CN106782976A - A kind of preparation method of the neodymium iron boron magnetic body suitable for new-energy automobile - Google Patents
A kind of preparation method of the neodymium iron boron magnetic body suitable for new-energy automobile Download PDFInfo
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working
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- 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
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F9/00—Making metallic powder or suspensions thereof
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- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- 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
In particular it is a kind of preparation method of the neodymium iron boron magnetic body suitable for new-energy automobile the present invention relates to magnet steel production field.Praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium 0.3%, aluminium 0.6%, cobalt 2%, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% is weighed by weight percentage to be well mixed, and by fusing in vacuum induction spun furnace, reaction in cooling, the broken reacting furnace of hydrogen on copper wheel, addition oxidant, stirring, grind so as to obtain magnetic.Then by magnetic according to the big little makings model of product size, and in hermetically sealed, hypoxemia environment, suppressed by high magnetic field press, and high pressure by 20Mpa is pressed into density for 4.4 4.8g/cm3Raw embryo product；Enter in vacuum sintering furnace, under vacuum conditions, with 1,020 1045 DEG C of soaks 5 hours, 3 hours are incubated with 850 950 DEG C of middle temperature, with 500 560 DEG C of low-temperature insulations 5 hours, so as to obtain neodymium-iron-boron product made from steel.
Description
Technical field
In particular it is a kind of neodymium iron boron magnetic body suitable for new-energy automobile the present invention relates to magnet steel production field
Preparation method.
Background technology
In the machine field of new-energy automobile, the performance requirement to neodymium-iron-boron product made from steel is higher, existing magnetic and neodymium
Iron boron magnet steel properties of product cannot meet, and production cost is very high.
The content of the invention
The present invention solves the technical problem of the preparation for providing a kind of neodymium iron boron magnetic body suitable for new-energy automobile
Method, neodymium-iron-boron product made from steel is manufactured using homemade magnetic, so as to improve the performance of neodymium-iron-boron product made from steel and reduce produce
Cost.
The preparation method of a kind of neodymium iron boron magnetic body suitable for new-energy automobile, it is characterised in that comprise the following steps：
(1) weigh by weight percentage praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium 0.3%, aluminium 0.6%,
Cobalt 2%, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% are well mixed；
(2) material that step (1) is obtained is added in vacuum induction spun furnace, under vacuum conditions, Medium frequency induction adds
Temperature is to 1420-1500 DEG C of uniform melt and is incubated 6-14 minutes, obtains molten steel；
(3) molten steel that step (2) is obtained is cast on the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation,
Form the thick sheet products of 0.2-0.5mm；
(4) sheet products that step (3) is obtained are added in the broken reacting furnace of hydrogen, in the vacuum shape of vacuum≤0.9Pa
Under state, the hydrogen of sheet products weight 1/10th is filled with, the reactor of the broken reacting furnace of hydrogen rotates and reacts 20-40 minutes, arranged
Put hydrogen and vacuumize, be warming up to 550-650 DEG C, be incubated 5.5-7 hours, obtain thick magnetic of the granularity less than 10 microns；
(5) granularity obtained to step (4) adds 1-1.5ml in being less than 10 microns of thick magnetic by the thick magnetic of per kilogram
Oxidant amount addition oxidant, stir 30-40 minute, under hypoxia, by air-flow formation fluid bed make powder it
Between mutually collide, be ground to 2.6-2.9 microns of magnetic powder, sieved by 100 eye mesh screens and stirred 2.5-3.5 hours, obtain
Magnetic；
(6) magnetic for obtaining step (5) is according to the big little makings model of product size, and in hermetically sealed, hypoxemia environment
In, suppressed by high magnetic field press, and high pressure by 20Mpa is pressed into density for 4.4-4.8g/cm3Raw embryo produce
Product；
(7) the raw embryo product for obtaining step (6) is put into vacuum sintering furnace, under vacuum conditions, with 1020-1045 DEG C
Soak 5 hours, 3 hours are incubated with 850-950 DEG C of middle temperature, with 500-560 DEG C of low-temperature insulation 5 hours, so as to obtain neodymium iron
Boron magnet steel product.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
Praseodymium neodymium content >=99.5% in praseodymium neodymium metal described in Preparation Method.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
Described in Preparation Method under the vacuum state of vacuum≤2Pa, Medium frequency induction be warmed to 1420 DEG C or 1435 DEG C or 1455 DEG C or
1465 DEG C or 1475 DEG C or 1485 DEG C or 1500 DEG C of uniform melts are simultaneously incubated 10 minutes or 12 minutes, obtain molten steel.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
Casting on the copper wheel of rotation molten steel described in Preparation Method, room temperature is cooled to by blower fan and water circulation, described copper wheel
Rotating speed is that rotating speed is 40 revs/min, water temperature≤25 DEG C in water circulation.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
The content of the oxidant described in Preparation Method is per kilogram thick magnetic addition 1.3ml oxidants, hypoxia be amount of oxidation≤
10ppm。
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
Oxidant described in Preparation Method is metals against corrosion agent.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
Hypoxemia in step described in Preparation Method (6) is oxygen content≤0.02%, and highfield is magnetic field >=18000Gs, is under vacuum state
Vacuum≤0.003Pa.
