CN111036927A - Method for preparing GRCop-84 spherical powder based on VIGA process - Google Patents
Method for preparing GRCop-84 spherical powder based on VIGA process Download PDFInfo
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C9/00—Alloys based on copper
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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
- 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
- B22F2009/0824—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 a specific atomising fluid
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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
- 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
- B22F2009/0848—Melting process before atomisation
Abstract
The invention discloses a method for preparing GRCop-84 spherical powder based on a VIGA process, wherein the GRCop-84 material mainly comprises the following chemical components in percentage by weight: cu- (5-7) wt.% Cr- (4.5-6.5) wt.% Nb. The method comprises the following steps: 1) adding the elementary substances into a crucible for smelting, pouring and forging to obtain a bar blank; 2) processing the alloy bar into a copper alloy bar; 3) secondarily melting the bar stock, stirring by electromagnetic induction, pre-vacuumizing, and then filling inert protective gas; 4) pouring the solution into a tundish, keeping the temperature, standing, and heating atomized gas; 5) introducing the metal liquid into an atomization cabin through a guide pipe, atomizing and crushing the liquid into a large number of fine liquid drops, and solidifying the liquid drops into spherical powder particles in the flying process; 6) collecting the obtained GRCop-84 spherical powder, cooling and vacuum packaging. The method can prepare the CuCrZr spherical powder with uniform particle size, high sphericity and low impurity content in batch and in a stable manner, and meets the requirements of metal additive manufacturing raw materials.
Description
Technical Field
The invention relates to the technical field of metal powder metallurgy, in particular to a method for preparing GRCop-84 spherical powder based on a VIGA process.
Background
The GRCop-84 alloy is the latest generation hydrogen-oxygen engine inner wall material researched by the national aviation and aerospace agency gurney research center. The Cr and Nb in the GRCop-84 alloy form a Cr2Nb phase with a second phase volume fraction of about 14%, uniformly distributed in the copper matrix, and stable above 1600 ℃. Meanwhile, the large amount of Cr2Nb hardening phase can refine and control the grain size of copper to a great extent, and the strength of the copper alloy can be further improved. The material has excellent conductivity, thermal expansion, strength, creep resistance, ductility, low-frequency fatigue and other properties, has excellent comprehensive properties, and obviously improves the performance of a rocket engine. Based on the excellent performance of the GRCop-84 material, the material is tried to be manufactured into aerospace engine components such as an engine tail nozzle, an engine combustion chamber liner and the like by using an additive manufacturing technology abroad. NASA has begun to develop this additive manufacturing alloy powder for manufacturing rocket combustors since 2014 and has quickly performed hot fire tests on the additive manufactured components. The spherical powder for copper alloy additive manufacturing is strictly controlled abroad, and no export is formed in China.
The metal additive manufacturing has high requirements on powder, such as good powder flowability, reasonable matching of particle diameter and morphology, uniform components, low content of gas elements and the like, and the chemical and physical properties of the powder are required to be stable on the premise of realizing the requirements. The metal powder with fine and narrow particle size, uniform particle size, high sphericity and low oxygen content is the premise and guarantee of metal additive manufacturing metal components with high structural precision and good mechanical property, and meanwhile, the excellent metal powder can also obviously improve the utilization rate of materials, reduce the manufacturing cost and shorten the production period. The preparation idea of the GRCop-84 alloy spherical powder designed by the invention is to prepare the powder by a VIGA (vacuum assisted oxygen gas) process based on meeting the raw material requirements of metal additive manufacturing so as to solve the problem of the domestic preparation of the additive manufacturing raw material of the advanced copper alloy complex cooling structure component of the aerospace engine.
Disclosure of Invention
In view of the problems raised by the above background art, the present invention provides various methods for preparing GRCop-84 spherical powder based on VIGA (vacuum inert gas atomization system) process.
