CN106653267A - Orientation molding method of neodymium-iron-boron magnet - Google Patents
Orientation molding method of neodymium-iron-boron magnet Download PDFInfo
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- CN106653267A CN106653267A CN201611143000.2A CN201611143000A CN106653267A CN 106653267 A CN106653267 A CN 106653267A CN 201611143000 A CN201611143000 A CN 201611143000A CN 106653267 A CN106653267 A CN 106653267A
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- neodymium iron
- iron boron
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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
-
- 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
- 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
- B22F3/02—Compacting only
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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
- 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
- B22F3/10—Sintering only
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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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- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses an orientation molding method of a neodymium-iron-boron magnet. The orientation molding method comprises the following steps of loading prepared neodymium-iron-boron fine powder to a mold, putting the mold into a first magnetic field of which the magnetic induction intensity is 15,000-30,000Gs, keeping for 3-5s and carrying out magnetizing orientation on the neodymium-iron-boron fine powder in the mold; after the neodymium-iron-boron fine powder in the mold is subjected to magnetizing orientation, putting the mold into a second magnetic field of which the magnetic induction intensity is 5,000-10,000Gs and carrying out demagnetizing treatment on the neodymium-iron-boron fine powder subjected to magnetizing orientation to obtain a green compact of which the intensity is 3-4g/cm<3>, wherein the magnetic field directions of the first magnetic field and the second magnetic field are opposite; and carrying out vacuum sintering on the obtained green compact to obtain the neodymium-iron-boron magnet, wherein the sintering temperature is 1,000-1100 DEG C. According to the method, the neodymium-iron-boron magnet of which the magnet density, the residual magnetism, the coercivity and the magnetic energy product all are relatively high can be obtained under the condition of omitting the technological processes of press pressing, isostatic pressing, oily packaging film removal and the like, the production efficiency is improved and the production cost is reduced.
Description
Technical field
The invention belongs to magnet preparing technical field, the orientation die mould method of more particularly to a kind of neodymium iron boron magnetic body.
Background technology
Magnet is the material that can produce magnetic field, with the characteristic for attracting the ferromagnetic material such as metal such as iron, nickel, cobalt.Magnetic
Body is generally divided into permanent magnet and soft magnetic bodies, is mostly soft magnetic bodies as the material of magnetic conductor and electromagnet, and its polarity is with added
Polarity of the magnetic field and change；And permanent magnet is hard magnetic body, can for a long time keep the magnet of its magnetic, be difficult loss of excitation, be not easy to by
Magnetization.Thus, either in industrial production still in daily life, one of the most frequently used muscle material of hard magnetic body.
Hard magnetic body can be divided into natural magnet and artificial magnet, and artificial magnet is referred to can by synthesizing the alloy of different materials
To reach and natural magnet (magnet) identical effect, but also magnetic force can be improved.Occur as soon as early in 18th century artificial
Magnet, but manufacture the process of more strong magnetic material very slowly, produce alnico magnet until the thirties in 20th century
(AlNiCo), just it is possibly realized the large-scale application of magnet.Subsequently, the 1950's be manufactured that ferrite
(Ferrite), the sixties, the then appearance of rare earth permanent magnet, the application for magnet opens a New Times, first generation samarium cobalt permanent magnet
SmCo5, second generation precipitation hardenable samarium cobalt permanent magnet Sm2Co17, so far, develop into third generation Nd-Fe-B permanent magnet material
(NdFeB).Although at present ferrimagnet remains the maximum permanent-magnet material of consumption, the output value of neodymium iron boron magnetic body surpasses significantly
Ferrite permanent-magnet materials are crossed, a big industry is had evolved into.
Neodymium iron boron magnetic body is also referred to as neodymium magnet (Neodymium magnet), and its chemical formula is Nd2Fe14B, is a kind of artificial
Permanent magnet, be also the permanent magnet with most strong magnetic force so far, its maximum magnetic energy product (BH) max exceeds ferrite 10
More than times, in the state of naked magnetic, its magnetic force can reach 3500 Gauss.The advantage of neodymium iron boron magnetic body is that cost performance is high, body
The features such as little, lightweight, good mechanical property of product and strong magnetic, the advantage of such high-energy-density makes Nd-Fe-B permanent magnet material
Obtain a wide range of applications in modern industry and electronic technology, in magnetics circle magnetic king is described as.Thus, the system of neodymium iron boron magnetic body
The focus that standby and extension always gives more sustained attention in the industry.
