welding generation of wear protection coatings for high temperature applications

硬质相的尺寸、形状和取向的统计分布对硬质合金的耐磨性有很大影响。在颗粒材料的冲击下，硬质相之间的间距必须小于磨料的平均颗粒直径。因此，硬质相被嵌入到相对基质中。建立了适用于室温的伪合金。该项目的目标是用于高温应用的伪合金的产生和鉴定。在镍基和钴基上使用高合金和耐高温合金。这些合金由不同的不同硬质相强化。焊接研究将使用PTA工艺进行，因为这种焊接工艺在可加工硬质相的数量和伪合金的能量管理方面具有必要的可变性。焊接合金的特点是在800°C的工作温度下进行磨粒和冲蚀磨损试验。主要的焦点将是与硬质相的显微组织和成分相关的磨损机制在温度升高时的变化。

The statistical distribution of hard phases by size, shape and orientation has a substantial influence to the wear resistance of hard alloys. At attacks of granular materials it is necessary that the space between the hard phases is smaller than the average particle diameter of abrasive. Hereby the hard phases are embedded in a comparatively matrix. Pseudo alloys for applications at room temperature are established. The goal of the project is the generation and qualification of pseudo alloys for high temperature applications. High-alloyed and high-temperature-resistant alloys on Ni- and Co-base are used. These alloys are reinforced with different dissimilar hard phases. The welding investigations will be done with the PTA-process, because this welding procedure has the necessary variability regarding the processible amount of hard phases and energy management for pseudo alloys. The welded alloys are characterized with abrasive and erosive wear tests up to a working temperature of 800°C. A main focus will be the change of wear mechanisms correlated to the microstructure and the composition of the hard phases at increasing temperatures.