CN105655080B - A kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material - Google Patents
A kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material Download PDFInfo
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- CN105655080B CN105655080B CN201610007604.8A CN201610007604A CN105655080B CN 105655080 B CN105655080 B CN 105655080B CN 201610007604 A CN201610007604 A CN 201610007604A CN 105655080 B CN105655080 B CN 105655080B
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15341—Preparation processes therefor
- H01F1/1535—Preparation processes therefor by powder metallurgy, e.g. spark erosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15358—Making agglomerates therefrom, e.g. by pressing
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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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The present invention relates to a kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material, belong to soft magnetic materials preparation field.This method is added to soft magnetism raw material using ceramic powders, nano-amorphous powder is made through spraying and powder making, high resistivity Fe-Base nanocrystalline soft magnetic material is obtained finally by discharge plasma sintering legal system, wherein it is low both to have solved conventional soft magnetic materials resistivity for the addition of ceramic powders, the defects of high energy consumption, also uprise soft magnetic materials intensity, simultaneously nanocrystalline non crystalline structure is more excellent by the combination property of soft magnetic materials, make it have high saturated magnetic induction, high magnetic permeability, low-loss, the characteristics such as low cost, electronic component can be made greater efforts to promote to high frequency, lightweight direction is developed.
Description
Technical field
The present invention relates to a kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material, belongs to soft magnetic materials and prepares neck
Domain.
Background technology
As the progress of science and technology, the development of society and the rise of emerging field, people grind for various high performance materials
Study carefully and also deepen continuously.Magnetic material can realize the conversion, storage and transmission of energy and information as a kind of important functional material
Deng critical function, the various fields such as its application covering energy, electrical equipment, electronics take on key player in social development.Magnetic
Material can be divided into soft magnetic materials, permanent-magnet material, piezomagnetic material and gyromagnetism material etc..Soft magnetic materials is as one in magnetic material
Kind, there is the good characteristics such as high saturation flux, high magnetic conductance, low-loss, the extensive application in industry and daily life can
For manufacturing the electronic components such as motor, transformer, transformer, computer magnetic core, magnetic recording head.
The development course of soft magnetic materials experienced from pure iron, mild steel, iron Si system alloy, iron aluminum series alloy, iron sial system
The crystalline state soft magnetic materials such as alloy, nickel iron-based alloy, to the amorphous soft magnetic material and crystalline state nanometer soft magnetism developed rapidly in recent years
Material.The amorphous nanocrystalline soft magnetic material that twentieth century end grows up is such as high full because it has excellent synthesis soft magnet performance
With the characteristic such as magnetic induction intensity, high magnetic permeability, low-loss, low cost, the electronic component that can make greater efforts to promote is to high frequency, lightweight
Direction is developed, and has become the focus of countries in the world focus of attention.
Non-crystaline amorphous metal is a kind of new material, because it has the performance more excellent than Conventional alloys in many aspects, not only
With high intensity, hardness, toughness, wearability, corrosion resistance and higher resistive, but also show excellent soft magnetism, low
The features such as magnetic loss, it is widely used in industries such as electronics, machinery, chemical industry, and enters one with to non-crystaline amorphous metal
Step is studied and constantly expands its application.
The magnetic property of soft magnetic materials in itself is fine, such as with very high magnetic induction intensity and magnetic conductivity etc..Shortcoming is same
Substantially, because soft magnetic materials is made up of metal, its resistivity must be very low, and low resistivity is coming for high energy losses
Source.Energy loss turns into the biggest obstacle of the application of limitation soft magnetic materials and development.