The technical scheme adopted by the invention is as follows:
a method for preparing GRCop-84 spherical powder based on a VIGA process comprises the following steps:
s1, according to mass fraction, the GRCop-84 alloy spherical powder comprises the following main chemical components in percentage by mass: 5-7% of Cr; nb (4.5-6.5)%; the balance of Cu, the alloy component proportion in the range and the best material performance are obtained, simple substances of all elements are added into a crucible to be smelted according to the proportion of all elements, and forging is carried out after casting is finished to obtain a bar blank with the relative density being more than or equal to 90%; the surface of the bar has no obvious defects of looseness, shrinkage cavity and the like;
s2, processing the alloy bar blank into GRCop-84 alloy bar blank meeting the charging size requirement of the vacuum induction melting furnace by using a sawing machine and a lathe;
s3, placing the GRCop-84 bar blank into a crucible in a furnace to be melted, stirring by electromagnetic induction, pre-vacuumizing the whole equipment, and then filling inert protective gas;
s4, pouring the solution into a tundish, keeping the temperature, standing, starting an inert gas heating device, and heating atomized gas;
s5, introducing the metal liquid into an atomization cabin through a flow guide pipe, atomizing and crushing the metal liquid into a large number of fine liquid drops through a nozzle by high-pressure inert gas under the condition that the air pressure is 2-5 MPa, and solidifying the liquid drops into spherical powder particles in the flying process; the air pressure requirement is strictly controlled within the range of 2-5 MPa, the air pressure is too high, the nozzle is abraded, the powder particle size is fine, the ratio of the powder sphericity to the hollow powder is increased, and the air consumption cost is high; the air pressure is too low, so that the nozzle and the flow guide pipe are easily blocked.
S6, obtaining GRCop-84 spherical powder through a powder collecting device, blowing the powder in a low-temperature dry argon environment, standing the powder for post-treatment for 10-20 min, performing ultrasonic oscillation treatment under the condition that the vacuum degree is 0.04Pa, screening the powder to obtain metal powder with various particle sizes, wherein the sphericity reaches 92% -95%, and performing vacuum packaging.
Further, in the scheme, in the step S2, the maximum diameter of the GRCop-84 alloy bar blank is not more than 50mm, the length is 1-600 mm, and the surface roughness is not more than 1.6 μm.
Further, in the foregoing scheme, step S3 specifically includes: putting GRCop-84 bar stock into a graphite crucible coated with a special protective layer, starting a vacuum pumping system until the vacuum degree reaches 1 multiplied by 10-2Pa～10×10-2And when Pa is reached, intermediate frequency heating is started, the raw material is remelted, when the temperature in the ceramic crucible reaches 1600-1800 ℃ and the pressure is-0.1 MPa to-0.05 MPa, the vacuum pumping system is closed, 99.99 percent of high-purity argon is filled, stirring is carried out through electromagnetic induction, and heating is continued until the raw material is in a completely molten state. The melting point of the Cr2Nb phase of the alloy is 1650 ℃, and the superheat degree of the alloy is 100 ℃ and 150 ℃ when the alloy is fully melted; the negative pressure can not only ensure the sealing performance of the whole equipment, but also reduce the vapor pressure and increase the fluidity; inert gas is filled, mainly the inert gas is attached to the surface of the molten liquid, and the liquid surface is prevented from being oxidized; the electromagnetic induction stirring has the function of increasing the fluidity of the molten liquid, fully exhausting gas and simultaneously not introducing other external impurities.
Further, in the above scheme, the professional protective protection layer is an oxidation-resistant and high-temperature-resistant coating, and can be selectively used according to the prior art.
Further, in the foregoing scheme, the step S4 specifically includes: through detection of an infrared temperature measuring instrument, when the superheat degree of GRCop-84 alloy melt reaches 100-150 ℃, pouring a crucible into a tundish above an atomizing nozzle, preserving heat and standing for 5-10 minutes, starting an inert gas heat preservation device at the heat preservation temperature of 1400-1600 ℃, and heating atomizing gas to 300-500 ℃. The heat preservation temperature is 1400 ℃ and 1600 ℃, so that the liquidity of the liquid can be fully ensured, and the honeycomb duct is prevented from being blocked; the advantage or advantage of heating the atomizing gas to 300-500 ℃ is to prevent the honeycomb duct from being blocked due to too fast temperature reduction in the liquid flowing process.