As the further optimization of the technical program, a kind of system of neodymium iron boron magnetic body suitable for new-energy automobile of the invention
High temperature in step described in Preparation Method (7) is 1020 DEG C or 1023 DEG C or 1028 DEG C or 1035 DEG C or 1039 DEG C or 1045 DEG C, institute
Middle temperature is stated for 850 DEG C or 860 DEG C or 870 DEG C or 880 DEG C or 890 DEG C or 900 DEG C or 910 DEG C or 920 DEG C or 930 DEG C or 940 DEG C
Or 950 DEG C, the low temperature is 500 DEG C or 510 DEG C or 520 DEG C or 530 DEG C or 530 DEG C or 540 DEG C or 545 DEG C or 550 DEG C or 555
DEG C or 560 DEG C.
A kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile has the beneficial effect that：
A. by controlling the parameters such as material proportion, vacuum and reaction temperature, so as to improve the performance of product.
B. the final specific performance for obtaining product is magnetic parameter：Br：11.8-12.1kGs, HcJ：≥27.0kOe,
(BH)max：34.5-36MGo, Hk/HcJ：>=85%, density >=7.6g/cm3, elevated temperature strength：150 degree of hot demagnetization rate≤5%,
Corrosion resistant erosion degree：0.5 hydrochloric acid solution 100 hours is without obvious corrosion phenomenon, compression strength >=40Mpa.
Specific embodiment
In particular it is a kind of neodymium iron boron magnetic body suitable for new-energy automobile the present invention relates to magnet steel production field
Preparation method.
In order to solve the above technical problems, a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile of the invention,
It is characterised in that it includes following steps：
(1) weigh by weight percentage praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium 0.3%, aluminium 0.6%,
Cobalt 2%, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% are well mixed；It is well mixed；By experiment test, material
Ratio according to above-mentioned mixing, the properties of product for obtaining are preferable.The ratio regular meeting of various materials directly affects the magnetic of final products
Can parameter.
(2) material that step (1) is obtained is added in vacuum induction spun furnace, under vacuum conditions, Medium frequency induction adds
Temperature is to 1420-1500 DEG C of uniform melt and is incubated 6-14 minutes, obtains molten steel；Vacuum is too high to make that product recovery rate is low, produce
Product oxidation, slice, thin piece skin color it is poor, nigrescence, finally influence properties of product.Vacuum is too low to be increased production cost and reduce life
Produce efficiency, by after contrast it is final draw vacuum reach step (2) scope it is the most reasonable.Temperature is too high or overlong time is produced
Raw result：Make molten steel burning influence structure, influence properties of product, bleed-out liquid to cause potential safety hazard, walked after producing contrast
Suddenly the temperature and time scope of (2) is the most reasonable.
(3) molten steel that step (2) is obtained is cast on the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation,
Form the thick sheet products of 0.2-0.5mm；
(4) sheet products that step (3) is obtained are added in the broken reacting furnace of hydrogen, in the vacuum shape of vacuum≤0.9Pa
Under state, the hydrogen of sheet products weight 1/10th is filled with, the reactor of the broken reacting furnace of hydrogen rotates and reacts 20-40 minutes, so
Hydrogen is discharged afterwards and is vacuumized, then heat to 550-650 DEG C, be incubated 5.5-7 hours, obtain granularity thick less than 10 microns
Magnetic；The result of the too high generation of vacuum：Powder is aoxidized, and powder spontaneous combustion finally influences properties of product.Vacuum is too low to be increased
Production cost and reduce production efficiency, by after contrast it is final draw vacuum reach step (4) standard it is the most reasonable.