The content of the invention
Present invention mainly solves technical problem：All it is made up of for current conventional soft magnetic materials metal, therefore resistance
Rate is all very low, and low resistivity can cause very high energy loss, turns into the application of limitation soft magnetic materials and development biggest obstacle
Present situation, there is provided a kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material, this method utilize ceramic powders addition
Enter soft magnetism raw material, nano-amorphous powder is made through spraying and powder making, high resistivity is obtained finally by discharge plasma sintering legal system
The addition of Fe-Base nanocrystalline soft magnetic material, wherein ceramic powders had both solved that conventional soft magnetic materials resistivity is low, and high energy consumption lacks
Fall into, also uprise soft magnetic materials intensity, while nanocrystalline non crystalline structure is more excellent by the combination property of soft magnetic materials, makes it
With characteristics such as high saturated magnetic induction, high magnetic permeability, low-loss, low costs, the electronic component that can make greater efforts to promote is to high frequency
Change, lightweight direction is developed.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
（1）Take 2~3kg to crush potsherd, be put into jaw crusher and crushed, filter out particle diameter between 1~3cm
Fragment, continue to be put into agate mortar and pulverize, cross 200~300 mesh standard sieves, obtain potsherd powder；
（2）It is 70 in mass ratio:2:3:9 weigh during gross mass is put into for 500~800g iron powders, copper powder, niobium powder and boron powder
In frequency induction melting furnace, nitrogen is passed through inwards, it is 10~20mL/min to be passed through speed, until after displacing all air, with 5~
6KHz frequency carries out 5~8h of melting and obtains the molten slurry of alloy；
（3）The molten slurry of above-mentioned alloy is moved into gas atomization pulverization device, is 1~3mm from nozzle diameter, whiff pressure
For 30~50MPa, melt temperature carries out atomization spray for 1100~1300 DEG C and makes powder, by the alloy powder made using rotary
Powder sieving machine is sieved, and obtains alloy nanometer crystals powder of the particle diameter at 20~30 μm；
（4）It is in mass ratio by alloy nanometer crystals powder obtained above and potsherd powder and nanometer ferrite powder
5:2:1 is mixed, and 20~30min of grinding in agate mortar is put into after mixing, nanometer ferrite powder is coated on alloy and receives
Rice crystalline flour end and potsherd powder surface；
（5）The powder coated is fitted into stainless steel mould, powder carried out with 0.3~0.5MPa pressure with steel plate
Precompressed, the bed material powder in mould is set to be compacted, so as to follow-up sintering, the mould after precompressed is put into discharge plasma sintering stove,
Sintering furnace is vacuumized, furnace pressure is reached 500~700Pa；
（6）Under vacuum conditions, it is 5000~7000A to start sintering furnace to maintain pulse current, with 10~20 DEG C/min's
Rate program is warming up to 600~700 DEG C, is gone with powder, 4~6h of heat preservation sintering, decompression in 30~50MPa pressure compacting tool set
Mould, a diameter of 20mm is obtained, thickness is 10mm soft magnetic bodies, and external diameter 15mm is cut into wire electric discharge cutting equipment, internal diameter 10mm's
Magnet ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
The concrete application method of the present invention：High resistivity Fe-Base nanocrystalline soft magnetic material produced by the present invention is used in energy
The fields such as source, electrical equipment, electronics, after testing soft magnetic materials magnetic conductivity produced by the present invention reach 80~90, coercivity is 1000~
1100A/m, magnetic induction intensity are 0.7~0.8T, and resistance reaches 30~40m Ω, and compared with conventional soft magnetic materials, resistance improves
40~50%.
The beneficial effects of the invention are as follows：High resistivity Fe-Base nanocrystalline soft magnetic material preparation technology letter produced by the present invention
Single, raw material is easy to get, and cost is cheap, and it is low both to have solved conventional soft magnetic materials resistivity, the defects of high energy consumption, also makes soft magnetic materials strong
Degree uprises, while nanocrystalline non crystalline structure is more excellent by the combination property of soft magnetic materials.
