WO2021250528A1 - Device for producing finely divided powder - Google Patents
Device for producing finely divided powder Download PDFInfo
- Publication number
- WO2021250528A1 WO2021250528A1 PCT/IB2021/054943 IB2021054943W WO2021250528A1 WO 2021250528 A1 WO2021250528 A1 WO 2021250528A1 IB 2021054943 W IB2021054943 W IB 2021054943W WO 2021250528 A1 WO2021250528 A1 WO 2021250528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- consumable material
- plasma
- arc
- control unit
- consumable
- Prior art date
Links
- 239000000843 powder Substances 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000010891 electric arc Methods 0.000 claims abstract description 11
- 238000007750 plasma spraying Methods 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims description 8
- 239000006199 nebulizer Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 238000004157 plasmatron Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/12—Making metallic powder or suspensions thereof using physical processes starting from gaseous material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
Definitions
- the invention relates to equipment for producing fine powders of metals and their alloys by plasma melting and evaporation of wire consumable material in electric arc plasmatrons.
- a device for producing a finely dispersed powder comprising a cathode electrode for arc excitation, an anode electrode, a control unit, a device electrically connected to said control unit for supplying a consumable material to a plasma spraying zone and an electrical circuit for exciting and supplying an electric arc (RU2708200, publication date 05.12. 2019).
- the disadvantage of this known device is the possibility of an uncontrolled change in the volume of the evaporated material and the deterioration of its quality caused by a change in the position of the working zone of the evaporated electrode, due to accidental slippage of the wire in its feeder and possible uneven speed of movement of the feeding elements.
- the problem solved by the present invention is to improve the quality of the powder obtained in electric arc plasma reactors with a consumable wire electrode.
- the technical result achieved with the use of the invention is to improve the quality of the resulting material by increasing the stability of the arc burning and improving the uniformity of the resulting particles.
- said cathode arc excitation electrode is made in the form of a plasma-forming gas flow atomizer, inside which a consumable material passes; plasma spray area.
- a distinctive feature of the present invention is the determination of the position of the working zone of the consumable cathode and the correction based on this information of the feed rate of the consumable material.
- Figure 1 shows a diagram of the device.
- Fig. 2 and Fig. 3 show the position of the working zone in the plasmatron.
- annealed wire of various metals and alloys supplied in bundles is used as a consumable.
- the coils can stick together and form oxides between them.
- the wire coming from the coil is mechanically straightened, undergoing elastic-plastic deformation.
- compressive and tensile stresses arise in the wire material over the entire cross section.
- Possible oxidation of the wire surface during annealing and the stresses arising during wire straightening have a negative effect on the stability of the electric arc and, as a consequence, negatively affect the geometric uniformity of the particles of the resulting powder.
- Fig. 1 shows the following elements: 1 - a gas flow atomizer used as a cathode electrode when the arc is energized; 2 - anode electrode; 3 - consumable material; 4 - a device for feeding a consumable material into the zone 5 of plasma spraying; 8 - control unit.
- the device contains an electrical circuit for exciting and supplying an electric arc.
- the electrical circuit can be implemented in various ways.
- the electrical circuit may include an arc-striking power supply 6; electric keys 7 and 10; power supply 9 of the main arc.
- the device contains a meter 11 of the electrical potential difference between the consumable material 3 and the cathode electrode 1 of the arc excitation.
- the output of the meter 11 is connected to a control unit 8 configured to control the feed rate of the consumable material into the plasma spraying zone.
- the meter 11 determines the position of the working zone 5 of the consumable material (cathode) 3.
- a distinctive feature of the present invention is the regulation of the amount of the evaporated area of the consumable material 3 depending on the voltage at the atomizer 1 of the gas flow.
- the device operates as follows.
- Consumable material 3 is supplied to the channel of the gas flow atomizer 1 by means of device 4. Together with the consumable material 3, plasma-forming gas 12 can also be supplied through the same channel.
- the gas flow atomizer 1 becomes electrically neutral and with the help of the key 10 is connected to the voltage meter 11.
- the electric potential on the gas flow atomizer 1 is supplied to the electronic unit 8, which controls the device 4 for feeding the consumable wire cathode.
- the working area 5 of the consumable cathode 3 is located in the vicinity of the end of the wire. At a given position, the working zone of the consumable cathode 3 is at a certain distance at which the plasma flow (see Fig. 2) does not affect the potential of the nebulizer of the gas flow 1.
- the nebulizer 1 (Fig. 3) the potential on it relative to the wire, under the action of the plasma flow, begins to increase monotonically.
