Spherical powder and preparation method therefor

A method for preparing a spherical powder, comprising the following steps:

• placing an electrode and a workpiece at two electrodes of a power supply, adjusting a discharging gap between the electrode and the workpiece by a motion control system to generate an arc plasma, when the arc plasma acts on surfaces of the electrode and the workpiece, the surfaces of the electrode and the workpiece are melted to form a melting region, at the same time, introducing a fluid medium into the discharging gap, controlling a flow rate of the fluid medium and a relative rotation speed of the electrode or the workpiece, so as to change a working morphology of the arc plasma, such that an explosion is generated in the melting region, crushing and throwing away a material located in the melting region, condensing the crushed molten material in the fluid medium, and collecting a condensed fine spherical powder;
• wherein the electrode is connected to an anode of the power supply, the power supply drives the electrode to rotate;
• wherein the workpiece is connected to a cathode of the power supply;
• wherein the electrode and the workpiece are each provided with a hollow cavity, the fluid medium is introduced through the hollow cavity of the electrode and the hollow cavity of the workpiece, and a rotation axis of the electrode coincides with an extending direction of the hollow cavity of the workpiece.