The invention discloses a method and device for preparing spherical
metal powder. According to the method, a direct-current
plasma arc is used for heating and melting and atomizing a
metal wire, an auxiliary power source is directly applied to the
metal wire, a main power source and the auxiliary power source are insulated, the auxiliary power source carries out resistance heating on the wire, andheating power needed by wire melting and atomizing can be greatly reduced. The invention further discloses the device using the method for preparing the spherical
metal powder. The device comprises apowdering pipeline, a power source including the main power source and the auxiliary power source, a
plasma spraying gun, an insulation mechanism, a wire feeding device, a
powder flying pipeline, a
powder collecting cylinder. A spraying gun
cathode is connected with a negative
electrode of the main power source, a through hole is formed in the front end of an
anode, the insulation mechanism comprises an insulation
gasket on the front end of an
anode nozzle and an insulation
ceramic wire guide
nozzle on the front end of a wire feeding pipeline, the wire feeding device is arranged in a seal binand is provided with the wire feeding pipeline connected with a spraying gun, and the powder collecting cylinder is arranged on the
tail of the powder flying pipeline.