Kinetics of Ceramic Particulate Penetration into Spray Atomized Metallic Dropletat Variable Penetration Depth

摘要

The present study provides insight into the physical interactions that take placewhen an injected ceramic particulate collides with an atomized metallic droplet during spray atomization and deposition processing of particulate reinforced metal matrix composites. A model is developed to predict the extent of penetration for a given particulate velocity, and the critical velocity for complete penetration. In the model, the initial kinetic energy of the injected particulates or the atomized droplets is considered as the driving force for penetration; the change in surface energies and the work done by viscous drag in the droplet melt are considered as the forces resisting penetration. As examples, Al/graphite and Al/SiC systems are analyzed to demonstrate the applicability of the model. The influence of the particulate size and the fraction of solid phase in the atomized droplet on the critical velocity and the penetration depth is also examined. jg.