Method of making environmentally stable reactive alloy powders

Details Method of making environmentally stable reactive alloy powders Method of making environmentally stable reactive alloy powders

1992-08-05

1994-12-13

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing solid particulate free metal directly from liquid...

75338, 75349, 148217, B22F 908

Patent

active

053726294

ABSTRACT:
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.

REFERENCES:
patent: 4585473 (1986-04-01), Narasimhan et al.
patent: 4801340 (1989-01-01), Inoue
patent: 4837114 (1989-06-01), Hamada et al.
patent: 4882224 (1989-11-01), Moro et al.
patent: 5147448 (1992-09-01), Roberts et al.

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