Embodiment
Take 2~3kg to crush potsherd, be put into jaw crusher and crushed, filter out particle diameter between 1~3cm
Fragment, continue to be put into agate mortar and pulverize, cross 200~300 mesh standard sieves, obtain potsherd powder；It is in mass ratio
70:2:3:9 weigh gross mass is put into medium frequency induction melting furnace for 500~800g iron powders, copper powder, niobium powder and boron powder, leads to inwards
Enter nitrogen, it is 10~20mL/min to be passed through speed, until after displacing all air, with 5~6KHz frequency carry out melting 5~
8h obtains the molten slurry of alloy；The molten slurry of above-mentioned alloy is moved into gas atomization pulverization device, is 1~3mm from nozzle diameter, jet
Pressure is 30~50MPa, and melt temperature carries out atomization spray for 1100~1300 DEG C and makes powder, by the alloy powder made using rotation
Rotatable powder sieving machine is sieved, and obtains alloy nanometer crystals powder of the particle diameter at 20~30 μm；Alloy obtained above is received
Rice crystalline flour end and potsherd powder and nanometer ferrite powder are 5 in mass ratio:2:1 is mixed, and agate is put into after mixing
20~30min is ground in mortar, nanometer ferrite powder is coated on alloy nanometer crystals powder and potsherd powder surface；Will bag
The powder covered is fitted into stainless steel mould, carries out precompressed to powder with 0.3~0.5MPa pressure with steel plate, makes in mould
Bed material powder is compacted so as to follow-up sintering, and the mould after precompressed is put into discharge plasma sintering stove, sintering furnace is taken out
Vacuum, furnace pressure is set to reach 500~700Pa；Under vacuum conditions, start sintering furnace maintain pulse current be 5000~
7000A, 600~700 DEG C are warming up to 10~20 DEG C/min rate program, with powder in 30~50MPa pressure compacting tool set
Mould is removed in end, 4~6h of heat preservation sintering, decompression, obtains a diameter of 20mm, thickness is 10mm soft magnetic bodies, with wire electric discharge cutting equipment
It is cut into external diameter 15mm, internal diameter 10mm magnet ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
Example 1
Take 2kg to crush potsherd, be put into jaw crusher and crushed, filter out fragment of the particle diameter between 1cm, after
Continuous be put into agate mortar is pulverized, and is crossed 200 mesh standard sieves, is obtained potsherd powder；It is 70 in mass ratio:2:3:9 weigh
Gross mass is that 500g iron powders, copper powder, niobium powder and boron powder are put into medium frequency induction melting furnace, is passed through nitrogen inwards, being passed through speed is
10mL/min, until after displacing all air, melting 5h is carried out with 5KHz frequency and obtains the molten slurry of alloy；Above-mentioned alloy is melted
Slurry is moved into gas atomization pulverization device, be 1mm from nozzle diameter, and whiff pressure 30MPa, melt temperature enters for 1100 DEG C
Powder is made in row atomization spray, and the alloy powder made is sieved using rotary powder sieving machine, obtains particle diameter at 20 μm
Alloy nanometer crystals powder；Alloy nanometer crystals powder obtained above and potsherd powder and nanometer ferrite powder are pressed into quality
Than for 5:2:1 is mixed, and is put into after mixing in agate mortar and is ground 20min, nanometer ferrite powder is coated on alloy and is received
Rice crystalline flour end and potsherd powder surface；The powder coated is fitted into stainless steel mould, with steel plate with 0.3MPa pressure
Precompressed is carried out to powder, bed material powder in mould is compacted so as to follow-up sintering, by the mould after precompressed be put into electric discharge etc. from
In sub- sintering furnace, sintering furnace is vacuumized, furnace pressure is reached 500Pa；Under vacuum conditions, start sintering furnace to maintain
Pulse current is 5000A, and 600 DEG C are warming up to 10 DEG C/min rate program, with powder in 30MPa pressure compacting tool set,
Mould is removed in heat preservation sintering 4h, decompression, obtains a diameter of 20mm, and thickness is 10mm soft magnetic bodies, is cut into wire electric discharge cutting equipment outer
Footpath 15mm, internal diameter 10mm magnet ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
The concrete application method of the present invention：High resistivity Fe-Base nanocrystalline soft magnetic material produced by the present invention is used in covering
The fields such as the energy, electrical equipment, electronics, after testing soft magnetic materials magnetic conductivity produced by the present invention reach 80, coercivity 1000A/m,
Magnetic induction intensity is 0.7T, and resistance reaches 30m Ω, and compared with conventional soft magnetic materials, resistance improves 40%.
