CN106601460A - Cerium- and cobalt-doped sintered NdFeB magnet and preparation method thereof - Google Patents
Cerium- and cobalt-doped sintered NdFeB magnet and preparation method thereof Download PDFInfo
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- CN106601460A CN106601460A CN201611129093.3A CN201611129093A CN106601460A CN 106601460 A CN106601460 A CN 106601460A CN 201611129093 A CN201611129093 A CN 201611129093A CN 106601460 A CN106601460 A CN 106601460A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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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
- H01F1/032—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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working
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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
- H01F1/032—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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- Hard Magnetic Materials (AREA)
Abstract
The invention provides a cerium- and cobalt-doped sintered NdFeB magnet. The cerium- and cobalt-doped sintered NdFeB magnet comprises the constituents according to percent by mass: 28-32% of PrNd, 0.5-1.5% of B, 0-3% of Ce, 0.05-0.55% of Al, 0.05-0.25% of Cu, 0-2% of Co and 0-0.2% of Ga with the balance being Fe. The invention also provides a preparation method of the sintered NdFeB magnet. The cerium- and cobalt-doped sintered NdFeB magnet has the advantages of higher intrinsic coercivity, high demagnetization resistant capability, high application temperature and good corrosion resistance, and meanwhile, the production cost is reduced.
Description
Technical field
The invention belongs to rareearth magnetic material technical field, it is more particularly related to a kind of novel low-cost
Sintered NdFeB magnet of cerium cobalt doped and preparation method thereof.
Background technology
At present, rare earth permanent-magnetic material neodymium iron boron of new generation gets most of the attention as new and high technology new material, and it is the current world
Upper comprehensive magnetic can the most most wide permanent magnet material of strong, application.Sintered NdFeB has very high magnetocrystalline anisotropy field and height
Saturated pole intensity, its magnetic energy product lifted to 57.8MGOe by initial 35MGOe, now more rises to 59.6MGOe.Its whole world
, by nineteen eighty-three less than one ton, up till now annual whole world yield is up to 80000 tons for yield.The application of Nd-Fe-B permanent magnetic is given birth to through the mankind
The various aspects produced and live, the such as energy, traffic, machinery, medical treatment, IT, household electrical appliances industry, manufacture various magnetoes, vibration
Motor, permanent magnetism instrument, device for magnetotherapy, sound appliances etc..But the development and neodymium-iron-boron magnetic material with science and technology
The expansion of range of application, such as space shuttle, satellite, manned spaceship some special dimensions are except requiring that material has higher magnetic energy product
Outward, strict requirements are also proposed to the heat-resisting quantity of magnet (such as 450 DEG C of work).This requires magnet in high temperature, corrosion-resistant
Remain to keep superior performance under slightly environment Deng disliking.
The Curie temperature relatively low (314 DEG C) of neodymium iron boron magnetic body, the temperature coefficient of coercivity and the intensity of magnetization is relatively low, causes magnetic
Body heat stability is poor, and heat demagnetization easily occurs under high temperature, directly limit the range of application of magnet.A large amount of additions are needed in production
The heavy metal elements such as Dy, Tb improve material coercivity, so as to meet applied at elevated temperature performance.However, add excessive Dy, Tb will cause
Following two aspects problem：(1) because Dy and Fe forms antiferromagnetic coupling, the remanent magnetism of neodymium iron boron magnetic body is caused with the increase of Dy
Decline.If Dy too high levels in magnet, will be unable to while meeting the requirement of high energy product and high-coercive force.(2) heavy rare earth resource
It is rare, expensive, can virtually cause cost to improve and resource consumption increases.Therefore a kind of relative suitable material drop is found
It is very crucial to the dependence of dysprosium in low production.
The content of the invention
It is an object of the invention to solve at least the above or defect, and provide the advantage that at least will be described later.
In order to realize object of the present invention and further advantage, there is provided a kind of sintered NdFeB magnetic of cerium cobalt doped
Body, the Sintered NdFeB magnet includes by mass percentage：PrNd：28%～32%, B：0.5%～1.5%, Ce：0～
3%, Al：0.05%～0.55%, Cu：0.05%～0.25%, Co：0～2%, Ga：0%～0.2%, balance of Fe.
