The Assessment of the Collision Probability of Particles in the Process of Detonation Spraying

Abstract

The article discusses a technique for assessing the collision probability of particles of dissimilar materials in the process of detonation spraying of composite coatings. In consequence of different properties of initial powder materials (mass, aerodynamic resistance), quality indicators of composite coatings are determined not only with motion parameters of particles but with their mutual position in the flow of detonation products. In the case of using reactive components, interaction of molten particles in the flow can lead to chemical reactions, formation new materials on the substrate, heterogeneous structure of the coating, and deterioration its strength and adhesive properties. Preliminary quantitative assessment of the probability of collision of particles before their contact with the surface of the product affords to make a conclusion about deviation of quantitative indicators of the surface from supposed ones before full-scale tests.