CN107424699A - Superelevation remanent magnetism neodymium iron boron magnetic body and preparation method thereof - Google Patents
Superelevation remanent magnetism neodymium iron boron magnetic body and preparation method thereof Download PDFInfo
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- CN107424699A CN107424699A CN201710692285.3A CN201710692285A CN107424699A CN 107424699 A CN107424699 A CN 107424699A CN 201710692285 A CN201710692285 A CN 201710692285A CN 107424699 A CN107424699 A CN 107424699A
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- superelevation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
-
- 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
-
- 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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
-
- 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
Abstract
The invention discloses a kind of superelevation remanent magnetism neodymium iron boron magnetic body, it is prepared from the following components, and the component includes：Pure Nd 30wt%, Cu 0.06wt%, Co 0.65wt%, B 0.94wt%, Ga 0.2wt%, remaining is Fe.Present invention also offers the preparation method of the superelevation remanent magnetism neodymium iron boron magnetic body, and the component is made after alloy sheet and carries out the quick-fried processing of hydrogen, and wherein desorption temperature is 480 520 DEG C；After superelevation remanent magnetism neodymium iron boron magnetic body is obtained after powder processed, pressed compact and vacuum-sintering.The preparation method step is simple, easy to operate, can realize that batch production remanent magnetism reaches 14.4 14.8KGs, coercivity reaches 14 16KOe superelevation remanent magnetism neodymium iron boron magnetic body.
Description
Technical field
The present invention relates to a kind of neodymium-iron-boron preparation.A kind of it is more particularly related to superelevation remanent magnetism neodymium
Iron boron magnet and preparation method thereof.
Background technology
Sintered neodymium iron boron material has the title of " magnetic king " because of its high-residual magnetism high-coercive force.Remanent magnetism and coercivity are contradiction again
Body, a side raise the opposing party and must reduced, it is desirable to prepare superelevation remanent magnetism and the enough product of coercivity is difficult hardly possible.Sinter neodymium
The magnetic energy product theoretical value of iron boron can reach 64MGsOe, and a few experiments can reach 58MGsOe under the conditions of room.Therefore, superelevation remanent magnetism produces
The batch production of product is extremely difficult to.
The content of the invention
It is an object of the invention to solve at least the above, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of superelevation remanent magnetism neodymium iron boron magnetic body, and it uses new formula, Neng Goushi
Now batch production remanent magnetism reaches 14.4-14.8KGs, and coercivity reaches 14-16KOe superelevation remanent magnetism neodymium iron boron magnetic body.
It is a still further object of the present invention to provide a kind of preparation method of superelevation remanent magnetism neodymium iron boron magnetic body, and it can use spy
Different processing technology, produce superelevation remanent magnetism neodymium iron boron magnetic body in batches.
In order to realize according to object of the present invention and further advantage, there is provided a kind of superelevation remanent magnetism neodymium iron boron magnetic body,
It is prepared from the following components, and the component includes：Pure Nd 30wt%, Cu 0.06wt%, Co 0.65wt%, B
0.94wt%, Ga 0.2wt%, remaining is Fe.Wherein iron staff will derust, and rare earth material wants oil-free, amphidromic, rustless.
The present invention also provides a kind of preparation method of the superelevation remanent magnetism neodymium iron boron magnetic body, and it includes：By the component system
The quick-fried processing of hydrogen is carried out after into alloy sheet, wherein desorption temperature is 480-520 DEG C；After through powder processed, pressed compact and vacuum-sintering
After obtain superelevation remanent magnetism neodymium iron boron magnetic body.
Preferably, the alloy sheet is prepared by following methods：The component is carried out by intermediate frequency by vacuum melting
Sensing heating melts metal, then by the way that on the cooling by water roller of basket pouring to rotation, final acquisition sheet has post
The fast quenching Nd Fe B alloys thin slice of shape crystal structure, the column crystal ratio more than 95% of the alloy sheet, thickness 0.15-
0.40mm。
Preferably, the quick-fried processing of the hydrogen specifically includes：The alloy sheet is put into hydrogen broken furnace, is passed through hydrogen, it is raw
Into the Nd of large lattice constant2Fe14BHxAnd NdH3Make microscopic structure volumetric expansion, cause rejection tablet explosion into 30-300 μm of loose powder
End, until no longer inhaling hydrogen；The progress dehydrogenation heating of 480-520 DEG C of desorption temperature is set afterwards, body of heater rotational frequency in 25-30Hz,
Dehydrogenation time is in 4-8h；Come out of the stove to obtain the middle powder that surface uniformly coats property-modifying additive.