Preferably, wherein, the Sintered NdFeB magnet includes by mass percentage：PrNd：28.8%, B：
0.98%, Ce：2.2%, Al：0.50%, Cu：0.15%, Co：0.8%, Ga：0.10%, balance of Fe.
The purpose of the present invention further can also come real by the method for the Sintered NdFeB magnet for preparing the cerium cobalt doped
Existing, the method is comprised the following steps：
Step one, the raw material for preparing Sintered NdFeB magnet is put into and carry out in vacuum induction melting furnace melting, profit
Casting is carried out with SC slabs technique obtain Nd Fe B alloys thin slice；
Step 2, by the Nd Fe B alloys thin slice carry out in the quick-fried equipment of hydrogen inhale hydrogen Dehydroepiandrosterone derivative；
Step 3, step 2 is processed after Nd Fe B alloys thin slice carry out powder processed using airflow milling equipment, obtain neodymium ferrum
Boron powder；
Step 4, the neodymium iron boron powder for obtaining step 3 carry out magnetic field orientating and compression process, obtain neodymium iron boron pressed compact；
Step 5, the neodymium iron boron pressed compact for obtaining step 4 are sintered temper, obtain Sintered NdFeB magnet.
Preferably, wherein, the step one is specifically included：Vacuum induction melting furnace is evacuated to 10-2Pa；It is backward true
It is 35～45kPa that high-purity argon gas are filled with empty induction melting furnace to pressure, vacuum induction melting furnace is heated, smelting temperature
It is completely melt and is cast for raw material in the range of 1200 DEG C～1450 DEG C, chill roll rotating speed is 2.0～5.0m/s, obtains thickness
Spend the Nd Fe B alloys thin slice for 0.15～0.45mm.
Preferably, wherein, the step 2 is specifically included：It is quick-fried that the Nd Fe B alloys thin slice that step one is obtained inserts hydrogen
In stove, hydrogen is passed through, until furnace pressure reaches 0.1MPa and carries out inhaling hydrogen process, inhaling evacuation after hydrogen saturation drops to pressure
Below 0.08kPa, hydrogen blasting furnace is heated to into 580 DEG C carries out Dehydroepiandrosterone derivative, wherein, hydrogen purity >=99.99%.
Preferably, wherein, the step 3 is specifically included：The coarse powder obtained after step 2 Dehydroepiandrosterone derivative is carried out
Break process obtains the flour of 8～15 μm of mean diameter, carries out powder processed using airflow milling equipment afterwards, controls powder size and is
2.8～4.5 μm, average powder particle size is 3.3 μm, powder is stirred into mixed powder and processes 3.5h, obtains neodymium iron boron powder.
Preferably, wherein, the step 4 is specifically included：Under the protective atmosphere of nitrogen, neodymium iron boron powder is inserted
Mould adds magnetic field to carry out magnetic field orientating forming processes, magnetic field intensity >=1.5T by moulding press；Carry out then in conjunction with CIP techniques
Compacting green compact obtain neodymium iron boron pressed compact.
Preferably, wherein, the step 5 is specifically included：The neodymium iron boron pressed compact that step 4 is obtained enters in sintering furnace
Row sintering, insulation and cooling treatment, wherein, the atmosphere in sintering furnace is argon, and sintering temperature is 1020～1060 DEG C, during insulation
Between be 8～10h, chilling temperature be 20～80 DEG C；Then, the blank after cooling is tempered at 520-600 DEG C 3.0～3.5h it
After carry out argon it is air-cooled process obtain Sintered NdFeB magnet.
