CN109351982A - A kind of continuous production chromiumcopper milling method - Google Patents
A kind of continuous production chromiumcopper milling method Download PDFInfo
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- CN109351982A CN109351982A CN201811393159.9A CN201811393159A CN109351982A CN 109351982 A CN109351982 A CN 109351982A CN 201811393159 A CN201811393159 A CN 201811393159A CN 109351982 A CN109351982 A CN 109351982A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- B22F2009/0836—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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- 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
- B22F2009/0844—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 in controlled atmosphere
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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
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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
- B22F2009/0888—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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- 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
- B22F2009/0896—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
Abstract
The invention discloses a kind of continuous production chromiumcopper milling methods, comprising the following steps: (1) according to the chromium of weight ratio 0.7%~40%, copper surplus is respectively charged into ceramic crucible and is melted, and is stirred by electromagnetic induction；(2) metal liquid atomization is broken into a large amount of tiny drops, induction heating is carried out to flow-guiding mouth, melt is flowed out by ceramic crucible bottom flow-guiding mouth, repeats powder by atomization process；(3) tiny drop is awing frozen into spherical and sub- spheric granules, then screened from reaching the metal powder for preparing various granularities.The present invention carries out heating fusing by electromagnetic induction, is stirred with electromagnetic induction, is atomized using fast gas, so that chromiumcopper forms droplet and cools down rapidly, avoids the copper chromium two-phase laminated flow in solid-state.
Description
Technical field
The invention belongs to field of alloy preparation technology, are specifically related to a kind of continuous production chromiumcopper milling method.
Background technique
Vacuum electromagnetic induction melting: so that the magnetic preferable material of sense is obtained induced current by electromagnetic induction principle, reach
A kind of technology of the purpose of heating.Electric current passes through the electromagnetic coil that is looped around around metal material, the electric current of variation with certain frequency
Induced magnetic field is generated, and makes metal inside generate induced current, and generate a large amount of heat, is used to heating material.It crosses herein
Cheng Zhong, since whole process occurs under vacuum conditions, be conducive to dispelling for metal inside gaseous impurity, obtained gold
It is purer to belong to alloy material.In fusion process, because the metal material of liquid is in crucible the characteristics of Induction Melting Technology
Stirring can be realized automatically due to the interaction by electromagnetic force in portion, keeps ingredient more uniform.
Powder by atomization method: being first the aluminium alloy of ingredient qualification by raw metal melting when powder by atomization with electric furnace or induction furnace
Body (generally overheats 100~150 DEG C), is then injected into the tundish on atomizer.Aluminium alloy is by tundish
Eye outflow is leaked in bottom, meets when passing through nozzle with high-speed flow or water flow and is atomized as fine drop, atomized drop is closed
Alloy powder is rapidly solidificated into atomizing cup.Each particle of this powder not only has identical with set molten alloy
Even chemical component, and crystalline texture has been refined due to quick freezing action；Eliminate the gross segregation of the second phase.
It uses graphite crucible for chromiumcopper carrier using traditional in the prior art, reacts shape there are chromium and carbon
At the harm of impurity；It cannot achieve consecutive production；Copper, chromium two-phase are there are density contrast, and fusion process must stir, otherwise easily
Cause uneven components；Chromiumcopper rapid heat dissipation, poor fluidity, easily blocking runner, nozzle；When chromium content is in 0.7%-
Between 40%, if cooling slow, two-phase laminated flow.
Summary of the invention
Against the above technical problems, the present invention, which provides, uses vacuum induction melting mode, be ensure that into using electromagnetic agitation
The uniformity divided removes intermediate packet procedures, so that vacuum induction melting and vacuum by shortening conventional vacuum powder by atomization process
Powder by atomization effectively combines, and avoids chromiumcopper melt in flow process blocking as caused by heat dissipation and cooled causes slowly
Segregation phenomena continuous production chromiumcopper powder-making technique.
