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Title: Environmentally stable reactive alloy powders and method of making same

Abstract

Apparatus and method for making powder from a metallic melt by atomizing the melt to form droplets and reacting the droplets downstream of the atomizing location with a reactive gas. The droplets are reacted with the gas at a temperature where a solidified exterior surface is formed thereon and where a protective refractory barrier layer (reaction layer) is formed whose penetration into the droplets is limited by the presence of the solidified surface so as to avoid selective reduction of key reactive alloyants needed to achieve desired powder end use properties. The barrier layer protects the reactive powder particles from environmental constituents such as air and water in the liquid or vapor form during subsequent fabrication of the powder to end-use shapes and during use in the intended service environment.

Inventors:
 [1];  [1];  [1]
  1. (Ames, IA)
Issue Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
OSTI Identifier:
871857
Patent Number(s):
5811187
Application Number:
08/667,485
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA) AMES
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
environmentally; stable; reactive; alloy; powders; method; apparatus; powder; metallic; melt; atomizing; form; droplets; reacting; downstream; location; gas; reacted; temperature; solidified; exterior; surface; formed; thereon; protective; refractory; barrier; layer; reaction; penetration; limited; presence; avoid; selective; reduction; key; alloyants; achieve; desired; properties; protects; particles; environmental; constituents; air; water; liquid; vapor; subsequent; fabrication; end-use; shapes; intended; service; environment; atomizing location; achieve desired; alloy powders; selective reduction; reaction layer; metallic melt; reactive gas; alloy powder; barrier layer; powder particles; exterior surface; formed thereon; protective refractory; subsequent fabrication; vapor form; stable reactive; reactive alloy; form droplets; environmentally stable; active powder; droplets downstream; /428/148/

Citation Formats

Anderson, Iver E., Lograsso, Barbara K., and Terpstra, Robert L. Environmentally stable reactive alloy powders and method of making same. United States: N. p., 1998. Web.
Anderson, Iver E., Lograsso, Barbara K., & Terpstra, Robert L. Environmentally stable reactive alloy powders and method of making same. United States.
Anderson, Iver E., Lograsso, Barbara K., and Terpstra, Robert L. Tue . "Environmentally stable reactive alloy powders and method of making same". United States. https://www.osti.gov/servlets/purl/871857.
@article{osti_871857,
title = {Environmentally stable reactive alloy powders and method of making same},
author = {Anderson, Iver E. and Lograsso, Barbara K. and Terpstra, Robert L.},
abstractNote = {Apparatus and method for making powder from a metallic melt by atomizing the melt to form droplets and reacting the droplets downstream of the atomizing location with a reactive gas. The droplets are reacted with the gas at a temperature where a solidified exterior surface is formed thereon and where a protective refractory barrier layer (reaction layer) is formed whose penetration into the droplets is limited by the presence of the solidified surface so as to avoid selective reduction of key reactive alloyants needed to achieve desired powder end use properties. The barrier layer protects the reactive powder particles from environmental constituents such as air and water in the liquid or vapor form during subsequent fabrication of the powder to end-use shapes and during use in the intended service environment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}

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