CN108389709A - The preparation method of low-carbon Sintered NdFeB magnet - Google Patents

The preparation method of low-carbon Sintered NdFeB magnet Download PDF

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CN108389709A
CN108389709A CN201711448299.7A CN201711448299A CN108389709A CN 108389709 A CN108389709 A CN 108389709A CN 201711448299 A CN201711448299 A CN 201711448299A CN 108389709 A CN108389709 A CN 108389709A
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powder
preparation
raw material
rare earths
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贺琦军
林建强
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NINGBO ZHAOBAO MAGNET Co Ltd
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NINGBO ZHAOBAO MAGNET Co Ltd
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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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a kind of preparation methods of low-carbon Sintered NdFeB magnet, include the following steps：Preparation raw material is matched according to Nd Fe B alloys；Rare earths material in raw material is put into 1 2h of ball milling in high energy ball mill with a certain amount of high-purity Si powder, the powder of rare earths material containing Si is made, is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；The alloy cast ingot of gained or rapid-hardening flake are carried out hydrogen to be crushed, and dehydrogenation is carried out to the broken alloy powder of hydrogen；Alloy powder after Dehydroepiandrosterone derivative is mixed with the rare earths material containing Si of gained powder, and lubricant is added, antioxidant；The powder mixed is ground using airflow milling, the powder after airflow milling is placed in batch mixer and is mixed, is placed in vertical orientation in magnetic field, die mould is at blank；The good blank of die mould is placed in vacuum and is sintered, double tempering heat treatment is used after sintering, obtains neodymium iron boron magnetic body.

Description

The preparation method of low-carbon Sintered NdFeB magnet
Technical field
The present invention relates to technical field of magnetic materials, more specifically, it relates to the preparation of low-carbon Sintered NdFeB magnet Method.
Background technology
As the Nd-Fe-B rare earth permanent magnetic material of third generation rare earth permanent-magnetic material, since nineteen eighty-three by SUMITOMO CHEMICAL metal and Since GM companies of U.S. commercialized development first, due to having the characteristics that high remanence, high coercivity and high magnetic energy product, extensive use In fields such as power electronics, communication, information, motor, communications and transportation, office automation, medical instrument, military affairs, and keep some small The application of type, highly integrated new high-tech product is possibly realized, such as hard disk voice coil motor (VCM), hybrid vehicle (HEV), electric vehicle etc..Meet the above market demand, it would be desirable to prepared with lower cost be provided simultaneously with high remanent magnetism and The neodymium iron boron magnetic body of high-coercive force.
So far, people generally improve the comprehensive performance of neodymium iron boron magnetic body by the addition of various elements and infiltration, realize Coercivity is improved in the case that not reducing remanent magnetism, the temperature coefficient of coercivity and remanent magnetism is reduced, improves its corrosion resistance and stabilization Property.However another key factor for influencing neodymium iron boron magnetic body performance is the phosphorus content of raw material, the main rare earth of neodymium iron boron magnetic body Phosphorus content in raw material is excessively high, can reduce the magnetic energy product of neodymium iron boron magnetic body, have an adverse effect to magnetic property.Existing technology hand Section is the rare earths material using low carbon content, but such cost is relatively high, thus how to be realized in original rare earths material The upper effect for realizing low-carbon, preparing low-carbon neodymium iron boron magnetic body is particularly important.
Invention content
The object of the present invention is to provide the systems of a kind of remanent magnetism at low cost, high, the low-carbon Sintered NdFeB magnet of high-coercive force Preparation Method.
To achieve the above object, it is realized by following technological means：
A kind of preparation method of low-carbon Sintered NdFeB magnet, includes the following steps：
1) preparation raw material is matched according to Nd Fe B alloys；
2) rare earths material in raw material is put into ball milling 1-2h in high energy ball mill with a certain amount of high-purity Si powder, is made and contains Si rare earths material powder, the addition of the Si are the 0.1%-3% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is carried out Dehydrogenation；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and be added Lubricant, antioxidant；
6) powder mixed is ground using airflow milling, and oxygen is added to reduce particle table during airflow milling The activity in face；
7) powder after airflow milling is placed in batch mixer and is mixed, be placed in vertical orientation in magnetic field, die mould is at blank；
8) the good blank of die mould is placed in vacuum and is sintered, double tempering heat treatment is used after sintering, obtains neodymium-iron-boron Body.