The technical scheme is that a kind of continuous production chromiumcopper milling method, comprising the following steps:
(1) vacuum induction melting: material composition and its weight percent: chromium 0.7%~40%, copper surplus, vacuum aerosol
The vacuum induction melting part for changing powder manufacturing apparatus, is disposed with multiple induction heating units, and each unit is equipped with a ceramic earthenware
Crucible is packed into material requested in ceramic crucible respectively, starts vacuum-pumping system, until vacuum degree reaches 10-3Pa~10-1Pa,
By the way of the gradient increased wattage heating of intermediate frequency electromagnetic induction, so that the gas in raw material further discharges, work as ceramics
When crucible chinese raw materials temperature reaches 1000~1200 DEG C, vacuum-pumping system is closed, in -0.09Mpa~-0.06Mpa condition
Under, it is filled with inert gas, and stir by electromagnetic induction, continues heating until raw material are in molten state；
(2) powder by atomization: being detected by infrared measurement of temperature instrument, to the chromiumcopper melt degree of superheat reach 50~200 DEG C it
Between, remove ceramic crucible bottom stopper, so that chromiumcopper melt is directly over the flow-guiding mouth below ceramic crucible and flows downward out,
Under the conditions of air pressure is 2~30MPa, metal liquid atomization is broken into a large amount of tiny liquid by nozzle by high pressure inert air-flow
Drop waits after melt stream is complete in the unit, carries out induction heating to flow-guiding mouth, prevents from blocking, while shaft rotates, next induction
Ceramic crucible is docked with flow-guiding mouth in heating unit, carries out induction heating stopping to flow-guiding mouth, melt is led by ceramic crucible bottom
Stem bar outflow, repeats powder by atomization process；
(3) cooling screening: tiny drop is awing frozen into spherical and sub- spheric granules, then screened from reaching system
The metal powder of standby various granularities；The spherical rate of metal powder after molding reaches 95%~99%, and the particle size of powder
Respectively less than 60 μm.
Further, the mode that gradient increased wattage heats in step (1): the first stage, control power 800~
1000Hz, carries out 10~20min of heat treatment, second stage, control power in 1200~1400Hz, carry out heat treatment 15~
25min, 12~18min of isothermal holding, the phase III, control power in 1800~2000Hz, carry out heat treatment 30~
35min guarantees that the gas in raw material constantly changes the heating temperature of raw material in such a way that gradient power heats, is conducive to
Metal inside gaseous impurity is dispelled, and obtained metal alloy compositions are purer.
Further, when step (1) carries out electromagnetic induction stirring, first controlling stirring rate is 800~1200r/min, is stirred
Mixing the time is 5~7min, then with the rate reduction of speed of 10~20r/min to 600~1000r/min, mixing time is 8~
12min, then controlling stirring rate is 1100~1400r/min, and mixing time is 4~6min, when metal becomes liquid, gold
Dispersion imperfect flow is poor between category liquid, by the continuous speed-adjustable stir of electromagnetic induction, adjusts the viscosity of chromiumcopper, energy
Enough mixed types guaranteed between the two raw material, guarantee to be uniformly dispersed.
Further, step (1) inert gas is the dry gas of one of argon gas, helium, Krypton or a variety of compositions,
Raw material in heating process is protected.
Further, when progress high pressure inert aerodynamic atomization is broken in step (2), it is 1.5 that inert gas, which is by volume ratio:
The mixed gas of the low temperature drying of 1 argon gas and helium composition, the temperature of inert gas are 6~8 DEG C, air-flow flow rate is 100~
130mL/min, avoid preventing copper, chromium two-phase separated in solid-state and it is cooled it is slow caused by segregation phenomena.
Further, before step (3) is sieved, spherical and sub- spheric granules first is frozen into low temperature drying by what is obtained
Nitrogen environment under carry out wind, cryogenic temperature is 10~12 DEG C, and gas flow rate is 150~180sccm, stewing process 10~
15min, then supersonic frequency be 20~30KHz, vacuum degree be 0.04~0.06MPa under the conditions of, handle 6~10min, pass through vibration
It swings, is sieved, can have identical evening chemical ingredient in the particle of ground guarantee formation.
