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

Abstract

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 alloys 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:
Research Org.:
Iowa State Univ., Ames, IA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Department of Commerce, Washington, DC (United States)
OSTI Identifier:
672632
Patent Number(s):
5811187
Application Number:
PAN: 8-667,485; CNN: Grant ITA 87-02
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 22 Sep 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LIQUID METALS; ATOMIZATION; DROPLETS; SURFACE COATING; REFRACTORIES; PROTECTIVE COATINGS; CORROSION PROTECTION

Citation Formats

Anderson, I E, Lograsso, B K, and Terpstra, R L. Environmentally stable reactive alloy powders and method of making same. United States: N. p., 1998. Web.
Anderson, I E, Lograsso, B K, & Terpstra, R L. Environmentally stable reactive alloy powders and method of making same. United States.
Anderson, I E, Lograsso, B K, and Terpstra, R L. Tue . "Environmentally stable reactive alloy powders and method of making same". United States.
@article{osti_672632,
title = {Environmentally stable reactive alloy powders and method of making same},
author = {Anderson, I E and Lograsso, B K and Terpstra, R L},
abstractNote = {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 alloys 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}