CN115383112B - Device and method for preparing high-entropy alloy coating through electric explosion alloying - Google Patents
Device and method for preparing high-entropy alloy coating through electric explosion alloying Download PDFInfo
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- CN115383112B CN115383112B CN202211052447.4A CN202211052447A CN115383112B CN 115383112 B CN115383112 B CN 115383112B CN 202211052447 A CN202211052447 A CN 202211052447A CN 115383112 B CN115383112 B CN 115383112B
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- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/087—Compacting only using high energy impulses, e.g. magnetic field impulses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a device and a method for preparing a high-entropy alloy coating by electric explosion alloying, comprising a motor and a loading hole disc, wherein an output shaft of the motor is connected with the loading hole disc, and a plurality of restraint holes are uniformly distributed on the loading hole disc; also comprises: a low voltage electrode, a high voltage electrode, a DC power supply, and a capacitor; the direct current power supply is connected with the capacitor, one end of the capacitor is connected with the ground wire, the other end of the capacitor is connected with the high-voltage electrode, and the low-voltage electrode is connected with the ground wire. The invention has the beneficial effects that 1, the high-flux preparation of the high-entropy alloy coating can be realized. The preparation of different high-entropy alloy powder and coating can be realized by only adjusting the powder components and the mass ratio during powder mixing. 2. The high-entropy alloy prepared by the electric explosion method is mostly nanocrystalline. The nanometer-sized crystal grains have higher strength, shaping and corrosion resistance, and play a role in further prolonging the service life of the workpiece.
Description
Technical Field
The invention relates to the field of material alloying, in particular to a device and a method for preparing a high-entropy alloy coating by electric explosion alloying.
Background
The high-entropy alloy is a novel alloy developed in recent years, and is widely focused due to the brand new design concept, unique tissue structure, high strength, high hardness, excellent wear resistance, corrosion resistance and other characteristics. The conventional preparation method needs to grind the original powder into high-entropy alloy powder and prepare the high-entropy alloy powder into a coating, so that the preparation efficiency is low, the cooling speed is low, brittle intermetallic compounds are easy to form, the equipment is complex, and the preparation cost is high. Therefore, there is a need to develop a new method for efficiently preparing high entropy alloy coatings. The same problem exists in the preparation of the high-entropy alloy powder, and the high-entropy alloy powder prepared by other methods has irregular shape and obvious segregation.
Disclosure of Invention
The invention aims to solve the problems, and designs a device and a method for preparing a high-entropy alloy coating through electric explosion alloying.
The technical scheme of the invention for realizing the purpose is that the device and the method for preparing the high-entropy alloy coating by electric explosion alloying are realized by the following technical scheme: the device for preparing high-entropy alloy powder and coating by electric explosion alloying is characterized in that a high-voltage electrode and a low-voltage electrode are used for instantly introducing the high-entropy alloy powder and the coating into a carrying belt in a restraint hole filled with metal mixed powder, and the metal mixed powder is instantly heated, melted or even vaporized and explodes in the restraint hole. During the process, the metal mixed powder is alloyed. High-temperature particles generated by electric explosion are sprayed to the surface of the substrate in front of the constraint holes along with the shock waves to form a coating. The electric explosion unit mainly comprises a loading hole tray, loading holes, a loading belt and electrodes. The electric explosion unit is arranged in the cavity, the electrode can drive the material carrying hole disc to rotate, the restraint hole filled with the material carrying belt is ensured to sequentially reach the position between the low-voltage electrode and the high-voltage electrode, and continuous electric explosion is realized.
The device for preparing the high-entropy alloy coating by electric explosion alloying also comprises a matrix support body. The supporting body fixes the matrix on the right side of the high-voltage electrode and right ahead of the material carrying hole, so that the high-entropy alloy coating is formed by depositing the electric explosion spraying particles on the matrix. In addition, through the movement of the supporting body, the change of the base body relative to the position of the loading hole is realized, and the lap joint between the coatings can be controlled.
Further, sealing valves are arranged at the vacuum pump and the air inlet of the chamber body.
