Methods of metal powders production

Powder Production by Electro-Pulse Atomisation
of Melt (EPAM)

The electropulse atomisation of melts (EPAM) is intended for obtaining powders and pellets from reactive metals and alloys. This method has advantages of a method of melt atomisation by inert gases (high efficiency, obtaining of pure powders, etc.) and also allows to reduce the cost of powders due to application for a dispersion of cheap and accessible electrical energy. The method is the impulse current from a pulsing oscillator is skipped through a jet of molten metal . The electromagnetic and thermal processes in jet causes division of it on drops, which derivate powder and pellets during solidification.

The method has two design versions of implementation:

On the first version (figure 1): in a crucible 1 with molten metal 2 immerse an electrode 3. Metal is let out as a jet 5 on other electrode 6. Both electrodes are connected to the special generator of electric pulses 4, the supply of last ones on a jet is synchronized with short circuit by molten metal of an interelectrode interspace.

On the second version (the figure 2): between the refractory tube 6 and the hole of the crucible is shaped a hollow jet 7. The electromagnetic (pushed aside) interaction of a current in jet and electrode results in crushing of a melt on drops.

EPAM allows to receive pure powders and pellets dimensioned of particles 100-500 microns and also powdery oxides of metals with the sizes of particles 0,01- 30 microns.

figure 1
figure 2