CN108831648A - The method of spray drying preparation performance Nd Fe B sintered magnet - Google Patents
The method of spray drying preparation performance Nd Fe B sintered magnet Download PDFInfo
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- CN108831648A CN108831648A CN201810643365.4A CN201810643365A CN108831648A CN 108831648 A CN108831648 A CN 108831648A CN 201810643365 A CN201810643365 A CN 201810643365A CN 108831648 A CN108831648 A CN 108831648A
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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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Abstract
The invention discloses a kind of methods of spray drying preparation performance Nd Fe B sintered magnet, include the following steps：1) nearly just dividing than 2:14:Nd Fe B alloys rapid-hardening flake is made using strip casting in 1 Nd Fe B alloys raw material；2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；3) by Nd Fe B alloys powder and heavy rare earth metal powder or heavy rare earth compound powder according to mass ratio (100~150)：1 is dissolved in 25~35min of ultrasonic disperse in a certain amount of ether, obtains slurries；4) dry composite powder is made by spray drying in above-mentioned slurries；5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, Nd-Fe-B permanent magnet is made in vacuum-sintering and tempering heat treatment.Gained magnet coercivity of the invention greatly improves, and remanent magnetism and magnetic energy product reduction are unobvious, and simultaneous spray drying carries out in closed container, and raw material producing level is high, and required heavy rare earth raw material is few, significant effect.
Description
Technical field
The present invention relates to technical field of magnetic materials, prepare high performance sintered neodymium more specifically, it relates to be spray-dried
The method of iron boron magnet.
Background technique
True benevolence in assistant river of nineteen eighty-three Japan et al. uses on the basis of study extensively to RE-Fe-X ternary alloy three-partalloy
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 NdFeB magnet since the invention, is obtained with its excellent comprehensive performance and the price of relative moderate
It is widely applied.In recent years, with the accelerated development of science and technology, Sintered NdFeB magnet is in new-energy automobile, frequency-changeable compressor and wind
The promotion rate and application range of the high-end fields such as power power generation expand rapidly.These fields, which are required to Sintered NdFeB magnet, to be had
Higher comprehensive magnetic energy has high remanent magnetism and high coercivity.
Sintered NdFeB magnet is with Nd2Fe14B compound is main phase, is 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 reasonable alloying component and mature 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 have very big gap, can achieve 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 seeping in neodymium iron boron magnetic body
The coercivity of magnet can be improved by entering Dy or Tb, and existing technological means mainly includes heavy rare earth alloy or Nd displacement 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 will be greatly reduced, the Nd and Dy or Tb at the latter's main phase grain edge
Oxide or fluoride directly replace, replacing velocity is very slow, thus make seep Dy, seep Tb efficiency it is very low, the production time
It is long.And dysprosium used in the above method/terbium dosage is big, it is at high cost.
Summary of the invention
The object of the present invention is to provide a kind of methods of spray drying preparation performance Nd Fe B sintered magnet, by spraying
Nd Fe B alloys are made in drying process and powder containing heavy rare earth element is uniformly dispersed and is adsorbed on Nd Fe B alloys powder particle table
Performance Nd Fe B sintered magnet is made by sintering densification in the mixed powder in face, embodies heavy rare earth element and improves magnet magnetism
The best use of energy.
To achieve the above object, it is realized by following technological means：A kind of spray drying prepares high performance sintered neodymium-iron-boron
The method of magnet, includes the following steps：
1) nearly just dividing than 2:14:Nd Fe B alloys rapid-hardening flake is made using strip casting in 1 Nd Fe B alloys raw material；
2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；First alloy cast ingot is carried out rough and torn
It is broken, the antioxidant of 0.02wt%-0.70wt% is added, then air-flow is milled into the Nd Fe B alloys that average grain diameter is 3~5 μm
Powder.Wherein antioxidant is sodium sulfite, sodium pyrosulfite, dibutylphenol, sodium hydrogensulfite, sodium thiosulfate, tertiary fourth
One of base p-hydroxyanisole.