The present invention at least includes following beneficial effect：
1st, by the basis of Nd-Fe-B systems matrix material, with Ce part praseodymium neodymium being substituted, substitute part ferrum with Co and formed
New magnetic material, the magnet for comparing heavy rare earth doping reduces production cost；
2nd, by preparation method：Under vacuum, raw material melting is obtained into neodymium iron boron foundry alloy, then Jing melts are fast
Quenching equipment obtains alloy sheet, then Jing powder, compacting, sintering and second annealing are processed and obtain Sintered NdFeB magnet, there is higher
HCJ, high anti-demagnetization capability is high using temperature, and good corrosion resistance reduces production cost simultaneously；
3rd, why cerium is unsuccessfully because into that cerium reduces the Curie temperature of material for rare-earth magnet by early-stage Study,
But, when PrNd being substituted with Ce and when carrying out codope with Co, the magnetic property of material has and is obviously improved and more stable；
4th, avoid using the dysprosium of one of most rare and most expensive rare earth element, replace, using most abundant dilute
Earth elements cerium.Finally, by cerium and the Nd Fe B alloys magnet of cobalt codope, the magnet for being not added with Co is compared at high temperature certain
The speed of Hcj decay is reduced in degree, the ability to work of high temperature lower magnet is advantageously ensured that, this novel alloy magnet is high
The important consideration object of temperature application.
The further advantage of the present invention, target and feature embody part by description below, and part will also be by this
The research of invention and practice and be understood by the person skilled in the art.
Specific embodiment
Embodiment of the present invention is described with reference to embodiment, to make those skilled in the art with reference to description text
Word can be implemented according to this.
It should be appreciated that it is used herein such as " have ", "comprising" and " including " term do not allot one or many
The presence or addition of individual other elements or its combination.
Table 1：The constituent of the Sintered NdFeB magnet of cerium cobalt doped and mass percent in embodiment 1-3
Embodiment 1
Dispensing and melting：According to the composition and matter of the Sintered NdFeB magnet of cerium cobalt doped described in the embodiment 1 of table 1
Amount percentage ratio carries out dispensing, and contents 24wt% of the wherein Pr in Pr-Nd alloys, B is added in the form of B-Fe alloys, and B is in B-
Content in Fe alloys is 18wt%；Other raw materials are pure metal.The alloy raw material for preparing is put into into vacuum induction to melt
In furnace, in vacuum 10 are reached-2During Pa stop evacuation being filled with high-purity argon gas (purity ＞ 99.99%) reach it is right after 40kPa
Smelting furnace is heated.When smelting temperature reaches 1350 DEG C, dispensing is completely melt and is cast, chill roll rotating speed 2.5m/
S, obtains the Nd Fe B alloys thin slice that average thickness is 0.30mm；
Hydrogen is quick-fried with powder processed：Above-mentioned Nd Fe B alloys thin slice is inserted in hydrogen blasting furnace, hydrogen (purity >=99.99%) is passed through straight
Reaching 0.1MPa to furnace pressure carries out suction hydrogen, and inhaling evacuation after hydrogen saturation makes pressure drop to below 0.08kPa, by hydrogen blasting furnace plus
Heat is to 580 DEG C of dehydrogenations.Coarse powder after dehydrogenation carries out the flour that break process obtains mean diameter 8-15 μm, then using airflow milling
Equipment powder, controls powder size for 2.8～4.5 μm, and average powder particle size is 3.3 μm, powder is carried out into mixed powder and processes 3.5h,
Obtain neodymium iron boron powder；
Compacting：Above-mentioned neodymium iron boron powder is put in moulding press mould, with the magnetic field of 1.5T under nitrogen protection atmosphere
Carry out oriented moulding, demagnetization and Vacuum Package.Packaged pressed compact is put into into isostatic pressing machine and is forced into 220MPa, pressurize two minutes
Obtain neodymium iron boron pressed compact.
Sintering and tempering：Above-mentioned pressed compact is put in graphite material boat and is sintered in sintering furnace, furnace atmosphere is argon,
Sintering temperature is 1035 DEG C, and temperature retention time is 8h.Then argon is air-cooled after the blank of cooling being tempered into 3.0h at 520 DEG C, obtains
To Sintered NdFeB magnet.
