CN108962527A - A kind of magnetic material and preparation method thereof - Google Patents
A kind of magnetic material and preparation method thereof Download PDFInfo
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- CN108962527A CN108962527A CN201810685799.0A CN201810685799A CN108962527A CN 108962527 A CN108962527 A CN 108962527A CN 201810685799 A CN201810685799 A CN 201810685799A CN 108962527 A CN108962527 A CN 108962527A
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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
- H01F1/032—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 hard-magnetic materials
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Abstract
The invention discloses a kind of magnetic materials and preparation method thereof, are composed of material first, material second, material third；Material first, material second, material third and material fourth weight ratio are 0.11-0.19:0.04-0.09:1.Material of the present invention is small in high temperature demagnetizing factor, and has good magnetic property.Preparation method simple process of the present invention, production cost is low, is suitable for industrialized production.
Description
Technical field
The invention belongs to field of inorganic materials, it is related to a kind of magnetic material and preparation method thereof.
Background technique
Magnetic material is usually used in electrical apparatus industry, and CN201610136736.0 discloses a kind of high magnetic rare earth of high temperature resistant type forever
Magnetic material and preparation method thereof contains R, Fe, B, M, wherein R is the ratio by light rare earth elements Pr, Nd according to 1:3 in material
The alloy of example composition, Fe is ferro element, and B is boron element, and M is molybdenum element.It is original with Pr-Nd alloy, Fe-B alloy and metal Mo
Material, under the protection of inert gas, carries out vacuum metling in vacuum melting furnace, obtains the uniform alloy pig of ingredient, then incite somebody to action
The above-mentioned alloy pig arrived carries out the processing of fast quenching strip casting, is crushed sieve after obtaining metal sheet band, and made annealing treatment.But
It is that the material comprehensive performance is not high.
Summary of the invention
The purpose of the present invention is to above-mentioned technological deficiencies, provide a kind of magnetic material, and the material is in high temperature demagnetizing factor
It is small, and there is good magnetic property.It is a further object of the present invention to provide a kind of magnetic material preparation method, the preparation method works
Skill is simple, and production cost is low, is suitable for industrialized production.
The technical solution adopted by the present invention are as follows: a kind of magnetic material is composed of material first, material second, material third；Material
Expect that first, material second, material third and material fourth weight ratio are 0.11-0.19:0.04-0.09:1；
Each ingredient and weight percentage in the material first are as follows: Al2O323-25%, Fe2O31.7-2.4%, La2O3
0.3-0.6%, K2O 3-8%, B2O34.8-5.5%, remaining SiO2；
The material second is copper alloy, ingredient Zn23-25%, La 0.11~0.19%, remaining Cu；
Each ingredient and weight percentage in the material third are as follows: B 4~6.5%, Nd 28~31%, Ag 0.03~
0.06%, La 0.8~1.3%, Sn 0.08~0.12%, P 0.08~0.13%, remaining Fe.
A kind of preparation method of above-mentioned magnetic material, comprising the following steps:
It 1) is Al according to weight percent when the preparation of material first2O323-25%, Fe2O31.7-2.4%, La2O3 0.3-
0.6%, K2O 3-8%, B2O34.8-5.5%, remaining SiO2Ingredient is carried out, each material purity is all larger than 99.9%；By each original
Material carries out mixing and breaking up in sand mill, then dries powder at 135-145 DEG C, re-sieving after drying, sieve is
200-220 mesh is then placed in sintering furnace and is sintered；Sintering temperature is 1290-1310 DEG C, finally by sintered product in grinder
In so that diameter of particle is reached 7-10 microns；
2) when prepared by material second, using copper alloy, ingredient Zn23-25%, La 0.11~0.19%, remaining Cu；It will
Raw material is put into melting in induction furnace, and smelting temperature is 1240~1280 DEG C, obtains alloy liquid；Alloy liquid injection is located at mist
Change in the tundish on nozzle；Aluminium alloy is met with high-speed flow by mist when passing through nozzle by tundish bottom leakage eye outflow
Fine drop is turned to, atomized drop is rapidly solidificated into alloy powder in closed atomizing cup；Alloy powder average particle size is 9
~12 μm；Atomization pressure is 9-12MPa；Liquid metal fluid flow is 2-5kg/min；Alloy liquid injects temperature
1240~1270 DEG C；Atomizing angle is 32 degree；
3) when the preparation of material third, according to weight percentage be B 4~6.5%, Nd 28~31%, Ag 0.03~
0.06%, La 0.8~1.3%, Sn 0.08~0.12%, P 0.08~0.13%, remaining Fe carry out ingredient；B is in ferro-boron
