医用316L不锈钢支架表面沉积(Fe/Pd)n薄膜的研究

Deposition of (Fe/Pd)n Film on Medical 316L Stainless Steel Stent Surface

摘要:

采用真空电弧离子镀技术，在医用316L不锈钢支架上沉积近等原子比的(Fe/Pd)n多层膜。用X射线衍射、扫描电镜、电子能谱研究(Fe/Pd)n多层膜的晶体结构、形貌和成分，分析相的转变。用CTCC-1数字磁通磁场测量仪测量样品的磁性。结果表明：医用316L不锈钢支架表面磁性膜的最佳结构为“Pd/Fe/Pd”，经扩散热处理后，(Fe/Pd)n薄膜从fcc结构转变为fct结构，薄膜均匀、致密、结合强度良好，有效磁场强度可达5×10-4 T以上，有效磁性可维持6个月。

Abstract:

Near-equiatomic (Fe/Pd)n multilayer films were deposited on the surface of medical 316L stainless steel stents by vacuum arc ion plating technology. The crystal structure, morphology and component of (Fe/Pd)n multilayer films were studied by XRD, SEM, and electronic energy spectrum and the phase transformation was also analyzed. The magnetic performances of the samples were detected by CTCC-1 numeral magnetic flux and magnetic field measurement instrument. The results indicate that the optimum structure of superficial magnetic films on medical 316L steel stents is “Pd/Fe/Pd”. After diffusion heat treatment, (Fe/Pd)n films changed from face-center-cubic (fcc) structure to face-center-tetragonal (fct) structure. The film is uniform with high density and good bonding strength. At the same time, its effective magnetic strength is to up to 5×10-4 T for 6 months.