Abstract Cr-doped amorphous carbon (a-C:Cr) film is a promising protective coating to extend the lifetime of Co-Cr-Mo implants. Here, a-C:Cr films with the same doping concentration of Cr and thickness are deposited on Co-Cr-Mo substrates using the closed-field unbalanced magnetron sputtering (UBMS) and the plasma-enhanced chemical vapor deposition (PECVD) methods. A comparative study on the microstructure, bio-tribological behavior, and cytocompatibility of two kinds of a-C:Cr films in the air and different simulated body fluids is conducted. Microstructural analysis results show that the a-C:Cr films prepared by UBMS and PECVD methods belong to graphite-like carbon (GLC) and diamond-like carbon (DLC) films, respectively. Nanohardness of the UBMS a-C:Cr film is found to be lower than that of the PECVD counterpart. However, the UBMS a-C:Cr film exhibits better lubrication, lower wear depth and lower wear volume under all the three simulated body fluids, because of the slight polishing wear and boundary lubrication mechanisms. Moreover, both kinds of a-C:Cr films significantly improve the cytocompatibility of Co-Cr-Mo substrate alloy.

中文翻译：

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Co-Cr-Mo人工腰椎间盘用Cr掺杂非晶碳膜的显微结构、生物摩擦学和细胞相容性比较研究

摘要 Cr 掺杂的非晶碳 (aC:Cr) 薄膜是一种很有前途的保护涂层，可延长 Co-Cr-Mo 植入物的使用寿命。在这里，使用闭场不平衡磁控溅射 (UBMS) 和等离子体增强化学气相沉积 (PECVD) 方法在 Co-Cr-Mo 基板上沉积具有相同 Cr 掺杂浓度和厚度的 aC:Cr 薄膜。对两种aC:Cr薄膜在空气和不同模拟体液中的微观结构、生物摩擦学行为和细胞相容性进行了比较研究。微观结构分析结果表明，UBMS和PECVD方法制备的aC:Cr薄膜分别属于类石墨碳（GLC）和类金刚石碳（DLC）薄膜。UBMS aC:Cr 薄膜的纳米硬度低于 PECVD 对应物的纳米硬度。然而，UBMS aC：由于轻微的抛光磨损和边界润滑机制，Cr 膜在所有三种模拟体液下都表现出更好的润滑性、更低的磨损深度和更低的磨损量。此外，两种 aC:Cr 薄膜显着提高了 Co-Cr-Mo 基体合金的细胞相容性。