The tribo-mechanical properties of NiMoAl-Cr2AlC MAX phase composite coatings on stainless steel substrate have been investigated. NiMoAl with different amounts of Cr2AlC (10, 20, 50 and 100 wt.%) were prepared by turbo-mixing and deposited by High-Velocity Oxy-Fuel (HVOF) method on stainless steel substrate. The phase composition, microstructure, chemical composition, tribological and mechanical properties of the coatings were analyzed using x-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy-Dispersive x-ray analysis (EDAX), pin-on-disk wear testing rig and nanohardness tester, respectively. The worn surfaces were analyzed by metallurgical optical microscope, FESEM and three-dimensional surface profiler to understand the wear behavior in detail. The addition of the Cr2AlC MAX phase in NiMoAl enhances the mechanical properties and reduces the surface roughness and porosity. NiMoAl-20 wt.% Cr2AlC and Cr2AlC coatings containing equal amounts of oxygen and carbon in the tribofilm show the low coefficient of friction (COF) and wear rate. The addition of the Cr2AlC MAX phase in the NiMoAl matrix up to 20 wt.% reduces the wear rate by one order of magnitude and enhances the coating life by 7000 twist fatigue cycles.

中文翻译：

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HVOF喷涂NiMoAl-Cr2AlC复合涂层的摩擦力学性能

研究了不锈钢基体上NiMoAl-Cr2AlC MAX 相复合涂层的摩擦力学性能。NiMoAl 与不同量的 Cr2AlC（10、20、50 和 100 wt.%）通过涡轮混合制备，并通过高速氧燃料（HVOF）方法沉积在不锈钢基材上。使用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、能量色散X射线分析（EDAX）、pin-on分析涂层的相组成、微观结构、化学成分、摩擦学和机械性能。 -磁盘磨损试验台和纳米硬度试验机，分别。通过金相光学显微镜、FESEM和三维表面轮廓仪对磨损表面进行分析，以详细了解磨损行为。在 NiMoAl 中添加 Cr2AlC MAX 相提高了机械性能并降低了表面粗糙度和孔隙率。NiMoAl-20 wt.% Cr2AlC 和 Cr2AlC 涂层在摩擦膜中含有等量的氧和碳，显示出低摩擦系数 (COF) 和磨损率。在 NiMoAl 基体中添加高达 20 wt.% 的 Cr2AlC MAX 相可将磨损率降低一个数量级，并将涂层寿命提高 7000 次扭转疲劳循环。