Further, in the above scheme, in the step S5, the inert gas flow is a high-temperature dry mixed gas composed of argon and helium in a volume ratio of 2:1, the temperature of the inert gas flow is 300 to 500 ℃, the flow rate of the inert gas flow is 100 to 300 ℃ mL/min, and the flow ratio of the inert gas to the molten material is 4 to 16: 1. The temperature of the inert gas flow, the flow velocity of the gas flow and the flow ratio of the inert gas to the molten material are determined by the size of a nozzle, the gas pressure, the size of a flow guide pipe, the liquidity of the material liquid, the thermal conductivity of the material liquid, the melting point of the material and other parameters; the device has the advantages of low efficiency due to too low numerical value, nozzle blockage, high oxygen and nitrogen content of powder, high numerical value, high energy consumption, many powder hollow balls and high gas content of powder.
Further, in the scheme, the low-temperature in the step S6 is 10-20 ℃. Blowing air under the argon environment of low-temperature drying can increase the cooling speed of the powder particles and take away the nano-particle dust.
Further, in the above scheme, the frequency of the ultrasonic oscillation in step S6 is 20KHz, and the processing time of the ultrasonic oscillation is 6-10 min. The ultrasound plus vacuum treatment helps to achieve consistent powder particle size and uniform mixing while preventing oxidation and moisture.
Compared with the prior art, the beneficial effects of the invention are embodied in the following points:
firstly, smelting, pouring and forging are carried out firstly to obtain a bar, and then the bar is placed in a crucible again for secondary smelting, so that the gas content of the alloy can be further reduced, the product purity is higher, and fewer impurities are contained;
secondly, the electromagnetic stirring is added in the smelting furnace, so that the homogenization of components and tissues is ensured, the component segregation is reduced, and the exhaust in the smelting process can be increased;
thirdly, the tundish is heated and insulated by medium-frequency induction, the insulation temperature is high, the fluidity of the solution is fully ensured, and the solution can be further discharged by standing;
fourthly, the inert gas is heated when the metal liquid is atomized and crushed, so that the possibility of blocking the nozzle is greatly reduced;
fifthly, the metal liquid is introduced into the atomization chamber through the flow guide pipe, the flow guide pipe is shortened to 5-6cm, which is 2-3cm shorter than the common flow guide pipe, and the phenomena that the liquid temperature is reduced too fast, the high melting point phase is separated out fast, the liquid viscosity is influenced, and the blockage phenomenon occurs are prevented;
and sixthly, the mixed gas of argon and helium is used, so that the heat conduction performance of the gas is improved, the powder is quickly solidified, and the powder cannot be stuck together in the descending process.
