Welding generation of wear-resistant coatings for high-temperature applications

Project manager: Prof. Dr.-Ing. V. Wesling

Funding period: 03/2015 - 02/2017 Funding agency: DFG

Significant influence on the wear resistance of hard alloys has the statistical distribution of the hard material phases according to size, shape and arrangement. Thus, in the case of attack of granular materials, it is necessary that the line spacing of the hard phases is smaller than the average diameter of the abrasive particles. In this case, the hard phases are embedded in a comparatively soft matrix. Pseudoalloys for room temperature applications are now well established.

The aim of the project is to produce and qualify pseudoalloys for high-temperature applications. For this purpose, high-alloy and high-temperature resistant Ni- and Co-based alloys are used as matrix material and reinforced with various foreign hard materials. The PPA process is used for the welding investigations, since it exhibits the necessary variability, particularly with regard to workable 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 a feed temperature of 800°C. The changes in the hardness of the alloys are of particular interest here. Of particular interest here are the changes in the erosion mechanisms in correlation to the microstructure morphology and phase composition at increasing temperatures.