Embodiment 2
Dispensing and melting：According to the composition and matter of the Sintered NdFeB magnet of cerium cobalt doped described in the embodiment 2 of table 1
Amount percentage ratio carries out dispensing, and contents 24wt% of the wherein Pr in Pr-Nd alloys, B is added in the form of B-Fe alloys, and B is in B-
Content in Fe alloys is 18wt%；Other raw materials are pure metal.The alloy raw material for preparing is put into into vacuum induction to melt
In furnace, in vacuum 10 are reached-2During Pa stop evacuation being filled with high-purity argon gas (purity ＞ 99.99%) reach it is right after 42kPa
Smelting furnace is heated.It is completely melt and is cast that chill roll rotating speed 2.7m/s obtains average in 1380 DEG C of material of smelting temperature
Thickness is the Nd Fe B alloys thin slice of 0.28mm.
Hydrogen is quick-fried with powder processed：Above-mentioned Nd Fe B alloys thin slice is inserted in hydrogen blasting furnace, hydrogen (purity >=99.99%) is passed through straight
Reaching 0.1MPa to furnace pressure carries out suction hydrogen, and inhaling evacuation after hydrogen saturation makes pressure drop to below 0.08kPa, by hydrogen blasting furnace plus
Heat is to 580 DEG C of dehydrogenations.Coarse powder after dehydrogenation carries out the flour that break process obtains mean diameter 8-15 μm.Then airflow milling is utilized
Equipment powder, controls powder size for 2.8～4.5 μm, and average powder particle size is 3.3 μm, powder is carried out into mixed powder and processes 3.5h,
Obtain neodymium iron boron powder.
Compacting：Above-mentioned neodymium iron boron powder is put in moulding press mould, with the magnetic field of 1.5T under nitrogen protection atmosphere
Carry out oriented moulding, demagnetization and Vacuum Package.Packaged pressed compact is put into into isostatic pressing machine and is forced into 220MPa, pressurize two minutes
Obtain neodymium iron boron pressed compact.
Sintering and tempering：Above-mentioned pressed compact is put in graphite material boat and is sintered in sintering furnace, furnace atmosphere is argon,
Sintering temperature is 1040 DEG C, and temperature retention time is 8.5h.Then argon is air-cooled after the blank of cooling being tempered into 4h at 540 DEG C, obtains
To Sintered NdFeB magnet.
Embodiment 3
Dispensing and melting：According to the composition and matter of the Sintered NdFeB magnet of cerium cobalt doped described in the embodiment 3 of table 1
Amount percentage ratio carries out dispensing, and contents 24wt% of the wherein Pr in Pr-Nd alloys, B is added in the form of B-Fe alloys, and B is in B-
Content in Fe alloys is 18wt%；Other raw materials are pure metal.The alloy raw material for preparing is put into into vacuum induction to melt
In furnace, when vacuum reaches 10-2Pa stop evacuation being filled with high-purity argon gas (purity ＞ 99.99%) reach it is right after 45kPa
Smelting furnace is heated.It is completely melt and is cast that chill roll rotating speed 3.0m/s obtains average in 1400 DEG C of material of smelting temperature
Thickness is the Nd Fe B alloys thin slice of 0.27mm.
Hydrogen is quick-fried with powder processed：Above-mentioned Nd Fe B alloys thin slice is inserted in hydrogen blasting furnace, hydrogen (purity >=99.99%) is passed through straight
Reaching 0.1MPa to furnace pressure carries out suction hydrogen, and inhaling evacuation after hydrogen saturation makes pressure drop to below 0.08kPa, by hydrogen blasting furnace plus
Heat is to 580 DEG C of dehydrogenations.Coarse powder after dehydrogenation carries out the flour that break process obtains mean diameter 8-15 μm.Then airflow milling is utilized
Equipment powder, controls powder size for 2.8～4.5 μm, and average powder particle size is 3.3 μm, powder is carried out into mixed powder and processes 3.5h,
Obtain neodymium iron boron powder.
Compacting：Above-mentioned neodymium iron boron mixed-powder is put in moulding press mould, with 1.5T's under nitrogen protection atmosphere
Magnetic field carries out oriented moulding, demagnetization and Vacuum Package.Packaged pressed compact is put into into isostatic pressing machine and is forced into 220MPa, pressurize two
Minute obtains neodymium iron boron pressed compact.
