Specialized metallurgical processes – compositions for use therei – Processes – Producing solid particulate free metal directly from liquid...
Patent
1995-05-16
1997-08-12
Wyszomierski, George
Specialized metallurgical processes, compositions for use therei
Processes
Producing solid particulate free metal directly from liquid...
75338, B22F 908
Patent
active
056560613
ABSTRACT:
Close-coupled atomization methods employing non-axisymmetric fluid flow geometries have demonstrated superior efficiency in the production of fine superalloy powder, such as, for example, nickel base superalloys compared to conventional close-coupled atomization utilizing an axisymmetric gas orifice and an axisymmetric melt nozzle. It is believed that the principal physical mechanisms leading to non-axisymmetric atomization system fine powder yield improvement are atomization plume spreading, the at least lessening of the melt pinch down at the interaction point between the atomization liquid and the liquid melt and improved melt film formation at the melt guide tube tip. The greatest fine powder yield improvement occurred when the non-axisymmetric atomization systems are operated with atomization parameters that result in the formation of multiple atomization plumes. Recognition of the atomization plume characteristics ranging from pinch-down to spreading to multiple sub-plume formation provides a basis for atomization process control to provide the greatest fine powder yield improvement verses conventional close-coupled axisymmetric atomization systems.
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Miller Russell Scott
Miller Steven Alfred
General Electric Company
Pittman William H.
Wyszomierski George
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