CN109351982B - Powder making method for continuously producing copper-chromium alloy - Google Patents
Powder making method for continuously producing copper-chromium alloy Download PDFInfo
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- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0836—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with electric or magnetic field or induction
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
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- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0896—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid particle transport, separation: process and apparatus
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Abstract
The invention discloses a powder making method for continuously producing copper-chromium alloy, which comprises the following steps: (1) respectively putting 0.7-40% of chromium and the balance of copper in a ceramic crucible according to the weight ratio for melting, and stirring by electromagnetic induction; (2) atomizing and crushing the metal liquid into a large number of fine liquid drops, carrying out induction heating on the flow guide nozzle, enabling the molten liquid to flow out of the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process; (3) the fine droplets are solidified into spherical and sub-spherical particles in flight, and then are separated by a sieve to prepare metal powder with various particle sizes. The invention heats and melts by electromagnetic induction, stirs by electromagnetic induction, and adopts rapid gas atomization, so that the copper-chromium alloy forms small droplets and is rapidly cooled, and the separation of copper and chromium phases in a solid state is avoided.
Description
Technical Field
The invention belongs to the technical field of alloy preparation, and particularly relates to a method for continuously producing copper-chromium alloy powder.
Background
Vacuum electromagnetic induction smelting: the material with better magnetic induction obtains induction current by the electromagnetic induction principle, thereby achieving the purpose of heating. The current passes through an electromagnetic coil surrounding the metal material at a certain frequency, and the changing current generates an induction magnetic field and causes the inside of the metal to generate an induction current and a large amount of heat for heating the material. In the process, the whole process is carried out in a vacuum environment, so that the method is beneficial to removing gas impurities in the metal, and the obtained metal alloy material is purer. In the melting process, due to the characteristics of the induction melting technology, the liquid metal material can be automatically stirred in the crucible under the interaction of electromagnetic force, so that the components are more uniform.
An atomization powder preparation method: when atomizing to prepare powder, firstly, an electric furnace or an induction furnace is used for smelting metal raw materials into alloy liquid with qualified components (generally overheated by 100-150 ℃), and then the alloy liquid is injected into a tundish above an atomizing nozzle. The alloy liquid flows out from a leak hole at the bottom of the tundish, meets high-speed airflow or water flow when passing through the nozzle and is atomized into fine droplets, and the atomized droplets are rapidly solidified into alloy powder in the closed atomizing cylinder. Each particle of this powder not only has exactly the same uniform chemical composition as a given molten alloy, but also refines the crystalline structure due to rapid solidification; eliminating macro-segregation of the second phase.
In the prior art, a graphite crucible is used as a copper-chromium alloy carrier, so that the harm of impurities formed by the reaction of chromium and carbon exists; continuous production cannot be realized; the density difference exists between the copper phase and the chromium phase, the copper phase and the chromium phase need to be stirred in the melting process, otherwise, the components are easy to be uneven; the copper-chromium alloy has fast heat dissipation and poor fluidity, and is easy to block a flow passage and a nozzle; when the chromium content is between 0.7% and 40%, the phases separate if cooling is slow.
Disclosure of Invention
Aiming at the technical problems, the invention provides a continuous production copper-chromium alloy powder making technology which adopts a vacuum induction smelting mode, ensures the uniformity of components by utilizing electromagnetic stirring, effectively combines vacuum induction smelting and vacuum atomization powder making by shortening the conventional vacuum atomization powder making process and removing the tundish process, and avoids the blocking caused by heat dissipation and the segregation phenomenon caused by too slow cooling of copper-chromium alloy melt in the flowing process.
