Meaning
Centrifugal atomization represents a highly specialized method for producing high-purity metal powders. Specifically, the plasma rotating electrode process uses a rapidly spinning metal bar that is melted at its tip by a plasma torch. This technique governs the manufacture of spherical titanium and superalloy powders, but it does not apply to non-conductive materials that cannot act as electrodes.
It is primarily utilized when contamination from ceramic crucibles must be avoided during powder production.
Centrifugal Operation
Rotational speeds exceeding ten thousand revolutions per minute drive the molten material outward. In the plasma rotating electrode process, the liquid metal is flung off the tip of the electrode as fine droplets. These droplets then solidify in an inert gas chamber before collection.
Yield Quality
Spherical morphology and low internal porosity characterize the powder produced by this method. Unlike gas atomization, the plasma rotating electrode process avoids gas entrapment because no high-velocity gas streams are used for atomization. This results in powders with high packing density.
Economic Viability
High capital cost of the machinery limits its use to high-value applications. Because the feed material must be machined into precise rods, the plasma rotating electrode process is more expensive than conventional atomization. It remains favored for aerospace and medical implant manufacturing.
