CN108389710A - A kind of preparation method of high-performance neodymium-iron-boron magnet - Google Patents
A kind of preparation method of high-performance neodymium-iron-boron magnet Download PDFInfo
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- 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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- C25D3/00—Electroplating: Baths therefor
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- 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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- 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
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- H01—ELECTRIC ELEMENTS
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- 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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Abstract
The invention discloses a kind of preparation methods of high-performance neodymium-iron-boron magnet, include the following steps：1) nearly just dividing than 2:14:1 Nd Fe B alloys raw material carries out vacuum melting and obtains Nd Fe B alloys ingot casting；2) 1) gained ingot casting is subjected to powder processed, obtains Nd Fe B alloys powder；3) 2) gained Nd Fe B alloys powder is subjected to magnetic field orientating die mould, then carries out isostatic cool pressing, obtains green compact；4) 3) gained green compact is pre-sintered, obtains the sintering briquette that consistency is 80%~90%；5) compound of dysprosium or terbium and 1 methyl, 3 ethylimidazolium chloride quinoline (MEIC) are made into fused salt, as plating solution, using the sintering briquette obtained by step 4) as cathode, dysprosium or terbium metal are as anode, it is electroplated so that adhere to the metal atomic layer of one layer of dysprosium or terbium on sintering briquette；Sintering briquette after will be electroplated in step 5) re-sinters and tempering heat treatment, obtains and finally oozes Dy/Tb magnets.It is few that gained magnet oozes dysprosium/terbium dosage, oozes Dy, oozes that Tb is efficient, and the production time is short.
Description
Technical field
The present invention relates to rare-earth permanent-magnet material technical fields, more specifically, it relates to a kind of high-performance neodymium-iron-boron magnet
Preparation method.
Background technology
True benevolence in assistant river of nineteen eighty-three Japan et al. uses on the basis of to RE-Fe-X ternary alloy three-partalloys study extensively
Powder metallurgical technique prepares magnetic energy product and is up to 290kJ/m3Neodymium iron boron (Nd-Fe-B) sintered magnet, it is dilute to have started the third generation
Native permanent-magnet material.Sintered Nd-Fe-B is widely used in military industry equipment, electro-acoustic element, motor, generator, hard disc of computer and drives
Dynamic device (HDD), voice coil motor (VCM), human body NMR imaging instrument (MRI), short-wave communication tedhnology, controller, instrument, magnetic point
From equipment, magnetic card disk and other need to use permanent-magnetic field device and equipment in.
Sintered NdFeB magnet is with Nd2Fe14B compounds are main phase, are around coated with the structure of Nd-rich phase.It is main
Technical indicator include remanent magnetism Br, maximum magnetic energy product (BH) max, coercivity H j, Curie temperature Tc.By 20 years of researches
Development has devised rational alloying component and ripe preparation process, the remanent magnetism Br of magnet is made to have reached the 96% of theoretical value
More than, magnetic energy product can reach 474kJ/m3, approached theoretical magnetic energy product 512kJ/m393%.Although coercivity obtains
The promotion of certain depth, but for its theoretical value 5600kA/m, still there is prodigious gap, it can reach at present
Level is probably the 1/10~1/3 of its coercivity theoretical value.Neodymium iron boron magnetic body is thus greatly limited in high work temperature
It is applied under degree environment.
In order to solve this problem, scientific worker has been engaged in a large amount of research, studies have shown that being oozed in neodymium iron boron magnetic body
The coercivity of magnet can be improved by entering Dy or Tb, and existing technological means includes mainly that heavy rare earth alloy or Nd replace Dy/Tb oxygen
Compound/fluoride, but these technologies all there is a problem of it is more or less, as the former is due to the anti-magnetic of heavy rare earth atom and iron atom
Property coupling, the indexs such as the remanent magnetism of magnet and maximum magnetic energy product can substantially reduce, the Nd and Dy or Tb at the latter's main phase grain edge
Oxide or fluoride directly replace, replacing velocity is very slow, to make to ooze Dy, ooze Tb efficiency very low, the production time
It is long.And the dysprosium used in the above method/terbium dosage is big, it is of high cost.
Invention content
The object of the present invention is to provide a kind of dysprosium/terbium dosage is few, ooze Dy, ooze the Tb efficient production times it is short prepare high property
The preparation method of energy neodymium iron boron magnetic body.