The method for preparing the high-entropy alloy coating by electric explosion alloying adopts the device and is carried out according to the following steps:
step 1: 5 or more metal powders are weighed according to proportion and added into a mixer for uniform mixing.
Step 2: the uniformly mixed powder was uniformly added to a groove of a carrier tape made of polyethylene and the mixed powder was compacted.
Step 3: the pressed carrier tape filled with powder is placed in the restraint holes of the carrier hole tray in sequence.
Step 4: the matrix material is held on the support body and the distance between the matrix and the constraining holes is adjusted.
Step 5: closing the electric explosion chamber, starting the vacuum pump, opening a control valve between the control pump and the chamber, and closing the vacuum pump and the control valve when the pressure in the electric explosion chamber is pumped to 500 Pa. Then, a control valve between the air inlet and the chamber is opened, argon is flushed into the electric explosion chamber, when the pressure in the electric explosion chamber is 0.15MPa, the air charging is stopped, and the air charging valve is closed.
Step 6: and starting a circuit control system to charge the capacitor, and adjusting the charging voltage of the capacitor through a voltage adjusting knob.
Step 7: when the electric explosion button is started, the capacitor applies high voltage between the high voltage and the electrode, when the constraint hole on the material carrying hole tray rotates between the two electrodes, pulse high current is led into the mixed powder under the condition of gas discharge, the instant high current heats, melts and alloys the mixed powder, then explosion occurs, and the generated high-temperature particles are sprayed to the surface of the substrate along with shock waves to form a coating.
Step 8: the electrode drives the material carrying hole disc to rotate, and when the next constraint hole rotates between the two electrodes, explosion occurs again, so that continuous electric explosion spraying is realized circularly.
If the base plate material at the front end of the restraining hole is removed, the high-entropy alloy powder can be prepared.
The device and the method for preparing the high-entropy alloy coating by using the electric explosion alloying manufactured by the technical scheme of the invention can realize high-flux preparation of the high-entropy alloy coating. The preparation of different high-entropy alloy powder and coating can be realized by only adjusting the powder components and the mass ratio during powder mixing.
2. The high-entropy alloy prepared by the electric explosion method is mostly nanocrystalline. The nanometer-sized crystal grains have higher strength, shaping and corrosion resistance, and play a role in further prolonging the service life of the workpiece.
3. The bonding strength between the coating substrates is high. The flying speed of the spray particles is high, and meanwhile, the spray particles are completely melted and even vaporized, and can realize metallurgical bonding with the matrix after impacting the matrix. The high bonding strength can expand the application range and service life of the coating.
4. The high-entropy alloy powder and the elements of the coating are uniformly distributed, and no obvious segregation exists.
5. The sphericity of the high-entropy alloy powder is high.
Drawings
FIG. 1 is a schematic diagram of an apparatus for preparing a high-entropy alloy coating by electroexplosion alloying.
FIG. 2 is a schematic diagram of a process for preparing a coating of a super-entropy alloy by electroexplosive alloying
FIG. 3 shows the morphology and the element content of FeCoCrNiAl high-entropy alloy powder prepared by electric explosion alloying
FIG. 4 is an XRD pattern of FeCoCrNiAl high entropy alloy powder
FIG. 5 is a FeCoCrNiAlx high entropy alloy coating prepared by electro-explosive alloying
FIG. 6 is an XRD pattern of a FeCoCrNiAlx high entropy alloy coating
FIG. 7 is a surface element distribution of a FeCoCrNiAl1 high entropy alloy coating
In the figure: 1. a loading hole tray; 2. restraining the hole; 3. a carrier tape; 4. a high voltage electrode; 5. a low voltage motor; 6. a support body; 7. a base; 8. spraying particles; 9. a coating; 10. a proximity switch; 11. a cavity; 12. a control valve; 13. a vacuum pump; 14. an electrode; 15. a coupling; 16. an air inlet; 17. a high pressure probe; 18. a capacitor; 19. rogowski coil.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, as shown in fig. 1-7, an apparatus and method for preparing a high-entropy alloy coating by electro-explosive alloying.
