Lenzi Veniero, Marques Luís
Center of Physics of Minho and Porto Universities, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
Laboratory of Physics for Materials and Emergent Technologies, LapMET, University of Minho, 4710-057 Braga, Portugal.
Materials (Basel). 2023 Feb 5;16(4):1344. doi: 10.3390/ma16041344.
Silver-ceramic nanocomposite coatings, such as TiN:Ag, are among the most interesting solutions to improve the machining and cutting process of hard-to-cut Ti alloys, since they combine the TiN matrix hardness with the lubricating and protective action of Ag nanoparticles. Therefore, it is important to understand how, when present, Ag distributes at the tool-workpiece interface and how it affects the tribolayer formation and the tool wear. Molecular dynamics simulation results, obtained using a MEAM-based force field, are presented here for the cutting process of a Ti workpiece with a TiN tool, with and without the presence of Ag at the interface, for different cutting speeds. Ag is shown to form a thin protective layer at the workpiece-tool interface that prevents a direct contact between the parts and greatly reduces the tool degradation. Our simulations confirm the importance of Ag in self-lubricating nanocomposite coatings to realize the machining of otherwise hard-to-cut materials.
银-陶瓷纳米复合涂层，如TiN:Ag，是改善难切削钛合金加工和切削过程的最具吸引力的解决方案之一，因为它们将TiN基体硬度与Ag纳米颗粒的润滑和保护作用结合在一起。因此，了解Ag在存在时如何分布在刀具-工件界面以及它如何影响摩擦层形成和刀具磨损非常重要。这里展示了使用基于MEAM的力场获得的分子动力学模拟结果，用于在不同切削速度下，有和没有界面处Ag的情况下，TiN刀具切削Ti工件的过程。结果表明，Ag在工件-刀具界面形成了一层薄的保护层，防止部件之间直接接触，并大大减少了刀具磨损。我们的模拟证实了Ag在自润滑纳米复合涂层中对于实现难切削材料加工的重要性。