Example 2
Take 2kg to crush potsherd, be put into jaw crusher and crushed, filter out fragment of the particle diameter between 2cm, after
Continuous be put into agate mortar is pulverized, and is crossed 250 mesh standard sieves, is obtained potsherd powder；It is 70 in mass ratio:2:3:9 weigh
Gross mass is that 650g iron powders, copper powder, niobium powder and boron powder are put into medium frequency induction melting furnace, is passed through nitrogen inwards, being passed through speed is
15mL/min, until after displacing all air, melting 7h is carried out with 5KHz frequency and obtains the molten slurry of alloy；Above-mentioned alloy is melted
Slurry is moved into gas atomization pulverization device, be 2mm from nozzle diameter, and whiff pressure 40MPa, melt temperature enters for 1200 DEG C
Powder is made in row atomization spray, and the alloy powder made is sieved using rotary powder sieving machine, obtains particle diameter at 25 μm
Alloy nanometer crystals powder；Alloy nanometer crystals powder obtained above and potsherd powder and nanometer ferrite powder are pressed into quality
Than for 5:2:1 is mixed, and is put into after mixing in agate mortar and is ground 25min, nanometer ferrite powder is coated on alloy and is received
Rice crystalline flour end and potsherd powder surface；The powder coated is fitted into stainless steel mould, with steel plate with 0.4MPa pressure
Precompressed is carried out to powder, bed material powder in mould is compacted so as to follow-up sintering, by the mould after precompressed be put into electric discharge etc. from
In sub- sintering furnace, sintering furnace is vacuumized, furnace pressure is reached 600Pa；Under vacuum conditions, start sintering furnace to maintain
Pulse current is 6000A, and 650 DEG C are warming up to 15 DEG C/min rate program, with powder in 40MPa pressure compacting tool set,
Mould is removed in heat preservation sintering 5h, decompression, obtains a diameter of 20mm, and thickness is 10mm soft magnetic bodies, is cut into wire electric discharge cutting equipment outer
Footpath 15mm, internal diameter 10mm magnet ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
The concrete application method of the present invention：High resistivity Fe-Base nanocrystalline soft magnetic material produced by the present invention is used in covering
The fields such as the energy, electrical equipment, electronics, after testing soft magnetic materials magnetic conductivity produced by the present invention reach 85, coercivity 1050A/m,
Magnetic induction intensity is 0.7T, and resistance reaches 35m Ω, and compared with conventional soft magnetic materials, resistance improves 45%.
Example 3
Take 3kg to crush potsherd, be put into jaw crusher and crushed, filter out fragment of the particle diameter between 3cm, after
Continuous be put into agate mortar is pulverized, and is crossed 300 mesh standard sieves, is obtained potsherd powder；It is 70 in mass ratio:2:3:9 weigh
Gross mass is that 800g iron powders, copper powder, niobium powder and boron powder are put into medium frequency induction melting furnace, is passed through nitrogen inwards, being passed through speed is
20mL/min, until after displacing all air, melting 8h is carried out with 6KHz frequency and obtains the molten slurry of alloy；Above-mentioned alloy is melted
Slurry is moved into gas atomization pulverization device, be 3mm from nozzle diameter, and whiff pressure 50MPa, melt temperature enters for 1300 DEG C
Powder is made in row atomization spray, and the alloy powder made is sieved using rotary powder sieving machine, obtains particle diameter at 30 μm
Alloy nanometer crystals powder；Alloy nanometer crystals powder obtained above and potsherd powder and nanometer ferrite powder are pressed into quality
Than for 5:2:1 is mixed, and is put into after mixing in agate mortar and is ground 30min, nanometer ferrite powder is coated on alloy and is received
Rice crystalline flour end and potsherd powder surface；The powder coated is fitted into stainless steel mould, with steel plate with 0.5MPa pressure
Precompressed is carried out to powder, bed material powder in mould is compacted so as to follow-up sintering, by the mould after precompressed be put into electric discharge etc. from
In sub- sintering furnace, sintering furnace is vacuumized, furnace pressure is reached 700Pa；Under vacuum conditions, start sintering furnace to maintain
Pulse current is 7000A, and 700 DEG C are warming up to 20 DEG C/min rate program, with powder in 50MPa pressure compacting tool set,
Mould is removed in heat preservation sintering 6h, decompression, obtains a diameter of 20mm, and thickness is 10mm soft magnetic bodies, is cut into wire electric discharge cutting equipment outer
Footpath 15mm, internal diameter 10mm magnet ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
The concrete application method of the present invention：High resistivity Fe-Base nanocrystalline soft magnetic material produced by the present invention is used in covering
The fields such as the energy, electrical equipment, electronics, after testing soft magnetic materials magnetic conductivity produced by the present invention reach 90, coercivity 1100A/m,
Magnetic induction intensity is 0.8T, and resistance reaches 40m Ω, and compared with conventional soft magnetic materials, resistance improves 50%.