To achieve the above object, it is realized by following technological means：
A kind of preparation method of high-performance neodymium-iron-boron magnet, includes the following steps：
1) nearly just dividing than 2:14:1 Nd Fe B alloys raw material carries out vacuum melting and obtains Nd Fe B alloys ingot casting；
2) 1) gained ingot casting is subjected to powder processed, obtains Nd Fe B alloys powder；
3) 2) gained Nd Fe B alloys powder is subjected to magnetic field orientating die mould, then carries out isostatic cool pressing, obtains green compact；
4) 3) gained green compact is pre-sintered, obtains the sintering briquette that consistency is 80%~90%；
5) compound of dysprosium or terbium and 1- methyl -3- ethylimidazolium chlorides quinolines (MEIC) are made into fused salt, as plating solution,
Using the sintering briquette obtained by step 4) as cathode, dysprosium or terbium metal are electroplated as anode so that on sintering briquette adhere to one layer of dysprosium or
The metal atomic layer of terbium；
6) sintering briquette after will be electroplated in step 5) re-sinters and tempering heat treatment, obtains and finally oozes Dy/Tb magnetic
Body.
Advanced optimize for：In step 1), the smelting technology is to use rapid hardening belt-rejecting technology that thickness is made as 0.2-
The Nd Fe B alloys thin slice of 0.5mm, or Nd Fe B alloys ingot casting is made using casting ingot process.
Advanced optimize for：In step 2), the flouring technology is that alloy cast ingot is first carried out coarse crushing, is added
The antioxidant of 0.02wt%-0.70wt%, it is 3~5 μm of Nd Fe B alloys powder that then air-flow, which is milled into average grain diameter,.
Advanced optimize for：Magnetic field intensity >=1.8T described in step 3), isostatic cool pressing pressure are 150-250MPa.
Advanced optimize for：It is the 900-1000 DEG C of sintering 3-5h in vacuum sintering furnace to be pre-sintered described in step 4).
Advanced optimize for：Prepare in step 5) fused salt the specific steps are：Weigh the chemical combination of quantitative anhydrous dysprosium or terbium
Object and MEIC, MEIC is put into beaker, is slowly added to the compound of anhydrous dysprosium or terbium, is stirred continuously, and keeps two kinds of solids gradual
It melts, is starched using the mixture of dry ice and methanol as bath in preparation process.
Advanced optimize for：The compound of the anhydrous dysprosium or terbium is dysprosium chloride, terbium chloride or dysprosium nitrate or terbium nitrate
In one kind.
Advanced optimize for：Re-sintered in step 6) is that 1020-1080 DEG C of sintering 3-5h, tempering are in vacuum sintering furnace
Primary tempering, or be first once tempered, carry out double tempering again, the primary tempering is carried out at 650-920 DEG C, is kept the temperature
2.5-5h, double tempering carry out at 450-650 DEG C, keep the temperature 2.5-5h.
Beneficial effects of the present invention are：The present invention is using one layer of dysprosium of plating first on not complete fully dense neodymium iron boron sintering briquette
Or the metal atomic layer of terbium, metal atomic layer activity is high, and there are many gaps, metallic atom to be easy on fine and close sintering briquette
It spreads, and enters inside gap thereto, during follow-up re-sinter with tempering heat treatment, the dysprosium or terbium that diffuse into advance
Metallic atom is just easy to spread to magnet grain boundary, into crystal boundary, is re-sintered and tempering heat treatment by rationally controlling
Temperature-time may make dysprosium or terbium to be enriched in grain boundaries, and is distributed in crystal grain inside gradient, so that oozing the surplus of Dy/Tb magnets
Magnet coercivity is improved while magnetic and magnetic energy product do not significantly reduce, to obtain high performance Sintered NdFeB magnet.
The advantages of the present invention over the prior art are that：1) atomic layer level thickness obtained by plating atomic layer is uniform, and metal is former
Son is fast to inner diffusing rate, that is, oozes that Dy, to ooze Tb efficient；2) metallic atom is active in the atomic layer being electroplated, and inwardly diffusion is rapid,
So that Dy/Tb raw materials needed for final are few, significant effect；3) gained magnet coercivity greatly improves, and remanent magnetism and magnetic energy product reduce not
Obviously.
Specific implementation mode
Invention is described in further detail below by specific embodiment, following embodiment is descriptive, is not to limit
Protection scope of the present invention of property.