(5) granularity obtained to step (4) adds 1-1.5ml in being less than 10 microns of thick magnetic by the thick magnetic of per kilogram
Oxidant amount addition oxidant, stir 30-40 minute, under hypoxia, by air-flow formation fluid bed make powder it
Between mutually collide, be ground to 2.6-2.9 microns of magnetic powder, sieved by 100 eye mesh screens and stirred 2.5-3.5 hours, obtain
Magnetic.The appropriate oxidant of addition can improve the corrosion resistant erosion degree of product.
As the further optimization of the technical program, praseodymium in the praseodymium neodymium metal described in a kind of manufacture method of magnetic of the invention
Neodymium content >=99.5%.Find that praseodymium neodymium content, dysprosium content, Boron contents and content of niobium are too low by experimental study and the manufacturing
The performance of this product can be influenceed, and causes manufacturing cost to increase.
As the further optimization of the technical program, described in a kind of manufacture method of magnetic of the invention vacuum≤
Under the vacuum state of 2Pa, Medium frequency induction is warmed to 1420 DEG C or 1435 DEG C or 1455 DEG C or 1465 DEG C or 1475 DEG C or 1485 DEG C
Or 1500 DEG C of uniform melts and be incubated 10 minutes or 12 minutes, obtain molten steel.Found by experimental study and the manufacturing, vacuum
The vacuum state of degree≤2Pa is ideal, and preferably Medium frequency induction be warmed to 1420 DEG C or 1435 DEG C or 1455 DEG C or
1465 DEG C or 1475 DEG C or 1485 DEG C or 1500 DEG C of uniform melts are simultaneously incubated 10 minutes or 12 minutes, the molten steel performance of acquisition
It is best.
As the further optimization of the technical program, molten steel being cast in described in a kind of manufacture method of magnetic of the invention
On the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation, the rotating speed of described copper wheel is that rotating speed is 40 revs/min, and water is followed
Water temperature≤25 DEG C in ring.The excessively slow mistake of the rotating speed of copper wheel causes production efficiency low, and rotating speed is too fast to cause cooling-down effect up to not
To and influence the performance of product.Rational control water temperature, so as to control the molten steel cooling velocity can to improve properties of product.By not
Disconnected experiment and production, show that the rotating speed of copper wheel is 40 revs/min, the properties of product that water temperature≤25 DEG C in water circulation obtain for rotating speed
Preferably.
As the further optimization of the technical program, the content of the oxidant described in a kind of manufacture method of magnetic of the invention
It is the thick magnetic addition 1.3ml oxidants of per kilogram, hypoxia is amount of oxidation≤10PPm.
Used as the further optimization of the technical program, the oxidant described in a kind of manufacture method of magnetic of the invention is metal
Corrosion inhibitor, the corrosion resistant erosion degree for improving product.
Using the method that the magnetic of above-mentioned manufacture produces neodymium-iron-boron product made from steel, it is characterised in that comprise the following steps：
(a) by magnetic according to the big little makings model of product size, and in hermetically sealed, hypoxemia environment, by highfield
Press is suppressed, and high pressure by 20Mpa is pressed into density for 4.4-4.8g/cm3Raw embryo product；
B raw embryo product that () obtains step (a) is put into vacuum sintering furnace, under vacuum conditions, with 1020-1045 DEG C
Soak 5 hours, 3 hours are incubated with 850-950 DEG C of middle temperature, with 500-560 DEG C of low-temperature insulation 5 hours, so as to obtain neodymium iron
Boron magnet steel product.
It is low described in a kind of method for producing neodymium-iron-boron product made from steel of the present invention as the further optimization of the technical program
Oxygen is oxygen content≤0.02%, and highfield is magnetic field >=18000Gs, is vacuum≤0.003Pa under vacuum state.Oxygen content,
Magnetic field intensity and vacuum can influence the performance of this product, by constantly experiment and production, show that above-mentioned arranging effect is preferable.