- the potential difference between the wire and the gas atomizer 1, determined by the voltage meter 11, is used as a control signal for the control unit 8.
- the feed rate of the consumable material 3 increases, restoring the preset position of the working zone 5 in the electrode system of the plasmatron and, as a consequence, the magnitude of the arc current.
- the meter 11 is connected to the meter of the difference in electrical potentials between the wire 3 and the gas atomizer 1, which is used at that moment as a neutral electrode.
- the potential at the atomizer corresponds to the potential of the plasma region in contact with it.
- the potential on it relative to the wire 3 begins to increase monotonically to the gas atomizer 1.
- the potential difference between the wire 3 and the gas atomizer 1 is used as a control signal for the control unit 3, which, when the working area and the atomizer approach, increases the wire feed speed, stabilizing the position of the working area of the consumable wire cathode and the magnitude of the arc current.
- Fig. 2 and Fig. 3 show the position of the plasma flow relative to the electrodes of the plasmatron and the atomizer. They additionally indicate the direction 13 of the movement of the plasma with particles of the material of the consumable cathode 3 and the direction 14 of the supply of the wire consumable cathode 3.
- the use of measuring the potential on the gas atomizer 1 to stabilize the position of the working zone 5 of the plasmatron provides an increase in productivity, an increase in the quality of the resulting powder particles and particle size stability due to the stabilization of the arc combustion.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2020118943A RU2756959C1 (en) | 2020-06-08 | 2020-06-08 | Device for producing fine powder |
RU2020118943 | 2020-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021250528A1 true WO2021250528A1 (en) | 2021-12-16 |
Family
ID=78000256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2021/054943 WO2021250528A1 (en) | 2020-06-08 | 2021-06-06 | Device for producing finely divided powder |
Country Status (2)
Country | Link |
---|---|
RU (1) | RU2756959C1 (en) |
WO (1) | WO2021250528A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2133173C1 (en) * | 1997-12-02 | 1999-07-20 | Открытое акционерное общество "Компат" | Process of production of powder with microcrystalline structure |
US6398125B1 (en) * | 2001-02-10 | 2002-06-04 | Nanotek Instruments, Inc. | Process and apparatus for the production of nanometer-sized powders |
EP2741864B1 (en) * | 2011-08-11 | 2017-04-19 | ATI Properties LLC | Process for forming products from atomized metals and alloys |
RU2708200C1 (en) * | 2018-11-23 | 2019-12-05 | Олег Александрович Чухланцев | Plasma-arc reactor with consumable cathode for production of powders of metals, alloys and their chemical compounds |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2603210B1 (en) * | 1986-08-28 | 1989-05-19 | Serole Bernard | GAS ATOMIZATION PIPE, COUPLED WITH AN ELECTRIC ARC OR A PLASMA. |
AU2001232063A1 (en) * | 2000-02-10 | 2001-08-20 | Tetronics Limited | Plasma arc reactor for the production of fine powders |
EP1281296B1 (en) * | 2000-04-10 | 2004-09-29 | Tetronics Limited | Twin plasma torch apparatus |
EP3116636B1 (en) * | 2014-03-11 | 2020-07-08 | Tekna Plasma Systems Inc. | Process and apparatus for producing powder particles by atomization of a feed material in the form of an elongated member |
RU2671034C1 (en) * | 2017-08-28 | 2018-10-29 | Государственный научный центр Российской Федерации - федеральное государственное унитарное предприятие "Исследовательский Центр имени М.В. Келдыша" | Installation for preparing particles of powder and method of its work |
-
2020
- 2020-06-08 RU RU2020118943A patent/RU2756959C1/en active
-
2021
- 2021-06-06 WO PCT/IB2021/054943 patent/WO2021250528A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2133173C1 (en) * | 1997-12-02 | 1999-07-20 | Открытое акционерное общество "Компат" | Process of production of powder with microcrystalline structure |
US6398125B1 (en) * | 2001-02-10 | 2002-06-04 | Nanotek Instruments, Inc. | Process and apparatus for the production of nanometer-sized powders |
EP2741864B1 (en) * | 2011-08-11 | 2017-04-19 | ATI Properties LLC | Process for forming products from atomized metals and alloys |
RU2708200C1 (en) * | 2018-11-23 | 2019-12-05 | Олег Александрович Чухланцев | Plasma-arc reactor with consumable cathode for production of powders of metals, alloys and their chemical compounds |
Also Published As
Publication number | Publication date |
---|---|
RU2756959C1 (en) | 2021-10-07 |
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