Method for producing a metal powder, comprising an electric explosion of a piece of a steel wire
A method for producing a metal powder, comprising an electric explosion of a piece of a steel wire carried out inside a reactor at a pressure of a gaseous medium of 10 −5 Pa and its forced circulation, characterized in that the method further comprises a pre-evacuation of a volume contained inside the reactor and pipes connecting it to a cyclone, whose lower part is equipped with a hopper, to a residual pressure of 10 −2 Pa, then it is filled with carbon monoxide to a pressure of 10 5 Pa at a gas flow rate of 10 m/s at a reactor inlet, the electric explosion of the steel wire made of low-carbon steel is then carried out at a specific energy of 7-18 kj/g and a pulse duration of 1,2-2 μs, products of the electric explosion are extracted by gas flow through the cyclone into the hopper to deposit, once the hopper is filled, the process is halted, the hopper is disconnected from the cyclone, closed with a lid with an opening, and kept in this state for at least 48 hours, the resulting powder is then removed and placed into a container for storage.
1 . A method for producing a metal powder, comprising:
carrying out an electric explosion of a piece of a steel wire made of low-carbon steel inside a reactor at a pressure of a gaseous medium of 10 5 Pa
providing forced circulation of the gaseous medium at a first predetermined gas flow rate;
providing a cyclone, wherein the cyclone comprises a lower part that is equipped with a hopper;
performing a pre-evacuation of a volume contained inside the reactor and pipes connecting the reactor to the cyclone to a residual pressure of 10 −2 Pa;
filling the reactor and the pipes with carbon monoxide to a predetermined pressure at a second predetermined gas flow rate at a reactor inlet;
carrying out the electric explosion of the steel wire made of low-carbon steel at a specific energy of 7-18 KJ/g and a pulse duration of 1.2-2 μs;
extracting products of the electric explosion by gas flow through the cyclone into the hopper for deposit;
maintaining a state of the hopper for at least 48 hours to obtain a resulting metal powder; and
removing the resulting metal powder.
2 . The method according to claim 1 , wherein the first predetermined gas flow rate is in a range of 1.5 m/s to 2.5 m/s.
3 . The method according to claim 1 , wherein the second predetermined gas flow rate is 10 m/s.
4 . The method according to claim 1 , wherein the predetermined pressure is 10 5 Pa.
5 . The method according to claim 1 , further comprising, once the hopper is filled, halting the process of producing the metal powder, disconnecting the hopper from the cyclone, and closing the hopper with a lid with an opening.
6 . The method according to claim 1 , further comprising placing the resulting powder into a container for storage.
7 . The method according to claim 1 , wherein the steel wire made of low-carbon steel comprises SV-08 grade alloy.
8 . The method according to claim 1 , wherein the steel wire has a diameter of 0.3 mm.
9 . The method according to claim 1 , wherein an interelectrode gap in the reactor has a length of 80 mm.
10 . The method according to claim 1 , wherein the resulting metal powder comprises a mixture of nanoparticles ranging in size from 20 to 300 nm and microparticles with a size of up to 2 μm.
11 . The method according to claim 1 , wherein the resulting metal powder comprises pure iron particles in the form of α-Fe phase and austenite compound in the form of Fe—C.
12 . The method according to claim 1 , wherein the resulting metal powder has a specific surface area in a range of 4 m2/g to 11 m2/g.
13 . A method for producing a metal powder, comprising:
carrying out an electric explosion of a piece of a steel wire made of low-carbon steel inside a reactor at a pressure of a gaseous medium of 10 5 Pa and its forced circulation;
performing a pre-evacuation of a volume contained inside the reactor and pipes connecting the reactor to a cyclone, wherein the cyclone comprises a lower part that is equipped with a hopper, to a residual pressure of 10 −2 Pa;
filling the reactor with carbon monoxide to a pressure of 10 5 Pa at a gas flow rate of 10 m/s at a reactor inlet;
carrying out the electric explosion of the steel wire made of low-carbon steel at a specific energy of 7-18 KJ/g and a pulse duration of 1-2 μs;
extracting products of the electric explosion by gas flow through the cyclone into the hopper for deposit;
once the hopper is filled, halting the process of producing the metal powder, disconnecting the hopper from the cyclone, closing the hopper with a lid with an opening, and maintaining a state of the hopper for at least 48 hours to obtain a resulting metal powder; and
removing the resulting metal powder and placing the resulting metal powder into a container for storage.
14 . The method according to claim 13 , wherein the steel wire made of low-carbon steel comprises SV-08 grade alloy.
15 . The method according to claim 13 , wherein the steel wire has a diameter of 0.3 mm.
16 . The method according to claim 13 , wherein an interelectrode gap in the reactor has a length of 80 mm.
17 . The method according to claim 13 , wherein the lid with an opening has an opening diameter of 1 mm.
18 . The method according to claim 13 , wherein the resulting metal powder comprises a mixture of nanoparticles ranging in size from 20 to 300 nm and microparticles with a size of up to 2 μm.
19 . The method according to claim 13 , wherein the resulting metal powder comprises pure iron particles in the form of a-Fe phase and austenite compound in the form of Fe—C.
20 . The method according to claim 13 , wherein the resulting metal powder has a specific surface area in a range of 4 m2/g to 11 m2/g.