Environmentally stable reactive alloy powders and method of making same
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.
- Research Organization:
- Iowa State Univ., Ames, IA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of Commerce, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- Assignee:
- Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
- Patent Number(s):
- US 5,811,187/A/
- Application Number:
- PAN: 8-667,485; CNN: Grant ITA 87-02
- OSTI ID:
- 672632
- Resource Relation:
- Other Information: PBD: 22 Sep 1998
- Country of Publication:
- United States
- Language:
- English
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Apparatus for making environmentally stable reactive alloy powders
Apparatus for making environmentally stable reactive alloy powders