Detailed Description
Example 1
A method for preparing GRCop-84 spherical powder based on a VIGA process comprises the following steps:
s1, according to the nominal mass fraction: 5 percent of Cr; 4.5 percent of Nb; the balance of Cu, the raw material proportioning and smelting are carried out, and forging is carried out after casting is finished to obtain a bar blank with the relative density of 92%, wherein the surface of the bar has no obvious defects of shrinkage cavity, looseness and the like;
s2, processing the alloy bar blank into a GRCop-84 alloy bar blank with the maximum external tangent circle diameter of the section of 50mm, the length of 600mm, the surface roughness of less than or equal to 1.6 mu m and meeting the charging size requirement of a vacuum induction melting furnace by using a sawing machine and a lathe;
s3, putting the GRCop-84 bar stock into a graphite crucible coated with an anti-oxidation high-temperature-resistant coating, starting a vacuum pumping system until the vacuum degree reaches 1 x 10-2When Pa, starting intermediate frequency heating, remelting the raw material, when the temperature in the ceramic crucible reaches 1600 ℃ and the pressure is-0.1 Mpa, closing a vacuum pumping system, filling 99.99 percent of high-purity argon, stirring by electromagnetic induction, and continuing heating until the raw material is in a completely molten state;
s4, detecting by an infrared temperature measuring instrument, pouring a crucible into a tundish above an atomizing nozzle when the superheat degree of GRCop-84 alloy melt reaches 100 ℃, preserving heat and standing for 5 minutes, starting an inert gas heat preservation device at the heat preservation temperature of 1400 ℃, and heating atomizing gas to 300 ℃;
s5, introducing the metal liquid into an atomization cabin through a flow guide pipe, atomizing and crushing the metal liquid into a large number of fine liquid drops through a nozzle by high-pressure inert gas under the condition that the air pressure is 2MPa, solidifying the liquid drops into spherical powder particles in the flight process, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in the volume ratio of 2:1, the temperature of the inert gas flow is 300 ℃, the flow rate of the inert gas flow is 100 ℃ mL/min, and the flow ratio of the inert gas to the molten material is 4: 1;
s6, obtaining GRCop-84 spherical powder through a powder collecting device, blowing the powder in a dry argon environment at 10 ℃, standing the powder for post-treatment for 10min, carrying out ultrasonic oscillation treatment under the condition that the vacuum degree is 0.04Pa, wherein the frequency of the ultrasonic oscillation is 20KHz, the treatment time of the ultrasonic oscillation is 6min, sieving the powder to obtain metal powder with various particle sizes, wherein the particle size is less than or equal to 15 mu m and accounts for 10%, the particle size is 15 mu m to 70 mu m and accounts for 34%, the particle size is 70 mu m to 150 mu m and accounts for 50%, the particle size is more than or equal to 150 mu m and accounts for 6%, the sphericity reaches 92%, and carrying out vacuum packaging.
Example 2
A method for preparing GRCop-84 spherical powder based on a VIGA process comprises the following steps:
s1, according to the nominal mass fraction: 6) percent of Cr; 5 percent of Nb; the balance of Cu, the raw material proportioning and smelting are carried out, and the bar stock with the relative density of 94 percent is obtained by forging after the pouring, and the surface of the bar stock has no obvious defects of shrinkage cavity, looseness and the like;
s2, processing the alloy bar blank into a GRCop-84 alloy bar blank with the maximum external tangent circle diameter of the section of 50mm, the length of 600mm, the surface roughness of less than or equal to 1.6 mu m and meeting the charging size requirement of a vacuum induction melting furnace by using a sawing machine and a lathe;
s3, putting the GRCop-84 bar stock into a graphite crucible coated with an anti-oxidation high-temperature-resistant coating, starting a vacuum pumping system until the vacuum degree reaches 6 multiplied by 10-2When Pa, starting intermediate frequency heating, remelting the raw materials, when the temperature in the ceramic crucible reaches 1750 ℃ and the pressure is-0.07 Mpa, closing a vacuum pumping system, filling 99.99 percent of high-purity argon, stirring by electromagnetic induction, and continuously heating until the raw materials are in a completely molten state;
s4, detecting by an infrared temperature measuring instrument, pouring a crucible into a tundish above an atomizing nozzle when the superheat degree of GRCop-84 alloy melt reaches 130 ℃, preserving heat and standing for 8 minutes, starting an inert gas heat preservation device at the heat preservation temperature of 1550 ℃, and heating atomizing gas to 450 ℃;
s5, introducing the metal liquid into an atomization cabin through a flow guide pipe, atomizing and crushing the metal liquid into a large number of fine liquid drops through a nozzle by high-pressure inert gas under the condition that the air pressure is 2.5MPa, solidifying the liquid drops into spherical powder particles in the flight process, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in the volume ratio of 2:1, the temperature of the inert gas flow is 450 ℃, the flow rate of the gas flow is 150 ℃ mL/min, and the flow ratio of the inert gas to the molten material is 6: 1;
s6, obtaining GRCop-84 spherical powder through a powder collecting device, blowing the powder in a dry argon environment at 12 ℃, standing the powder for post-treatment for 10min, carrying out ultrasonic oscillation treatment under the condition that the vacuum degree is 0.04Pa, wherein the frequency of the ultrasonic oscillation is 20KHz, the treatment time of the ultrasonic oscillation is 10min, sieving the powder to obtain metal powder with various particle sizes, wherein the particle size is less than or equal to 15 mu m and accounts for 8%, the particle size is 15 mu m to 70 mu m and accounts for 38%, the particle size is 70 mu m to 150 mu m and accounts for 52%, the particle size is more than or equal to 150 mu m and accounts for 2%, the spherical rate reaches 95%, and carrying out vacuum packaging.
