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Improved Stability of Gas Atomized Reactive Powders Through Multiple Step In-Situ Passivation
Category(s):
For Information, Contact:
Craig Forney
Commercialization Manager, Chemistry and Materials Sciences
515-294-4740
licensing@iastate.edu
Web Published:
6/1/2015
ISURF #
3993
Summary:
Iowa State University and Ames Laboratory researchers have developed a process to passivate magnesium powders through the creation of a protective film

Development Stage:
Description:
Passivation of magnesium using fluorine-containing gases is well known and extensively used in the die casting industry, and a single-step process to create a thin shell containing fluorine is the subject of previous Ames Laboratory patent.  This newest invention describes a process in which fluorine-containing gases are introduced into the atomizer spray chamber following a first reactive species, resulting in a oxy-fluorine rich scale on the surface of the magnesium powder during free-fall of the powders.  Powders produced in this way show reduced flammability versus commercial compositions (ignition temperature of 635°C versus 525°C).

Advantage:
• Increased ductility of film yields better protection than native oxide film.
• Significantly increased onset temperature for ignition reduces flammability hazard during production, handling, transport and storage.
Application:
Passivated magnesium powders for improved safety

References:
Patent Information:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.
Country Serial No. Patent No. Issued Date
United States 13/986,193 9,650,309* 5/16/2017


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