welding generation of wear protection coatings for high temperature applications

硬相的尺寸、形状和取向统计分布对硬质合金的耐磨性有重要影响。在颗粒状材料的冲击下，硬相之间的间距必须小于磨料的平均粒径。因此，将硬相嵌入到相对矩阵中。建立了适用于室温的伪合金。该项目的目标是生成和鉴定用于高温应用的伪合金。采用镍基和钴基高合金和耐高温合金。这些合金用不同的硬相进行强化。焊接研究将采用pta工艺进行，因为这种焊接工艺在硬相的可加工量和伪合金的能量管理方面具有必要的可变性。焊接合金的特点是具有高达800°C工作温度的磨料和侵蚀磨损试验。随着温度的升高，与显微组织和硬相组成相关的磨损机制的变化将是一个主要的焦点。

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.