Investigations on the application of metal containing DLC-coatings as wear protection systems for forging dies

在本研究项目中，重点研究了用于热锻工具磨损保护系统的dlc涂层的进一步开发。可以证明，掺杂dlc涂层可以显著提高涂层的热稳定性。因此，dlc涂层可以降低热成形刀具的磨损。在进行的初步调查中发现，掺杂含有金属成分的dlc涂层可以增加热稳定性，到目前为止，在热锻造过程中的应用是可能的。在提议的项目中，不同的含金属碳体系（a-C:H:Me-DLC），包括有和没有粘合剂层（例如CrN），将沉积在氮化测试基板上。将对层的性能进行基本表征，并为后续在实际条件下的热锻测试选择变体。确定摩擦因素，分析不同热锻工艺下的磨损情况。在计划的热锻实验中，将对涂层进行基本分析。这是必要的，以便在没有工业环境测试的情况下对涂层系统的可能适用性进行全面评估。为此，采用了三种完全不同的锻造工艺，采用了不同的锻造工艺、载荷类型和圆环压缩试验来确定摩擦因数。模具加载了规定的锻造循环，并以精细的测量水平研究了由此产生的磨损机理。基于非破坏性和破坏性分析方法，可以详细确定当前的磨损机制。

Within this research project a further development of DLC-coatings for the application as wear protection systems for hot forging tools is focused. It could have been proved already, that doping of DLC-coatings could increase the thermal stability significantly. Thus, the wear of tools for warm forming could be decreased by DLC-coating. Within performed preliminary investigations it was found out, that doping of DLC-coatings with metal containing components could increase the thermal stability so far that an application in hot forging processes is possible.In the proposed project different metal-containing carbon systems (a-C:H:Me-DLC) both with and without adhesive layer (eg CrN) will be deposited on nitrided test substrates. The layer properties will be characterized fundamentally and a selection of variants for subsequent testing under real conditions for hot forging will be made. Friction factors will be identified and the wear will be analyzed under different hot forging processes.In the planned hot forging experiments a fundamental analysis of the coatings will be carried out. This is necessary in order to carry out a comprehensive assessment of the possible suitability of coating systems without testing in an industrial context. For this purpose, three totally different forging processes with different forging processes load types and ring compression tests to determine friction factors are used. The dies are loaded with defined forging cycles and the resulting wear mechanisms are investigated with a fine measurement level. Based on non-destructive and destructive analyze methods, a detailed determination of the present wear mechanisms is possible.