Between the form of alloy be added, the amount containing B of ferro-boron intermediate alloy is 24-26%；Other is pure material；It will first be melted in raw material induction furnace
Refining, smelting temperature are 1590~1620 DEG C, obtain master alloy liquid；Melting master alloy liquid pours under nitrogen protection to be turned in forming furnace
On disk, slab is formed；The linear velocity of turntable pour point is 22~26m/s；For slab with a thickness of 2~5 millimeters, long width is 5
~8 millimeters；It is then placed in a sealable reaction kettle, reaction kettle is passed through H2After S gas, 110~130 DEG C are heated, time 2-
3h then takes out air-cooled；Again will treated that slab is put into that vacuum degree is 0.17~0.19Pa, in furnace air pressure be 1.0~
The hydrogen crushing furnace progress hydrogen of 1.4atm is broken, and temperature is heated to 300~315 DEG C, obtains coarse powder within hydrogen broken 35~40 minutes；Then by coarse powder
It is put into airflow milling and grinds coarse powder for fine powder, it is 6~9 μm that average particle size, which is made, 6~8atm of airflow milling powder pressure；
5) after material first, material second, the third weight ratio of material are 0.11-0.19:0.04-0.09:1 ingredient, it is added to three-dimensional
It is uniformly mixed in mixing machine, obtains mixed powder；Then mixed powder is orientated in Magnetic field press, using etc. static pressure mode at
Type；Molded blank is put into sintering furnace to be sintered under protection of argon gas, is first warming up to 560-600 DEG C, 3-4h is kept the temperature, then rises
Temperature after being cooled to room temperature, carries out double tempering processing, i.e., respectively in 620-650 DEG C and 500- to 1100-1190 DEG C of sintering 3-4h
510 DEG C of tempering heat treatment 1-2h；Most product is obtained through 180-230 DEG C of ageing treatment afterwards.
The utility model has the advantages that
Products obtained therefrom of the present invention has excellent magnetic energy.In addition preparing alloy in kind ensure that material by proper treatment
The uniformity of ingredient, tissue and performance is expected, hereby it is ensured that the quality of material.Material first, that is, compound the bulk melting point of metal oxide
It is low, main phase crystal boundary can be evenly distributed in and play pinning effect, coercivity is improved.Material second fusing point is low, inhibits material
Phase is grown up in fourth, reduces main phase interface defect density, and magnetic reversal farmland is in interface forming core difficulty.Furthermore it can be distributed in disperse
Around main phase grain, it can be effectively improved the institutional framework of Grain-Boundary Phase, crystal boundary modified, reinforcing Grain-Boundary Phase is carried out to magnet.Cause
This improves the remanent magnetism of material.Secondary phase Fe-riched phase, inhibits the length of crystal grain intersection particle between the main phase grain that material third is formed
Greatly, main phase grain has been refined, therefore may refrain from the enhancing of their ambient stray fields, and then improve intrinsic coercivity.Material
Nd, Au, Ge, Lu, Zr and material fourth in third is corresponding, it is therefore prevented that diffusion transfer of the key element in sintering in material fourth.
Material fourth primarily forms magnetic main phase Nd2Fe14B and time main phase Lu2Fe14B enhances magnetic coupling interaction, makes the existing height of magnet
Coercivity in turn avoid remanent magnetism and decline to a great extent, to obtain higher comprehensive magnetic energy.During the sintering process, high-melting-point is added
Alloy element Zr can make that cenotype is precipitated in magnet tissue, eliminate the phenomenon that directly contacting between main phase grain, effectively inhibit master
Phase crystal grain is grown up, and is conducive to obtain relatively fine uniform grain structure, while can improve the thermal stability of main phase magnet.The material
Preparation process is easy, prepare it is raw materials used cost is relatively low, process is simple, and the alloy of production is with good performance, convenient for industrial
Metaplasia produces.Permanent-magnet material prepared by the present invention is suitable for electrical apparatus industry.
Specific embodiment
The present invention is described further below with reference to specific example:
Embodiment 1:
A kind of magnetic material is composed of material first, material second, material third；Material first, material second, material third and material
Material fourth weight ratio is 0.11:0.04:1；
Each ingredient and weight percentage in the material first are as follows: Al2O323%, Fe2O31.7%, La2O30.3%,
K2O 3%, B2O34.8%, remaining SiO2；
The material second is copper alloy, ingredient Zn23%, La 0.11%, remaining Cu；
Each ingredient and weight percentage in the material third are as follows: B 4%, Nd 28%, Ag 0.03%, La 0.8%,
Sn 0.08%, P 0.08%, remaining Fe.
