Factors affecting morphology and geometry of Arc-PVD coatings on complex part geometries

由于等离子体中的高度电离，在偏压作用下，电弧-PVD涂层的微观结构和形貌会发生很大的变化。在平面基板上，这种可变性为涂层性能改进提供了有利的工具箱。然而，对于复杂的衬底，如铣刀，电场密度的几何相关性导致涂层结构和性能的局部变化。特别锋利的边缘往往是圆形的，这在实际应用中造成了问题，因为这会导致工具不那么锋利。为了保持涂层后刀具的锋利，昂贵的涂层后机械处理是必要的。该项目的目的是深入了解几何相关的物理和化学效应、所得涂层的微观结构和几何及其性能之间的相互作用。研究结果将为基于知识的复杂成分沉积过程中涂层的几何形状和性能调整奠定基础。

Due to the high degree of ionization in the plasma, microstructure and morphology of Arc-PVD coatings can be widely varied when bias voltages are used. On flat substrates this variability offers an advantageous toolbox for coating property modifications. However, for complex substrates, such as milling tools, the geometry dependence of electrical field density leads to local variations in coating structures and properties. Particularly sharp edges tend to be rounded, causing problems in practical applications since leading to less sharp tools. Costly post-coating mechanical treatments are necessary to maintain tool sharpness after coating.The aim of the project is an in-depth understanding of the interplay between geometry-dependent physical and chemical effects, microstructure and geometry of the resulting coatings and their properties. The scientific results will lay the foundation for knowledge-based geometry and property adjustment of coatings during deposition for complex component geometries.