At present, industry makes Nd-Fe-B permanent magnet material frequently with sintering process, and its fabrication processing is as shown in Figure 1.It is existing
It is general using the magnetic of constant weight is fitted in magnetically permeable mould in the orientation die mould stage in technology, mould is put into into pressure
Between electromechanical cartridge, while electromagnet provides magnetic field and magnetic is orientated, the pressure head of mould is pressed its compacting side by press
Formula is suppressed (can be divided into vertical pressure or parallel pressure by different press), is molded with this, and afterwards electromagnet provides reverse magnetic
, then demagnetization process is carried out to pressed compact.Thus obtained pressed compact through isostatic pressed, be stained with after oily packaging film etc. is processed to enter by removal
Row sintering.According to the mobility principle of powder, the pressed compact after compacting can not be orientated by 100%, the remanent magnetism of the magnet after sintering,
HCJ, magnetic energy product are often below theoretical value.
The content of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of orientation die mould method of neodymium iron boron magnetic body, the party
Method can be stained with the technical process such as oily packaging film press compacting, isostatic pressed, removal is saved, and obtain magnet density, remanent magnetism, coercive
The higher neodymium iron boron magnetic body of power and magnetic energy product, and production efficiency is the method increased, reduce production cost.
The present invention provide technical scheme be：
A kind of orientation die mould method of neodymium iron boron magnetic body, methods described includes：
Step one, by prepare neodymium iron boron fine powder is fitted in a mould, make the mould be placed in magnetic induction intensity be 15000
In first magnetic field of～30000Gs, kept for 3～5 seconds, to carry out the orientation that magnetizes to the neodymium iron boron fine powder in the mould；
Neodymium iron boron fine powder in step 2, the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity
In for second magnetic field of 5000～10000Gs, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes, obtaining density is
The pressed compact of 3～4g/cm3, wherein, the magnetic direction in first magnetic field and second magnetic field is contrary；
Step 3, the pressed compact to obtaining in step 2 carry out vacuum-sintering, obtain neodymium iron boron magnetic body, the temperature of the sintering
For 1000～1100 DEG C.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, the pressed compact to obtaining in step 2 is carried out
Vacuum-sintering, obtains also including after neodymium iron boron magnetic body step：Neodymium iron boron magnetic body to obtaining carries out vacuum tempering, the tempering
Temperature is 500～700 DEG C.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, magnetizes to the neodymium iron boron fine powder in the mould
Orientation and the process that implements demagnetized are：
Neodymium iron boron fine powder is uniformly loaded into the mould and is secured the mold on a conveyer belt, the conveyer belt will
The mould is sent at the electromagnet for producing first magnetic field；
Neodymium iron boron fine powder in the mould is magnetized after orientation, makes the electromagnet produce the second magnetic field, with to magnetizing
Neodymium iron boron fine powder after orientation carries out demagnetization process；
Dismounting mould, takes out pressed compact.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, by automatic blanking machine or manually addition
Mode is fitted into neodymium iron boron fine powder in the mould.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, it is described prepare neodymium iron boron fine powder method be：
The raw material of neodymium iron boron fine powder is prepared through melt-spun, the neodymium iron boron that thickness is 0.1-0.5 millimeters is obtained and is got rid of strap；
The neodymium iron boron for obtaining is got rid of into strap through hydrogenation break process, the neodymium iron that particle size is not more than 0.2 millimeter is obtained
Boron coarse granule magnetic；
After the neodymium iron boron coarse granule magnetic for obtaining is mixed with antioxidant, the mixed meal of neodymium iron boron is obtained；
The mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, neodymium iron boron fine powder, the particle chi of the neodymium iron boron fine powder is obtained
It is very little for 1-3 microns；
Neodymium iron boron fine powder to obtaining carries out mixed powder and processes, and obtains the neodymium iron boron fine powder of uniform component.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, the pressed compact to obtaining in step 2 is carried out
Vacuum-sintering, obtains neodymium iron boron magnetic body and is specially：Pressed compact is put in vacuum sintering furnace carries out vacuum-sintering.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, the described pair of neodymium iron boron fine powder for obtaining is mixed
Powder process, the neodymium iron boron fine powder for obtaining uniform component is specially：First advance deoxygenation is carried out to mixed powder equipment, then in oxygen free condition
Under, add organic additive to carry out mixed powder, the organic additive includes the one kind in zinc stearate, certain herbaceous plants with big flowers acid formicester and n-hexane
Or it is various.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, it is described by the neodymium iron boron coarse granule magnetic for obtaining
After mixing with antioxidant, in obtaining the step of neodymium iron boron mixes meal, incorporation time is 1～3h.