Maximum magnetic energy product (BH) max for comparing Chinese patent CN201610136736.0 is 128-133kj/m3, coercivity
Hci is 750-988kA/m, and remanent magnetism Br is 890-908mT, and (160 DEG C, 8 hours) of demagnetizing factor % are 0.97-1.15.The present embodiment
Maximum magnetic energy product (BH) max be 135kj/m3, coercivity H i is 990kA/m, and remanent magnetism Br is 918mT, demagnetizing factor % (160
DEG C, 8 hours) be 0.60.The even tissue of the present embodiment magnetic material is fine and close.
A kind of preparation method of above-mentioned magnetic material, comprising the following steps:
It 1) is Al according to weight percent when the preparation of material first2O323%, Fe2O31.7%, La2O30.3%, K2O
3%, B2O34.8%, remaining SiO2Ingredient is carried out, each material purity is all larger than 99.9%；Each raw material is carried out in sand mill
Mixing and breaking up then dries powder, re-sieving after drying at 135 DEG C, sieve be 200 mesh, be then placed in sintering furnace into
Row sintering；Sintering temperature is 1290 DEG C, finally so that diameter of particle is reached 7 microns in grinder sintered product；
2) when prepared by material second, using copper alloy, ingredient Zn23%, La 0.11%, remaining Cu；Raw material is put into
Melting in induction furnace, smelting temperature are 1240 DEG C, obtain alloy liquid；Alloy liquid is injected in being located on atomizer
Between packet in；Aluminium alloy is met with high-speed flow when passing through nozzle and is atomized as fine drop, mist by tundish bottom leakage eye outflow
Change drop and is rapidly solidificated into alloy powder in closed atomizing cup；Alloy powder average particle size is 9 μm；Atomization pressure
For 9MPa；Liquid metal fluid flow is 2kg/min；It is 1240 DEG C that alloy liquid, which injects temperature,；Atomizing angle is 32 degree；
3) when the preparation of material third, according to weight percentage be B 4%, Nd 28%, Ag 0.03%, La 0.8%,
Sn 0.08%, P 0.08%, remaining Fe carry out ingredient；B is added in the form of ferro-boron intermediate alloy, and ferro-boron intermediate alloy contains B
Amount is 24%；Other is pure material；First by melting in raw material induction furnace, smelting temperature is 1590 DEG C, obtains master alloy liquid；It is molten
Melt master alloy liquid to pour under nitrogen protection on forming furnace turntable, forms slab；The linear velocity of turntable pour point is 22m/
s；For slab with a thickness of 2 millimeters, long width is 5 millimeters；It is then placed in a sealable reaction kettle, reaction kettle is passed through H2S gas
Afterwards, 110 DEG C are heated, time 2h then takes out air-cooled；It again will treated that slab is put into that vacuum degree is 0.17Pa, air pressure in furnace
Broken for the hydrogen crushing furnace progress hydrogen of 1.0atm, temperature is heated to 300 DEG C, obtains coarse powder within hydrogen broken 35 minutes；Then coarse powder is put into gas
Coarse powder is ground as fine powder in stream mill, it is 6 μm that average particle size, which is made, airflow milling powder pressure 6atm；
5) it after material first, material second, the third weight ratio of material are 0.11:0.04:1 ingredient, are added in three-dimensional mixer and mix
It closes uniformly, obtains mixed powder；Then mixed powder is orientated in Magnetic field press, using etc. static pressure mode form；Hair will be formed
Base is put into sintering furnace under protection of argon gas and is sintered, and is first warming up to 560 DEG C, keeps the temperature 3h, then heats to 1100 DEG C of sintering 3h,
After being cooled to room temperature, double tempering processing is carried out, i.e., respectively in 620 DEG C and 500 DEG C of tempering heat treatment 1h；Most afterwards through 180 DEG C when
Effect handles to obtain product.
Embodiment 2:
A kind of magnetic material is composed of material first, material second, material third；Material first, material second, material third and material
Material fourth weight ratio is 0.15:0.06:1；
Each ingredient and weight percentage in the material first are as follows: Al2O324%, Fe2O32.1%, La2O30.4%,
K2O 6%, B2O35.1%, remaining SiO2；
The material second is copper alloy, ingredient Zn24%, La 0.15%, remaining Cu；
Each ingredient and weight percentage in the material third are as follows: B 5%, Nd 29%, Ag 0.04%, La 1.1%,
Sn 0.1%, P 0.11%, remaining Fe.