Example 3
A method for preparing GRCop-84 spherical powder based on a VIGA process comprises the following steps:
s1, according to the nominal mass fraction: 7 percent of Cr; 6.5 percent of Nb; the balance of Cu, the raw material proportioning and smelting are carried out, and the forging is carried out after the pouring is finished to obtain a bar blank with the relative density of more than or equal to 90 percent, wherein the surface of the bar has no obvious defects of shrinkage cavity, looseness and the like;
s2, processing the alloy bar blank into a GRCop-84 alloy bar blank with the maximum external tangent circle diameter of 50mm, the length of 500mm, the surface roughness of less than or equal to 1.6 mu m and meeting the charging size requirement of a vacuum induction melting furnace by using a sawing machine and a lathe;
s3, putting the GRCop-84 bar stock into a graphite crucible coated with an anti-oxidation high-temperature-resistant coating, starting a vacuum pumping system until the vacuum degree reaches 10 multiplied by 10-2When Pa is needed, the medium-frequency heating is started, the raw material is remelted, when the temperature in the ceramic crucible reaches 1800 ℃ and the pressure is-0.1 Mpa, the vacuum pumping system is closed, and 99.99 percent of the raw material is filledHigh-purity argon gas is stirred through electromagnetic induction, and the heating is continued until the raw materials are in a completely molten state;
s4, detecting by an infrared temperature measuring instrument, pouring a crucible into a tundish above an atomizing nozzle when the superheat degree of GRCop-84 alloy melt reaches 150 ℃, preserving heat and standing for 10 minutes, starting an inert gas heat preservation device at the heat preservation temperature of 1600 ℃, and heating atomizing gas to 500 ℃;
s5, introducing the metal liquid into an atomization cabin through a draft tube, atomizing and crushing the metal liquid into a large number of fine liquid drops through a nozzle by high-pressure inert gas under the condition that the air pressure is 5MPa, solidifying the liquid drops into spherical powder particles in the flight process, wherein the inert gas flow is high-temperature dry mixed gas consisting of argon and helium in the volume ratio of 2:1, the temperature of the inert gas flow is 500 ℃, the flow rate of the inert gas flow is 300 ℃ mL/min, and the flow ratio of the inert gas to the molten material is 16: 1;
s6, obtaining GRCop-84 spherical powder through a powder collecting device, blowing the powder in a dry argon environment at 20 ℃, standing the powder for post-treatment for 20min, carrying out ultrasonic oscillation treatment under the condition that the vacuum degree is 0.04Pa, wherein the frequency of the ultrasonic oscillation is 20KHz, the treatment time of the ultrasonic oscillation is 10min, sieving the powder to obtain metal powder with various particle sizes, wherein the particle size is less than or equal to 15 mu m and accounts for 12%, the particle size is 15 mu m to 70 mu m and accounts for 40%, the particle size is 70 mu m to 150 mu m and accounts for 43%, the particle size is more than or equal to 150 mu m and accounts for 5%, the sphericity reaches 93.6%, and carrying out vacuum packaging.
