High-Velocity Collision of Hot Particles with Solid Substrate under Detonation Spraying: Detonation Splats

Abstract

The aim of this study is to analyze the shape of splats deposited by detonation spraying and correlate splat morphology with the velocity and temperature of particles as they hit the substrate. The obtained results are in good agreement with numerical calculations for nickel splats and show that the thermo-physical properties of composite particles can be estimated from their splat characteristics as well. An understanding of these relationships for various materials is necessary to calculate particle heating in the detonation barrel.

Technology vision

“…Experiments with the splat formation are compared with calculations of the particle temperature at impact 7. It was shown that, in DS, particles with temperature 15–20% below the melting point are strongly fixed on a flat substrate, as in cold spraying.…”

“…6 Experiments with the splat formation are compared with calculations of the particle temperature at impact. 7 It was shown that, in DS, particles with temperature 15-20% below the melting point are strongly fixed on a flat substrate, as in cold spraying. On the other hand, particle overheating by 30-50% above the melting point results in droplet sputtering and splat cracking.…”