Abstract
This study investigates cold spray particle velocities achieved at different pressures and particle feed rates using particle image velocimetry (PIV). Particle dispersion and velocity evolution along the jet axis were investigated for several feedstock materials. It was found that average particle velocity decreases with increasing particulate loading. The effect is aggravated at lower pressures, but mainly depends on feedstock material, which implies more complex, volume-fraction related physics playing a role. Velocity distribution and particle dispersion were also found to be influenced by particle feed rate, depending on the material. Increased particle feed rates affect the magnitude and distribution of impact velocity and consequently the efficiency of cold spraying.