Advanced optimize for：Temperature when in step 4) to broken alloy dehydrogenation is 500-550 DEG C, and dehydrogenation time is 3.0-3.5 hour.
Advanced optimize for：The addition of lubricant is the 0.05%- of all raw material alloy powder total weights in step 5) 0.1%, the addition of antioxidant is the 0-0.5% of all raw material alloy powder total weights.
Advanced optimize for：When the powder mixed being ground using airflow milling in step 6), the particle after grinding Degree is 2-8 μm, and a concentration of 10-80ppm of oxygen is added.
Advanced optimize for：Mixing time is 60-80min, alignment magnetic field 1.5-2.0T in step 7).
Advanced optimize for：When being sintered the good blank of die mould in step 8), the temperature of sintering is 1020-1150 DEG C, sintering time is 5.0-6.5 hours, and double tempering heat treatment is specially：Air quenching is extremely after keeping the temperature 3-4 hours at 850-900 DEG C Room temperature, then after being warming up to 460-540 DEG C of heat preservation 3-4 hours air quenching to room temperature.
Advanced optimize for：The mass percent of the Nd Fe B alloys ingredient is ((PrNd)1-mREm)aFebMcBd, Middle RE be thulium, M Al, Co, Si, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, It is one or more in Sb, Hf, Ta, W, Pt, Au, Pb and Bi, and the 0 ＜ ＜ of m≤0.1,28≤a≤33,0 c≤7,0 ＜ d≤ 1.5, b=100-a-c-d.
Beneficial effects of the present invention are：The advantages of the present invention over the prior art are that in advance and Si by rare earths material Powder carries out mechanical mill alloying, and Si can be reacted with the carbon in rare earths material generates SiC, and the carbon in rare earths material is locked, So that the carbon in rare earths material is precipitated, phosphorus content is few in the neodymium iron boron crystal grain generated in subsequent reactions, and a large amount of carbon are formed by SiC is uniformly distributed in grain boundaries, plays the role of enhancing matrix, Si powder and the synergistic effect of former Nd Fe B alloys improve magnet Comprehensive performance.It is at low cost that this method prepares Sintered NdFeB magnet, simple for process, is suitble to large-scale production.
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
A kind of preparation method of low-carbon Sintered NdFeB magnet, includes the following steps：
1) preparation raw material is matched according to Nd Fe B alloys, the mass percent of Nd Fe B alloys ingredient is ((PrNd)0.95Dy0.05)28Fe66Co2Cu3B；
2) rare earths material in raw material is put into ball milling 1h in high energy ball mill with a certain amount of high-purity Si powder, be made containing Si Rare earths material powder, the addition of the Si are the 0.1% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is carried out Dehydrogenation, temperature when alloy dehydrogenation are 500 DEG C, and dehydrogenation time is 3.0 hours；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and be added Lubricant, antioxidant, the addition of lubricant are the 0.05% of all raw material alloy powder total weights, the addition of antioxidant Amount is the 0.01% of all raw material alloy powder total weights；
6) it is 6-8 μm to be ground the powder mixed to granularity using airflow milling, and is added during airflow milling Enter oxygen to reduce the activity of particle surface, a concentration of 20ppm of oxygen is added；
7) powder after airflow milling is placed in batch mixer after mixing 80min, is placed in vertical orientation in the magnetic fields 2T, die mould at Blank；
8) the good blank of die mould is placed in vacuum and is sintered, be using double tempering heat treatment, the temperature of sintering after sintering 1020 DEG C, sintering time is 5.0 hours, and double tempering heat treatment is specially：Air quenching is to room temperature after keeping the temperature 3.5 hours at 900 DEG C, Air quenching is to room temperature after being warming up to 540 DEG C of heat preservations 4 hours again, finally obtained neodymium iron boron magnetic body A1.