Further, it when step (3) is sieved, is sieved by screening film to spherical and sub- spheric granules is frozen into
Reach the metal powder for preparing various granularities out；The preparation method of the screening film, comprising the following steps: to polyethylene glycol micro-
Under conditions of wave frequency rate is 350~500MHz, diamondite is added, handles 12~18min；It is again 35 DEG C in temperature, vacuum
Degree is vacuum defoamation 1.2h under conditions of 0.01~0.2MPa, and the mixed liquor that tungsten carbide concentration is 0.3~0.5g/mL is made；So
Afterwards in the protection atmosphere for being made of mixed gas argon gas and nitrogen that volume ratio is 1:1.2, the condition that temperature is 200~300 DEG C
Under, 5~10s, cooling room temperature are handled to foam metal tin matrix pulse；By foam metal matrix after mixed liquor and processing in pressure
25~45min is handled under conditions of centrifugation rate is 2800~3000r/min for 0.1~0.2MPa, obtains semi-finished product screening
Film, by supersonic frequency be 15~25KHz under the conditions of, decentralized processing；By vacuum drying treatment after the completion of processing, burnt
Knot processing obtains screening film；Stomata auxiliary agent by the way that different micron levels are added carries out membrane aperture adjusting, obtains to be used
Grain screening film.
Beneficial effects of the present invention: the present invention uses ceramic crucible, avoids the reaction of carbon and chromium, while closing in view of copper chromium
Golden uniformity is poor, poor radiation, poor fluidity, is easy to the characteristics of being segregated, and optimization shortens conventional vacuum gas atomization process,
Cancel conventional vacuum gas atomization process molten metal and this process of nozzle is flowed through by tundish, so that vacuum induction melting
Effectively combined with vacuum gas atomization, ensure that the uniformity of melt ingredient by induction melting, and due to eliminating in
Between wrap this process, effectively prevent chromiumcopper melt due to rapid heat dissipation cause block runner, nozzle the phenomenon that, pass through simultaneously
The cooling mode of high-speed flow, prevents copper, the separation in solid-state of chromium two-phase, and screening film can reduce filtrate by pressure, mention
Filtration efficiency effectively controls the size of material granule by sieving film, and the present invention realizes continuous batch production.
Specific embodiment
Embodiment 1
A kind of continuous production chromiumcopper milling method, comprising the following steps:
(1) vacuum induction melting: material composition and its weight percent: chromium 0.7%, copper surplus, vacuum gas-atomized powder
The vacuum induction melting part of equipment is disposed with multiple induction heating units, and each unit is equipped with a ceramic crucible, respectively
It is packed into material requested in ceramic crucible, starts vacuum-pumping system, until vacuum degree reaches 10-1Pa, using medium frequency electric magnetic strength
The gradient increased wattage heating answered, first stage, control power carry out heat treatment 10min, second stage, control in 800Hz
Power carries out heat treatment 15min, isothermal holding 12min in 1200Hz, and the phase III controls power in 1800Hz, added
It is heat-treated 30min, so that the gas in raw material further discharges, when ceramic crucible chinese raw materials temperature reaches 1000 DEG C,
Vacuum-pumping system is closed, under the conditions of -0.09MpaMpa, is filled with argon gas, and stir by electromagnetic induction, first control stirring speed
Rate is 800r/min, mixing time 5min, then with the rate reduction of speed of 10r/min to 600r/min, mixing time 8min,
Then control stirring rate is 1100r/min, mixing time 4min, continues heating until raw material are in molten state；
(2) powder by atomization: being detected by infrared measurement of temperature instrument, is reached between 50 DEG C to the chromiumcopper melt degree of superheat, is gone
Fall ceramic crucible bottom stopper, so that chromiumcopper melt is directly over the flow-guiding mouth below ceramic crucible and flows downward out, in gas
Under the conditions of pressure is 2MPa, metal liquid atomization is broken into a large amount of tiny drops, inertia by nozzle by high-pressure inert gas
The mixed gas for the high temperature drying that air-flow is made of the argon gas that volume ratio is 1.5:1 and helium, the temperature of inert gas are 6
DEG C, air-flow flow rate is 100mL/min, is waited after melt stream is complete in the unit, carries out induction heating to flow-guiding mouth, prevents from blocking, together
When shaft rotate, ceramic crucible is docked with flow-guiding mouth in next induction heating unit, to flow-guiding mouth progress induction heating stopping,
Melt is flowed out by ceramic crucible bottom flow-guiding mouth, repeats powder by atomization process；
(3) cooling screening: tiny drop is awing frozen into spherical and sub- spheric granules, in the nitrogen of low temperature drying
Wind is carried out under environment, cryogenic temperature is 10 DEG C, gas flow rate 150sccm, stewing process 10min, then is in supersonic frequency
20KHz handles 6min under the conditions of vacuum degree is 0.04MPa, by oscillation, then it is screened from reaching the gold for preparing various granularities
Belong to powder, spherical rate reaches 95%, and particle size is less than 60 μm.