Preferably, the orientation die mould method of described neodymium iron boron magnetic body, it is described to carry out the mixed meal of the neodymium iron boron for obtaining
Airflow milling, obtains neodymium iron boron fine powder and is specially：
Advance deoxygenation is carried out to airflow milling equipment, protective gas is injected by nozzle, the mixed meal of the neodymium iron boron to obtaining enters
Row airflow milling, obtains neodymium iron boron fine powder；The time of the advance deoxygenation is not less than 40 minutes, makes containing in the airflow milling equipment
Oxygen amount is not more than 0.8%；The protective gas is nitrogen or inert gas.
The present invention at least includes following beneficial effect：Compared with prior art, the method eliminate press compacting, etc. it is quiet
The processes such as oily packaging film are stained with pressure, removal, improve production efficiency, reduce production cost；Because the method eliminates press pressure
The processes such as oily packaging film are stained with system, isostatic pressed, removal, reduce the blank chipping arrisdefect situation caused in above production process, drop
Low bad ratio；Due to NdFeB magnetic powder orientation when without compacting, so this method can be obtained the pressure of 100% orientation
Base, the magnet of higher magnet density, remanent magnetism, coercivity and magnetic energy product is obtained Jing after vacuum-sintering, vacuum tempering.
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.
Description of the drawings
Fig. 1 is the process flow diagram that neodymium iron boron magnetic body is made in prior art；
Fig. 2 is the schematic flow sheet of the orientation die mould method of neodymium iron boron magnetic body of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The all raw materials of the embodiment of the present invention, originate to it and have no particular limits, and commercially buy or according to ability
Prepared by conventional method known to field technique personnel.
The all raw materials of the present invention, are not particularly limited, present invention preferably employs Sintered NdFeB magnet field to its purity
The conventional purity for using.
To make the advantage of technical solution of the present invention clearer, the present invention is made specifically with reference to the accompanying drawings and examples
It is bright.
As shown in Fig. 2 the orientation die mould method of neodymium iron boron magnetic body provided in an embodiment of the present invention, comprises the following steps：
S10, the raw material of neodymium iron boron magnetic body is prepared through melt-spun, obtain the neodymium iron boron that thickness is 0.1-0.5 millimeters and get rid of
Strap；
It should be noted that the neodymium iron boron magnetic body described in the embodiment of the present invention, i.e. Sintered NdFeB magnet.The present invention is implemented
Example is not particularly limited to the source of each composition in the neodymium iron boron magnetic body raw material, with the market or art technology
Prepared by method known to personnel；The embodiment of the present invention does not have to the purity of each composition in the neodymium iron boron magnetic body raw material yet
Especially limit, with the purity for preparing neodymium iron boron magnetic body well known to those skilled in the art, preferably analyze pure.This
Bright embodiment is to the content of neodymium iron boron magnetic body raw material it is not also specifically limited, being preferably：Nd：28%～33%；Dy：0～10%；
Al：0～1%；B：0.5%～2.0%；Cu：0～1%；Co：0～3%；Balance of Fe.
And the embodiment of the present invention is not particularly limited to the process of melt-spun, with neodymium iron well known to those skilled in the art
Boron magnet melt-spun process.
S20, the neodymium iron boron for obtaining is got rid of strap through hydrogenation break process, obtain particle size and be not more than 0.2 millimeter
Neodymium iron boron coarse granule magnetic；
The embodiment of the present invention is not particularly limited to the hydrogenation break process process, with well known to those skilled in the art
Crumbling method.Those skilled in the art can be selected according to practical condition, quality requirement and properties of product
And adjustment.The break process of the present invention is preferably intermediate crusher and is crushed.
S30, the neodymium iron boron coarse granule magnetic for obtaining is mixed with antioxidant after, the mixed meal of neodymium iron boron is obtained, during mixing
Between be 1～3h；
The embodiment of the present invention is not particularly limited to the antioxidant, with magnet powder well known to those skilled in the art
Mixed powder additive.Antioxidant described in the embodiment of the present invention preferably includes zinc stearate, certain herbaceous plants with big flowers acid formicester and n-hexane
In one or more.
