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Title: Apparatus for making environmentally stable reactive alloy powders

Apparatus and method are disclosed 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. 7 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
415719
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; SCA: 360101; PA: EDB-97:014559; SN: 97001714589
Patent Number(s):
US 5,589,199/A/
Application Number:
PAN: 8-328,115
Contract Number:
W-7405-ENG-82
Resource Relation:
Other Information: PBD: 31 Dec 1996
Research Org:
Iowa State University
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CHEMICAL VAPOR DEPOSITION; LIQUID METALS; ATOMIZATION; POWDER METALLURGY; PROTECTIVE COATINGS; CORROSION PROTECTION