The technical scheme of the invention is a method for continuously producing copper-chromium alloy powder, which comprises the following steps:
(1) vacuum induction melting: the material composition and weight percentage are as follows: 0.7 to 40 percent of chromium and the balance of copper, a vacuum induction melting part of the vacuum gas atomization powder making equipment is provided with a plurality of induction heating units, each unit is provided with a ceramic crucible, required materials are respectively filled into the ceramic crucibles, a vacuum pumping system is started, and when the vacuum degree reaches 10-3Pa～10-1Pa, gradient power-increasing heating mode by medium-frequency electromagnetic inductionFurther releasing the gas in the raw material, closing the vacuum pumping system when the temperature of the raw material in the ceramic crucible reaches 1000-1200 ℃, filling inert gas under the condition of-0.09 Mpa to-0.06 Mpa, stirring by electromagnetic induction, and continuously heating until the raw material is in a molten state;
(2) atomizing to prepare powder: detecting by an infrared temperature measuring instrument, removing a plug at the bottom of the ceramic crucible when the superheat degree of the copper-chromium alloy melt reaches 50-200 ℃, enabling the copper-chromium alloy melt to directly flow out downwards through a flow guide nozzle below the ceramic crucible, atomizing and crushing the metal liquid into a large number of fine liquid drops by high-pressure inert gas flow through a nozzle under the condition that the air pressure is 2-30 MPa, carrying out induction heating on the flow guide nozzle after the melt flow in the unit is finished, preventing blockage, simultaneously rotating a rotating shaft, butting the ceramic crucible and the flow guide nozzle in the next induction heating unit, stopping induction heating on the flow guide nozzle, enabling the melt to flow out from the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process;
(3) cooling and screening: the fine liquid drops are solidified into spherical and sub-spherical particles in flight, and then the metal powder with various particle sizes is prepared by screening separation; the sphericity ratio of the formed metal powder reaches 95-99%, and the particle size of the powder is less than 60 mu m.
Further, the gradient-increasing high-power heating mode in the step (1): the method comprises the first stage of controlling the power to be 800-1000 Hz, carrying out heating treatment for 10-20 min, the second stage of controlling the power to be 1200-1400 Hz, carrying out heating treatment for 15-25 min, carrying out heat preservation treatment for 12-18 min, and the third stage of controlling the power to be 1800-2000 Hz, carrying out heating treatment for 30-35 min, ensuring that the heating temperature of the raw material is continuously changed by the gas in the raw material in a gradient power heating mode, being beneficial to removing gas impurities in metal, and enabling the obtained metal alloy material to be purer.
Further, when electromagnetic induction stirring is carried out in the step (1), firstly controlling the stirring speed to be 800-1200 r/min, stirring time to be 5-7 min, then reducing the speed to be 600-1000 r/min at the speed of 10-20 r/min, stirring time to be 8-12 min, then controlling the stirring speed to be 1100-1400 r/min, and stirring time to be 4-6 min, when the metal becomes liquid, the uneven fluidity of the metal liquid is poor, and the viscosity of the copper-chromium alloy is adjusted through continuous speed regulation stirring of electromagnetic induction, so that the mixing type of the two raw materials can be ensured, and the even dispersion is ensured.
Further, the inert gas in the step (1) is a dry gas composed of one or more of argon, helium and krypton, and protects the raw material in the heating process.
Further, when the high-pressure inert gas flow atomization crushing is carried out in the step (2), the inert gas flow is low-temperature dry mixed gas consisting of argon and helium in a volume ratio of 1.5:1, the temperature of the inert gas flow is 6-8 ℃, the flow rate of the inert gas flow is 100-130 mL/min, and the segregation phenomenon caused by separation of copper and chromium phases in a solid state and over-slow cooling is avoided.
Further, before screening in the step (3), the obtained solidified spherical and subspherical particles are blown by wind in a low-temperature dry nitrogen environment, the low-temperature is 10-12 ℃, the gas flow rate is 150-180 sccm, standing treatment is carried out for 10-15 min, then treatment is carried out for 6-10 min under the conditions that the ultrasonic frequency is 20-30 KHz and the vacuum degree is 0.04-0.06 MPa, and screening is carried out through oscillation, so that the same uniform chemical components in the formed particles can be guaranteed.
Further, when the step (3) is carried out screening, screening the solidified spherical and subsphaeroidal particles by a screening membrane to prepare metal powder with various particle sizes; the preparation method of the screening membrane comprises the following steps: adding tungsten carbide alloy into polyethylene glycol under the condition that the microwave frequency is 350-500 MHz, and treating for 12-18 min; then carrying out vacuum defoamation for 1.2h under the conditions that the temperature is 35 ℃ and the vacuum degree is 0.01-0.2 MPa to prepare a mixed solution of which the tungsten carbide concentration is 0.3-0.5 g/mL; then, under the protection atmosphere of mixed gas consisting of argon and nitrogen with the volume ratio of 1:1.2 and at the temperature of 200-300 ℃, carrying out pulse treatment on the foam metallic tin substrate for 5-10 s, and cooling the foam metallic tin substrate to room temperature; treating the mixed solution and the treated foam metal matrix for 25-45 min under the conditions that the pressure is 0.1-0.2 MPa and the centrifugal rate is 2800-3000 r/min to obtain a semi-finished product screening membrane, and performing dispersion treatment under the condition that the ultrasonic frequency is 15-25 KHz; after the treatment is finished, carrying out vacuum drying treatment and sintering treatment to obtain a screening membrane; and (3) adding pore assistants with different micron grades to adjust the membrane pore size to obtain the particle screening membrane to be used.
