Progress toward gas atomization processing with increased uniformity and control

摘要: Abstract Many advanced technologies based on particulate materials demand the availability of fine spherical powders or a narrow particle size class. Generally, high-pressure gas atomization (HPGA) is close-coupled discrete jet method and one most effective methods producing such powders. Development HPGA nozzles with jets resembling convergent–divergent (C–D) rocket nozzle designs, instead previous cylindrical jets, was conducted to increase efficiency uniformity reduce required supply pressures. Results compressible flow measurements both types revealed steadily increasing trend mass pressure positive deviation from isentropic behavior that increases for pressure. This has been attributed an insufficient volume in manifold experiences enhanced expansion cooling at In experiments 316L stainless steel, C–D higher than reflecting lower gas/metal ratio. other words, while powder distributions were nearly same all experiments, utilized significantly reduced operating rate.