Embodiment 1
Design is based on 2:14:The Nd Fe B alloys ingredient Nd11.76Fe82.36B5.88 (atomic percentage) of 1 phase, according to
The raw metal that purity is 99.9wt% is put into and gets rid of band in rapid hardening furnace the neodymium that thickness is 0.25mm is made by the ingredient composition of design
Ferroboron thin slice；Then rapid hardening thin slice is put into hydrogen broken furnace, leads to hydrogen stream 70ml/min, reacted 4 hours, hydrogen is broken to obtain 60
Mesh powder particle；Then the antioxidant of 0.05wt% is added, is transferred to the neodymium iron boron conjunction ground in airflow milling and be made 5 μm in 2 hours
Bronze end, by gained powder in the magnetic fields 1.8T oriented moulding and through 200MPa isostatic presseds, obtain green compact；Green compact is put into vacuum to burn
It is sintered 3 hours for 940 DEG C in freezing of a furnace, the sintering briquette that consistency is 82% is made；It starches, will burn using the mixture of dry ice and methanol as bath
Cup is put into bath paddle, weighs quantitative anhydrous terbium chloride and 1- methyl -3- ethylimidazolium chlorides quinolines (MEIC), MEIC is put into
In beaker, it is slowly added to anhydrous terbium chloride, is stirred continuously, so that two kinds of solids is gradually melted, be made into bath salt, using sintering briquette as the moon
Pole, as plating solution, terbium metal is electroplated the fused salt that terbium chloride and MEIC are made into as anode so that adheres to one on sintering briquette
Then the sintering briquette for being coated with metal atomic layer is put into vacuum sintering furnace 1020 DEG C and is sintered 3 hours, so by the metal atomic layer of layer terbium
Keep the temperature 2.5 hours at 650 DEG C afterwards, air quenching to room temperature, be then warming up to again 450 DEG C keep the temperature 2.5 hours, air quenching to room temperature to get
Required magnet A1.
Embodiment 2
Design is based on 2:14:The Nd Fe B alloys ingredient Nd8.82Pr2.94Fe80.00Co1.36Zr1.00B5.88 of 1 phase
The raw metal that purity is 99.9wt% is put into rapid hardening furnace according to the ingredient composition of design and gets rid of band system by (atomic percentage)
At the Nd Fe B alloys thin slice that thickness is 0.3mm；Then rapid hardening thin slice is put into hydrogen broken furnace, leads to hydrogen stream 72ml/min, instead
It answers 4 hours, hydrogen is broken to obtain 70 mesh powder particles；Then the antioxidant of 0.10wt% is added, is transferred in airflow milling and grinds 3 hours
4.5 μm of Nd Fe B alloys powder is made, by gained powder in the magnetic fields 1.8T oriented moulding and through 200MPa isostatic presseds, must press
Base；Green compact is put into vacuum sintering furnace and is sintered 3.2 hours for 960 DEG C, the sintering briquette that consistency is 85% is made；With dry ice and methanol
Mixture as bath starch, by beaker be put into bath paddle in, weigh quantitative anhydrous dysprosium chloride and 1- methyl -3- ethylimidazolium chlorides
Quinoline (MEIC), MEIC is put into beaker, is slowly added to anhydrous dysprosium chloride, is stirred continuously, and so that two kinds of solids is gradually melted, is matched
At bath salt, using sintering briquette as cathode, the fused salt that dysprosium chloride and MEIC are made into carries out electricity as plating solution, dysprosium metal as anode
Plating so that the then sintering briquette for being coated with metal atomic layer is put into vacuum sintering furnace by the metal atomic layer for adhering to one layer of dysprosium on sintering briquette
In 1050 DEG C be sintered 3 hours, then keep the temperature 3 hours at 650 DEG C, air quenching to room temperature, be then warming up to again 480 DEG C heat preservation 3 hours,
Air quenching is to room temperature to get required magnet A2.