3) by Nd Fe B alloys powder and heavy rare earth metal powder or heavy rare earth compound powder according to mass ratio (100~
150)：1 is dissolved in 25~35min of ultrasonic disperse in a certain amount of ether, obtains slurries；The heavy rare earth metal powder or again
The granularity of rare earth compound powder is less than or equal to 10 microns, the heavy rare earth metal be dysprosium, in three kinds of elements of terbium and holmium extremely
Few one kind, the heavy rare earth compound are the heavy rare earth compound containing at least one of dysprosium, three kinds of elements of terbium and holmium.
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, 1.6~2T of magnetic field；The described equal static pressure, pressure is 200~300MPa；Described is true
Sky sintering, sintering temperature are 1040~1080 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 2~4 hours；Described time
Burning hot processing is 2 grades of tempering, and level-one is tempered 850~900 DEG C, and 450~550 DEG C of second annealing, the time is 2~4 hours.
The beneficial effects of the present invention are：The Nd Fe B alloys rapid-hardening flake of phase is prepared into through strip casting, by coarse crushing
With tiny Nd Fe B alloys particle is obtained after airflow milling, it is then mixed with heavy rare earth metal powder or heavy rare earth compound powder
Close that spray drying obtains heavy rare earth metal powder or heavy rare earth compound powder is dispersed in mixing between Nd Fe B alloys particle
Powder structure, mixed powder structure remain heavy rare earth metal powder or heavy rare earth compound powder more in the subsequent sintering process
It is dispersed in the intracorporal structure of magnet block, forms rich rare earth Grain-Boundary Phase, to improve the coercivity of magnet, that is, improves the magnetism of magnet
Energy.
The advantages of the present invention over the prior art are that：1) spray drying using high pressure by solvent or diluent after being atomized, with
In the contact of hot-air, ether rapid vaporization, powder disperses rapidly in the sky, and degree of scatter is high, and high production efficiency obtains composite powder
Body is uniformly mixed, and disperse phase is evenly distributed in magnet；2) spray drying carries out in closed container, and raw material producing level is high, institute
Need heavy rare earth raw material few, significant effect；3) gained magnet coercivity greatly improves, and remanent magnetism and magnetic energy product reduction are unobvious.
Specific embodiment
Invention is described in further detail below by specific embodiment, it is not to limit that following embodiment, which is descriptive,
Protection scope of the present invention of property.
Embodiment 1
A method of spray drying preparation performance Nd Fe B sintered magnet includes the following steps：
1) design is based on 2:14:The Nd Fe B alloys ingredient Nd11.76Fe82.36B5.88 (atomic percentage) of 1 phase, is pressed
According to the ingredient composition of design, the raw metal that purity is 99.9wt% is put into rapid hardening furnace and gets rid of band and is made with a thickness of 0.25mm's
Nd Fe B alloys thin slice；
2) 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 and grinds 2 hours Nd Fe B alloys for being made 5 μm in airflow milling
Powder.Wherein antioxidant selects sodium sulfite.
3) Nd Fe B alloys powder and granularity are less than or equal to 10 microns of DyF3Powder is according to mass ratio 150：1 is dissolved in
Ultrasonic disperse 25min, obtains slurries in a certain amount of ether；The additional amount (in mass) of the ether is Nd Fe B alloys powder
2.5 times.
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, magnetic field 1.6T；The equal static pressure, pressure 200MPa；The vacuum-sintering,
Sintering temperature is 1040~1080, and vacuum degree is at least 1 × 10-2Pa, when sintering time is 2；The tempering heat treatment is 2 grades and returns
Fire, level-one are tempered 850 DEG C, and 450 DEG C of second annealing, the time is 2 hours.
