This paper evaluates two CFD tools for predicting particle speeds and temperatures during atmospheric plasma spraying. The investigation is based on varying two parameters: plasma current and gas flow rate. Although the tools differ in accuracy, both proved to be sufficient for optimizing industrial plasma spraying processes. A comparison of the results with experimental data showed the more advanced tool to be capable of predicting variations in particle characteristics when operating conditions change. Paper includes a German-language abstract.

This paper investigates the effect of laser post-treatment on cladded coatings deposited by different thermal spray methods. A wide range of coatings, including a VPS sprayed alloy, three APS sprayed oxide ceramics, and two composites, are treated with either a CO 2 or pulsed Nd:YAG high-power laser. The microstructure and wear resistance of the layers are examined before and after treatment and the interaction between the laser and material is modeled using Fusion-2D. Paper includes a German-language abstract.

A numerical model of an argon jet exiting a LPPS torch has been developed and validated against enthalpy probe measurements for a slightly overexpanded jet at a chamber pressure of 100 mbar. Visualization of the jet using a CCD camera shows the presence of a small Mach reflection in the first compression-expansion cell with only oblique shock waves in the second cell. This jet topology is also observed in the model results. The images of the enthalpy probe on the axis of the plasma jet reveal that the shock layer, or shock-probe distance, varies according to the axial location of the probe. Shock-probe distance can be as large as 3 mm and should be considered when mapping plasma jets. Paper includes a German-language abstract.