Abstract
The set of input parameters includes features of carrier gas, sprayed material, and energetic features of power source. To study the input parameters, it is rational to divide the process of AS into several stages. They include electrode end face, arc burning zone, spraying distance, and coating formation. Carrier gas parameters include velocity, temperature, and chemical content. Their change due to passing through the arc was evaluated. Metal heating and melting of the electrode on the end face for AS were evaluated both for solid wire and for core wire. It allows calculating the layer thickness of the liquid metal being broken away during AS for the solid wire and CW with different thickness of wire shell. This in turn shows a mass of liquid metal, which is separated from the end face by carrier gas. These data are used in a subsequent study. Aside from gas-dynamic pressure, the electromagnetic force is generated when electrical current is passing through the wire electrodes, the liquid metal layer on the ends of the electrodes, and the electric arc strongly effect droplets. They allow fracturing the droplet of diameter less than a critical one. Studying of droplet formation features enables to specify the initial conditions for the droplet motion for the subsequent steps, on spraying distance. Validated models of AS processes are introduced. They include the following: Description of the geometry and the velocity of two-phase flow; Temperature calculation of the two-phase flow; Chemical composition of the gas jet; Kinetic of interaction of the sprayed metal with oxygen. The latter one is accompanied by calculating oxygen delivery to a drop in case of iron-based solid wire.
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Boronenkov, V., Korobov, Y. (2016). Input Parameters of the Coating Process. In: Fundamentals of Arc Spraying. Springer, Cham. https://doi.org/10.1007/978-3-319-22306-3_2
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