CN105405565B - A kind of magnetic material and preparation method - Google Patents
A kind of magnetic material and preparation method Download PDFInfo
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- CN105405565B CN105405565B CN201510963577.7A CN201510963577A CN105405565B CN 105405565 B CN105405565 B CN 105405565B CN 201510963577 A CN201510963577 A CN 201510963577A CN 105405565 B CN105405565 B CN 105405565B
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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
- H01F1/058—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IVa elements, e.g. Gd2Fe14C
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—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 in the form of particles, e.g. powder
- H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
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- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a kind of magnetic material and preparation method.The material of the present invention has uniform tissue, is good for strong structure, can both improve the anti-corrosion capability of material, and magnetic property makes moderate progress.Material of the present invention has good stability and practicality, can be widely applied to the every field such as electronic device, aeronautical and space technology, computer equipment, magnetic separator, communication apparatus, Medical Devices, electric bicycle, electronic toy.The preparation method of the permanent-magnet material of the present invention takes full advantage of waste material directly as alloy raw material, and composition proportion is flexible, and quality control is in place, and cost can be reduced, technique is simple, fully utilizes hyperoxic powder scrap, environmental protection, is effectively improved environment, has very high social value.
Description
Technical field
The invention belongs to metal material field, and in particular to a kind of magnetic material and preparation method.
Background technology
Usually said magnetic material refers to ferromagnetic substance, is functional material ancient and that purposes is quite varied, and thing
The magnetic of matter was just recognized and applied by people before 3000, such as ancient Chinese is used as compass by the use of native magnet.
Modem magnetic materials have been widely used among our life, such as permanent-magnet material is used as into motor, applied to transformer
In core material, the magneto-optic disk used as memory, computer magnetic recording floppy disk etc..Said in big bit information, magnetic
Material is closely related with informationization, automation, electromechanical integration, national defence, the every aspect of national economy.And generally, it is considered that magnetic
Property material refers to the material that magnetic can be directly or indirectly produced by transition element iron, cobalt, nickel and its alloy etc..Magnetic material is pressed
The difficulty or ease of degaussing can be divided into soft magnetic material and retentive material after magnetization.Easily remove the material of magnetic after magnetization soft magnetism
Material, it is not easy to which the material of degaussing is retentive material.Soft magnetic material remanent magnetism is smaller in general, retentive material remanent magnetism compared with
Greatly.
Chinese patent CN201410725480.8 discloses a kind of rare earth permanent-magnetic material and preparation method thereof.The preparation method
Comprise the following steps：Re-Fe-B quenched powders and Ce base quenched powders are provided respectively, wherein the Re-Fe-B quenched powders middle rare earth
Re is the one or more in Nd, Pr, Dy, Tb, and the Ce bases quenched powder is well mixed to obtain with the Re-Fe-B quenched powders
Magnetic is mixed, wherein, the mass percent described in the mixing magnetic shared by Ce base quenched powders is 10-50%；By described in
Mixing magnetic carries out hot-forming, thermoforming and temper successively, obtains rare earth permanent-magnetic material, rare earth permanent-magnetic material is
More principal phase structures, it is mainly made up of nano-grade crystalline substance.But material coercivity prepared by this method is high not enough.
Coercivity refers to magnetic material after saturated magnetization, and when external magnetic field returns to zero, its magnetic induction density B is not moved back
To zero, only can just magnetic induction intensity be set to return to zero plus a certain size magnetic field in former magnetizing field opposite direction, the magnetic field
Referred to as coercive field, also known as coercivity HC.On the demagnetizing curve of permanent-magnet material, when opposing magnetic field increases to a certain value HC,
The magnetic induction density B of magnet is 0, and the opposing magnetic field is referred to as the coercivity HC of the material；When in opposing magnetic field being HC, magnet is external
Magnetic flux is not shown, therefore coercivity HC characterizes the ability of the outside opposing magnetic field of permanent-magnet material resistance or other demagnetization effects.HC is
One of Important Parameters in magnetic Circuit Design.
The content of the invention
The purpose of the present invention is aiming at above-mentioned technological deficiency, there is provided a kind of magnetic material, the magnetic material have high
Coercivity.
It is a further object of the present invention to provide a kind of preparation method of magnetic material, and the preparation method technique is simple, production
Cost is low, suitable for industrialized production.
