PROCESS FOR PRODUCTION OF METAL BALL

摘要

Disclosed is a process for producing a metal ball, which comprises the steps of: providing a predetermined mass of a raw material piece; making a plasma flame by a high-frequency energy generated from a plasma working gas and a high-frequency induction coil and increasing the nitrogen concentration in a plasma generation space to 2 vol% or more; introducing the raw material piece into the plasma flame to melt the raw material piece and spheroidizing the molten product; and solidifying the molten and speroidized raw material. Nitrogen can be introduced into the metal ball through the speroidizing step and the solidifying step.