Abstract
For enhancing coating quality, the shock tunnel technology is employed to increase impact velocities of particles up to 1,500 m/s for 10-μm solid particles. Based on a parametric study, an experimental facility has been set up at the Shock Wave Laboratory (SWL) of RWTH Aachen University. A calibration of the nozzle flow has been carried out using a Pitot rake. The conditions in the reservoir achieved so far are p 0 = 140 bar and T 0 = 1,800 K. A high-speed schlieren system is set up for flow visualization and also for velocity measurement of visible particles. For fine particles, both LDA and PIV methods are used for particle velocity measurements. The results achieved are in good agreement with a quasi-1D prediction. The quality of a first coating sample of copper on a steel substrate is analyzed which shows a promising improvement. Systematic experiments have to be carried out with different material combinations of coating and substrate, different particle velocities, and temperatures for further evaluation of this technique.
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