Example 1
The uniformly mixed metal powder is compacted in the grooves of the carrier strip 3. And then placed in the constraint holes 2 of the loading hole tray 1, respectively. The base body 7 is fixed to the support body 6, and the base body 7 is ensured to face the restraint hole 2 between the high-voltage electrode 4 and the high-voltage electrode 5. Closing the cavity 11. The vacuum pump 13 is started and the valve 12 between the vacuum pump 13 and the chamber is opened. When the vacuum reaches 500Pa, the vacuum pump 13 and the control valve 12 are closed, the air inlet 16 is opened, and argon is injected into the cavity. The voltage explosion procedure is initiated and the capacitor 18 will apply a high voltage to the carrier strip 3 between the high voltage electrode 4 and the voltage electrode 5. The ejected particles 8 generated by the electric explosion strike the substrate 7 to form a coating 9. The electrode 14 is connected with the loading hole tray 1 through a coupler 15. The electrode 14 drives the loading orifice disc 1 to rotate. The proximity switch 10 recognizes whether the loading hole is rotated to a position where the electric explosion occurs. During the electric explosion, the high voltage probe 17 and the rogowski coil 19 record voltage and current signals, respectively.
Example 2
The method for preparing the high-entropy alloy powder by electric explosion alloying adopts the device and specifically comprises the following steps:
step 1: 5 or more metal powders are weighed according to proportion and added into a mixer for uniform mixing.
Step 2: the uniformly mixed powder was uniformly added to a groove of a carrier tape made of polyethylene and the mixed powder was compacted.
Step 3: the pressed carrier tape filled with powder is placed in the restraint holes of the carrier hole tray in sequence.
Step 4: closing the electric explosion chamber, starting the vacuum pump, opening a control valve between the control pump and the chamber, and closing the vacuum pump and the control valve when the pressure in the electric explosion chamber is pumped to 500 Pa. Then, a control valve between the air inlet and the chamber is opened, argon is flushed into the electric explosion chamber, when the pressure in the electric explosion chamber is 0.15MPa, the air charging is stopped, and the air charging valve is closed.
Step 5: and starting a circuit control system to charge the capacitor, and adjusting the charging voltage of the capacitor through a voltage adjusting knob.
Step 6: when the high-voltage electrode is applied by the capacitor, and the constraint hole on the material carrying hole tray rotates between the two electrodes, pulse high current is led into the mixed powder under the condition of gas discharge, the instant high current heats, melts and alloys the mixed powder, then explosion occurs, and the generated high-temperature particles are ejected from the constraint hole along with shock waves, so that the particles are quickly solidified into spherical particles in the flight process.
Step 7: the electrode drives the material carrying hole disc to rotate, and explosion occurs again when the next constraint hole rotates between the two electrodes, so that continuous electric explosion preparation of high-entropy alloy powder is circularly realized.
Example 3:
the method for preparing the high-entropy alloy coating by electric explosion alloying adopts the device and comprises the following steps:
step 1: 5 or more metal powders are weighed according to proportion and added into a mixer for uniform mixing.
Step 2: the uniformly mixed powder was uniformly added to a groove of a carrier tape made of polyethylene and the mixed powder was compacted.
Step 3: the pressed carrier tape filled with powder is placed in the restraint holes of the carrier hole tray in sequence.
Step 4: the matrix material is held on the support body and the distance between the matrix and the constraining holes is adjusted.
Step 5: closing the electric explosion chamber, starting the vacuum pump, opening a control valve between the control pump and the chamber, and closing the vacuum pump and the control valve when the pressure in the electric explosion chamber is pumped to 500 Pa. Then, a control valve between the air inlet and the chamber is opened, argon is flushed into the electric explosion chamber, when the pressure in the electric explosion chamber is 0.15MPa, the air charging is stopped, and the air charging valve is closed.
Step 6: and starting a circuit control system to charge the capacitor, and adjusting the charging voltage of the capacitor through a voltage adjusting knob.