Embodiment 3
Design is based on 2:14:The Nd Fe B alloys ingredient Nd8.82Pr2.94Fe81.3Al1.00B5.88 (atoms hundred of 1 phase
Score), according to the ingredient composition of design, the raw metal that purity is 99.9wt% is put into rapid hardening furnace to get rid of band thickness is made it is
The Nd Fe B alloys thin slice of 0.3mm；Then rapid hardening thin slice is put into hydrogen broken furnace, leads to hydrogen stream 74ml/min, reacted 4 hours,
Hydrogen is broken to obtain 80 mesh powder particles；Then the antioxidant of 0.20wt% is added, is transferred in airflow milling and grinds 4 hours obtained 4.0 μ
The Nd Fe B alloys powder of m, by gained powder in the magnetic fields 1.8T oriented moulding and through 200MPa isostatic presseds, obtain green compact；It will pressure
Base is put into vacuum sintering furnace and is sintered 3.5 hours for 980 DEG C, and the sintering briquette that consistency is 87% is made；With the mixing of dry ice and methanol
Object is starched as bath, and beaker is put into bath paddle, quantitative anhydrous nitric acid dysprosium and 1- methyl -3- ethylimidazolium chloride quinolines are weighed
(MEIC), MEIC is put into beaker, is slowly added to anhydrous nitric acid dysprosium, is stirred continuously, so that two kinds of solids is gradually melted, be made into bath
Salt, using sintering briquette as cathode, as plating solution, dysprosium metal is electroplated as anode, is made the fused salt that dysprosium nitrate and MEIC are made into
The metal atomic layer for adhering to one layer of dysprosium on sintering briquette is obtained, then the sintering briquette for being coated with dysprosium metal atomic layer is put into vacuum sintering furnace
1080 DEG C are sintered 3 hours, then keep the temperature 4 hours at 690 DEG C, air quenching to room temperature, are then warming up to 500 DEG C again and keep the temperature 4 hours, gas
It quenches to room temperature to get required magnet A3.
Embodiment 4
Design is based on 2:14:The Nd Fe B alloys ingredient Nd8.82Ce2.94Fe81.3Al1.00Zn0.06B5.88 of 1 phase
The raw metal that purity is 99.9wt% is put into rapid hardening furnace according to the ingredient composition of design and gets rid of band system by (atomic percentage)
At the Nd Fe B alloys thin slice that thickness is 0.3mm；Then rapid hardening thin slice is put into hydrogen broken furnace, leads to hydrogen stream 76ml/min, instead
It answers 5 hours, hydrogen is broken to obtain 80 mesh powder particles；Then the antioxidant of 0.20wt% is added, is transferred in airflow milling and grinds 5 hours
3.5 μm of Nd Fe B alloys powder is made, by gained powder in the magnetic fields 1.8T oriented moulding and through 200MPa isostatic presseds, must press
Base；Green compact is put into vacuum sintering furnace and is sintered 3.6 hours for 1000 DEG C, the sintering briquette that consistency is 88% is made；With dry ice and first
The mixture of alcohol is starched as bath, and beaker is put into bath paddle, quantitative anhydrous nitric acid terbium and 1- methyl -3- ethylmercury chloride miaows are weighed
Oxazoline (MEIC), MEIC is put into beaker, is slowly added to anhydrous nitric acid terbium, is stirred continuously, and two kinds of solids is made gradually to melt,
It is made into bath salt, using sintering briquette as cathode, the fused salt that terbium nitrate and MEIC are made into is carried out as plating solution, terbium metal as anode
Plating so that adhere to the metal atomic layer of one layer of dysprosium on sintering briquette, the sintering briquette for being coated with terbium metal atomic layer, which is then put into vacuum, burns
It is sintered 3 hours for 1030 DEG C in freezing of a furnace, then keeps the temperature 3 hours at 700 DEG C, then air quenching to room temperature is warming up to 550 DEG C of heat preservations 3 again
Hour, air quenching to room temperature is to get required magnet A4.
Embodiment 5
Design is based on 2:14:The Nd Fe B alloys ingredient Nd8.82Pr2.94Fe80.00Ga1.36In1.00B5.88 of 1 phase
The raw metal that purity is 99.9wt% is put into rapid hardening furnace according to the ingredient composition of design and gets rid of band system by (atomic percentage)
At the Nd Fe B alloys thin slice that thickness is 0.3mm；Then rapid hardening thin slice is put into hydrogen broken furnace, leads to hydrogen stream 80ml/min, instead
It answers 4 hours, hydrogen is broken to obtain 100 mesh powder particles；Then the antioxidant of 0.30wt% is added, it is small to be transferred to mill 8 in airflow milling
When 2.5 μm of Nd Fe B alloys powder is made, by gained powder in the magnetic fields 1.8T oriented moulding and through 200MPa isostatic presseds, obtain
Green compact；Green compact is put into vacuum sintering furnace and is sintered 3.2 hours for 920 DEG C, the sintering briquette that consistency is 87% is made；With dry ice and first
The mixture of alcohol is starched as bath, and beaker is put into bath paddle, quantitative anhydrous nitric acid terbium and 1- methyl -3- ethylmercury chloride miaows are weighed
Oxazoline (MEIC), MEIC is put into beaker, is slowly added to anhydrous nitric acid terbium, is stirred continuously, and two kinds of solids is made gradually to melt,
It is made into bath salt, using sintering briquette as cathode, the fused salt that terbium nitrate and MEIC are made into is carried out as plating solution, terbium metal as anode
Plating so that adhere to the metal atomic layer of one layer of dysprosium on sintering briquette, the sintering briquette for being coated with terbium metal atomic layer, which is then put into vacuum, burns
It is sintered 3 hours for 1050 DEG C in freezing of a furnace, then keeps the temperature 3 hours at 850 DEG C, then air quenching to room temperature is warming up to 600 DEG C of heat preservations 3 again
Hour, air quenching to room temperature is to get required magnet A5.
