Comparison of the Fatigue Performance of Commercially Produced Nitinol Samples versus Sputter-Deposited Nitinol
Comparison of the Fatigue Performance of Commercially Produced Nitinol Samples versus Sputter-Deposited Nitinol
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商业生产的镍钛诺样品与溅射沉积镍钛诺样品的疲劳性能比较
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
E. Quandt
中科院分区：
文献类型：
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作者：
G. Siekmeyer;A. Schüßler;R. L. Miranda;E. Quandt
自膨胀血管植入物通常由镍钛诺管制造，使用激光切割，形状设置和电抛光工艺。这些装置的机械和疲劳性能受到原材料及其加工过程的影响，如熔化过程和随后的冷热成形过程。目前的趋势是使用夹杂物较少的原材料来提高疲劳性能。进一步的设备小型化和更高的疲劳寿命要求将推动对更小的夹杂物和新的制造方法的需求。如前所述，由标准加工的镍钛诺制成的医疗器械的高周疲劳区通常约为0.4-0.5%半交变应变。然而，这些结果在很大程度上取决于铸锭和半成品材料、应用的制造工艺、测试样品的最终尺寸和应用的测试方法。通过溅射沉积制造是有利的，因为它允许制造微图案镍钛诺薄膜器件，没有小毛刺，热影响区，微裂纹或任何碳化物污染，以及复杂部件的制造，例如3D几何形状。然而，目前关于基于这种溅射沉积镍钛诺的真实支架装置的疲劳行为的数据有限。为了表征微图案镍钛诺薄膜材料，首次进行了详细的研究（例如，使用金相方法，腐蚀，拉伸和疲劳测试）。
Self-expanding vascular implants are typically manufactured from Nitinol tubing, using laser cutting, shape setting, and electropolishing processes. The mechanical and fatigue behavior of those devices are affected by the raw material and its processing such as the melting process and subsequent warm and cold forming processes. Current trends focus on the use of raw material with fewer inclusions to improve the fatigue performance. Further device miniaturization and higher fatigue life requirements will drive the need toward smaller inclusions and new manufacturing methods. As published previously, the high-cycle fatigue region of medical devices from standard processed Nitinol is usually about 0.4-0.5% half-alternating strain. However, these results highly depend on the ingot and semi-finished materials, the applied manufacturing processes, the final dimensions of test samples, and applied test methods. Fabrication by sputter deposition is favorable, because it allows the manufacturing of micro-patterned Nitinol thin-film devices without small burrs, heat-affected zones, microcracks, or any contamination with carbides, as well as the fabrication of complex components e.g., 3D geometries. Today, however, there is limited data available on the fatigue behavior for real stent devices based on such sputter-deposited Nitinol. A detailed study (e.g., using metallographic methods, corrosion, tensile, and fatigue testing) was conducted for the first time in order to characterize the micro-patterned Nitinol thin-film material.
影响因子：
3.6
作者：
de Miranda, Rodrigo Lima;Zamponi, Christiane;Quandt, Eckhard
通讯作者：
Quandt, Eckhard