Step 7: when the electric explosion button is started, the capacitor applies high voltage between the high voltage and the electrode, when the constraint hole on the material carrying hole tray rotates between the two electrodes, pulse high current is led into the mixed powder under the condition of gas discharge, the instant high current heats, melts and alloys the mixed powder, then explosion occurs, and the generated high-temperature particles are sprayed to the surface of the substrate along with shock waves to form a coating.
Step 8: the electrode drives the material carrying hole disc to rotate, and when the next constraint hole rotates between the two electrodes, explosion occurs again, so that continuous electric explosion spraying is realized circularly.
Example 4
The device for preparing the high-entropy alloy powder and the coating by electric explosion alloying can also be used for preparing the medium-entropy alloy powder and the coating by reducing the quantity of components in the mixed powder by adopting the device.
The above technical solution only represents the preferred technical solution of the present invention, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present invention, and the technical solution falls within the scope of the present invention.
Claims (2)
1. The device for preparing the high-entropy alloy coating by electric explosion alloying comprises a motor and a loading hole plate, and is characterized in that an output shaft of the motor is connected with the loading hole plate, and a plurality of constraint holes are uniformly distributed on the loading hole plate;
also comprises: a low voltage electrode, a high voltage electrode, a DC power supply, and a capacitor;
the direct current power supply is connected with the capacitor, one end of the capacitor is connected with the ground wire, the other end of the capacitor is connected with the high-voltage electrode, and the low-voltage electrode is connected with the ground wire;
through a gas discharge mode, the low-voltage electrode and the high-voltage electrode apply electric energy to the metal mixed powder placed in the material carrying strip groove in the constraint hole;
further comprises: the base body support body and the proximity switch are used for determining whether the restriction hole rotates to a designated position where the electric explosion is to occur or not;
the mixed powder is instantaneously melted and gasified and alloyed, and the generated electric explosion spray particles impact the matrix fixed by the support body to form a high-entropy alloy deposition layer;
a matrix is not placed at the left side of the restriction hole, and the electric explosion spray particles gradually settle and solidify under the action of gravity to form spherical high-entropy alloy powder;
the material carrying hole disc is of a disc-shaped structure, the diameter of the material carrying hole disc is 400mm, and the thickness of the material carrying hole disc is 50-70mm; the diameter of the material carrying hole is 380mm, and the aperture of the material carrying hole is 4mm;
further comprises: the metal powder which is uniformly mixed is uniformly paved in the grooves of the material carrying strip and compacted;
the rotation of the loading hole disc is controlled by a PLC program;
the method also comprises the following steps:
step 1: 5 or more metal powders are weighed according to proportion and added into a mixer for uniform mixing;
step 2: uniformly adding the uniformly mixed powder into a groove of a carrier tape made of polyethylene and compacting the mixed powder;
step 3: sequentially placing the pressed carrier tapes filled with powder in constraint holes of a carrier hole tray;
step 4: holding the matrix material on the support body and adjusting the distance between the matrix and the constraint hole;
step 5: closing the electric explosion chamber, starting the vacuum pump, opening a control valve between the control pump and the chamber, closing the vacuum pump and the control valve when the pressure in the electric explosion chamber is pumped to 500Pa, then opening the control valve between the air inlet and the chamber, flushing argon into the electric explosion chamber, stopping inflation when the pressure in the electric explosion chamber is 0.15MPa, and closing the inflation valve;
step 6: starting a circuit control system to charge the capacitor, and adjusting the charging voltage of the capacitor through a voltage adjusting knob;
step 7: starting an electric explosion button, applying high-voltage to a position between the high-voltage electrode and the capacitor, when a constraint hole on a material carrying hole disc rotates to a position between the two electrodes, introducing pulse high current into mixed powder under the condition of gas discharge, heating, melting and alloying the mixed powder by instantaneous high current, then exploding, and ejecting generated high-temperature particles from the material carrying hole along with shock waves, and settling and solidifying the high-temperature particles under the action of gravity to form spherical powder;
step 8: the electrode drives the material carrying hole disc to rotate 18 degrees, explosion occurs again when the next constraint hole rotates between the two electrodes, and continuous electric explosion is circularly realized in this way;
step 9: powder settled on the inner wall of the cavity is collected in the powder collecting device through the powder scraping device.