Maximum magnetic energy product (BH) max for comparing Chinese patent CN201610136736.0 is 128-133kj/m3, coercivity
Hci is 750-988kA/m, and remanent magnetism Br is 890-908mT, and (160 DEG C, 8 hours) of demagnetizing factor % are 0.97-1.15.The present embodiment
Maximum magnetic energy product (BH) max be 138kj/m3, coercivity H i is 995kA/m, and remanent magnetism Br is 923mT, demagnetizing factor % (160
DEG C, 8 hours) be 0.52.The even tissue of the present embodiment magnetic material is fine and close.
A kind of preparation method of above-mentioned magnetic material, comprising the following steps:
It 1) is Al according to weight percent when the preparation of material first2O324%, Fe2O32.1%, La2O30.4%, K2O
6%, B2O35.1%, remaining SiO2Ingredient is carried out, each material purity is all larger than 99.9%；Each raw material is carried out in sand mill
Mixing and breaking up then dries powder, re-sieving after drying at 140 DEG C, sieve be 210 mesh, be then placed in sintering furnace into
Row sintering；Sintering temperature is 1300 DEG C, finally so that diameter of particle is reached 8 microns in grinder sintered product；
2) when prepared by material second, using copper alloy, ingredient Zn24%, La 0.15%, remaining Cu；Raw material is put into
Melting in induction furnace, smelting temperature are 1260 DEG C, obtain alloy liquid；Alloy liquid is injected in being located on atomizer
Between packet in；Aluminium alloy is met with high-speed flow when passing through nozzle and is atomized as fine drop, mist by tundish bottom leakage eye outflow
Change drop and is rapidly solidificated into alloy powder in closed atomizing cup；Alloy powder average particle size is 10 μm；Atomization gas pressure
Power is 10MPa；Liquid metal fluid flow is 3kg/min；It is 1260 DEG C that alloy liquid, which injects temperature,；Atomizing angle is 32 degree；
3) when the preparation of material third, according to weight percentage be B 5%, Nd 29%, Ag 0.04%, La 1.1%,
Sn 0.1%, P 0.11%, remaining Fe carry out ingredient；B is added in the form of ferro-boron intermediate alloy, and ferro-boron intermediate alloy contains B
Amount is 25%；Other is pure material；First by melting in raw material induction furnace, smelting temperature is 1600 DEG C, obtains master alloy liquid；It is molten
Melt master alloy liquid to pour under nitrogen protection on forming furnace turntable, forms slab；The linear velocity of turntable pour point is 24m/
s；For slab with a thickness of 3 millimeters, long width is 6 millimeters；It is then placed in a sealable reaction kettle, reaction kettle is passed through H2S gas
Afterwards, 120 DEG C are heated, time 2.5h then takes out air-cooled；It again will treated that slab is put into that vacuum degree is 0.18Pa, gas in furnace
The hydrogen crushing furnace progress hydrogen that pressure is 1.2atm is broken, and temperature is heated to 305 DEG C, obtains coarse powder within hydrogen broken 38 minutes；Then coarse powder is put into
Coarse powder is ground as fine powder in airflow milling, it is 7 μm that average particle size, which is made, airflow milling powder pressure 7atm；
5) it after material first, material second, the third weight ratio of material are 0.15:0.06:1 ingredient, are added in three-dimensional mixer and mix
It closes uniformly, obtains mixed powder；Then mixed powder is orientated in Magnetic field press, using etc. static pressure mode form；Hair will be formed
Base is put into sintering furnace under protection of argon gas and is sintered, and is first warming up to 580 DEG C, keeps the temperature 3.5h, then heats to 1140 DEG C of sintering
3.5h after being cooled to room temperature, carries out double tempering processing, i.e., respectively in 635 DEG C and 505 DEG C of tempering heat treatment 1.5h；Most pass through afterwards
200 DEG C of ageing treatments obtain product.
Embodiment 3
A kind of magnetic material is composed of material first, material second, material third；Material first, material second, material third and material
Material fourth weight ratio is 0.19:0.09:1；
Each ingredient and weight percentage in the material first are as follows: Al2O325%, Fe2O32.4%, La2O30.6%,
K2O 8%, B2O35.5%, remaining SiO2；
The material second is copper alloy, ingredient Zn25%, La 0.19%, remaining Cu；
Each ingredient and weight percentage in the material third are as follows: B 6.5%, Nd 31%, Ag 0.06%, La
1.3%, Sn 0.12%, P 0.13%, remaining Fe.
