Methods of close-coupled atomization of metals utilizing non-axi

Details Methods of close-coupled atomization of metals utilizing non-axi Methods of close-coupled atomization of metals utilizing non-axi

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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