S40, the mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, obtains neodymium iron boron fine powder, the neodymium iron boron fine powder
Particle size is 1-3 microns；
Wherein, it is described that the mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, obtain neodymium iron boron fine powder and be specially：
Advance deoxygenation is carried out to airflow milling equipment, protective gas is injected by nozzle, the mixed meal of the neodymium iron boron to obtaining enters
Row airflow milling, obtains neodymium iron boron fine powder；The time of the advance deoxygenation is not less than 40 minutes, makes containing in the airflow milling equipment
Oxygen amount is not more than 0.8%；The protective gas is nitrogen or inert gas.
S50, the neodymium iron boron fine powder to obtaining carry out mixed powder and process, and obtain the neodymium iron boron fine powder of uniform component.
Wherein, the described pair of neodymium iron boron fine powder for obtaining carries out mixed powder process, and the neodymium iron boron fine powder for obtaining uniform component is concrete
For：First carry out advance deoxygenation to mixed powder equipment, then under anaerobic, add organic additive to carry out mixed powder, it is described organic to add
Plus agent includes one or more in zinc stearate, certain herbaceous plants with big flowers acid formicester and n-hexane.
S60, by prepare neodymium iron boron fine powder is fitted in a mould, make the mould be placed in magnetic induction intensity be 15000～
In first magnetic field of 30000Gs, magnetic induction intensity is preferably 2000Gs, is kept for 3～5 seconds, with to the neodymium iron in the mould
Boron fine powder carries out the orientation that magnetizes；
Wherein it is possible to neodymium iron boron fine powder is fitted in the mould by way of automatic blanking machine or manually addition,
The specific mode embodiment of the present invention is not limited.
Specifically process is：Neodymium iron boron fine powder is uniformly loaded into the mould and a conveyer belt is secured the mold in
On, the conveyer belt is sent on the mould at the electromagnet for producing first magnetic field, makes the mould be located at first
In magnetic field.
The fixed form embodiment of the present invention of the mould and conveyer belt does not do specific restriction, as long as be easy for fixation tearing open
The mode unloaded.
Neodymium iron boron fine powder in S70, the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity is
In second magnetic field of 5000～10000Gs, magnetic induction intensity is preferably：8000Gs, with to the neodymium iron boron fine powder after the orientation that magnetizes
Demagnetization process is carried out, the pressed compact that density is 3～4g/cm3 is obtained, wherein, the magnetic field in first magnetic field and second magnetic field
It is in opposite direction；
Specifically process is：Neodymium iron boron fine powder in the mould is magnetized after orientation, makes the electromagnet produce second
Magnetic field, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes；Mould is pulled down from conveyer belt, and takes out pressed compact.
It should be noted that the relative position embodiment of the present invention of conveyer belt and electromagnet is not specifically limited, as long as passing
Send with mould through fixed electromagnet, can be made to be located at the first magnetic field that electromagnet produces or reverse the in motion process
In two magnetic fields.
S80, the pressed compact to obtaining in step S70 carry out vacuum-sintering, obtain neodymium iron boron magnetic body, and the temperature of the sintering is
1000～1100 DEG C, sintering time is 1～3h, obtains high density, the neodymium iron boron magnetic body of high remanent magnetism.
Wherein, the pressed compact to obtaining in step 2 carries out vacuum-sintering, obtains neodymium iron boron magnetic body and is specially：By pressed compact
Being put in vacuum sintering furnace carries out vacuum-sintering.
S90, the neodymium iron boron magnetic body to obtaining carry out vacuum tempering, and the temperature is 500～700 DEG C, obtain high surplus
Magnetic, high density, high-coercive force, the neodymium iron boron magnetic body of high energy product.
In order to further illustrate the embodiment of the present invention, below in conjunction with the neodymium-iron-boron that specific embodiment is provided the present invention
The orientation die mould method of body is described in detail, and protection scope of the present invention is not limited to following embodiments.