Embodiment 2
A kind of continuous production chromiumcopper milling method, comprising the following steps:
(1) vacuum induction melting: material composition and its weight percent: chromium 30%, copper surplus, vacuum gas-atomized powder are set
Standby vacuum induction melting part, is disposed with multiple induction heating units, and each unit is equipped with a ceramic crucible, exists respectively
It is packed into material requested in ceramic crucible, starts vacuum-pumping system, until vacuum degree reaches 10-2Pa is incuded using intermediate frequency electromagnetic
The heating of gradient increased wattage, the first stage, control power carries out heat treatment 15min in 900Hz, and second stage controls function
Rate carries out heat treatment 20min, isothermal holding 15min in 1300Hz, and the phase III controls power in 1900Hz, heated
33min is handled, so that the gas in raw material further discharges, when ceramic crucible chinese raw materials temperature reaches 1100 DEG C, is closed
Vacuum-pumping system is closed, under the conditions of -0.08Mpa, is filled with the mixed gas according to helium and Krypton that volume ratio is 1:1, and
It is stirred by electromagnetic induction, first controlling stirring rate is 1000r/min, mixing time 6min, then with the rate of 15r/min
For reduction of speed to 800r/min, mixing time 10min, then controlling stirring rate is 1200r/min, mixing time 5min, after
Continuous heating is until raw material are in molten state；
(2) powder by atomization: being detected by infrared measurement of temperature instrument, is reached between 170 DEG C to the chromiumcopper melt degree of superheat, is gone
Fall ceramic crucible bottom stopper, so that chromiumcopper melt is directly over the flow-guiding mouth below ceramic crucible and flows downward out, in gas
Under the conditions of pressure is 15MPa, metal liquid atomization is broken into a large amount of tiny drops, inertia by nozzle by high-pressure inert gas
The mixed gas for the high temperature drying that air-flow is made of the argon gas that volume ratio is 1.5:1 and helium, the temperature of inert gas are 7
DEG C, air-flow flow rate is 120mL/min, is waited after melt stream is complete in the unit, carries out induction heating to flow-guiding mouth, prevents from blocking, together
When shaft rotate, ceramic crucible is docked with flow-guiding mouth in next induction heating unit, to flow-guiding mouth progress induction heating stopping,
Melt is flowed out by ceramic crucible bottom flow-guiding mouth, repeats powder by atomization process；
(3) cooling screening: tiny drop is awing frozen into spherical and sub- spheric granules, in the nitrogen of low temperature drying
Wind is carried out under environment, cryogenic temperature is 11 DEG C, gas flow rate 160sccm, stewing process 13min, then is in supersonic frequency
25KHz handles 8min under the conditions of vacuum degree is 0.05MPa, by oscillation, then it is screened from reaching the gold for preparing various granularities
Belong to powder, spherical rate reaches 96%, and particle size is less than 60 μm.