Preferably, the powder processed specifically includes：It is 3.75-3.9 μm to grind granularity with high pressure nitrogen by airflow milling
Powder.
Preferably, the pressed compact specifically includes：Mixing powder machine using V-type adds a little antioxidant and forming agent that powder is mixed
Close uniform, the mo(u)ldenpress orientation that magnetizes is pressed into density 3.9-4.3g/cm3Pressed compact, cold isostatic press further compresses pressed compact, close
Spend 4.4-4.6g/cm.
Preferably, the vacuum-sintering specifically includes：Green compact are loaded into vacuum sintering furnace, vacuum is evacuated to and arrives
Below 0.3Pa, 200 DEG C or so insulation draining gas are warming up to, are warming up to 500 DEG C or so insulation row's organic matters, are warming up to 800 DEG C of guarantors
Temperature row H2, i.e. 1020 DEG C of -1050 DEG C of temperature liquid-phase sinterings are warming up to below principal phase fusing point, are incubated 180-600min at a temperature of this,
Heater, applying argon gas to 85-100Kpa are closed, the machine that blows in is cooled to 60 DEG C -80 DEG C and come out of the stove, and obtains sintered magnet.
The present invention comprises at least following beneficial effect：Superelevation remanent magnetism neodymium iron boron magnetic body of the present invention is formulated using brand-new,
The formula rate special by designing each component so that superelevation remanent magnetism neodymium iron boron magnetic body can carry out batch, the neodymium produced
Iron boron magnet, remanent magnetism 14.4-14.8KGs, coercivity 14-16KOe, maximum magnetic energy product are up to 55-58MGsOe.The present invention
The preparation method of the superelevation remanent magnetism neodymium iron boron magnetic body, step is simple, by regulating and controlling the specification of alloy sheet, controls degassing temperature
And without oxygenation flouring technology, realize the batch production of superelevation remanent magnetism neodymium iron boron magnetic body.The preparation method step is simple, behaviour
Facilitate, and the product with stable quality produced.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Embodiment
With reference to embodiment, the present invention is described in further detail, to make those skilled in the art with reference to specification
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not precluded from one or more
The presence or addition of individual other elements or its combination.
The present invention provides a kind of superelevation remanent magnetism neodymium iron boron magnetic body, and it has following components to be prepared：The component includes：It is pure
Nd 30wt%, Cu 0.06wt%, Co 0.65wt%, B 0.94wt%, Ga 0.2wt%, remaining is Fe.Wherein iron staff will remove
Rust, rare earth material want oil-free, amphidromic, rustless.
The preparation method of superelevation remanent magnetism neodymium iron boron magnetic body of the present invention, comprises the following steps：
(1) raw material are prepared：According to each component of recipe configuration；
(2) the raw material Frequency Induction Heating fusing metal that will be prepared by vacuum melting (SC), then passes through tundish
It is poured on the cooling by water roller of rotation, the final fast quenching Nd Fe B alloys with columnar crystal structure for obtaining sheet, rejection tablet post
Shape crystalline substance ratio more than 95%, thickness 0.15-0.40mm.
(3) alloy sheet after qualified is put into hydrogen broken furnace, is passed through hydrogen, and hydrogen can occur strong with rich neodymium phase and principal phase
Hydrogen abstraction reaction, generate the Nd of large lattice constant2Fe14BHxAnd NdH3Make microscopic structure volumetric expansion, cause rejection tablet explosion into 30-
300 μm of loose powder, until no longer inhaling hydrogen (inhaling hydrogen saturation, broken to finish)；Close heating mantles and desorption temperature 480- is set
520 DEG C of dehydrogenations heating, body of heater rotational frequency is in 25-30Hz, and dehydrogenation time is in 4-8h；Come out of the stove to obtain surface and uniformly coat to be modified to add
Add the middle powder of agent.Wherein, the degassing temperature must be strict controlled under lower temperature, otherwise dehydrogenation if temperature rise
Not thoroughly, magnet combination property can be influenceed.