As the further optimization of the technical program, the height described in a kind of method for producing neodymium-iron-boron product made from steel of the present invention
Temperature is 1020 DEG C or 1023 DEG C or 1028 DEG C or 1035 DEG C or 1039 DEG C or 1045 DEG C, the middle temperature for 850 DEG C or 860 DEG C or
870 DEG C or 880 DEG C or 890 DEG C or 900 DEG C or 910 DEG C or 920 DEG C or 930 DEG C or 940 DEG C or 950 DEG C, the low temperature are 500 DEG C
Or 510 DEG C or 520 DEG C or 530 DEG C or 530 DEG C or 540 DEG C or 545 DEG C or 550 DEG C or 555 DEG C or 560 DEG C.The height meeting of temperature
The performance of product is directly affected, by constantly experiment and production, show that above-mentioned arranging effect is preferable.
The specific case of following discloses two：
Case one：A kind of manufacture method of magnetic, comprises the following steps：
(1) praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium 0.46%, aluminium are weighed by weight percentage
0.6%th, cobalt 2%, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% are well mixed；It is well mixed；In praseodymium neodymium metal
Praseodymium neodymium content >=99.5%.
(2) material that step (1) is obtained is added in vacuum induction spun furnace, in the vacuum state of vacuum≤2Pa
Under, Medium frequency induction is warmed to 1435 DEG C of uniform melts and is incubated 10 minutes, obtains molten steel.
(3) molten steel that step (2) is obtained is cast on the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation,
Form the thick sheet products of 0.2-0.5mm；The rotating speed of copper wheel is that rotating speed is 40 revs/min, water temperature≤25 DEG C in water circulation.
(4) sheet products that step (3) is obtained are added in the broken reacting furnace of hydrogen, in the vacuum shape of vacuum≤0.9Pa
Under state, the hydrogen of sheet products weight 1/10th is filled with, the reactor of the broken reacting furnace of hydrogen rotates and reacts 20-40 minutes, so
Hydrogen is discharged afterwards and is vacuumized, then heat to 550-650 DEG C, be incubated 5.5-7 hours, obtain granularity thick less than 10 microns
Magnetic；
(5) granularity obtained to step (4) adds 1.3ml's in being less than 10 microns of thick magnetic by the thick magnetic of per kilogram
The amount addition metals against corrosion agent of metals against corrosion agent, stirs 30-40 minutes, under the hypoxia of amount of oxidation≤10PPm, warp
Crossing air-flow formation fluid bed makes mutually to be collided between powder, 2.6-2.9 microns of magnetic powder is ground to, by 100 eye mesh screen mistakes
Sieve and stir 2.5-3.5 hours, obtain magnetic.
(6) by magnetic according to the big little makings model of product size, and in hermetically sealed, oxygen content≤0.02% low-oxygen environment
In, suppressed by the high magnetic field press of magnetic field >=18000Gs, and high pressure by 20Mpa is pressed into density for 4.4-
4.8g/cm3Raw embryo product；
(7) the raw embryo product for obtaining step (6) is put into vacuum sintering furnace, in the vacuum shape of vacuum≤0.003Pa
Under state, with 1023 DEG C of soaks 5 hours, 3 hours are incubated with 860 DEG C of middle temperature, with 510 DEG C of low-temperature insulations 5 hours, so as to obtain
Neodymium-iron-boron product made from steel.
The magnetic property that the present invention is obtained：Br：11.85-12.0kGs；HcJ≥28.5kOe；(BH)max：34.6-
35.8MGo；Hk/HcJ：>=91%.
Case two：A kind of manufacture method of magnetic, comprises the following steps：
(1) weigh by weight percentage praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium 0.3%, aluminium 0.6%,
Cobalt 2%, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% are well mixed；It is well mixed；Praseodymium neodymium contains in praseodymium neodymium metal
Amount >=99.5%, dysprosium content >=80% in dysprosium ferrous metal, Boron contents >=20% in ferro-boron metal, content of niobium in ferro-niobium metal >=
65%.
(2) material that step (1) is obtained is added in vacuum induction spun furnace, in the vacuum state of vacuum≤2Pa
Under, Medium frequency induction is warmed to 1485 DEG C of uniform melts and is incubated 12 minutes, obtains molten steel.
