ABSTRACT
Recently, much attention has been paid to the processes of coating deposition. To control the deposition process, it is necessary to build a model and optimize the process. Usually, the optimization problem is solved individually for a specific equipment for a specific case, by searching for the technological mode of the installation that provides the required characteristics of the coating, and maintaining it at the stage of operation. Since the quality of adhesion of the sprayed particles to the surface depends on their temperature and speed at the moment of contact, the optimal mode provides the maximum speed at a sufficient heating temperature of the particles. The purpose of this study is to test the YuNA thermal imaging system method for controlling the process of plasma-arc spraying. The use of an optical shutter with a nanosecond resolution makes it possible to measure the particle velocity in the range from 10 to 350 m/s with an accuracy that ensures the calculation of the dynamic parameters of particle acceleration and heating in the jet. Models of heating and acceleration of particles in a plasma flow are constructed. The set of experimental data makes it possible to determine the form of the fundamental diagram of a two-phase plasma jet by the value of the particle transfer velocity in the idle mode and the maximum load capacity of the flow, and the construction of the fundamental diagram of interaction during collective motion allows one to choose the optimal deposition mode.