The invention has the beneficial effects that: the invention adopts the ceramic crucible, avoids the reaction of carbon and chromium, optimizes and shortens the conventional vacuum gas atomization process flow in view of the characteristics of poor uniformity, poor heat dissipation, poor fluidity and easy segregation of the copper-chromium alloy, cancels the process that molten metal flows through the nozzle through the tundish in the conventional vacuum gas atomization process, effectively combines the vacuum induction melting and vacuum gas atomization processes, ensures the uniformity of the components of the molten liquid through the induction melting, and because the process of the tundish is cancelled, the phenomenon that the copper-chromium alloy melt blocks the runner and the nozzle due to fast heat dissipation is effectively avoided, meanwhile, the separation of copper and chromium phases in a solid state is prevented by a high-speed airflow cooling mode, the passing pressure of the filtered substances can be reduced by the sieving membrane, the filtering efficiency is improved, the size of the material particles is effectively controlled by sieving the membrane, and the invention realizes continuous batch production.
Detailed Description
Example 1
A powder making method for continuously producing copper-chromium alloy comprises the following steps:
(1) vacuum induction melting: the material composition and weight percentage are as follows: chromium 0.7%, copper allowance, vacuum induction melting part of vacuum gas atomization powder manufacturing equipment, multiple induction heating units are arranged, each unit is provided with a ceramic crucible, required materials are respectively filled into the ceramic crucibles, a vacuum pumping system is started, and when the vacuum degree reaches 10-1Pa, heating by gradient of medium-frequency electromagnetic induction, controlling power at 800Hz for 10min in the first stage, controlling power at 1200Hz for 15min, maintaining temperature for 12min in the second stage, controlling power at 1800Hz for 30min in the third stage, further releasing gas in the raw materials, closing the vacuum pumping system when the temperature of the raw materials in the ceramic crucible reaches 1000 ℃, and filling the ceramic crucible with the gas under-0.09 Mpa MPaArgon is stirred by electromagnetic induction, the stirring speed is controlled to be 800r/min, the stirring time is 5min, then the speed is reduced to 600r/min at the speed of 10r/min, the stirring time is 8min, then the stirring speed is controlled to be 1100r/min, the stirring time is 4min, and the heating is continued until the raw material is in a molten state;
(2) atomizing to prepare powder: detecting by an infrared temperature measuring instrument, removing a plug at the bottom of the ceramic crucible when the superheat degree of the copper-chromium alloy melt reaches 50 ℃, enabling the copper-chromium alloy melt to directly flow downwards through a flow guide nozzle below the ceramic crucible, atomizing and crushing the metal liquid into a large number of fine liquid drops by high-pressure inert gas through a nozzle under the condition that the air pressure is 2MPa, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in a volume ratio of 1.5:1, the temperature of the inert gas flow is 6 ℃, the flow rate of the gas flow is 100mL/min, after the melt in the unit is completely flowed, carrying out induction heating on the flow guide nozzle to prevent blockage, simultaneously rotating a rotating shaft, butting the ceramic crucible and the flow guide nozzle in the next induction heating unit, carrying out induction heating on the flow guide nozzle to stop, enabling the melt to flow out from the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process;
(3) cooling and screening: solidifying the fine liquid drops into spherical and sub-spherical particles in flight, blowing in a low-temperature dry nitrogen environment at the low temperature of 10 ℃ and the gas flow rate of 150sccm, standing for 10min, treating for 6min under the conditions of the ultrasonic frequency of 20KHz and the vacuum degree of 0.04MPa, vibrating, and screening to prepare metal powder with various particle sizes, wherein the sphericity reaches 95% and the particle size is less than 60 mu m.