(4) middle powder addition airflow milling is ground into the micron-sized powder of epigranular with high pressure nitrogen, pulverizing process is not
Oxygenation, the powder size X50 are 3.75-3.9 μm；V-type mixes powder machine and adds a little antioxidant such as JC1 that powder is well mixed,
The mo(u)ldenpress orientation that magnetizes is pressed into density 3.9-4.3g/cm3Pressed compact, cold isostatic press further compresses pressed compact, density 4.4-
4.6g/cm3。
(5) green compact are loaded into vacuum sintering furnace, is evacuated to vacuum to below 0.3Pa, is warming up to 200 DEG C or so insulations
Draining gas, 500 DEG C or so insulation row's organic matters are warming up to, are warming up to 800 DEG C of insulation row H2, it is warming up to below principal phase fusing point i.e.
1020 DEG C of -1050 DEG C of temperature liquid-phase sinterings, 180-600min is incubated at a temperature of this, closes heater, applying argon gas to 85-
100Kpa, the machine that blows in are cooled to 60 DEG C -80 DEG C and come out of the stove, and obtain sintered magnet.
Embodiment 1
The preparation method of superelevation remanent magnetism neodymium iron boron magnetic body of the present invention, comprises the following steps：
(1) raw material are prepared：According to each component of recipe configuration；
(2) the raw material Frequency Induction Heating fusing metal that will be prepared by vacuum melting (SC), then passes through tundish
It is poured on the cooling by water roller of rotation, the final fast quenching Nd Fe B alloys with columnar crystal structure for obtaining sheet, rejection tablet post
Shape crystalline substance ratio more than 95%, thickness 0.15mm.
(3) alloy sheet after qualified is put into hydrogen broken furnace, is passed through hydrogen, and hydrogen can occur strong with rich neodymium phase and principal phase
Hydrogen abstraction reaction, generate the Nd of large lattice constant2Fe14BHxAnd NdH3Make microscopic structure volumetric expansion, cause rejection tablet explosion into 100
μm loose powder, until no longer inhaling hydrogen (inhaling hydrogen saturation, broken to finish)；Closing heating mantles sets 480 DEG C of desorption temperature de-
Hydrogen heats, and body of heater rotational frequency is in 25Hz, and dehydrogenation time is in 4h；Come out of the stove to obtain the middle powder that surface uniformly coats property-modifying additive
Body.
(4) middle powder addition airflow milling is ground into the micron-sized powder of epigranular with high pressure nitrogen, pulverizing process is not
Oxygenation, the powder size X50 are 3.75 μm；V-type mixes powder machine and adds a little antioxidant such as JC1 that powder is well mixed, automatically
The press orientation that magnetizes is pressed into density 3.9g/cm3Pressed compact, cold isostatic press further compresses pressed compact, density 4.4g/cm3。
(5) green compact are loaded into vacuum sintering furnace, is evacuated to vacuum to below 0.3Pa, is warming up to 200 DEG C or so insulations
Draining gas, 500 DEG C or so insulation row's organic matters are warming up to, are warming up to 800 DEG C of insulation row H2, it is warming up to below principal phase fusing point i.e.
1020 DEG C of temperature liquid-phase sinterings, 180min is incubated at a temperature of this, closes heater, applying argon gas to 85-100Kpa, the machine that blows in cooling
Come out of the stove to 60 DEG C, obtain sintered magnet.
Embodiment 2
The preparation method of superelevation remanent magnetism neodymium iron boron magnetic body of the present invention, comprises the following steps：(1) raw material are prepared：Press
According to each component of recipe configuration；
(2) the raw material Frequency Induction Heating fusing metal that will be prepared by vacuum melting (SC), then passes through tundish
It is poured on the cooling by water roller of rotation, the final fast quenching Nd Fe B alloys with columnar crystal structure for obtaining sheet, rejection tablet post
Shape crystalline substance ratio more than 95%, thickness 0.40mm.