Claims (8)
1. A method for preparing GRCop-84 spherical powder based on a VIGA process is characterized by comprising the following steps:
s1, according to mass fraction, the GRCop-84 alloy spherical powder comprises the following main chemical components in percentage by mass: 5-7% of Cr; nb (4.5-6.5)%; adding the elementary substances of the elements into a crucible according to the proportion of the elements for smelting, and forging after casting to obtain a bar blank with the relative density of more than or equal to 90 percent;
s2, processing the alloy bar blank into GRCop-84 alloy bar blank meeting the charging size requirement of the vacuum induction melting furnace by using a sawing machine and a lathe;
s3, placing the GRCop-84 bar blank into a crucible in a furnace to be melted, stirring by electromagnetic induction, pre-vacuumizing the whole equipment, and then filling inert protective gas;
s4, pouring the solution into a tundish, keeping the temperature, standing, starting an inert gas heating device, and heating atomized gas;
s5, introducing the metal liquid into an atomization cabin through a flow guide pipe, atomizing and crushing the metal liquid into a large number of fine liquid drops through a nozzle by high-pressure inert gas under the condition that the air pressure is 2-5 MPa, and solidifying the liquid drops into spherical powder particles in the flying process;
s6, obtaining GRCop-84 spherical powder through a powder collecting device, blowing the powder in a low-temperature dry argon environment, standing the powder, performing ultrasonic oscillation treatment under the condition that the vacuum degree is 0.04Pa, screening the powder to obtain metal powder with various particle sizes, wherein the sphericity rate reaches 92% -95%, and performing vacuum packaging.
2. The method for preparing GRCop-84 spherical powder based on the VIGA process in claim 1, wherein in step S2, the GRCop-84 alloy bar stock has a maximum diameter of not more than 50mm, a length of 1-600 mm, and a surface roughness of not more than 1.6 μm.
3. The method for preparing GRCop-84 spherical powder based on VIGA process of claim 1, wherein the step S3 specifically comprises: putting GRCop-84 bar stock into a graphite crucible coated with a special protective layer, starting a vacuum pumping system until the vacuum degree reaches 1 multiplied by 10-2Pa～10×10-2And when Pa is reached, intermediate frequency heating is started, the raw material is remelted, when the temperature in the ceramic crucible reaches 1600-1800 ℃ and the pressure is-0.1 MPa to-0.05 MPa, the vacuum pumping system is closed, 99.99 percent of high-purity argon is filled, stirring is carried out through electromagnetic induction, and heating is continued until the raw material is in a completely molten state.
4. The method for preparing GRCop-84 spherical powder based on VIGA process of claim 3, wherein said specialized protective layer is an oxidation-resistant and high temperature-resistant coating.
5. The method for preparing GRCop-84 spherical powder based on VIGA process of claim 1, wherein the step S4 specifically comprises: through detection of an infrared temperature measuring instrument, when the superheat degree of GRCop-84 alloy melt reaches 100-150 ℃, pouring a crucible into a tundish above an atomizing nozzle, preserving heat and standing for 5-10 minutes, starting an inert gas heat preservation device at the heat preservation temperature of 1400-1600 ℃, and heating atomizing gas to 300-500 ℃.
6. The method for preparing GRCop-84 spherical powder based on the VIGA process of claim 1, wherein in step S5, the inert gas flow is a high-temperature dry mixed gas composed of argon and helium in a volume ratio of 2:1, the temperature of the inert gas flow is 300-500 ℃, the flow rate of the inert gas flow is 100-300 ℃ mL/min, and the flow ratio of the inert gas to the molten material is 4-16: 1.
7. The method for preparing GRCop-84 spherical powder based on VIGA process of claim 1, wherein in step S6, the low temperature is 10-20 ℃.
8. The method for preparing GRCop-84 spherical powder based on VIGA process of claim 1, wherein in step S6, the frequency of ultrasonic oscillation is 20KHz, and the processing time of ultrasonic oscillation is 6-10 min.
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| CN114293064A (en) * | 2022-03-09 | 2022-04-08 | 北京科技大学 | High-strength high-conductivity high-temperature-resistant Cu-Cr-Nb alloy and preparation method thereof |
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