Sintering and tempering：Above-mentioned pressed compact is put in graphite material boat and is sintered in sintering furnace, furnace atmosphere is argon,
It is 9h that sintering temperature is 1045 DEG C of temperature retention times.Then argon is air-cooled after the blank of cooling being tempered into 3.5h at 560 DEG C, obtains
Sintered NdFeB magnet.
Obtained neodymium iron boron magnetic body in embodiment 1-3 is processed into into the sample of D10*10, using rare earth permanent magnet nondestructive measurement
Device to test room temperature, high temperature magnetic energy.Referring to table 2, table 2 is the burning that embodiment 1～3 is prepared with comparative example 1～3 to test result
The performance data table of knot neodymium iron boron magnetic body.
Table 2：The performance data table of the Sintered NdFeB magnet that embodiment 1～3 is prepared with comparative example 1～3.
Comparative example 1～3 is addition Ce but is not added with the NdFeB series magnets of Co, other preparation conditions and the phase of embodiment 1～3
Together.
As can be seen from the above data Sintered NdFeB magnet of the invention has preferable magnetic property.Neodymium ferrum containing Ce
Boron series magnet, with the rising of test temperature, Br and Hcj declines comparatively fast.And by Ce and Co codopes in embodiment 1～3
The magnet of Co is not added with neodymium iron boron magnetic body and comparative example 1～3, coercivity is significantly improved, remanent magnetism and magnetic energy product decline seldom.And
The speed of Hcj decay is reduced to a certain extent, advantageously ensures that the ability to work of high temperature lower magnet.In addition, rare earth metal
The reserves of elemental cerium are big, and price is low, and comparing current a large amount of addition heavy rare earth element Dy and Tb can using the method for temperature to increase
Effectively to reduce magnet generation cost.
Number of devices described herein and treatment scale are the explanations for simplifying the present invention.The cerium cobalt of the present invention is mixed
The application of miscellaneous Sintered NdFeB magnet, modifications and variations will be readily apparent to persons skilled in the art.
As described above, according to the present invention, it is to avoid using the dysprosium of one of most rare and most expensive rare earth element, take and generation
It, uses most abundant rare-earth element cerium.Finally, by cerium and the Nd Fe B alloys magnet of cobalt codope, compare at high temperature not
The magnet of addition Co reduces to a certain extent the speed of Hcj decay, advantageously ensures that the ability to work of high temperature lower magnet.This
Plant the important consideration object that novel alloy magnet is high temperature application.
Although embodiment of the present invention is disclosed as above, it is not restricted to listed in description and embodiment
With.It can be applied to completely various suitable the field of the invention.For those skilled in the art, can be easily
Realize other modification.Therefore under the general concept limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the embodiment with description.
Claims (8)
1. a kind of Sintered NdFeB magnet of cerium cobalt doped, the Sintered NdFeB magnet includes by mass percentage：PrNd：
28%～32%, B：0.5%～1.5%, Ce：0～3%, Al：0.05%～0.55%, Cu：0.05%～0.25%, Co：0
～2%, Ga：0%～0.2%, balance of Fe.
2. the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 1, wherein, the Sintered NdFeB magnet presses quality
Percentage ratio includes：PrNd：28.8%, B：0.98%, Ce：2.2%, Al：0.50%, Cu：0.15%, Co：0.8%, Ga：
0.10%, balance of Fe.
3. a kind of method for preparing the Sintered NdFeB magnet of cerium cobalt doped any one of claim 1～2, including it is following
Step：
Step one, the raw material for preparing Sintered NdFeB magnet is put into and carry out in vacuum induction melting furnace melting, using SC
Slab technique carries out casting and obtains Nd Fe B alloys thin slice；
Step 2, by the Nd Fe B alloys thin slice carry out in the quick-fried equipment of hydrogen inhale hydrogen Dehydroepiandrosterone derivative；
Step 3, step 2 is processed after Nd Fe B alloys thin slice carry out powder processed using airflow milling equipment, obtain Nd-Fe-B powder
End；
Step 4, the neodymium iron boron powder for obtaining step 3 carry out magnetic field orientating and compression process, obtain neodymium iron boron pressed compact；
Step 5, the neodymium iron boron pressed compact for obtaining step 4 are sintered temper, obtain Sintered NdFeB magnet.
