Environmentally stable reactive alloy powders and method of making same

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871857

Anderson, Iver E ^[1]; Lograsso, Barbara K ^[1]; Terpstra, Robert L ^[1]

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1. Ames, IA

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.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• Assignee: Iowa State University Research Foundation, Inc. (Ames, IA)
• Patent Number(s): US 5811187
• Application Number: 08/667,485
• OSTI ID: 871857
• Country of Publication: United States
• Language: English

Related Subjects

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/