Embodiment 3
A kind of continuous production chromiumcopper milling method, comprising the following steps:
(1) vacuum induction melting: material composition and its weight percent: chromium 40%, copper surplus, vacuum gas-atomized powder are set
Standby vacuum induction melting part, is disposed with multiple induction heating units, and each unit is equipped with a ceramic crucible, exists respectively
It is packed into material requested in ceramic crucible, starts vacuum-pumping system, until vacuum degree reaches 10-3Pa is incuded using intermediate frequency electromagnetic
The heating of gradient increased wattage, the first stage, control power carries out heat treatment 20min, second stage, control in 1000Hz
Power carries out heat treatment 25min, isothermal holding 18min in 1400Hz, and the phase III controls power in 2000Hz, added
It is heat-treated 35min, so that the gas in raw material further discharges, when ceramic crucible chinese raw materials temperature reaches 1200 DEG C,
Vacuum-pumping system is closed, under the conditions of -0.06Mpa, is filled with according to argon gas, Krypton and the helium that volume ratio is 1.5:1:1
Mixed gas, and by electromagnetic induction stir, first control stirring rate be 1200r/min, mixing time 7min, then with
For the rate reduction of speed of 20r/min to 1000r/min, mixing time 12min, then controlling stirring rate is 1400r/min, stirring
Time is 6min, continues heating until raw material are in molten state；
(2) powder by atomization: being detected by infrared measurement of temperature instrument, is reached between 200 DEG C to the chromiumcopper melt degree of superheat, is gone
Fall ceramic crucible bottom stopper, so that chromiumcopper melt is directly over the flow-guiding mouth below ceramic crucible and flows downward out, in gas
Under the conditions of pressure is 30MPa, metal liquid atomization is broken into a large amount of tiny drops, inertia by nozzle by high-pressure inert gas
The mixed gas for the high temperature drying that air-flow is made of the argon gas that volume ratio is 1.5:1 and helium, the temperature of inert gas are 8
DEG C, air-flow flow rate is 130mL/min, is waited after melt stream is complete in the unit, carries out induction heating to flow-guiding mouth, prevents from blocking, together
When shaft rotate, ceramic crucible is docked with flow-guiding mouth in next induction heating unit, to flow-guiding mouth progress induction heating stopping,
Melt is flowed out by ceramic crucible bottom flow-guiding mouth, repeats powder by atomization process；
(3) cooling screening: tiny drop is awing frozen into spherical and sub- spheric granules, in the nitrogen of low temperature drying
Wind is carried out under environment, cryogenic temperature is 12 DEG C, gas flow rate 180sccm, stewing process 15min, then is in supersonic frequency
30KHz under the conditions of vacuum degree is 0.06MPa, handles 10min, then the separation of screened diaphragm screen reaches the metal for preparing various granularities
Powder, spherical rate reach 99%, and particle size is less than 60 μm；The preparation method of above-mentioned screening film, comprising the following steps: to poly- second
Diamondite is added under conditions of microwave frequency is 500MHz in glycol, handles 18min；It is again 35 DEG C in temperature, vacuum degree
For vacuum defoamation 1.2h under conditions of 0.2MPa, the mixed liquor that tungsten carbide concentration is 0.5g/mL is made；Then it is being by volume ratio
The protection atmosphere of argon gas and nitrogen the composition mixed gas of 1:1.2, under conditions of temperature is 300 DEG C, to foam metal tin matrix
Pulse handles 10s, cooling room temperature；It in pressure is 0.2MPa by foam metal matrix after mixed liquor and processing, centrifugation rate is
Under conditions of 3000r/min, 45min is handled, semi-finished product screening film is obtained, by dispersing under the conditions of supersonic frequency is 25KHz
Processing；It by vacuum drying treatment after the completion of processing, is sintered, obtains screening film；By the way that different micron levels are added
Stomata auxiliary agent carry out membrane aperture adjusting, obtain particle screening film to be used.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (6)
1. a kind of continuous production chromiumcopper milling method, which comprises the following steps:
(1) vacuum induction melting: material composition and its weight percent: chromium 0.7%~40%, copper surplus, vacuum aerosolization system
The vacuum induction melting part of powder equipment is disposed with multiple induction heating units, and each unit is equipped with a ceramic crucible, point
Material requested is not packed into ceramic crucible, starts vacuum-pumping system, until vacuum degree reaches 10-1Pa~10-3Pa is used
The mode of the gradient increased wattage heating of intermediate frequency electromagnetic induction works as ceramic crucible so that the gas in raw material further discharges
When chinese raw materials temperature reaches 1000~1200 DEG C, closes vacuum-pumping system and filled under the conditions of -0.09Mpa~-0.06Mpa
Enter inert gas, and stirred by electromagnetic induction, continues heating until raw material are in molten state；
(2) powder by atomization: being detected by infrared measurement of temperature instrument, is reached between 50~200 DEG C to the chromiumcopper melt degree of superheat, is gone
Fall ceramic crucible bottom stopper, so that chromiumcopper melt is directly over the flow-guiding mouth below ceramic crucible and flows downward out, in gas
Under the conditions of pressure is 2~30MPa, metal liquid atomization is broken into a large amount of tiny drops by nozzle by high pressure inert air-flow,
Deng melt stream in the unit it is complete after, induction heating is carried out to flow-guiding mouth, prevents from blocking, while shaft rotates, next induction plus
Ceramic crucible is docked with flow-guiding mouth in hot cell, carries out induction heating stopping to flow-guiding mouth, melt is by ceramic crucible bottom water conservancy diversion
Mouth outflow, repeats powder by atomization process；
(3) cooling screening: tiny drop is awing frozen into spherical and sub- spheric granules, then screened each from preparation is reached
The metal powder of kind granularity.