The purpose of the present invention is achieved through the following technical solutions：
A kind of magnetic material, the magnetic material are to be prepared by the following method to form：
1) first fluorescent powder scrap and permanent magnet waste material are placed in roaster at 500-650 DEG C and pre-processed；Grind again, will
Waste material and Na after milled processed2CO3Mixing, is calcined under the conditions of 680-810 DEG C；Then add into gained reaction product
Enter hydrochloric acid；The mixed liquor matched somebody with somebody is put into 70-80 DEG C of constant temperature water bath and heats 2-3h, is filtered afterwards, is contained
The leachate of rare earth element；Precipitation compounds after oxalic acid solution is mixed with leachate, the compound of precipitation is washed with water, received
Collect sediment drying, it is stand-by；
2) by sediment, it is incubated at a temperature of 1100-1170 DEG C, the mixed rare-earth oxide mill precipitated after cooling
It is standby carefully to 100-80 mesh；
3) and then the mixed rare-earth oxide of precipitation is put into electric furnace and smelted at 1050 DEG C；Come out of the stove pour into mould into
Rare earth alloy ingot；
4) rare earth alloy ingot is placed in vacuum electric furnace, furnace charge is Nd23-35%, Pr0.01- according to mass fraction
0.15%th, Gd0.01-0.15%, Tb0.01-0.15%, Si0.01-0.15%, Ni1-4%, Dy 1-4%, P 0.01-
0.15%th, B 1-5%, remaining Fe carry out dispensing；Fusion temperature is 1600-1630 DEG C, and pouring into ingot mould after being incubated 20-25 minutes obtains
Alloy pig；Then alloy pig is smashed and ground, obtain powder, powder is put into press die, suppressed under 2-3T pressure
Shaping, compacting base is placed in 1160-1190 DEG C of sintering furnace and sintered；Finally it is heat-treated at 200-350 DEG C, that is, obtains magnetic
Material.
Fluorescent powder scrap described in step 1) and permanent magnet waste material are placed in roaster small in 500-650 DEG C of pretreatment 1-2
When.
The weight of fluorescent powder scrap described in step 1) and permanent magnet waste material ratio is 1:1-2.
Na described in step 1)2CO3The fluorescent powder scrap mass ratio crossed with calcination process is 4: 1-1.5.
Oxalic acid solution dosage described in step 1) is the 35-45% of the quality of the waste material of calcination process.
The mixed rare-earth oxide precipitated described in step 3) is put into electric furnace the smelting 2-6 hours at 1050 DEG C.
Rare earth alloy ingot is placed in vacuum electric furnace described in step 4), and vacuum level requirements are less than 0.1Pa.
Alloy pig described in step 4) smashes and is put into the ball mill grinding 18-20 hours filled with nitrogen, obtains average grain
Spend the powder at 36 μm.
Compacting base described in step 4), which is placed in sintering furnace, to be sintered 36 hours, and sintering furnace vacuum level requirements are less than 0.1Pa
Heat treatment condition described in step 4) is to be heat-treated 2-6 hours under conditions of vacuum level requirements are less than 0.1Pa.
Beneficial effects of the present invention：
Compared with prior art, material of the invention has uniform tissue, is good for strong structure, can both improve the resistance to of material
Erosion ability, and magnetic property makes moderate progress.Material of the present invention has good stability and practicality, can be widely applied to electronics
Device, aeronautical and space technology, computer equipment, magnetic separator, communication apparatus, Medical Devices, electric bicycle, electronic toy etc. are each
Individual field.
The preparation method of the permanent-magnet material of the present invention takes full advantage of waste material directly as alloy raw material, composition proportion spirit
Living, quality control in place, and can reduce cost, and technique is simple, fully utilize hyperoxic powder scrap, environmentally friendly,
Environment is effectively improved, there is very high social value.