The magnet of gained in embodiment 1 to 5 is tested for the property, the results are shown in Table 1.
The performance of 1 magnet A1 to A5 of table
| Intrinsic coercivity kOe | Remanent magnetism kGs | Magnetic energy product MGOe | |
| A1 | 18.42 | 13.37 | 44.5 |
| A2 | 20.39 | 13.17 | 43.5 |
| A3 | 17.95 | 13.27 | 43.5 |
| A4 | 19.39 | 13.77 | 46.3 |
| A5 | 18.93 | 13.17 | 42.9 |
From table 1 it follows that the coercivity of gained magnet is improved, while remanent magnetism and magnetic energy product do not significantly reduce,
The magnet of high magnetic characteristics is obtained.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of preparation method of high-performance neodymium-iron-boron magnet, which is characterized in that include the following steps：
1) nearly just dividing than 2:14:1 Nd Fe B alloys raw material carries out vacuum melting and obtains Nd Fe B alloys ingot casting；
2) 1) gained ingot casting is subjected to powder processed, obtains Nd Fe B alloys powder；
3) 2) gained Nd Fe B alloys powder is subjected to magnetic field orientating die mould, then carries out isostatic cool pressing, obtains green compact；
4) 3) gained green compact is pre-sintered, obtains the sintering briquette that consistency is 80%~90%；
5) compound of dysprosium or terbium and 1- methyl -3- ethylimidazolium chlorides quinolines (MEIC) are made into fused salt, as plating solution, with step
It is rapid 4) obtained by sintering briquette as cathode, dysprosium or terbium metal as anode, be electroplated so that adhere to one layer of dysprosium or terbium on sintering briquette
Metal atomic layer；
6) sintering briquette after will be electroplated in step 5) re-sinters and tempering heat treatment, obtains and finally oozes Dy/Tb magnets.
2. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that in step 1),
The smelting technology is to use rapid hardening belt-rejecting technology that thickness is made as the Nd Fe B alloys thin slice of 0.2-0.5mm, or use ingot casting
Nd Fe B alloys ingot casting is made in technique.
3. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that in step 2),
The flouring technology is that alloy cast ingot is first carried out coarse crushing, the antioxidant of 0.02wt%-0.70wt% is added, then air-flow
It is milled into the Nd Fe B alloys powder that average grain diameter is 3~5 μm.
4. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that institute in step 3)
Magnetic field intensity >=1.8T is stated, isostatic cool pressing pressure is 150-250MPa.
5. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that institute in step 4)
It is the 900-1000 DEG C of sintering 3-5h in vacuum sintering furnace to state pre-sintering.
6. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that match in step 5)
Fused salt processed the specific steps are：The compound and MEIC for weighing quantitative anhydrous dysprosium or terbium, MEIC is put into beaker, is slowly added
The compound for entering anhydrous dysprosium or terbium, is stirred continuously, and so that two kinds of solids is gradually melted, with the mixing of dry ice and methanol in preparation process
Object is starched as bath.
7. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 6, which is characterized in that described is anhydrous
The compound of dysprosium or terbium is one kind in dysprosium chloride, terbium chloride or dysprosium nitrate or terbium nitrate.
8. a kind of preparation method of high-performance neodymium-iron-boron magnet according to claim 1, which is characterized in that in step 6) again
Sintering is the 1020-1080 DEG C of sintering 3-5h in vacuum sintering furnace, and tempering is once to be tempered, or be first once tempered, again
Carry out double tempering, it is described it is primary tempering carried out at 650-920 DEG C, keep the temperature 2.5-5h, double tempering at 450-650 DEG C into
Row keeps the temperature 2.5-5h.
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