Embodiment 1
1st, the raw material for preparing neodymium iron boron magnetic body is weighed according to mass percent composition：Nd：28.5wt%, Dy：4wt%, Al：
0.3wt%, B：1.0wt%, Cu：0.3wt%, Co：The Fe of 1.0wt% and surplus, through melt-spun, obtaining thickness is
The neodymium iron boron of 0.18-0.36 millimeters gets rid of strap；
2nd, the neodymium iron boron for obtaining is got rid of into strap through hydrogenation break process, obtains the neodymium iron boron that particle size is 0.14 millimeter
Coarse granule magnetic；
3rd, after the neodymium iron boron coarse granule magnetic for obtaining is mixed with zinc stearate, the mixed meal of neodymium iron boron, incorporation time are obtained
For 2h；
4th, the mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, obtains the neodymium iron boron fine powder that particle size is 1.45 microns；
5th, the neodymium iron boron fine powder to obtaining carries out mixed powder process, obtains the neodymium iron boron fine powder of uniform component；
6th, the neodymium iron boron fine powder for preparing is fitted in mould, make that the mould is placed in that magnetic induction intensity is 18000Gs the
In one magnetic field, kept for 3 seconds, to carry out the orientation that magnetizes to the neodymium iron boron fine powder in the mould；
7th, the neodymium iron boron fine powder in the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity is
In second magnetic field of 6000Gs, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes, density is obtained for 3～4g/cm3
Pressed compact, wherein, the magnetic direction in first magnetic field and second magnetic field is contrary；
8th, the pressed compact to obtaining carries out vacuum-sintering, obtains neodymium iron boron magnetic body, and the temperature of the sintering is 1020 DEG C, sintering
Time is 3h, obtains high density, the neodymium iron boron magnetic body of high remanent magnetism；
9th, the neodymium iron boron magnetic body to obtaining carries out vacuum tempering, and the temperature is 600 DEG C, obtains high remanent magnetism, highly dense
Degree, high-coercive force, the neodymium iron boron magnetic body of high energy product.
If by neodymium iron boron fine powder according to prior art, i.e.,：Neodymium iron boron fine powder is loaded into mould, is provided in electromagnet
18000Gs is orientated under magnetic field to magnetic, while press presses to the pressure head of mould, keeps 3s, electromagnet to provide pressed compact
The opposing magnetic field of 6000Gs, demagnetizes to pressed compact.Thus obtain contrasting pressed compact A.Contrast pressed compact A is carried out into vacuum-sintering, is burnt
Junction temperature is 1020 DEG C, sintering time 3h.The experiment pressed compact that embodiment 1 is obtained we become B.
Contrast pressed compact A and experiment pressed compact B are carried out into magnetism testing, the correction data in table 1 is obtained：
Table 1 contrasts the neodymium iron boron magnetic body performance of pressed compact A and experiment pressed compact B and density data contrast
As shown in Table 1, neodymium iron boron magnetic body remanent magnetism (Br) improves 6.7%, and coercivity (Hcb) improves 8.3%, HCJ
(Hcj) 4.6% is improved, maximum magnetic energy product ((BH) max) improves 15.8%, the intrinsic coercive in demagnetizing curve corresponding to 0.9Br
Power (HK) improves 5.3%, and squareness (HK/Hcj) improves 0.61% and magnet density raising 1.6%.Can clearly find out, this
Inventive embodiments can effectively improve the properties such as remanent magnetism, coercivity, magnetic energy product, the density of magnet.
Embodiment 2
1st, the raw material for preparing neodymium iron boron magnetic body is weighed according to mass percent composition：Nd：28wt%, Dy：1wt%, Al：
1wt%, B：0.5wt%, Cu：0.2wt%, Co：The Fe of 1.0wt% and surplus, through melt-spun, obtaining thickness is
The neodymium iron boron of 0.10-0.20 millimeters gets rid of strap；
2nd, the neodymium iron boron for obtaining is got rid of into strap through hydrogenation break process, obtains the neodymium iron boron that particle size is 0.2 millimeter
Coarse granule magnetic；
3rd, after the neodymium iron boron coarse granule magnetic for obtaining is mixed with zinc stearate, the mixed meal of neodymium iron boron, incorporation time are obtained
For 2h；
4th, the mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, obtains neodymium iron boron fine powder, the particle of the neodymium iron boron fine powder
Size is 1.45 microns；
5th, the neodymium iron boron fine powder to obtaining carries out mixed powder process, obtains the neodymium iron boron fine powder of uniform component；
6th, the neodymium iron boron fine powder for preparing is fitted in a mould, makes the mould be placed in magnetic induction intensity for 15000Gs's
In first magnetic field, kept for 3 seconds, to carry out the orientation that magnetizes to the neodymium iron boron fine powder in the mould；
7th, the neodymium iron boron fine powder in the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity is
In second magnetic field of 5000Gs, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes, density is obtained for 3～4g/cm3
Pressed compact, wherein, the magnetic direction in first magnetic field and second magnetic field is contrary；
8th, the pressed compact to obtaining carries out vacuum-sintering, obtains neodymium iron boron magnetic body, and the temperature of the sintering is 1000 DEG C, sintering
Time is 3h, obtains high density, the neodymium iron boron magnetic body of high remanent magnetism；
9th, the neodymium iron boron magnetic body to obtaining carries out vacuum tempering, and the temperature is 500 DEG C, obtains high remanent magnetism, highly dense
Degree, high-coercive force, the neodymium iron boron magnetic body of high energy product.