Embodiment 2
A kind of preparation method of low-carbon Sintered NdFeB magnet, includes the following steps：
1) preparation raw material is matched according to Nd Fe B alloys, the mass percent of Nd Fe B alloys ingredient is ((PrNd)0.90Dy0.05Tb0.05)28Fe66Ga2In2.85B1.15；
2) rare earths material in raw material is put into ball milling 1h in high energy ball mill with a certain amount of high-purity Si powder, be made containing Si Rare earths material powder, the addition of the Si are the 0.2% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is carried out Dehydrogenation, temperature when alloy dehydrogenation are 520 DEG C, and dehydrogenation time is 3.2 hours；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and be added Lubricant, antioxidant, the addition of lubricant are the 0.06% of all raw material alloy powder total weights, the addition of antioxidant Amount is the 0.1% of all raw material alloy powder total weights；
6) it is 6-8 μm to be ground the powder mixed to granularity using airflow milling, and is added during airflow milling Enter oxygen to reduce the activity of particle surface, a concentration of 60ppm of oxygen is added；
7) powder after airflow milling is placed in batch mixer after mixing 80min, is placed in vertical orientation in the magnetic fields 1.8T, die mould At blank；
8) the good blank of die mould is placed in vacuum and is sintered, be using double tempering heat treatment, the temperature of sintering after sintering 1050 DEG C, sintering time is 6.0 hours, and double tempering heat treatment is specially：Air quenching is to room temperature after keeping the temperature 4 hours at 850 DEG C, then Air quenching is to room temperature after being warming up to 540 DEG C of heat preservations 4 hours, finally obtained neodymium iron boron magnetic body A2.
Embodiment 3
A kind of preparation method of low-carbon Sintered NdFeB magnet, includes the following steps：
1) preparation raw material is matched according to Nd Fe B alloys, the mass percent of Nd Fe B alloys ingredient is ((PrNd)0.80Dy0.15Y0.05)28Fe66Ag2Ti2.85B1.15；
2) rare earths material in raw material is put into ball milling 1h in high energy ball mill with a certain amount of high-purity Si powder, be made containing Si Rare earths material powder, the addition of the Si are the 0.3% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is carried out Dehydrogenation, temperature when alloy dehydrogenation are 530 DEG C, and dehydrogenation time is 3.3 hours；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and be added Lubricant, antioxidant, the addition of lubricant are the 0.08% of all raw material alloy powder total weights, the addition of antioxidant Amount is the 0.3% of all raw material alloy powder total weights；
6) it is 6-8 μm to be ground the powder mixed to granularity using airflow milling, and is added during airflow milling Enter oxygen to reduce the activity of particle surface, a concentration of 50ppm of oxygen is added；
7) powder after airflow milling is placed in batch mixer after mixing 60min, is placed in vertical orientation in the magnetic fields 1.5T, die mould At blank；
8) the good blank of die mould is placed in vacuum and is sintered, be using double tempering heat treatment, the temperature of sintering after sintering 1150 DEG C, sintering time is 5.0 hours, and double tempering heat treatment is specially：Air quenching is to room temperature after keeping the temperature 3 hours at 900 DEG C, then Air quenching is to room temperature after being warming up to 460 DEG C of heat preservations 4 hours, finally obtained neodymium iron boron magnetic body A3.