Comparative example 1
It by purity is 99.9wt%'s according to the proportion that alloying component is Nd11.76Fe82.36B5.88 (atomic percentage)
Raw metal carries out rapid hardening, hydrogen breaking, airflow milling, and magnetic field orientating molding waits static pressure, vacuum-sintering and tempering heat treatment, above-mentioned
Procedure parameter selection is identical as the parameter in embodiment 1, and traditional handicraft magnet sample as a comparison is made.
1 gained magnet of embodiment and 1 gained magnet of comparative example are subjected to magnetism testing, the results are shown in Table 1.
1 embodiment 1 of table and magnet magnetic property in comparative example 1
Embodiment 2
A method of spray drying preparation performance Nd Fe B sintered magnet includes the following steps：
1) design is based on 2:14:The Nd Fe B alloys ingredient Nd11.76Fe80.36B5.88Cu2 (atomic percentage) of 1 phase,
According to the ingredient composition of design, the raw metal that purity is 99.9wt% is put into rapid hardening furnace and gets rid of band and is made with a thickness of 0.25mm
Nd Fe B alloys thin slice；
2) above-mentioned alloy rapid-hardening flake is put into hydrogen broken furnace, leads to hydrogen stream 75ml/min, reacted 4 hours, hydrogen is broken to obtain 60
Mesh powder particle；Then the antioxidant of 0.15wt% is added, is transferred to and grinds the neodymium iron boron conjunction for being made 5 μm for 2 hours in airflow milling
Bronze end carries out powder processed, obtains Nd Fe B alloys powder, and antioxidant therein is sodium pyrosulfite；
3) the DyH3 powder by Nd Fe B alloys powder and granularity less than or equal to 10 microns is according to mass ratio 140：1 is dissolved in
Ultrasonic disperse 30min, obtains slurries in a certain amount of ether；
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, magnetic field 1.8T；The equal static pressure, pressure 220MPa；The vacuum-sintering,
Sintering temperature is 1050 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 2.5 hours；The tempering heat treatment is 2 grades and returns
Fire, level-one are tempered 860 DEG C, and 470 DEG C of second annealing, the time is 2.5 hours.
Comparative example 2
It is by purity according to the proportion that alloying component is Nd11.76Fe80.36B5.88Cu2 (atomic percentage)
The raw metal of 99.9wt% carries out rapid hardening, hydrogen breaking, airflow milling, and magnetic field orientating molding waits static pressure, vacuum-sintering and tempering heat
Processing, above process parameter selection is identical as the parameter in embodiment 2, and traditional handicraft magnet sample as a comparison is made.
2 gained magnet of embodiment and 2 gained magnet of comparative example are subjected to magnetism testing, the results are shown in Table 2.
2 embodiment 2 of table and magnet magnetic property in comparative example 2
Embodiment 3
A method of spray drying preparation performance Nd Fe B sintered magnet includes the following steps：
1) design is based on 2:14:The Nd Fe B alloys ingredient Nd9.76Pr2Fe80.36B5.88Al2 (atomic percent of 1 phase
Number), according to the ingredient composition of design, the raw metal that purity is 99.9wt% is put into rapid hardening furnace get rid of band be made with a thickness of
The Nd Fe B alloys thin slice of 0.25mm；
2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；First alloy cast ingot is carried out rough and torn
It is broken, the antioxidant of 0.30wt% is added, then air-flow is milled into the Nd Fe B alloys powder that average grain diameter is 3 μm, therein
Antioxidant is dibutylphenol；
3) the DyF3 powder by Nd Fe B alloys powder and granularity less than or equal to 10 microns is according to mass ratio 130：1 is dissolved in
Ultrasonic disperse 27min, obtains slurries in a certain amount of ether；
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, magnetic field 2T；The equal static pressure, pressure 240MPa；The vacuum-sintering is burnt
Junction temperature is 1060 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 3 hours；The tempering heat treatment is 2 grades of tempering,
Level-one is tempered 870 DEG C, and 490 DEG C of second annealing, the time is 3 hours.
