Patent ID: 6481638
Filing Date: 2002-11-19
Classification: B22F,B29B

Abstract:
A method of producing fine powder, by atomizing molten material with gas, including the steps of:causing molten material to flow, in a form of a film, out of a molten material nozzle having an essentially rectangular discharge cross-sectional area; and thereafter causing said molten material, together with an atomizing gas, to flow through an initially converging and then diverging gas nozzle that is in the form of a linear Laval nozzle, has an essentially rectangular cross-sectional area, and through which flow is laminar, whereby a laminar accelerated gas flow stabilizes and simultaneously stretches said film of molten material in the converging portion of said Laval nozzle until said film of molten material, after passing a narrowest cross-sectional area of said Laval nozzle, is uniformly atomized over an entire length thereof.