This paper describes a coating process, called internal centrifugal projection coating, in which rotating additive materials and substrate surfaces are melted by an electron beam to facilitate adhesion. It explains that the process was developed mainly to apply coatings inside engine bores and examines the microstructure of a molybdenum coating centrifugally projected onto an aluminum substrate. Paper includes a German-language abstract.

A high speed thermoanalytical method has been developed to determine the thermophysical properties of the powders used in thermal spraying. This method is based on heating the powder by means of an electron- or photon-beam in vessels made of materials with excellent heat conductivity. By comparing heating and melting behavior of powders with similar composition but different particle sizes and shapes, their properties can be determined. The suggested high speed thermoanalytical method makes it possible to investigate the heating and melting behavior of spray powders under high speed heating conditions. The results of the experiments, elaborated by this method can be used for further modeling work. Paper text in German.

Alloying of the melt with nitrogen in order to improve material properties is well known in steel-making. This effect can also be used in plasma-powder-welding for a distinct improvement of corrosion- and wear-resistance. Using alloys comparable to material numbers 1.4016 and 1.4404 the influence of the process parameters in plasma-powder-welding on the proportion of nitrogen in the cladding is shown. In addition recommendations are made for the regulation of nitrogen concentrations, that are located far above saturation concentration of the alloys mentioned above. With the recommended parameters it was for the first time achieved to succesfully produce claddings with a nitrogen percentage by weight of up to 0.85 at a partial pressure between 0.045 and 0.065 MPa that allow reproducibility. Paper text in German.