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Title: Apparatus for making environmentally stable reactive alloy powders

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:
OSTI Identifier:
870758
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA) AMES
Patent Number(s):
US 5589199
Application Number:
08/328,115
Contract Number:
W-7405-ENG-82
Research Org:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
Country of Publication:
United States
Language:
English
Subject:
apparatus; environmentally; stable; reactive; alloy; powders; method; 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; /425/75/266/427/