(3) molten steel that step (2) is obtained is cast on the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation,
Form the thick sheet products of 0.2-0.5mm；The rotating speed of copper wheel is that rotating speed is 40 revs/min, water temperature≤25 DEG C in water circulation.
(4) sheet products that step (3) is obtained are added in the broken reacting furnace of hydrogen, in the vacuum shape of vacuum≤0.9Pa
Under state, the hydrogen of sheet products weight 1/10th is filled with, the reactor of the broken reacting furnace of hydrogen rotates and reacts 20-40 minutes, so
Hydrogen is discharged afterwards and is vacuumized, then heat to 550-650 DEG C, be incubated 5.5-7 hours, obtain granularity thick less than 10 microns
Magnetic；
(5) granularity obtained to step (4) adds 1.3ml's in being less than 10 microns of thick magnetic by the thick magnetic of per kilogram
The amount addition metals against corrosion agent of metals against corrosion agent, stirs 30-40 minutes, under the hypoxia of amount of oxidation≤10PPm, warp
Crossing air-flow formation fluid bed makes mutually to be collided between powder, 2.6-2.9 microns of magnetic powder is ground to, by 100 eye mesh screen mistakes
Sieve and stir 2.5-3.5 hours, obtain magnetic.
(6) by magnetic according to the big little makings model of product size, and in hermetically sealed, oxygen content≤0.02% low-oxygen environment
In, suppressed by the high magnetic field press of magnetic field >=18000Gs, and high pressure by 20Mpa is pressed into density for 4.4-
4.8g/cm3Raw embryo product；
(7) the raw embryo product for obtaining step (6) is put into vacuum sintering furnace, in the vacuum shape of vacuum≤0.003Pa
Under state, with 1035 DEG C of soaks 5 hours, 3 hours are incubated with 870 DEG C of middle temperature, with 555 DEG C of low-temperature insulations 5 hours, so as to obtain
Neodymium-iron-boron product made from steel.
The magnetic property that the present invention is obtained：Br：11.9-12.1kGs；HcJ≥29kOe；(BH)max：34.2-35.5MGo；
Hk/HcJ：>=90.5%.
Certainly, described above not limitation of the present invention, the present invention is also not limited to the example above, the art
Change, remodeling, addition or replacement that those of ordinary skill is made in essential scope of the invention, fall within guarantor of the invention
Shield scope.
Claims (8)
1. the preparation method of a kind of neodymium iron boron magnetic body suitable for new-energy automobile, it is characterised in that：
(1) praseodymium neodymium metal 28.25%, dysprosium 2.75%, boron 0.98%, niobium are weighed by weight percentage：0.3%th, aluminium 0.6%, cobalt
2%th, copper 0.2%, terbium 0.25%, gallium 0.2%, pure iron 64.47% are well mixed；
(2) material that step (1) is obtained is added in vacuum induction spun furnace, under vacuum conditions, Medium frequency induction is warmed to
1420-1500 DEG C of uniform melt is simultaneously incubated 6-14 minutes, obtains molten steel；
(3) molten steel that step (2) is obtained is cast on the copper wheel of rotation, room temperature is cooled to by blower fan and water circulation, formed
0.2-0.5mm thick sheet products；
(4) sheet products that step (3) is obtained are added in the broken reacting furnace of hydrogen, under the vacuum state of vacuum≤0.9Pa,
The hydrogen of sheet products weight 1/10th is filled with, the reactor of the broken reacting furnace of hydrogen rotates and reacts 20-40 minutes, discharges hydrogen
And vacuumize, 550-650 DEG C is warming up to, 5.5-7 hours is incubated, obtain thick magnetic of the granularity less than 10 microns；
(5) oxygen of 1-1.5ml is added in thick magnetic of the granularity for obtaining to step (4) less than 10 microns by the thick magnetic of per kilogram
The amount addition oxidant of agent, stirs 30-40 minute, under hypoxia, phase between powder is made by air-flow formation fluid bed
Mutually collision, is ground to 2.6-2.9 microns of magnetic powder, is sieved by 100 eye mesh screens and stirred 2.5-3.5 hours, obtains magnetic；
(6) magnetic for obtaining step (5) is passed through according to the big little makings model of product size, and in hermetically sealed, hypoxemia environment
Cross high magnetic field press compacting, and high pressure by 20Mpa is pressed into density for 4.4-4.8g/cm3Raw embryo product；
(7) the raw embryo product for obtaining step (6) is put into vacuum sintering furnace, under vacuum conditions, with 1020-1045 DEG C of high temperature
Insulation 5 hours, with 850-950 DEG C of middle temperature insulation 3 hours, with 500-560 DEG C of low-temperature insulation 5 hours, so as to obtain neodymium-iron-boron
Product made from steel.
2. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：Praseodymium neodymium content >=99.5% in described praseodymium neodymium metal.
3. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：It is described under the vacuum state of vacuum≤2Pa, Medium frequency induction is warmed to 1420 DEG C or 1435 DEG C or 1455 DEG C or 1465
DEG C or 1475 DEG C or 1485 DEG C or 1500 DEG C of uniform melts and be incubated 10 minutes or 12 minutes, obtain molten steel.
4. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：Described casts on the copper wheel of rotation molten steel, and room temperature is cooled to by blower fan and water circulation, the rotating speed of described copper wheel
For rotating speed is 40 revs/min, water temperature≤25 DEG C in water circulation.
5. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：The content of described oxidant is the thick magnetic addition 1.3ml oxidants of per kilogram, and hypoxia is amount of oxidation≤10ppm.
6. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：Described oxidant is metals against corrosion agent.
7. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：Hypoxemia in the step (6) is oxygen content≤0.02%, and highfield is magnetic field >=18000Gs, is vacuum under vacuum state
Degree≤0.003Pa.
8. a kind of preparation method of neodymium iron boron magnetic body suitable for new-energy automobile according to claim 1, its feature exists
In：High temperature in the step (7) is 1020 DEG C or 1023 DEG C or 1028 DEG C or 1035 DEG C or 1039 DEG C or 1045 DEG C, it is described in
Temperature is 850 DEG C or 860 DEG C or 870 DEG C or 880 DEG C or 890 DEG C or 900 DEG C or 910 DEG C or 920 DEG C or 930 DEG C or 940 DEG C or 950
DEG C, the low temperature be 500 DEG C or 510 DEG C or 520 DEG C or 530 DEG C or 530 DEG C or 540 DEG C or 545 DEG C or 550 DEG C or 555 DEG C or
560℃。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240470A (en) * | 2017-07-12 | 2017-10-10 | 浙江中科磁业有限公司 | A kind of low weightless Sintered NdFeB magnet and preparation method |
| CN107610865A (en) * | 2017-10-16 | 2018-01-19 | 包头稀土研究院 | The preparation method of Nd-Fe-B permanent magnet material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0421744A (en) * | 1990-05-16 | 1992-01-24 | Daido Steel Co Ltd | Rare earth magnetic alloy excellent in hot workability |
| CN102586682A (en) * | 2011-01-17 | 2012-07-18 | 三环瓦克华（北京）磁性器件有限公司 | High-performance rare earth permanent magnet sintered magnet and manufacturing method thereof |
| CN105741995A (en) * | 2016-04-27 | 2016-07-06 | 宁波耐力誉磁业科技有限公司 | High-performance sintered neodymium-iron-boron permanent magnet and preparation method thereof |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0421744A (en) * | 1990-05-16 | 1992-01-24 | Daido Steel Co Ltd | Rare earth magnetic alloy excellent in hot workability |
| CN102586682A (en) * | 2011-01-17 | 2012-07-18 | 三环瓦克华（北京）磁性器件有限公司 | High-performance rare earth permanent magnet sintered magnet and manufacturing method thereof |
| CN105741995A (en) * | 2016-04-27 | 2016-07-06 | 宁波耐力誉磁业科技有限公司 | High-performance sintered neodymium-iron-boron permanent magnet and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240470A (en) * | 2017-07-12 | 2017-10-10 | 浙江中科磁业有限公司 | A kind of low weightless Sintered NdFeB magnet and preparation method |
| CN107610865A (en) * | 2017-10-16 | 2018-01-19 | 包头稀土研究院 | The preparation method of Nd-Fe-B permanent magnet material |
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Application publication date: 20170531 |