Embodiment 4
A kind of preparation method of low-carbon Sintered NdFeB magnet, includes the following steps：
1) preparation raw material is matched according to Nd Fe B alloys, the mass percent of Nd Fe B alloys ingredient is ((PrNd)0.90Dy0.05Ho0.05)28Fe65.97Nb0.3Zr0.2Cu0.2B1.03；
2) rare earths material in raw material is put into ball milling 2h in high energy ball mill with a certain amount of high-purity Si powder, be made containing Si Rare earths material powder, the addition of the Si are the 0.5% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is carried out Dehydrogenation, temperature when alloy dehydrogenation are 540 DEG C, and dehydrogenation time is 3.4 hours；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and be added Lubricant, antioxidant, the addition of lubricant are the 0.1% of all raw material alloy powder total weights, the addition of antioxidant Amount is the 0.5% of all raw material alloy powder total weights；
6) it is 6-8 μm to be ground the powder mixed to granularity using airflow milling, and is added during airflow milling Enter oxygen to reduce the activity of particle surface, a concentration of 60ppm of oxygen is added；
7) powder after airflow milling is placed in batch mixer after mixing 80min, is placed in vertical orientation in the magnetic fields 2T, die mould at Blank；
8) the good blank of die mould is placed in vacuum and is sintered, be using double tempering heat treatment, the temperature of sintering after sintering 1100 DEG C, sintering time is 6.5 hours, and double tempering heat treatment is specially：Air quenching is to room temperature after keeping the temperature 4 hours at 870 DEG C, then Air quenching is to room temperature after being warming up to 520 DEG C of heat preservations 4 hours, finally obtained neodymium iron boron magnetic body A4.
Neodymium iron boron magnetic body A1-A4 and existing neodymium iron boron magnetic body B1-B4 prepared by above-described embodiment 1~4 is subjected to magnetic respectively Performance test, test result are as shown in table 1.Difference lies in be not added with high-purity Si powder with embodiment 1 by wherein neodymium iron boron magnetic body B1 High-energy ball milling is carried out with rare earths material, i.e. sample name group becomes ((PrNd)0.95Dy0.05)28Fe66Co2Cu3B, according to nominal group At dispensing, melting, broken powder, die mould, sintering and tempering processed is carried out, technological parameter is same as Example 1, neodymium iron boron magnetic body B2 The difference from example 2 is that be not added with high-purity Si powder carries out high-energy ball milling with rare earths material, i.e. sample name group becomes ((PrNd)0.90Dy0.05Tb0.05)28Fe66Ga2In2.85B1.15, formed according to name carry out dispensing, melting, broken powder processed, die mould, Sintering and tempering, technological parameter is same as Example 2, and neodymium iron boron magnetic body B3 is high-purity difference lies in being not added with embodiment 3 Si powder carries out high-energy ball milling with rare earths material, i.e. sample name group becomes ((PrNd)0.80Dy0.15Y0.05)28Fe66Ag2Ti2.85B1.15, formed according to name and carry out dispensing, melting, be crushed powder, die mould, sintering and tempering processed, technological parameter Same as Example 3, neodymium iron boron magnetic body B4 carries out height difference lies in high-purity Si powder is not added with embodiment 4 with rare earths material Energy ball milling, i.e. sample name group become ((PrNd)0.90Dy0.05Ho0.05)28Fe65.97Nb0.3Zr0.2Cu0.2B1.03, according to nominal group At dispensing, melting, broken powder, die mould, sintering and tempering processed is carried out, technological parameter is same as Example 4.
The magnetism testing result of table 1 neodymium iron boron magnetic body A1-A4 and B1-B4
Magnetic property Br(KGs) Hcj(KOe) BHmax(MGOe) Hk/Hcj
A1 13.73 23.94 44.12 0.95
B1 11.27 21.87 40.23 0.94
A2 13.68 24.17 44.08 0.94
B2 11.25 21.98 40.12 0.95
A3 13.60 25.80 43.99 0.95
B3 11.22 22.03 39.98 0.94
A4 13.67 25.32 44.13 0.95
B4 11.21 22.01 40.12 0.94
As can be seen from the above table, through high-purity Si in advance with neodymium iron boron magnetic body ratio obtained after rare earths material mechanical alloying not The magnetic property for adding high-purity Si progress mechanical alloying is superior, illustrates to carry out mechanical alloy with rare earths material in advance using high-purity Si High performance neodymium iron boron magnetic body can be made in the preparation method of change.
