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

由于等离子体的高度电离，当施加偏置电压时，电弧- pvd涂层的微观结构和形貌会发生很大的变化。在平面基材上，这种可变性为涂层性能修改提供了有利的工具箱。然而，对于复杂的衬底，如铣削工具，电场密度的几何依赖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的，在实际应用中造成问题，因为导致不太锋利的工具。昂贵的涂层后机械处理是必要的，以保持涂层后刀具的锋利性。该项目的目的是深入了解几何依赖的物理和化学效应、所得涂层的微观结构和几何形状及其性能之间的相互作用。这些科学成果将为复杂几何构件沉积过程中基于知识的几何和涂层性能调整奠定基础。

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.