Maximum magnetic energy product (BH) max for comparing Chinese patent CN201610136736.0 is 128-133kj/m3, coercivity
Hci is 750-988kA/m, and remanent magnetism Br is 890-908mT, and (160 DEG C, 8 hours) of demagnetizing factor % are 0.97-1.15.The present embodiment
Maximum magnetic energy product (BH) max be 134kj/m3, coercivity H i is 992kA/m, and remanent magnetism Br is 921mT, demagnetizing factor % (160
DEG C, 8 hours) be 0.58.The even tissue of the present embodiment magnetic material is fine and close.
A kind of preparation method of above-mentioned magnetic material, comprising the following steps:
It 1) is Al according to weight percent when the preparation of material first2O325%, Fe2O32.4%, La2O30.6%, K2O
8%, B2O35.5%, remaining SiO2Ingredient is carried out, each material purity is all larger than 99.9%；Each raw material is carried out in sand mill
Mixing and breaking up then dries powder, re-sieving after drying at 145 DEG C, sieve be 220 mesh, be then placed in sintering furnace into
Row sintering；Sintering temperature is 1310 DEG C, finally so that diameter of particle is reached 10 microns in grinder sintered product；
2) when prepared by material second, using copper alloy, ingredient Zn25%, La 0.19%, remaining Cu；Raw material is put into
Melting in induction furnace, smelting temperature are 1280 DEG C, obtain alloy liquid；Alloy liquid is injected in being located on atomizer
Between packet in；Aluminium alloy is met with high-speed flow when passing through nozzle and is atomized as fine drop, mist by tundish bottom leakage eye outflow
Change drop and is rapidly solidificated into alloy powder in closed atomizing cup；Alloy powder average particle size is 12 μm；Atomization gas pressure
Power is 12MPa；Liquid metal fluid flow is 5kg/min；It is 1270 DEG C that alloy liquid, which injects temperature,；Atomizing angle is 32 degree；
3) when the preparation of material third, according to weight percentage be B 6.5%, Nd 31%, Ag 0.06%, La1.3%,
Sn 0.12%, P 0.13%, remaining Fe carry out ingredient；B is added in the form of ferro-boron intermediate alloy, and ferro-boron intermediate alloy contains B
Amount is 26%；Other is pure material；First by melting in raw material induction furnace, smelting temperature is 1620 DEG C, obtains master alloy liquid；It is molten
Melt master alloy liquid to pour under nitrogen protection on forming furnace turntable, forms slab；The linear velocity of turntable pour point is 26m/
s；For slab with a thickness of 5 millimeters, long width is 8 millimeters；It is then placed in a sealable reaction kettle, reaction kettle is passed through H2S gas
Afterwards, 130 DEG C are heated, time 3h then takes out air-cooled；It again will treated that slab is put into that vacuum degree is 0.19Pa, air pressure in furnace
Broken for the hydrogen crushing furnace progress hydrogen of 1.4atm, temperature is heated to 315 DEG C, obtains coarse powder within hydrogen broken 40 minutes；Then coarse powder is put into gas
Coarse powder is ground as fine powder in stream mill, it is 9 μm that average particle size, which is made, airflow milling powder pressure 8atm；
5) it after material first, material second, the third weight ratio of material are 0.19:0.09:1 ingredient, are added in three-dimensional mixer and mix
It closes uniformly, obtains mixed powder；Then mixed powder is orientated in Magnetic field press, using etc. static pressure mode form；Hair will be formed
Base is put into sintering furnace under protection of argon gas and is sintered, and is first warming up to 600 DEG C, keeps the temperature 4h, then heats to 1190 DEG C of sintering 4h,
After being cooled to room temperature, double tempering processing is carried out, i.e., respectively in 650 DEG C and 510 DEG C of tempering heat treatment 2h；Most afterwards through 230 DEG C when
Effect handles to obtain product.
It should be pointed out that for those skilled in the art, without departing from the principle of the present invention,
Several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.In the present embodiment not
The available prior art of specific each component part is realized.