Embodiment 3
1st, the raw material for preparing neodymium iron boron magnetic body is weighed according to mass percent composition：Nd：33wt%, Dy：8wt%, Al：
0.8wt%, B：1.0wt%, Cu：0.3wt%, Co：The Fe of 1.0wt% and surplus, through melt-spun, obtaining thickness is
The neodymium iron boron of 0.18-0.36 millimeters gets rid of strap；
2nd, the neodymium iron boron for obtaining is got rid of into strap through hydrogenation break process, obtains the neodymium iron boron that particle size is 0.14 millimeter
Coarse granule magnetic；
3rd, after the neodymium iron boron coarse granule magnetic for obtaining is mixed with zinc stearate, the mixed meal of neodymium iron boron, incorporation time are obtained
For 2h；
4th, the mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, obtains neodymium iron boron fine powder, the particle of the neodymium iron boron fine powder
Size is 3 microns；
5th, the neodymium iron boron fine powder to obtaining carries out mixed powder process, obtains the neodymium iron boron fine powder of uniform component；
6th, the neodymium iron boron fine powder for preparing is fitted in a mould, makes the mould be placed in magnetic induction intensity for 30000Gs's
In first magnetic field, kept for 3 seconds, to carry out the orientation that magnetizes to the neodymium iron boron fine powder in the mould；
7th, the neodymium iron boron fine powder in the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity is
In second magnetic field of 10000Gs, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes, density is obtained for 3～4g/
The pressed compact of cm3, wherein, the magnetic direction in first magnetic field and second magnetic field is contrary；
8th, the pressed compact to obtaining carries out vacuum-sintering, obtains neodymium iron boron magnetic body, and the temperature of the sintering is 1100 DEG C, sintering
Time is 3h, obtains high density, the neodymium iron boron magnetic body of high remanent magnetism；
9th, the neodymium iron boron magnetic body to obtaining carries out vacuum tempering, and the temperature is 700 DEG C, obtains high remanent magnetism, highly dense
Degree, high-coercive force, the neodymium iron boron magnetic body of high energy product.
In sum, the present invention provide neodymium iron boron magnetic body orientation die mould method, can save press compacting, etc. it is quiet
Pressure, removal are stained with the technical process such as oily packaging film, obtain the higher neodymium iron of magnet density, remanent magnetism, coercivity and magnetic energy product
Boron magnet, and production efficiency is the method increased, reduce production cost.
Although embodiment of the present invention is disclosed as above, it is not restricted to listed in specification 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
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the legend with description.
Claims (9)
1. a kind of orientation die mould method of neodymium iron boron magnetic body, it is characterised in that methods described includes：
Step one, by prepare neodymium iron boron fine powder is fitted in a mould, make the mould be placed in magnetic induction intensity be 15000～
In first magnetic field of 30000Gs, kept for 3～5 seconds, to carry out the orientation that magnetizes to the neodymium iron boron fine powder in the mould；
Neodymium iron boron fine powder in step 2, the mould is magnetized after orientation, then the mould is placed in into magnetic induction intensity is
In second magnetic field of 5000～10000Gs, to carry out demagnetization process to the neodymium iron boron fine powder after the orientation that magnetizes, density is obtained for 3
The pressed compact of～4g/cm3, wherein, the magnetic direction in first magnetic field and second magnetic field is contrary；
Step 3, the pressed compact to obtaining in step 2 carry out vacuum-sintering, obtain neodymium iron boron magnetic body, and the temperature of the sintering is
1000～1100 DEG C.
2. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that described to obtaining in step 2
Pressed compact carry out vacuum-sintering, obtain also including after neodymium iron boron magnetic body step：Neodymium iron boron magnetic body to obtaining carries out vacuum and returns
Fire, the temperature is 500～700 DEG C.
3. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that to the neodymium iron in the mould
Boron fine powder magnetize orientation and demagnetize the process that implements be：
Neodymium iron boron fine powder is uniformly loaded into the mould and is secured the mold on a conveyer belt, the conveyer belt will be described
Mould is sent at the electromagnet for producing first magnetic field；
Neodymium iron boron fine powder in the mould is magnetized after orientation, makes the electromagnet produce the second magnetic field, with to the orientation that magnetizes
Neodymium iron boron fine powder afterwards carries out demagnetization process；
Dismounting mould, takes out pressed compact.
4. the orientation die mould method of the neodymium iron boron magnetic body as described in claim 1 or 3, it is characterised in that by automatic blanking machine
Or manually the mode of addition is fitted into neodymium iron boron fine powder in the mould.
5. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that described to prepare neodymium iron boron fine powder
Method be：
The raw material of neodymium iron boron fine powder is prepared through melt-spun, the neodymium iron boron that thickness is 0.1-0.5 millimeters is obtained and is got rid of strap；
The neodymium iron boron for obtaining is got rid of into strap through hydrogenation break process, obtaining particle size, to be not more than 0.2 millimeter of neodymium iron boron thick
Granulated magnetic powder；
After the neodymium iron boron coarse granule magnetic for obtaining is mixed with antioxidant, the mixed meal of neodymium iron boron is obtained；
The mixed meal of the neodymium iron boron for obtaining is carried out into airflow milling, neodymium iron boron fine powder is obtained, the particle size of the neodymium iron boron fine powder is
1-3 microns；
Neodymium iron boron fine powder to obtaining carries out mixed powder and processes, and obtains the neodymium iron boron fine powder of uniform component.
6. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that described to obtaining in step 2
Pressed compact carry out vacuum-sintering, obtain neodymium iron boron magnetic body and be specially：Pressed compact is put in vacuum sintering furnace carries out vacuum-sintering.
7. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 5, it is characterised in that the described pair of neodymium iron boron for obtaining
Fine powder carries out mixed powder and processes, and the neodymium iron boron fine powder for obtaining uniform component is specially：First carry out advance deoxygenation to mixed powder equipment, then
Under oxygen free condition, organic additive is added to carry out mixed powder, the organic additive includes zinc stearate, certain herbaceous plants with big flowers acid formicester and n-hexane
In one or more.
8. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 5, it is characterised in that described by the neodymium iron boron for obtaining
After coarse granule magnetic mixes with antioxidant, in obtaining the step of neodymium iron boron mixes meal, incorporation time is 1～3h.
9. the orientation die mould method of neodymium iron boron magnetic body as claimed in claim 5, it is characterised in that described by the neodymium iron boron for obtaining
Mixed meal carries out airflow milling, obtains neodymium iron boron fine powder and is specially：
Advance deoxygenation is carried out to airflow milling equipment, protective gas is injected by nozzle, the mixed meal of the neodymium iron boron to obtaining enters promoting the circulation of qi
Stream mill, obtains neodymium iron boron fine powder；The time of the advance deoxygenation is not less than 40 minutes, makes the oxygen content in the airflow milling equipment
No more than 0.8%；The protective gas is nitrogen or inert gas.
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| CN108231313A (en) * | 2017-12-28 | 2018-06-29 | 北京京磁电工科技有限公司 | The slab technique of sintered NdFeB ultra-high coercive force magnet |
| CN108417373A (en) * | 2018-02-05 | 2018-08-17 | 宁波松科磁材有限公司 | A method of regulation and control sintered NdFeB magnetic property |
| CN110165847A (en) * | 2019-06-11 | 2019-08-23 | 深圳市瑞达美磁业有限公司 | The production method of the solid magnet of radial anisotropic multipole of different in width waveform |
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| CN110165847A (en) * | 2019-06-11 | 2019-08-23 | 深圳市瑞达美磁业有限公司 | The production method of the solid magnet of radial anisotropic multipole of different in width waveform |
| US11183908B2 (en) | 2019-06-11 | 2021-11-23 | Shenzhen Radimag Magnets Co., Ltd | Method for producing radially anisotropic multipolar solid magnet adapted to different waveform widths |
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