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Stability of gas atomized reactive powders through multiple step in-situ passivation

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A method for gas atomization of oxygen-reactive reactive metals and alloys wherein the atomized particles are exposed as they solidify and cool in a very short time to multiple gaseous reactive agents for the in-situ formation of a protective reaction film on the atomized particles. The present invention is especially useful for making highly pyrophoric reactive metal or alloy atomized powders, such as atomized magnesium and magnesium alloy powders. The gaseous reactive species (agents) are introduced into the atomization spray chamber at locations downstream of a gas atomizing nozzle as determined by the desired powder or particle temperature for the reactions and the desired thickness of the reaction film.
Anderson, Iver E. (Ames, IA), Steinmetz, Andrew D. (Peoria, IA), Byrd, David J. (Boone, IA)
Iowa State University Research Foundation, Inc.
13/ 986,193
April 10, 2013
CONTRACTUAL ORIGIN OF THE INVENTION [0002] The United States Government has rights in this invention pursuant to Contract No. DE-AC02-07CH11358 between the U.S. Department of Energy and Iowa State University.