Example 2
A powder making method for continuously producing copper-chromium alloy comprises the following steps:
(1) vacuum induction melting: the material composition and weight percentage are as follows: 30% of chromium, the balance of copper, a vacuum induction melting part of a vacuum gas atomization powder making device, a plurality of induction heating units are arranged, each unit is provided with a ceramic crucible, required materials are respectively filled into the ceramic crucibles, a vacuum pumping system is started, and when the vacuum degree reaches 10-2Pa, gradient boost power by medium frequency electromagnetic inductionHeating, wherein in the first stage, the power is controlled to be 900Hz, the heating treatment is carried out for 15min, in the second stage, the power is controlled to be 1300Hz, the heating treatment is carried out for 20min, the heat preservation treatment is carried out for 15min, in the third stage, the power is controlled to be 1900Hz, the heating treatment is carried out for 33min, so that the gas in the raw material is further released, when the temperature of the raw material in the ceramic crucible reaches 1100 ℃, a vacuum pumping system is closed, mixed gas of helium and krypton is filled according to the volume ratio of 1:1 under the condition of-0.08 MPa, the stirring speed is controlled to be 1000r/min at first, the stirring time is 6min, then the speed is reduced to 800r/min at the speed of 15r/min, the stirring time is 10min, then the stirring speed is controlled to be 1200r/min, the stirring time is 5min, and the heating is continued until the raw material is in a molten state;
(2) atomizing to prepare powder: detecting by an infrared temperature measuring instrument, removing a plug at the bottom of the ceramic crucible when the superheat degree of the copper-chromium alloy melt reaches 170 ℃, enabling the copper-chromium alloy melt to directly flow downwards through a flow guide nozzle below the ceramic crucible, atomizing and crushing the metal liquid into a large number of fine liquid drops by high-pressure inert gas through a nozzle under the condition that the air pressure is 15MPa, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in a volume ratio of 1.5:1, the temperature of the inert gas flow is 7 ℃, the flow rate of the gas flow is 120mL/min, after the melt in the unit is completely flowed, carrying out induction heating on the flow guide nozzle to prevent blockage, simultaneously rotating a rotating shaft, butting the ceramic crucible and the flow guide nozzle in the next induction heating unit, carrying out induction heating on the flow guide nozzle to stop, enabling the melt to flow out from the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process;
(3) cooling and screening: solidifying the fine liquid drops into spherical and sub-spherical particles in flight, blowing in a low-temperature dry nitrogen environment at the low temperature of 11 ℃ and the gas flow rate of 160sccm, standing for 13min, treating for 8min under the conditions of the ultrasonic frequency of 25KHz and the vacuum degree of 0.05MPa, oscillating, and screening to prepare metal powder with various particle sizes, wherein the sphericity reaches 96 percent and the particle size is less than 60 mu m.
Example 3
A powder making method for continuously producing copper-chromium alloy comprises the following steps:
(1) vacuum induction melting: the material composition and weight percentage are as follows: 40% of chromium, the balance of copper, a vacuum induction melting part of a vacuum gas atomization powder making device, a plurality of induction heating units are arranged, each unit is provided with a ceramic crucible, required materials are respectively filled into the ceramic crucibles, a vacuum pumping system is started, and when the vacuum degree reaches 10-3Pa, heating by adopting gradient rise power of medium-frequency electromagnetic induction, controlling the power at 1000Hz for 20min, controlling the power at 1400Hz for 25min, performing heat preservation for 18min, controlling the power at 2000Hz for 35min for further releasing the gas in the raw material, closing a vacuum pumping system when the temperature of the raw material in the ceramic crucible reaches 1200 ℃, filling mixed gas of argon, krypton and helium according to the volume ratio of 1.5:1:1 under the condition of-0.06 MPa, stirring by electromagnetic induction, firstly controlling the stirring rate at 1200r/min and the stirring time at 7min, then reducing the speed to 1000r/min at the speed of 20r/min, stirring for 12min, then controlling the stirring rate at 1400r/min and the stirring time at 6min, continuing to heat the raw materials until the raw materials are in a molten state;
