Stability of gas atomized reactive powders through multiple step in-situ passivation
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United States of America Patent
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Apr 14, 2020
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Oct 26, 2017
app pub date -
Apr 24, 2017
filing date -
Apr 12, 2012
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Abstract
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.
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