Brief description of the drawings
Fig. 1 is the organization chart of magnetic material of the present invention.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of magnetic material, the magnetic material are to be prepared by the following method to form：
1) first fluorescent powder scrap and permanent magnet waste material are placed in roaster in 500 DEG C of pretreatments；Fluorescent powder scrap and forever
The weight ratio of magnet waste material is 1:1.By the waste material and Na after milled processed2CO3Mixing, it is small that processing 2 is carried out under the conditions of 680 DEG C
When, wherein Na2CO3The fluorescent powder scrap mass ratio crossed with calcination process is 4: 1；Hydrochloric acid is added into gained reaction product, is reacted
The mass ratio of product and hydrochloric acid is 1：1；The mixed liquor matched somebody with somebody is put into 70 DEG C of constant temperature water baths and heats 2h, was carried out afterwards
Filter, obtains the leachate containing rare earth element；Precipitation compounds after 121g/L oxalic acid solution is mixed with leachate, oxalic acid are molten
Liquid dosage is the 35-45% of the quality of the waste material of calcination process, and 3-5 is washed with water after to the compound of precipitation, collects precipitation
120 DEG C of drying 1h of thing, it is stand-by to obtain sediment；
2) by sediment, 1 hour is incubated at a temperature of 1100 DEG C, the mixed rare-earth oxide mill precipitated after cooling
Carefully (100-80 mesh), it is standby；
3) and then the mixed rare-earth oxide of precipitation is put into electric furnace and smelted 2 hours at 1050 DEG C；Come out of the stove and pour into mould
Into rare earth alloy ingot in tool；
4) rare earth alloy ingot is placed in vacuum electric furnace, vacuum level requirements are less than 0.1Pa.Furnace charge is according to mass fraction
Nd23%, Pr0.01%, Gd0.01%, Tb0.01%, Si0.01%, Ni1%, Dy 1%, P 0.01%, B 1%, remaining Fe enter
Row dispensing.Fusion temperature is to pour into ingot mould after 1600-1630 DEG C of is incubated 20-25 minutes to obtain alloy pig.Then alloy pig is pounded
It is broken and be put into the ball mill grinding 18-20 hours filled with nitrogen, powder of the particle mean size at 36 μm is obtained, powder is put into press
It is compressing under 2T pressure in mould, compacting base is placed in 1160 DEG C of sintering furnace and sintered 36 hours, sintering furnace vacuum
It is required that it is less than 0.1Pa.Then it is heat-treated 2 hours, that is, obtains under conditions of finally 0.1Pa is less than in 200 DEG C, vacuum level requirements
Magnetic material.As seen from Figure 1, material structure dense uniform of the present invention.
Embodiment 2
A kind of magnetic material, the magnetic material are to be prepared by the following method to form：
1) first fluorescent powder scrap and permanent magnet waste material are placed in roaster in 650 DEG C of pretreatments；Fluorescent powder scrap and forever
The weight ratio of magnet waste material is 1:2.By the waste material and Na after milled processed2CO3Mixing, is handled under the conditions of 680-810 DEG C
4 hours, wherein Na2CO3The fluorescent powder scrap mass ratio crossed with calcination process is 4: 1-1.5；Salt is added into gained reaction product
The mass ratio of acid, reaction product and hydrochloric acid is 2：1；The mixed liquor matched somebody with somebody is put into 80 DEG C of constant temperature water baths and heats 3h, it
After filtered, obtain the leachate containing rare earth element；Chemical combination is separated out after 121g/L oxalic acid solution is mixed with leachate
Thing, oxalic acid solution dosage are the 45% of the quality of the waste material of calcination process, and 3-5 is washed with water after to the compound of precipitation, receives
Collect 120 DEG C of drying 1h of sediment, it is stand-by to obtain sediment；
2) by sediment, 2 hours are incubated at a temperature of 1170 DEG C, the mixed rare-earth oxide mill precipitated after cooling
Carefully (100-80 mesh), it is standby；
3) and then the mixed rare-earth oxide of precipitation is put into electric furnace and smelted 6 hours at 1050 DEG C；Come out of the stove and pour into mould
Into rare earth alloy ingot in tool；
4) rare earth alloy ingot is placed in vacuum electric furnace, vacuum level requirements are less than 0.1Pa.Furnace charge is according to mass fraction
Nd35%, Pr0.15%, Gd0.15%, Tb0.15%, Si0.15%, Ni4%, Dy4%, P 0.15%, B 5%, remaining Fe enter
Row dispensing.Fusion temperature is to pour into ingot mould after 1630 DEG C of are incubated 25 minutes to obtain alloy pig.Then alloy pig is smashed and is put into
Ball mill grinding filled with nitrogen 20 hours, particle mean size is obtained in 36 μm of powder, powder is put into press die, in 3T
It is compressing under pressure, compacting base is placed in 1190 DEG C of sintering furnace and sintered 36 hours, sintering furnace vacuum level requirements are less than
0.1Pa.Then it is heat-treated 6 hours under conditions of finally 0.1Pa is less than in 350 DEG C, vacuum level requirements, that is, obtains magnetic material
Material.