Claims (1)
1. a kind of preparation method of high resistivity Fe-Base nanocrystalline soft magnetic material, it is characterised in that specifically preparation process is：
（1）Take 2~3kg to crush potsherd, be put into jaw crusher and crushed, it is broken between 1~3cm to filter out particle diameter
Piece, continue to be put into agate mortar and pulverize, cross 200~300 mesh standard sieves, obtain potsherd powder；
（2）It is 70 in mass ratio:2:3:9 weigh gross mass is put into intermediate frequency sense for 500~800g iron powders, copper powder, niobium powder and boron powder
To answer in smelting furnace, be passed through nitrogen inwards, Ventilation Rate is 10~20mL/min, until after displacing all air, with 5~6KHz
Frequency carry out 5~8h of melting and obtain the molten slurry of alloy；
（3）The molten slurry of above-mentioned alloy is moved into gas atomization pulverization device, is 1~3mm from nozzle diameter, whiff pressure 30
~50MPa, melt temperature carry out atomization spray for 1100~1300 DEG C and make powder, and the alloy powder made is used into rotary powder
Screening machine is sieved, and obtains alloy nanometer crystals powder of the particle diameter between 20~30 μm；
（4）It is 5 in mass ratio by alloy nanometer crystals powder obtained above and potsherd powder and nanometer ferrite powder:2:
1 is mixed, and 20~30min of grinding in agate mortar is put into after mixing, nanometer ferrite powder is coated on alloy nanometer crystals
Powder and potsherd powder surface；
（5）The powder coated is fitted into stainless steel mould, powder carried out in advance with 0.3~0.5MPa pressure with steel plate
Pressure, the bed material powder in mould is set to be compacted, so as to follow-up sintering, the mould after precompressed is put into discharge plasma sintering stove, it is right
Sintering furnace is vacuumized, and furnace pressure is reached 500~700Pa；
（6）Under vacuum conditions, it is 5000~7000A to start sintering furnace to maintain pulse current, with 10~20 DEG C/min speed
Temperature programming is to 600~700 DEG C, and with powder in 30~50MPa pressure compacting tool set, 4~6h of heat preservation sintering, mould is removed in decompression,
A diameter of 20mm is obtained, thickness is 10mm soft magnetic bodies, and external diameter 15mm, internal diameter 10mm magnetic are cut into wire electric discharge cutting equipment
Ring, as a kind of high resistivity Fe-Base nanocrystalline soft magnetic material.
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| CN110428967B (en) * | 2019-08-27 | 2020-11-03 | 四川大学 | Preparation method of ultralow-temperature cold-sintered iron-based nanocrystalline composite magnetic powder core and product |
| CN114360884B (en) * | 2021-12-31 | 2023-08-01 | 华南理工大学 | Gradient nanocrystalline magnetic powder core with high magnetic induction and low loss as well as preparation method and application thereof |
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