2. The method for preparing a high-entropy alloy coating according to claim 1, wherein the step 1: 5 or more metal powders are weighed according to proportion and added into a mixer for uniform mixing;
step 2: uniformly adding the uniformly mixed powder into a groove of a carrier tape made of polyethylene and compacting the mixed powder;
step 3: sequentially placing the pressed carrier tapes filled with powder in constraint holes of a carrier hole tray;
step 4: holding the matrix material on the support body and adjusting the distance between the matrix and the constraint hole;
step 5: closing the electric explosion chamber, starting the vacuum pump, opening a control valve between the control pump and the chamber, closing the vacuum pump and the control valve when the pressure in the electric explosion chamber is pumped to 500Pa, then opening the control valve between the air inlet and the chamber, flushing argon into the electric explosion chamber, stopping inflation when the pressure in the electric explosion chamber is 0.15MPa, and closing the inflation valve;
step 6: starting a circuit control system to charge the capacitor, and changing the charging voltage of the capacitor through a voltage adjusting knob;
step 7: starting an explosion button, applying high-voltage electricity between the high-voltage electrode and the capacitor, when a constraint hole on a material carrying hole disc rotates between the two electrodes, introducing pulse high current into mixed powder under the condition of gas discharge, heating, melting and alloying the mixed powder by instantaneous high current, and then exploding, wherein generated high-temperature particles are sprayed to the surface of a substrate along with shock waves to form a coating;
step 8: the electrode drives the material carrying hole disc to rotate 18 degrees, explosion happens again when the next constraint hole rotates between the two electrodes, and continuous electric explosion spraying is realized in such a cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211052447.4A CN115383112B (en) | 2022-08-31 | 2022-08-31 | Device and method for preparing high-entropy alloy coating through electric explosion alloying |
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| CN202211052447.4A CN115383112B (en) | 2022-08-31 | 2022-08-31 | Device and method for preparing high-entropy alloy coating through electric explosion alloying |
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| CN115383112B true CN115383112B (en) | 2023-08-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2107082A (en) * | 1981-09-29 | 1983-04-20 | Leninskaya Kuznitsa Ts K Bjuro | Apparatus for applying coatings by detonation |
| WO1997023302A1 (en) * | 1995-12-26 | 1997-07-03 | Aerostar Coatings, S.L. | Method and apparatus for applying multi-layered coatings by detonation |
| CN105127023A (en) * | 2015-10-10 | 2015-12-09 | 兰州理工大学 | Small-caliber tube inner wall powder electrothermal explosion spraying device |
| CN112063961A (en) * | 2020-09-11 | 2020-12-11 | 深圳大学 | Preparation method of high-entropy alloy coating |
| CN113604771A (en) * | 2021-07-28 | 2021-11-05 | 兰州理工大学 | Device and method for preparing magnesium alloy microtube by electric explosion jet deposition method |
-
2022
- 2022-08-31 CN CN202211052447.4A patent/CN115383112B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2107082A (en) * | 1981-09-29 | 1983-04-20 | Leninskaya Kuznitsa Ts K Bjuro | Apparatus for applying coatings by detonation |
| WO1997023302A1 (en) * | 1995-12-26 | 1997-07-03 | Aerostar Coatings, S.L. | Method and apparatus for applying multi-layered coatings by detonation |
| CN105127023A (en) * | 2015-10-10 | 2015-12-09 | 兰州理工大学 | Small-caliber tube inner wall powder electrothermal explosion spraying device |
| CN112063961A (en) * | 2020-09-11 | 2020-12-11 | 深圳大学 | Preparation method of high-entropy alloy coating |
| CN113604771A (en) * | 2021-07-28 | 2021-11-05 | 兰州理工大学 | Device and method for preparing magnesium alloy microtube by electric explosion jet deposition method |
Non-Patent Citations (1)
| Title |
|---|
| 约束电爆喷射沉积碳质增强/ 银基复合涂层;李红阔 等;《焊接设备与材料》;第67-71页 * |
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