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 preparation method of low-carbon Sintered NdFeB magnet, which is characterized in that include the following steps：
1) preparation raw material is matched according to Nd Fe B alloys；
2) rare earths material in raw material is put into ball milling 1-2h in high energy ball mill with a certain amount of high-purity Si powder, be made dilute containing Si Native raw material powder, the addition of the Si are the 0.1%-3% of rare earths material；
3) it is alloy cast ingot or rapid-hardening flake by other raw materials in raw material together melting；
4) by obtained by step 3) alloy cast ingot or rapid-hardening flake to carry out hydrogen broken, and the broken alloy powder of hydrogen is taken off Hydrogen；
5) alloy powder after Dehydroepiandrosterone derivative is mixed with the powder of rare earths material containing Si obtained by step 2), and lubrication is added Agent, antioxidant；
6) powder mixed is ground using airflow milling, and oxygen is added to reduce particle surface during airflow milling Activity；
7) powder after airflow milling is placed in batch mixer and is mixed, be placed in vertical orientation in magnetic field, die mould is at blank；
8) the good blank of die mould is placed in vacuum and is sintered, double tempering heat treatment is used after sintering, obtains neodymium iron boron magnetic body.
2. the preparation method of low-carbon Sintered NdFeB magnet according to claim 1, which is characterized in that in the step 4) Temperature when to broken alloy dehydrogenation is 500-550 DEG C, and dehydrogenation time is 3.0-3.5 hours.
3. the preparation method of low-carbon Sintered NdFeB magnet according to claim 1, which is characterized in that in the step 5) The addition of lubricant is the 0.05%-0.1% of all raw material alloy powder total weights, and the addition of antioxidant is all originals Expect the 0-0.5% of alloy powder total weight.
4. the preparation method of low-carbon Sintered NdFeB magnet according to claim 1, which is characterized in that will be mixed in step 6) When the powder got togather is ground using airflow milling, the granularity after grinding is 2-8 μm, and a concentration of 10-80ppm of oxygen is added.
5. the preparation method of low-carbon Sintered NdFeB magnet according to claim 1, which is characterized in that batch mixing in step 7) Time is 60-80min, alignment magnetic field 1.5-2.0T.
6. the preparation method of low-carbon Sintered NdFeB magnet according to claim 1, which is characterized in that will pressure in step 8) When the good blank of type is sintered, the temperature of sintering is 1020-1150 DEG C, and sintering time is 5.0-6.5 hours, and secondary returning is burning hot Processing is specially：Air quenching is to room temperature after keeping the temperature 3-4 hours at 850-900 DEG C, then after being warming up to 460-540 DEG C of heat preservation 3-4 hours Air quenching is to room temperature.
7. the preparation method of low-carbon Sintered NdFeB magnet according to any one of claim 1 to 6, which is characterized in that The mass percent of the Nd Fe B alloys ingredient is ((PrNd)1-mREm)aFebMcBd, wherein RE is thulium, M For Al, Co, Si, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, Hf, Ta, W, Pt, Au, Pb and It is one or more in Bi, and the 0 ＜ ＜ of m≤0.1,28≤a≤33,0 c≤7,0 ＜ d≤1.5, b=100-a-c-d.
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CN104227004A (en) * 2014-09-12 2014-12-24 沈阳中北真空技术有限公司 Jet-milling powder production facility without bed charge, jet-milling powder production method without bed charge and manufacturing method for permanent magnets
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Publication number Priority date Publication date Assignee Title
CN101958171A (en) * 2010-04-14 2011-01-26 无锡南理工科技发展有限公司 Method for preparing corrosion-resistant sintered neodymium iron boron (NdFeB) magnet
CN102982938A (en) * 2012-11-19 2013-03-20 宁波科星材料科技有限公司 Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof
CN103426624A (en) * 2013-08-14 2013-12-04 林建强 Production method for neodymium-iron-boron permanent magnet
CN104227004A (en) * 2014-09-12 2014-12-24 沈阳中北真空技术有限公司 Jet-milling powder production facility without bed charge, jet-milling powder production method without bed charge and manufacturing method for permanent magnets
CN104347216A (en) * 2014-10-13 2015-02-11 宁波同创强磁材料有限公司 Lanthanide-compounded NdFeB magnetic material and preparation method thereof

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