4. the method for preparing the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 3, wherein, the step one is concrete
Including：Vacuum induction melting furnace is evacuated to 10-2Pa；Backward vacuum induction melting furnace in be filled with high-purity argon gas to pressure be 35
～45kPa, heats to vacuum induction melting furnace, and smelting temperature is that raw material is completely melt in the range of 1200 DEG C～1450 DEG C
And cast, chill roll rotating speed is 2.0～5.0m/s, obtains the Nd Fe B alloys thin slice that thickness is 0.15～0.45mm.
5. the method for preparing the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 3, wherein, the step 2 is concrete
Including：The Nd Fe B alloys thin slice that step one is obtained is inserted in hydrogen blasting furnace, is passed through hydrogen, until furnace pressure reaches 0.1MPa
Carry out inhaling hydrogen process, inhaling evacuation after hydrogen saturation makes pressure drop to below 0.08kPa, hydrogen blasting furnace is heated to into 580 DEG C and is taken off
Hydrogen process, wherein, hydrogen purity >=99.99%.
6. the method for preparing the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 3, wherein, the step 3 is concrete
Including：The coarse powder obtained after step 2 Dehydroepiandrosterone derivative is carried out into the flour that break process obtains 8～15 μm of mean diameter, it
Afterwards powder processed is carried out using airflow milling equipment, control powder size for 2.8～4.5 μm, average powder particle size is 3.3 μm, by powder
It is stirred mixed powder and processes 3.5h, obtains neodymium iron boron powder.
7. the method for preparing the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 3, wherein, the step 4 is concrete
Including：Under the protective atmosphere of nitrogen, by neodymium iron boron powder insert mould by moulding press plus magnetic field carry out magnetic field orientating into
Type process, magnetic field intensity >=1.5T；Compacting green compact are carried out then in conjunction with CIP techniques obtain neodymium iron boron pressed compact.
8. the method for preparing the Sintered NdFeB magnet of cerium cobalt doped as claimed in claim 3, wherein, wherein, the step
Five specifically include：The neodymium iron boron pressed compact that step 4 is obtained is sintered in sintering furnace, is incubated and cooling treatment, wherein, burn
Atmosphere in freezing of a furnace is argon, and sintering temperature is 1020～1060 DEG C, and temperature retention time is 8～10h, and chilling temperature is 20～80
℃；Then, the blank after cooling is carried out into the air-cooled process of argon after 3.0～3.5h of tempering at 520-600 DEG C to be sintered
Neodymium iron boron magnetic body.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257724A (en) * | 2019-07-16 | 2019-09-20 | 宁德市星宇科技有限公司 | A kind of preparation method of the neodymium iron boron magnetic body containing lanthanum and cerium |
| CN110544569A (en) * | 2019-08-24 | 2019-12-06 | 宁波合力磁材技术有限公司 | neodymium-iron-boron magnet and production process thereof |
| CN113593802A (en) * | 2021-07-08 | 2021-11-02 | 烟台正海磁性材料股份有限公司 | Corrosion-resistant high-performance neodymium iron boron sintered magnet and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257724A (en) * | 2019-07-16 | 2019-09-20 | 宁德市星宇科技有限公司 | A kind of preparation method of the neodymium iron boron magnetic body containing lanthanum and cerium |
| CN110257724B (en) * | 2019-07-16 | 2020-05-22 | 宁德市星宇科技有限公司 | Preparation method of neodymium-iron-boron magnet containing lanthanum and cerium |
| CN110544569A (en) * | 2019-08-24 | 2019-12-06 | 宁波合力磁材技术有限公司 | neodymium-iron-boron magnet and production process thereof |
| CN113593802A (en) * | 2021-07-08 | 2021-11-02 | 烟台正海磁性材料股份有限公司 | Corrosion-resistant high-performance neodymium iron boron sintered magnet and preparation method and application thereof |
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Application publication date: 20170426 |