Effect of injection pressure on particle acceleration, dispersion and deposition in cold spray

摘要: Abstract The effect of injection gas pressure on particle acceleration, dispersion and deposition in cold spray process was investigated by both numerical experimental methods. A computational fluid dynamics (CFD) model developed which exactly matches the real nozzle experiment to predict supersonic flow field velocity prior impact. Based simulation results, it is found that significantly affects driving gas. Higher leads higher rate as well powder rate, producing thicker coating substrate. Besides, footprints substrate surface at different pressures were predicted compared with measurements single track width. results indicate particles disperse more widely pressure. In addition, parameter η refers ratio impact critical used evaluate characteristics. With increasing pressure, range have a downward trend, implies deterioration efficiency bonding strength. For purpose validation, copper coatings also experimentally measured pressures, confirms analysis.