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

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.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1357554
Assignee:
Iowa State University Research Foundation, Inc. AMES
Patent Number(s):
9,650,309
Application Number:
13/986,193
Contract Number:
AC02-07CH11358
Resource Relation:
Patent File Date: 2013 Apr 10
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Other works cited in this record:

Method for Inhibiting the Oxidation of Readily Oxidizable Metals
patent, September 1934

Electric arc spraying of reactive metals
patent, February 1991

Atomizing nozzle and process
patent, June 1992

Gas atomization synthesis of refractory or intermetallic compounds and supersaturated solid solutions
patent, November 1994

Method of making environmentally stable reactive alloy powders
patent, December 1994

Apparatus for making environmentally stable reactive alloy powders
patent, December 1996

Environmentally stable reactive alloy powders and method of making same
patent, September 1998

Atomizing apparatus for making polymer and metal powders and whiskers
patent, March 2003

Characterisation of protective surface films formed on molten magnesium protected by air/SF6 atmospheres
journal, February 2002

Characterisation of the surface films formed on molten magnesium in different protective atmospheres
journal, July 2002
  • Pettersen, Gunnar; Øvrelid, E.; Tranell, G.
  • Materials Science and Engineering: A, Vol. 332, Issue 1-2, p. 285-294
  • DOI: 10.1016/S0921-5093(01)01750-6

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journal, June 2011

The Oxidation and Evaporation of Magnesium at Temperatures from 400° to 500° C
journal, January 1945
  • Gulbransen, Earl A.
  • Transactions of The Electrochemical Society, Vol. 87, Issue 1, p. 589-599
  • DOI: 10.1149/1.3071667

The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride
journal, February 2002

Protection behavior of fluorine-containing cover gases on molten magnesium alloys
journal, July 2010
  • Xiong, Shou-mei; Wang, Xian-fei
  • Transactions of Nonferrous Metals Society of China, Vol. 20, Issue 7, p. 1228-1234
  • DOI: 10.1016/S1003-6326(09)60283-1

Highly tuned gas atomization for controlled preparation of coarse powder. Hochleistungsgasverdüsung für die gezielte Präparation grober Pulver
journal, July 2010
  • Anderson, I. E.; Byrd, D.; Meyer, J.
  • Materialwissenschaft und Werkstofftechnik, Vol. 41, Issue 7, p. 504-512
  • DOI: 10.1002/mawe.201000636

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