Embodiment 3
A kind of magnetic material, the magnetic material are to be prepared by the following method to form：
1) first fluorescent powder scrap and permanent magnet waste material are placed in roaster in 600 DEG C of pretreatments；Fluorescent powder scrap and forever
The weight ratio of magnet waste material is 1:2.By the waste material and Na after milled processed2CO3Mixing, it is small that processing 4 is carried out under the conditions of 800 DEG C
When, wherein Na2CO3The fluorescent powder scrap mass ratio crossed with calcination process is 4: 1.5；Hydrochloric acid is added into gained reaction product, instead
It is 2 to answer the mass ratio of product and hydrochloric acid：1；The mixed liquor matched somebody with somebody is put into 80 DEG C of constant temperature water baths and heats 3h, is carried out afterwards
Filtering, obtains the leachate containing rare earth element；Precipitation compounds after 121g/L oxalic acid solution is mixed with leachate, oxalic acid
Solution usage is the 45% of the quality of the waste material of calcination process, and 3-5 is washed with water after to the compound of precipitation, collects sediment
120 DEG C of drying 1h, it is stand-by to obtain sediment；
2) by sediment, 2 hours are incubated at a temperature of 1170 DEG C, the mixed rare-earth oxide mill precipitated after cooling
Carefully (100-80 mesh), it is standby；
3) and then the mixed rare-earth oxide of precipitation is put into electric furnace and smelted 6 hours at 1050 DEG C；Come out of the stove and pour into mould
Into rare earth alloy ingot in tool；
4) rare earth alloy ingot is placed in vacuum electric furnace, vacuum level requirements are less than 0.1Pa.Furnace charge is according to mass fraction
Nd28%, Pr0.09%, Gd0.08%, Tb0.08%, Si0.09%, Ni2%, Dy 3%, P 0.11%, B3%, remaining Fe enter
Row dispensing.Fusion temperature is to pour into ingot mould after 1620 DEG C of are incubated 25 minutes to obtain alloy pig.Then alloy pig is smashed and is put into
Ball mill grinding filled with nitrogen 20 hours, particle mean size is obtained in 36 μm of powder, powder is put into press die, in 3T
It is compressing under pressure, compacting base is placed in 1170 DEG C of sintering furnace and sintered 36 hours, sintering furnace vacuum level requirements are less than
0.1Pa.Then it is heat-treated 4 hours under conditions of finally 0.1Pa is less than in 300 DEG C, vacuum level requirements, that is, obtains magnetic material
Material.
Embodiment 4
Other conditions with embodiment 1, Nd21%, Pr0.005%, Gd0.003%, Tb0.006%, Si0.003%,
Ni0.4%, Dy0.5%, P 0.005%, B0.5%, remaining Fe carry out dispensing.
Embodiment 5
Other conditions with embodiment 1, Nd38%, Pr0.19%, Gd0.18%, Tb0.18%, Si0.2%, Ni1-4%,
Dy5%, P 021%, B 6%, remaining Fe carry out dispensing.
The magnetic material performance of the present invention see the table below：
As can be seen from the above table, material of the present invention increases with Nd, Pr, Gd, Tb, Si, Ni, Dy, P, B, and the performance of material is all
Improving.But the mutual restraint between element can be caused too much, have impact on the combination property of material on the contrary.
Claims (10)
1. a kind of magnetic material, it is characterised in that the magnetic material is to be prepared by the following method to form：
1）First fluorescent powder scrap and permanent magnet waste material are placed in roaster at 500-650 DEG C and pre-processed；Grind, will grind again
Waste material and Na after processing2CO3Mixing, is calcined under the conditions of 680-810 DEG C；Then salt is added into gained reaction product
Acid；The mixed liquor matched somebody with somebody is put into heating 2-3 h in 70-80 DEG C of constant temperature water bath, is filtered, is obtained containing dilute afterwards
The leachate of earth elements；Precipitation compounds after oxalic acid solution is mixed with leachate, the compound of precipitation is washed with water, received
Collect sediment drying, it is stand-by；
2）By sediment, it is incubated at a temperature of 1100-1170 DEG C, the mixed rare-earth oxide precipitated after cooling is levigate extremely
100-80 mesh, it is standby；
3）Then the mixed rare-earth oxide of precipitation is put into electric furnace and smelted at 1050 DEG C；Come out of the stove and pour into mould into dilute
Native alloy pig；
4）Rare earth alloy ingot is placed in vacuum electric furnace, furnace charge according to mass fraction be Nd23-35%, Pr0.01-0.15%,
It is Gd0.01-0.15%, Tb0.01-0.15%, Si0.01-0.15%, Ni1-4%, Dy 1-4%, P 0.01-0.15%, B 1- 5%, remaining
Fe carries out dispensing；Fusion temperature is 1600-1630 DEG C, and pouring into ingot mould after being incubated 20-25 minutes obtains alloy pig；Then by alloy
Ingot is smashed and ground, and obtains powder, and powder is put into press die, compressing under 2-3T pressure, and compacting base is placed in
Sintered in 1160-1190 DEG C of sintering furnace；Finally it is heat-treated at 200-350 DEG C, that is, obtains magnetic material.
