Abstract Metallic biomaterials have been widely used due to their excellent mechanical properties. Cobalt-chromium-molybdenum alloys, in particular are among the safest for the fabrication of orthopedic prostheses. Nevertheless, the liberation of metallic ions as a result of wear has become a problem due to adverse biological reactions. Thus, surface modification through thermochemical treatments and ceramic coatings may be used to improve the tribological properties of the alloy. In this work, a duplex coating obtained from a boriding thermochemical treatment plus an aluminum-chromium oxynitride coating created by physical vapor deposition was synthesized on an ASTM F-75 cobalt alloy. This surface condition was compared with a borided and an untreated ASTM F-75 cobalt alloy. Surfaces were characterized using scanning electron microscopy (SEM) with energy dispersive spectroscopy, X-ray diffraction, and nanoindentation test. The tribological response was studied by means of a ball-on-disc tribometer under dry-sliding conditions tracking the coefficient of friction, volume loss, wear rate, and surface damage by stereoscopy, profilometry, optical 3D measurements, and SEM. Duplex coating increased the wear resistance 7 times relative to the wear resistance of the untreated sample, and 1.5 times relative to the borided sample.

中文翻译：

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在 ASTM F-75 钴合金上合成的双相涂层（硼化 + 溅射沉积 AlCrON）的表征

摘要 金属生物材料由于其优异的机械性能而被广泛应用。钴铬钼合金尤其是用于制造矫形假肢的最安全合金之一。然而，由于不利的生物反应，磨损导致的金属离子的释放已成为一个问题。因此，通过热化学处理和陶瓷涂层进行的表面改性可用于改善合金的摩擦学性能。在这项工作中，在 ASTM F-75 钴合金上合成了通过硼化热化学处理获得的双相涂层加上通过物理气相沉积产生的铝铬氮氧化物涂层。将该表面状况与硼化和未处理的 ASTM F-75 钴合金进行比较。使用具有能量色散光谱、X 射线衍射和纳米压痕测试的扫描电子显微镜 (SEM) 表征表面。在干滑动条件下，通过球盘摩擦计研究摩擦学响应，通过立体镜、轮廓测量、光学 3D 测量和 SEM 跟踪摩擦系数、体积损失、磨损率和表面损伤。双相涂层的耐磨性是未处理样品的 7 倍，是硼化样品的 1.5 倍。光学 3D 测量和 SEM。双相涂层的耐磨性是未处理样品的 7 倍，是硼化样品的 1.5 倍。光学 3D 测量和 SEM。双相涂层的耐磨性是未处理样品的 7 倍，是硼化样品的 1.5 倍。