(2) atomizing to prepare powder: detecting by an infrared temperature measuring instrument, removing a plug at the bottom of the ceramic crucible when the superheat degree of the copper-chromium alloy melt reaches 200 ℃, enabling the copper-chromium alloy melt to directly flow downwards through a flow guide nozzle below the ceramic crucible, atomizing and crushing metal liquid into a large number of fine liquid drops by high-pressure inert gas through a nozzle under the condition that the air pressure is 30MPa, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in a volume ratio of 1.5:1, the temperature of the inert gas flow is 8 ℃, the flow rate of the gas flow is 130mL/min, after the melt in the unit is completely flowed, carrying out induction heating on the flow guide nozzle to prevent blockage, simultaneously rotating a rotating shaft, butting the ceramic crucible and the flow guide nozzle in the next induction heating unit, carrying out induction heating on the flow guide nozzle to stop, enabling the melt to flow out from the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process;
(3) cooling and screening: solidifying the fine liquid drops into spherical and sub-spherical particles in flight, blowing in a low-temperature dry nitrogen environment at the low temperature of 12 ℃, keeping the gas flow rate of 180sccm, standing for 15min, treating for 10min under the conditions of 30KHz ultrasonic frequency and 0.06MPa vacuum degree, and separating by a screening membrane sieve to prepare metal powder with various particle sizes, wherein the spherical rate reaches 99 percent, and the particle size is less than 60 mu m; the preparation method of the screening membrane comprises the following steps: adding tungsten carbide alloy into polyethylene glycol under the condition that the microwave frequency is 500MHz, and treating for 18 min; then carrying out vacuum defoamation for 1.2h under the conditions that the temperature is 35 ℃ and the vacuum degree is 0.2MPa to prepare mixed liquor with the tungsten carbide concentration of 0.5 g/mL; then, under the protection atmosphere of mixed gas consisting of argon and nitrogen with the volume ratio of 1:1.2 and the temperature of 300 ℃, carrying out pulse treatment on the foam metal tin substrate for 10s, and cooling the foam metal tin substrate to room temperature; treating the mixed solution and the treated foam metal matrix for 45min under the conditions that the pressure is 0.2MPa and the centrifugal rate is 3000r/min to obtain a semi-finished product screening membrane, and performing dispersion treatment under the condition that the ultrasonic frequency is 25 KHz; after the treatment is finished, carrying out vacuum drying treatment and sintering treatment to obtain a screening membrane; and (3) adding pore assistants with different micron grades to adjust the membrane pore size to obtain the particle screening membrane to be used. .
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. The method for continuously producing the copper-chromium alloy powder is characterized by comprising the following steps of:
(1) vacuum induction melting: the material composition and weight percentage are as follows: 0.7 to 40 percent of chromium and the balance of copper, and a vacuum induction melting part of the vacuum gas atomization powder making equipment is provided with a plurality of induction heating units, and each unit is provided with one induction heating unitRespectively filling the required materials into the ceramic crucibles, starting a vacuum pumping system until the vacuum degree reaches 10-1Pa～10-3Pa, further releasing gas in the raw material by adopting a gradient boosting power heating mode of medium-frequency electromagnetic induction, closing a vacuum pumping system when the temperature of the raw material in the ceramic crucible reaches 1000-1200 ℃, filling inert gas under the condition of-0.09 Mpa to-0.06 Mpa, stirring by electromagnetic induction, and continuously heating until the raw material is in a molten state;
(2) atomizing to prepare powder: detecting by an infrared temperature measuring instrument, removing a plug at the bottom of the ceramic crucible when the superheat degree of the copper-chromium alloy melt reaches 50-200 ℃, enabling the copper-chromium alloy melt to directly flow out downwards through a flow guide nozzle below the ceramic crucible, atomizing and crushing the metal liquid into a large number of fine liquid drops by high-pressure inert gas flow through a nozzle under the condition that the air pressure is 2-30 MPa, carrying out induction heating on the flow guide nozzle after the melt flow in the unit is finished, preventing blockage, simultaneously rotating a rotating shaft, butting the ceramic crucible and the flow guide nozzle in the next induction heating unit, stopping induction heating on the flow guide nozzle, enabling the melt to flow out from the flow guide nozzle at the bottom of the ceramic crucible, and repeating the atomization powder making process;