Comparative example 3
It is by purity according to the proportion that alloying component is Nd9.76Pr2Fe80.36B5.88Al2 (atomic percentage)
The raw metal of 99.9wt% carries out rapid hardening, hydrogen breaking, airflow milling, and magnetic field orientating molding waits static pressure, vacuum-sintering and tempering heat
Processing, above process parameter selection is identical as the parameter in embodiment 3, and traditional handicraft magnet sample as a comparison is made.
3 gained magnet of embodiment and 3 gained magnet of comparative example are subjected to magnetism testing, the results are shown in Table 3.
3 embodiment 3 of table and magnet magnetic property in comparative example 3
Embodiment 4
A method of spray drying preparation performance Nd Fe B sintered magnet includes the following steps：
1) design is based on 2:14:The Nd Fe B alloys ingredient Dy1Nd9.76Pr1Fe81.36B5.88Al0.5Ga0.5 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 with a thickness of 0.25mm；
2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；First alloy cast ingot is carried out rough and torn
It is broken, the antioxidant of 0.40wt% is added, then air-flow is milled into the Nd Fe B alloys powder that average grain diameter is 4 μm.It is therein
Antioxidant is sodium hydrogensulfite.
3) the Dy2O3 powder by Nd Fe B alloys powder and granularity less than or equal to 10 microns is according to mass ratio 120：1 dissolution
Ultrasonic disperse 35min, obtains slurries in a certain amount of ether；
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, magnetic field 1.8T；The equal static pressure, pressure 250MPa；The vacuum-sintering,
Sintering temperature is 1070 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 4 hours；The tempering heat treatment is 2 grades and returns
Fire, level-one are tempered 890 DEG C, and 520 DEG C of second annealing, the time is 4 hours.
Comparative example 4
It will according to the proportion that alloying component is Dy1Nd9.76Pr1Fe81.36B5.88Al0.5Ga0.5 (atomic percentage)
The raw metal that purity is 99.9wt% carries out rapid hardening, hydrogen breaking, airflow milling, and magnetic field orientating molding waits static pressure, vacuum-sintering and
Tempering heat treatment, above process parameter selection is identical as the parameter in embodiment 4, and traditional handicraft magnet sample as a comparison is made.
4 gained magnet of embodiment and 4 gained magnet of comparative example are subjected to magnetism testing, the results are shown in Table 4.
4 embodiment 4 of table and magnet magnetic property in comparative example 4
Embodiment 5
A method of spray drying preparation performance Nd Fe B sintered magnet includes the following steps：
1) design is based on 2:14:The Nd Fe B alloys ingredient of 1 phase
Dy1Nd9.76Pr1Fe80.86B5.88Al0.5Ga0.5Co0.5 (atomic percentage), according to the ingredient composition of design, by purity
It is put into for the raw metal of 99.9wt% and gets rid of band in rapid hardening furnace Nd Fe B alloys thin slice with a thickness of 0.25mm is made；
2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；First alloy cast ingot is carried out rough and torn
It is broken, the antioxidant of 0.70wt% is added, then air-flow is milled into the Nd Fe B alloys powder that average grain diameter is 4 μm.It is therein
Antioxidant is sodium thiosulfate.
3) the TbF3 powder by Nd Fe B alloys powder and granularity less than or equal to 10 microns is according to mass ratio 110：1 is dissolved in
Ultrasonic disperse 35min, obtains slurries in a certain amount of ether；
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron is made in vacuum-sintering and tempering heat treatment
Boron permanent magnet.The magnetic field orientating molding, magnetic field 1.8T；The equal static pressure, pressure 250MPa；The vacuum-sintering,
Sintering temperature is 1080 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 2 hours；The tempering heat treatment is 2 grades and returns
Fire, level-one are tempered 900 DEG C, and 550 DEG C of second annealing, the time is 2 hours.
