Spray Deposition: A Fundamental Study of Droplet Impingement, Spreading and Consolidation
Abstract
Net or near net shape products can be manufactured by technologies involving solidification processing, metal forming, particle processing, and droplet consolidation. One example of droplet consolidation is spray deposition in the Osprey mode. In this process, a stream of liquid metal is atomized by an inert gas to form a spray of molten droplets; these are accelerated towards a substrate where they impinge and consolidate. Mathematical models have been developed to describe droplet-gas interactions in flight and droplet behavior on impact with the substrate. The models predict droplet velocity and temperature as a function of flight distance, the extent of droplet solidification on arrival at the substrate, and temperature distribution in the consolidated material during deposition. Measured values of droplet velocity, the progress of droplet solidification, and attendant temperature profiles after consolidation on the substrate substantiate teh integrity of the models. This approach demonstrates the utility of modeling studies in order to establish quantitive guidelines for optimization of the process in terms of the evolution of microstructure in droplet consolidation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1987
- Accession Number
- ADA186627
Entities
People
- Alan Lawłey
- D. Apelian
- G. Gillen
- P. Mathur
Organizations
- Drexel University