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首页> 外文期刊>Materials science & engineering >An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sintering technique for implant applications
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An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sintering technique for implant applications

机译：通过直接金属激光烧结技术制备的生物医学CoCrMo合金用于植入物的评估

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摘要

CoCrMo alloys have been used for several decades in implantable devices due to their favourable mechanical properties, low wear rate in addition to good biocompatibility and high corrosion resistance. These alloys are conventionally produced via casting and/or forging route, however additive manufacturing techniques being recently employed in their fabrication. In this work, CoCrMo samples were produced by direct metal laser sintering additive manufacturing process. The microstructure and surface composition were examined employing scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy (XPS). The corrosion resistance was measured in 0.14 M sodium chloride solution and in phosphate buffered solution (PBS) both with and without addition of albumin at pH 7.4 and 37 degrees C. For this, potentiodynamic tests in addition to electrochemical impedance spectroscopy were employed. The studied CoCrMo alloy exhibits a good corrosion resistance in solutions tested being the highest in PBS solution without albumin addition. The XPS analysis showed that the passive film composition and its thickness are not modified by the adsorbed layer. Microstructural analysis revealed occurrence of strain-induced martensitic transformation.
机译：CoCrMo合金具有良好的机械性能，低磨损率，良好的生物相容性和高耐腐蚀性，因此在植入式设备中已经使用了数十年。这些合金通常通过铸造和/或锻造途径生产，但是最近在其制造中采用了增材制造技术。在这项工作中，CoCrMo样品是通过直接金属激光烧结添加剂制造工艺生产的。使用扫描电子显微镜，X射线衍射和X射线光电子能谱（XPS）检查微观结构和表面组成。在pH 7.4和37℃下在添加和不添加白蛋白的条件下，在0.14 M氯化钠溶液和磷酸盐缓冲溶液（PBS）中测量了耐腐蚀性。为此，除了电化学阻抗光谱法外，还进行了电位动力学测试。所研究的CoCrMo合金在测试溶液中显示出良好的耐腐蚀性，是在不添加白蛋白的PBS溶液中最高的。 XPS分析表明，钝化膜的组成及其厚度没有被吸附层改变。显微组织分析表明发生了应变诱发的马氏体转变。

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