Abstract
Fluid flow behaviour during ultrasonic gas atomization was studied. The gas velocity was determined by total pressure measurement and Schlieren photography, and the metal powder particle velocity was calculated. The gas velocity reaches about 1700 m s −1 (Mach. 1.7) in the supersonic flow region for helium gas at a backing pressure of 6.9 M Pa. An Al5wt.%Mn2.5wt.%Cr powder particle 15 μm in diameter is accelerated to a maximum velocity of about 1200 m s −1, while a particle 150 μm in diameter of the same alloy reaches a maximum velocity of about 400 m s −1. Solidification studies were carried out by collecting powder particles at different flight distances from the atomization nozzle. A comparison between a theoretical solidification model and the experimental result shows good agreement.
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