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Project manager: Prof. Dr.-Ing. Wesling
Funding period: 03/2015 - 02/2017
Funding body: DFG
The statistical distribution of the hard material phases according to size, shape and arrangement has a significant influence on the wear resistance of hard alloys. For example, when attacking granular materials, it is necessary for the line spacing of the hard phases to be smaller than the average diameter of the abrasive particles. In this case, the hard phases are embedded in a comparatively soft matrix. Pseudo-alloys for applications at room temperature are now well established.
The aim of the project is to produce and qualify pseudo-alloys for high-temperature applications. For this purpose, high-alloyed and high-temperature resistant alloys based on Ni and Co are used as matrix material and reinforced with different hard materials of different types. The PPA process is used for the welding investigations, as it offers the necessary variability, particularly with regard to processable hard material content and energy management, for welding pseudo-alloys. The alloys produced in this way are characterized by means of abrasion and erosion wear tests up to an application temperature of 800°C. Of particular interest here are the changes in the erosion mechanisms in correlation with the microstructure morphology and phase composition at increasing temperatures.