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Numerical simulation of the continuous strip coating process
The coating of bearing material, here a layer of bronze on a steel substrate, with a thin AlPb-layer on top, is investigated by numerical simulation. The monotectic alloy AlPb has to be rapidly solidified in order to get a finely dispersed microstructure. For the adherence of the AlPb-coating it is necessary to guarantee a definite contact-temperature and -time between the liquid and the base material. In order to achieve the desired solidification parameters both the geometry of the coating device, and the process parameters strip velocity and preheating temperatures of strip and melt are to be optimized. Numerical simulation is used accompanying the construction of a pilot plant. The simulation is done in a 2-D-cut in the direction of transport. The flow pattern inside the coating device and the film forming meniscus is calculated coupled to the temperature field of the melt, the coating device and the strip. The flow field is driven by the moving strip, while natural convection can be neglected due to the high velocity of the process.