2. a kind of continuous production chromiumcopper milling method as described in claim 1, which is characterized in that in the step (1)
The mode of gradient increased wattage heating: the first stage controls power in 800~1000Hz, carries out 10~20min of heat treatment,
Second stage controls power in 1200~1400Hz, carries out 15~25min of heat treatment, 12~18min of isothermal holding, third
Stage controls power in 1800~2000Hz, carries out 30~35min of heat treatment.
3. a kind of continuous production chromiumcopper milling method as described in claim 1, which is characterized in that the step (1) into
When row electromagnetic induction stirs, first controlling stirring rate is 800~1200r/min, and mixing time is 5~7min, then with 10~
For the rate reduction of speed of 20r/min to 600~1000r/min, mixing time is 8~12min, then control stirring rate be 1100~
1400r/min, mixing time are 4~6min.
4. a kind of continuous production chromiumcopper milling method as described in claim 1, which is characterized in that in the step (1)
Inert gas is the dry gas of one of argon gas, helium, Krypton or a variety of compositions.
5. a kind of continuous production chromiumcopper milling method as described in claim 1, which is characterized in that in the step (2)
When progress high pressure inert aerodynamic atomization is broken, inert gas is done by the high temperature that the argon gas that volume ratio is 1.5:1 and helium form
Dry mixed gas, the temperature of inert gas are 6~8 DEG C, and air-flow flow rate is 100~130mL/min.
6. a kind of continuous production chromiumcopper milling method as described in claim 1, which is characterized in that the step (3) into
Before row screening, the obtained spherical and sub- spheric granules that is frozen into first is subjected to wind, low temperature under the nitrogen environment of low temperature drying
Temperature be 10~12 DEG C, gas flow rate be 150~180sccm, 10~15min of stewing process, then supersonic frequency be 20~
30KHz handles 6~10min under the conditions of vacuum degree is 0.04~0.06MPa, by oscillation, is sieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811393159.9A CN109351982B (en) | 2018-11-21 | 2018-11-21 | Powder making method for continuously producing copper-chromium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811393159.9A CN109351982B (en) | 2018-11-21 | 2018-11-21 | Powder making method for continuously producing copper-chromium alloy |
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| CN109943746A (en) * | 2019-04-20 | 2019-06-28 | 陕西斯瑞新材料股份有限公司 | A kind of preparation method of Ultra-fine 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 |
| 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 |
| CN111719087A (en) * | 2020-05-19 | 2020-09-29 | 陕西斯瑞新材料股份有限公司 | Preparation method of medical CuFe alloy powder |
| CN111822725A (en) * | 2020-09-21 | 2020-10-27 | 陕西斯瑞新材料股份有限公司 | Preparation method of alloy powder for recycling copper-chromium alloy |
| WO2021028477A1 (en) * | 2019-08-15 | 2021-02-18 | Ald Vacuum Technologies Gmbh | Method and device for breaking up an electrically conductive liquid |
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| 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 |
| CN111719087A (en) * | 2020-05-19 | 2020-09-29 | 陕西斯瑞新材料股份有限公司 | Preparation method of medical CuFe alloy powder |
| 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 |
| CN111822725A (en) * | 2020-09-21 | 2020-10-27 | 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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