Claims (2)
1. a kind of magnetic material, it is characterised in that: be composed of material first, material second, material third；Material first, material second, material
Material third and material fourth weight ratio are 0.11-0.19:0.04-0.09:1；
Each ingredient and weight percentage in the material first are as follows: Al2O323-25%, Fe2O31.7-2.4%, La2O3
0.3-0.6%, K2O 3-8%, B2O34.8-5.5%, remaining SiO2；
The material second is copper alloy, ingredient Zn23-25%, La 0.11~0.19%, remaining Cu；
Each ingredient and weight percentage in the material third are as follows: B 4~6.5%, Nd 28~31%, Ag 0.03~
0.06%, La 0.8~1.3%, Sn 0.08~0.12%, P 0.08~0.13%, remaining Fe.
2. a kind of preparation method of magnetic material according to claim 1, it is characterised in that: the following steps are included:
It 1) is Al according to weight percent when the preparation of material first2O323-25%, Fe2O31.7-2.4%, La2O3 0.3-
0.6%, K2O 3-8%, B2O34.8-5.5%, remaining SiO2Ingredient is carried out, each material purity is all larger than 99.9%；It will be each
Raw material carries out mixing and breaking up in sand mill, then dries powder at 135-145 DEG C, re-sieving after drying, and sieve is
200-220 mesh is then placed in sintering furnace and is sintered；Sintering temperature is 1290-1310 DEG C, is finally grinding sintered product
Diameter of particle is set to reach 7-10 microns in machine；
2) when prepared by material second, using copper alloy, ingredient Zn23-25%, La 0.11~0.19%, remaining Cu；By raw material
It is put into melting in induction furnace, smelting temperature is 1240~1280 DEG C, obtains alloy liquid；Alloy liquid injection is located at atomization spray
In tundish on mouth；Aluminium alloy by tundish bottom leakage eye outflow, when passing through nozzle with high-speed flow meet be atomized for
Fine drop, atomized drop are rapidly solidificated into alloy powder in closed atomizing cup；Alloy powder average particle size is 9~12
μm；Atomization pressure is 9-12MPa；Liquid metal fluid flow is 2-5kg/min；Alloy liquid inject temperature be 1240~
1270℃；Atomizing angle is 32 degree；
3) when the preparation of material third, according to weight percentage be B 4~6.5%, Nd 28~31%, Ag 0.03~
0.06%, La 0.8~1.3%, Sn 0.08~0.12%, P 0.08~0.13%, remaining Fe carry out ingredient；B is with ferro-boron
The form of intermediate alloy is added, and the amount containing B of ferro-boron intermediate alloy is 24-26%；Other is pure material；It first will be in raw material induction furnace
Melting, smelting temperature are 1590~1620 DEG C, obtain master alloy liquid；Melting master alloy liquid is poured under nitrogen protection in forming furnace
On turntable, slab is formed；The linear velocity of turntable pour point is 22~26m/s；With a thickness of 2~5 millimeters, long width is slab
5~8 millimeters；It is then placed in a sealable reaction kettle, reaction kettle is passed through H2After S gas, 110 ~ 130 DEG C are heated, time 2-
3h then takes out air-cooled；Again will treated that slab is put into that vacuum degree is 0.17~0.19Pa, in furnace air pressure be 1.0~
The hydrogen crushing furnace progress hydrogen of 1.4atm is broken, and temperature is heated to 300~315 DEG C, obtains coarse powder within hydrogen broken 35~40 minutes；Then by coarse powder
It is put into airflow milling and grinds coarse powder for fine powder, it is 6~9 μm that average particle size, which is made, 6~8atm of airflow milling powder pressure；
5) it after material first, material second, the third weight ratio of material are 0.11-0.19:0.04-0.09:1 ingredient, is added to three-dimensional mixed
It is uniformly mixed in conjunction machine, obtains mixed powder；Then mixed powder is orientated in Magnetic field press, using etc. static pressure mode form；
Molded blank is put into sintering furnace to be sintered under protection of argon gas, is first warming up to 560-600 DEG C, 3-4h is kept the temperature, then heats up
To 1100-1190 DEG C of sintering 3-4h, after being cooled to room temperature, double tempering processing is carried out, i.e., respectively in 620-650 DEG C and 500-
510 DEG C of tempering heat treatment 1-2h；Most product is obtained through 180-230 DEG C of ageing treatment afterwards.
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| CN110534281A (en) * | 2019-09-27 | 2019-12-03 | 江苏南方永磁科技有限公司 | A kind of permanent-magnet material and preparation method thereof |
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Application publication date: 20181207 |