2. magnetic material according to claim 1, it is characterised in that step 1）Described in fluorescent powder scrap and permanent magnet give up
Material is placed in roaster pre-processes 1-2 hours in 500-650 DEG C.
3. magnetic material according to claim 1, it is characterised in that step 1）Described in fluorescent powder scrap and permanent magnet give up
The weight ratio of material is 1:1-2.
4. magnetic material according to claim 1, it is characterised in that step 1）Described in Na2CO3Crossed with calcination process
Fluorescent powder scrap mass ratio is 4: 1-1.5.
5. magnetic material according to claim 1, it is characterised in that step 1）Described in oxalic acid solution dosage be roasting at
The 35-45% of the quality of the waste material of reason.
6. magnetic material according to claim 1, it is characterised in that step 3）Described in the mixed rare-earth oxide that precipitates
The smelting 2-6 hours at 1050 DEG C are put into electric furnace.
7. magnetic material according to claim 1, it is characterised in that step 4）Described in rare earth alloy ingot be placed in vacuum electric
In stove, vacuum level requirements are less than 0.1Pa.
8. magnetic material according to claim 1, it is characterised in that step 4）Described in alloy pig smash and be put into filled with
The ball mill grinding 18-20 hours of nitrogen, obtain powder of the particle mean size at 36 μm.
9. magnetic material according to claim 1, it is characterised in that step 4）Described in compacting base be placed in sintering furnace and burn
Knot 36 hours, sintering furnace vacuum level requirements are less than 0.1Pa.
10. magnetic material according to claim 1, it is characterised in that step 4）Described in heat treatment condition be vacuum
It is required that less than heat treatment 2-6 hours under conditions of 0.1Pa.
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|---|---|---|---|---|
| CN1065151A (en) * | 1991-01-31 | 1992-10-07 | 三菱材料株式会社 | Rare earth-iron-boron based anisotropy magnet |
| CN102220538A (en) * | 2011-05-17 | 2011-10-19 | 南京理工大学 | Sintered neodymium-iron-boron preparation method capable of improving intrinsic coercivity and anticorrosive performance |
| CN102956337A (en) * | 2012-11-09 | 2013-03-06 | 厦门钨业股份有限公司 | Process-saving manufacturing method of sintered Nd-Fe-B series magnet |
| CN103123840A (en) * | 2013-02-06 | 2013-05-29 | 山西三益强磁业有限公司 | Permanent magnet material with high pressure resisting intensity and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041360C (en) * | 1992-03-18 | 1998-12-23 | 冶金工业部包头稀土研究院 | Making method of temp.-compensation type permanent magnet |
| JP5274781B2 (en) * | 2007-03-22 | 2013-08-28 | 昭和電工株式会社 | R-T-B type alloy and method for producing R-T-B type alloy, fine powder for R-T-B type rare earth permanent magnet, R-T-B type rare earth permanent magnet |
| CN103077796B (en) * | 2013-02-06 | 2015-06-17 | 江苏南方永磁科技有限公司 | Corrosion-resistant neodymium-iron-boron permanent magnet material and preparation method thereof |
-
2015
- 2015-12-18 CN CN201510963577.7A patent/CN105405565B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065151A (en) * | 1991-01-31 | 1992-10-07 | 三菱材料株式会社 | Rare earth-iron-boron based anisotropy magnet |
| CN102220538A (en) * | 2011-05-17 | 2011-10-19 | 南京理工大学 | Sintered neodymium-iron-boron preparation method capable of improving intrinsic coercivity and anticorrosive performance |
| CN102956337A (en) * | 2012-11-09 | 2013-03-06 | 厦门钨业股份有限公司 | Process-saving manufacturing method of sintered Nd-Fe-B series magnet |
| CN103123840A (en) * | 2013-02-06 | 2013-05-29 | 山西三益强磁业有限公司 | Permanent magnet material with high pressure resisting intensity and preparation method thereof |
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Application publication date: 20160316 Assignee: Yisheng Global Co.,Ltd. Assignor: SUZHOU YUANGE ELECTRONIC Co.,Ltd. Contract record no.: X2023990000746 Denomination of invention: A magnetic material and its preparation method Granted publication date: 20180123 License type: Common License Record date: 20230810 |