Jurgeleit Till, Quandt Eckhard, Zamponi Christiane
Chair for Inorganic Functional Materials, Institute for Materials Science, Faculty of Engineering, University of Kiel, Kiel 24143, Germany.
Materials (Basel). 2016 Nov 15;9(11):928. doi: 10.3390/ma9110928.
Iron-based materials proved being a viable candidate material for biodegradable implants. Magnetron sputtering combined with UV-lithography offers the possibility to fabricate structured, freestanding foils of iron-based alloys and even composites with non-solvable elements. In order to accelerate the degradation speed and enhance the mechanical properties, the technique was used to fabricate Fe-Au multilayer foils. The foils were annealed after the deposition to form a homogeneous microstructure with fine Au precipitates. The characterization of the mechanical properties was done by uniaxial tensile tests. The degradation behavior was analyzed by electrochemical tests and immersion tests under in vitro conditions. Due to the noble Au precipitates it was possible to achieve high tensile strengths between 550 and 800 MPa depending on the Au content and heat treatment. Furthermore, the Fe-Au foils showed a significantly accelerated corrosion compared to pure iron samples. The high mechanical strength is close to the properties of SS316L steel. In combination with the accelerated degradation rate, sputtered Fe-Au foils showed promising properties for use as iron-based, biodegradable implants.
铁基材料被证明是可生物降解植入物的一种可行候选材料。磁控溅射与紫外光刻相结合，为制造铁基合金甚至含有不可溶元素的复合材料的结构化、独立箔材提供了可能性。为了加快降解速度并提高机械性能，该技术被用于制造铁 - 金多层箔材。箔材在沉积后进行退火处理，以形成具有细小金析出物的均匀微观结构。通过单轴拉伸试验对机械性能进行表征。通过体外条件下的电化学试验和浸泡试验分析降解行为。由于存在贵金属金析出物，根据金含量和热处理情况，有可能实现550至800兆帕之间的高拉伸强度。此外，与纯铁样品相比，铁 - 金箔材显示出显著加速的腐蚀。其高机械强度接近SS316L钢的性能。结合加速的降解速率，溅射铁 - 金箔材作为铁基可生物降解植入物显示出有前景的性能。
