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首页> 外文期刊>Coatings >TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys
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TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys

机译：由高功率脉冲磁控溅射沉积的锡/ NBN纳米级多层涂层，以保护医疗级COCRMO合金

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This study describes the performance of nanoscale multilayer TiN/NbN coatings deposited on CoCrMo medical-grade alloys by utilising novel mixed high power impulse magnetron sputtering (HIPIMS) and direct current unbalanced magnetron sputtering (UBM) technique in an industrial size vacuum coater. Scanning electron microscopy analysis showed that these coatings were extremely dense without any intercolumnar voids. The coating exhibited high hardness of 28 GPa, as well as low friction and wear coefficient of 0.7 and 1.4 × 10?14 m3·N?1·m?1, respectively, as compared to the bare material. Scratch tests revealed superior coating to substrate adhesion due to the HIPIMS etching prior to coating deposition. Energy-dispersive X-ray analysis of the wear debris generated during the impact test together with focused ion beam cross-section analysis in different locations of the impact crater revealed the coating failure mechanism and further confirmed the excellent coating to substrate bonding strength. Potentiodynamic polarisation tests in NaCl and Hank’s solutions revealed the clear passivation behaviour, several orders of magnitude lower corrosion currents, and high pitting potentials of the coating, which guarantee excellent protection to the base alloy in such aggressive environments. Inductively coupled plasma mass spectrometry analysis of Hank’s solution containing corrosion debris of the coated sample revealed that the leaching of harmful metal ions from the base material was reduced to below the detection limit of the technique, thus demonstrating the high barrier properties of the coating.
机译：本研究描述了通过利用新颖的混合高功率脉冲磁控溅射（HIPIMS）和在工业尺寸真空涂布机中的直流不平衡磁控溅射（UBM）技术，纳米级多层锡/ NBN涂层的性能。扫描电子显微镜分析表明，这些涂层非常致密，没有任何淋视空隙。与裸材料相比，涂层表现出高硬度为28GPa，以及0.7和1.4×10·14m 3·n？1·m≤1的低摩擦系数。由于在涂覆沉积之前，刮擦试验显示出底部蚀刻的衬底粘附的卓越涂层。在冲击试验台的不同位置的抗冲击试验期间产生的磨损碎片的能量分散X射线分析在冲击喷雾器的不同位置显示出涂层失效机构，进一步证实了基底粘合强度的优异涂层。 NACL和HANK的解决方案中的电位动力学偏振测试揭示了明显的钝化行为，几个幅度较低的腐蚀电流，以及涂层的高点电位，这保证了对这种侵蚀性环境中的基础合金的优异保护。感应耦合等离子体质谱分析涂覆样品的腐蚀碎屑的Hank溶液的分析显示，从基材的浸出到低于该技术的检测极限下降，从而证明了涂层的高阻隔性。

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