Modelling of two-phase stream fluxion at thermal spray coating

S.V. Sergeyev, K.A. Danko

Process of acceleration of a powdered material in the supersonic nozzle of a gas-flame gun for thermal spray coating and in space between a shearing of a nozzle and the workpiece is observed. The analysis purpose is dependence determination between a size of a particles phase of a two-phase stream and distribution of a thickness of a put coating in a cross-section. The basic attention is given a question of definition of the minimum size of particles which are capable to generate a coating on a processed surface. Necessary conditions of formation of the joint between a particle and substrate been defined. The FEM analysis of gas kinetics of two-phase stream and is probability -statistical methods of the analysis of the data is in-process applied. The minimum size of particles at which there is a coating formation is observed.

Key words: thermal spray coating, a two-phase stream, the supersonic nozzle, a kinetic energy, finite elements method, the aviation gas-turbine engine.