O films were deposited on pure iron substrates by immersion ion implantation and deposition （Pro＆D） to improve the medical performance of stents.The microstmctures and mechanical properties of the films were characterized with X-my diffraction （XRD）, glancing angle X-ray diffraction （GAXRD）, and X-ray photoelectron spectroscopy （XPS） and conventional mechanical probes. The impact of film growth conditions on the films was studied and the corrosion characteristics of the Fe-O films were evaluated with the simulated body fluid （SBF）. The results show that the oxygen flow rate strongly affects the phase structures of the Fe-O films and the interfacial adhesion. For instance, Fe- O forms at low oxygen flow rates;whereas at an increased oxygen flow rate,FeO phase changes into Fe304.phase. At an oxygen flow rate of 3.4sccm, Fe-O films with high corrosion resistance and fairly strong interfacial adhesion can be grown on iron substrates. We suggest that Fe-O films coated stainless steel be a potential material for stent fabrication.