Comparative example 5
It is matching for Dy1Nd9.76Pr1Fe80.86B5.88Al0.5Ga0.5Co0.5 (atomic percentage) according to alloying component
Than the raw metal that purity is 99.9wt% is carried out rapid hardening, hydrogen breaking, airflow milling, magnetic field orientating molding waits static pressure, and vacuum is burnt
Knot and tempering heat treatment, above process parameter selection is identical as the parameter in embodiment 5, and traditional handicraft magnet is made as a comparison
Sample.
5 gained magnet of embodiment and 5 gained magnet of comparative example are subjected to magnetism testing, the results are shown in Table 5.
5 embodiment 5 of table and magnet magnetic property in comparative example 5
From the analysis of the data of above-described embodiment and comparative example it is found that the spray-dried magnet obtained for mixing heavy rare earth element
Magnetic property especially coercivity compared to improving a lot with magnet made from conventional method, i.e., using the method for spray drying I
High-performance neodymium iron boron sintered magnet has been made.
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 (7)
1. a kind of method of spray drying preparation performance Nd Fe B sintered magnet, which is characterized in that include the following steps：
1) nearly just dividing than 2:14:Nd Fe B alloys rapid-hardening flake is made using strip casting in 1 Nd Fe B alloys raw material；
2) above-mentioned alloy rapid-hardening flake is subjected to powder processed, obtains Nd Fe B alloys powder；
3) by Nd Fe B alloys powder and heavy rare earth metal powder or heavy rare earth compound powder according to mass ratio (100~150)：
1 is dissolved in 25~35min of ultrasonic disperse in a certain amount of ether, obtains slurries；
4) dry composite powder is made by spray drying in above-mentioned slurries；
5) above-mentioned composite powder is subjected to magnetic field orientating molding, waits static pressure, neodymium iron boron is made forever in vacuum-sintering and tempering heat treatment
Magnet.
2. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
Stating flouring technology is that alloy cast ingot is first carried out coarse crushing, the antioxidant of 0.02wt%-0.70wt% is added, then airflow milling
The Nd Fe B alloys powder that average grain diameter is 3~5 μm is made.
3. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
The granularity of the heavy rare earth metal powder or heavy rare earth compound powder stated is less than or equal to 10 microns, and the heavy rare earth metal is
At least one of three kinds of dysprosium, terbium and holmium elements, the heavy rare earth compound be containing in three kinds of dysprosium, terbium and holmium elements at least
A kind of heavy rare earth compound.
4. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
State magnetic field orientating molding, 1.6~2T of magnetic field.
5. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
The equal static pressure stated, pressure are 200~300MPa.
6. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
The vacuum-sintering stated, sintering temperature are 1040~1080 DEG C, and vacuum degree is at least 1 × 10-2Pa, sintering time are 2~4 hours.
7. the method for spray drying preparation performance Nd Fe B sintered magnet according to claim 1, which is characterized in that institute
Stating tempering heat treatment is 2 grades of tempering, and level-one is tempered 850~900 DEG C, and 450~550 DEG C of second annealing, the time is 2~4 hours.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370215A (en) * | 2020-01-06 | 2020-07-03 | 横店集团东磁股份有限公司 | Efficient method for manufacturing ferrite rubber-plastic magnetic powder |
| CN113571280A (en) * | 2021-07-23 | 2021-10-29 | 包头天和磁材科技股份有限公司 | Neodymium iron boron magnet coarse powder auxiliary agent, preparation method and application thereof, and preparation method of magnet |
| CN115483016A (en) * | 2022-10-13 | 2022-12-16 | 安徽省瀚海新材料股份有限公司 | Preparation method of sintered neodymium-iron-boron magnet |
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| CN113571280B (en) * | 2021-07-23 | 2024-02-13 | 包头天和磁材科技股份有限公司 | Neodymium-iron-boron magnet coarse powder auxiliary agent, preparation method and application thereof, and preparation method of magnet |
| CN115483016A (en) * | 2022-10-13 | 2022-12-16 | 安徽省瀚海新材料股份有限公司 | Preparation method of sintered neodymium-iron-boron magnet |
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