(3) cooling and screening: the fine liquid drops are solidified into spherical and sub-spherical particles in flight, and then the metal powder with various particle sizes is prepared by screening separation;
the gradient-increasing high-power heating mode in the step (1) comprises the following steps: the method comprises the steps of firstly, controlling the power to be 800-1000 Hz, carrying out heating treatment for 10-20 min, secondly, controlling the power to be 1200-1400 Hz, carrying out heating treatment for 15-25 min, carrying out heat preservation treatment for 12-18 min, and thirdly, controlling the power to be 1800-2000 Hz, and carrying out heating treatment for 30-35 min;
before screening in the step (3), firstly blowing the obtained solidified spherical and subsphaeroidal particles in a low-temperature dry nitrogen environment, standing for 10-15 min at the low temperature of 10-12 ℃ and at the gas flow rate of 150-180 sccm, treating for 6-10 min under the conditions of the ultrasonic frequency of 20-30 KHz and the vacuum degree of 0.04-0.06 MPa, and screening by oscillation;
when screening is carried out in the step (3), screening the solidified spherical and subsphaeroidal particles by a screening membrane to prepare metal powder with various particle sizes; the preparation method of the screening membrane comprises the following steps: adding tungsten carbide alloy into polyethylene glycol under the condition that the microwave frequency is 350-500 MHz, and treating for 12-18 min; then carrying out vacuum defoamation for 1.2h under the conditions that the temperature is 35 ℃ and the vacuum degree is 0.01-0.2 MPa to prepare a mixed solution of which the tungsten carbide concentration is 0.3-0.5 g/mL; then, under the protection atmosphere of mixed gas consisting of argon and nitrogen with the volume ratio of 1:1.2 and at the temperature of 200-300 ℃, carrying out pulse treatment on the foam metallic tin substrate for 5-10 s, and cooling the foam metallic tin substrate to room temperature; treating the mixed solution and the treated foam metal matrix for 25-45 min under the conditions that the pressure is 0.1-0.2 MPa and the centrifugal rate is 2800-3000 r/min to obtain a semi-finished product screening membrane, and performing dispersion treatment under the condition that the ultrasonic frequency is 15-25 KHz; after the treatment is finished, carrying out vacuum drying treatment and sintering treatment to obtain a screening membrane;
when the electromagnetic induction stirring is carried out in the step (1), firstly, the stirring speed is controlled to be 800-1200 r/min, the stirring time is 5-7 min, then, the speed is reduced to 600-1000 r/min at the speed of 10-20 r/min, the stirring time is 8-12 min, then, the stirring speed is controlled to be 1100-1400 r/min, and the stirring time is 4-6 min.
2. The powder manufacturing method for continuously producing Cu-Cr alloy as claimed in claim 1, wherein in step (1), the inert gas is dry gas consisting of one or more of Ar, He and Kr.
3. The continuous copper-chromium alloy powder production method of claim 1, wherein in the step (2), when the high-pressure inert gas flow atomization crushing is performed, the inert gas flow is a high-temperature dry mixed gas consisting of argon and helium in a volume ratio of 1.5:1, the temperature of the inert gas flow is 6-8 ℃, and the flow rate of the inert gas flow is 100-130 mL/min.
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| CN109943746B (en) * | 2019-04-20 | 2020-01-14 | 陕西斯瑞新材料股份有限公司 | Preparation method of ultrafine-grained copper-chromium contact |
| CN110029245A (en) * | 2019-05-10 | 2019-07-19 | 长沙新材料产业研究院有限公司 | A kind of copper alloy powder and preparation method thereof, application |
| CN110153438A (en) * | 2019-06-22 | 2019-08-23 | 陕西斯瑞新材料股份有限公司 | A kind of chromiumcopper powder by atomization technique of free-falling formula nozzle |
| DE102019122000A1 (en) | 2019-08-15 | 2021-02-18 | Ald Vacuum Technologies Gmbh | Method and device for dividing an electrically conductive liquid |
| CN111036921A (en) * | 2019-12-17 | 2020-04-21 | 陕西斯瑞新材料股份有限公司 | Preparation method of large-size dispersed copper bar |
| CN111036927A (en) * | 2019-12-25 | 2020-04-21 | 陕西斯瑞新材料股份有限公司 | Method for preparing GRCop-84 spherical powder based on VIGA process |
| CN111719087B (en) * | 2020-05-19 | 2021-06-01 | 陕西斯瑞新材料股份有限公司 | Preparation method of medical CuFe alloy powder |
| CN111822725B (en) * | 2020-09-21 | 2020-12-15 | 陕西斯瑞新材料股份有限公司 | Preparation method of alloy powder for recycling copper-chromium alloy |
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