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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.
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