Mathematical prediction of the probability of particle collisions during detonation spraying

The paper presents methods of mathematical prediction of the probability of collision of particles of dissimilar materials in the process of detonation spraying of composite coatings. As a consequence of different properties of initial powder materials (mass, aerodynamic resistance), quality indicators of composite coatings are determined not only with the motion parameters of the particles but with their mutual position in the flow of the detonation products. In the case of the use of reactive components, the interaction of molten particles in the flow can lead to chemical reactions, formation of new materials on the substrate, heterogeneous structure of the coating, and deterioration of its strength and adhesive properties. A preliminary forecast of the probability of collision of particles before contact with the surface of the product makes it possible to conclude before conducting full-scale tests that high-quality coating indicators have been obtained.