(3) alloy sheet after qualified is put into hydrogen broken furnace, is passed through hydrogen, and hydrogen can occur strong with rich neodymium phase and principal phase
Hydrogen abstraction reaction, generate the Nd of large lattice constant2Fe14BHxAnd NdH3Make microscopic structure volumetric expansion, cause rejection tablet explosion into 300
μm loose powder, until no longer inhaling hydrogen (inhaling hydrogen saturation, broken to finish)；Closing heating mantles sets 520 DEG C of desorption temperature de-
Hydrogen heats, and body of heater rotational frequency is in 30Hz, and dehydrogenation time is in 8h；Come out of the stove to obtain the middle powder that surface uniformly coats property-modifying additive
Body.
(4) middle powder addition airflow milling is ground into the micron-sized powder of epigranular with high pressure nitrogen, pulverizing process is not
Oxygenation, the powder size are 3.9 μm；V-type mixes powder machine and adds a little antioxidant such as JC1 that powder is well mixed, mo(u)ldenpress
The orientation that magnetizes is pressed into density 4.3g/cm3Pressed compact, cold isostatic press further compresses pressed compact, density 4.6g/cm3。
(5) green compact are loaded into vacuum sintering furnace, is evacuated to vacuum to below 0.3Pa, is warming up to 200 DEG C or so insulations
Draining gas, 500 DEG C or so insulation row's organic matters are warming up to, are warming up to 800 DEG C of insulation row H2, it is warming up to below principal phase fusing point i.e.
1050 DEG C of temperature liquid-phase sinterings, 600min is incubated at a temperature of this, closes heater, applying argon gas to 85-100Kpa, the machine that blows in cooling
Come out of the stove to 80 DEG C, obtain sintered magnet.
Comparative example 1
According to the formula of superelevation remanent magnetism neodymium iron boron magnetic body of the present invention, using conventional sintering process, neodymium-iron-boron is prepared
Body.
The magnet performance of neodymium iron boron magnetic body prepared by embodiment 1, embodiment 2 and comparative example 1 is detected, as a result see the table below
| Br/KGS | Hcj/KOe | (BH)Max/MGsOe | |
| Embodiment 1 | 14.4 | 14 | 55 |
| Embodiment 2 | 14.8 | 16 | 58 |
| Comparative example 1 | 13.6 | 11 | 46 |
, it is apparent that the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body of the present invention from upper table, using this hair
The bright formula, by the strict control of technological parameter in preparation process, it can not only produce superelevation remanent magnetism neodymium-iron-boron in batches
Body, while the superelevation remanent magnetism neodymium iron boron magnetic body stable performance of its production.Not only remanent magnetism is higher than common process, and coercivity is also high
In common process.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimited
In specific details and shown here as the embodiment with description.
Claims (7)
1. a kind of superelevation remanent magnetism neodymium iron boron magnetic body, it is characterised in that be prepared from the following components, the component includes：Pure Nd
30wt%, Cu 0.06wt%, Co 0.65wt%, B 0.94wt%, Ga 0.2wt%, remaining is Fe.
A kind of 2. preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 1, it is characterised in that including：By institute
State after alloy sheet is made in component and carry out the quick-fried processing of hydrogen, wherein desorption temperature is 480-520 DEG C；After through powder processed, pressed compact and
Superelevation remanent magnetism neodymium iron boron magnetic body is obtained after vacuum-sintering.
3. the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 2, it is characterised in that the alloy sheet leads to
Following methods are crossed to prepare：The component is carried out by Frequency Induction Heating fusing metal by vacuum melting, then passes through tundish
It is poured on the cooling by water roller of rotation, the final fast quenching Nd Fe B alloys thin slice with columnar crystal structure for obtaining sheet, institute
State the column crystal ratio more than 95% of alloy sheet, thickness 0.15-0.40mm.
4. the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 2, it is characterised in that the quick-fried processing tool of hydrogen
Body includes：The alloy sheet is put into hydrogen broken furnace, is passed through hydrogen, generates the Nd of large lattice constant2Fe14BHxAnd NdH3Make to show
Micro-assembly robot volumetric expansion, rejection tablet explosion is caused into 30-300 μm of loose powder, until no longer inhaling hydrogen；Desorption temperature is set afterwards
480-520 DEG C of progress dehydrogenation heating, body of heater rotational frequency is in 25-30Hz, and dehydrogenation time is in 4-8h；Come out of the stove to obtain surface and uniformly apply
Cover the middle powder of property-modifying additive.
5. the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 2, it is characterised in that the powder processed specifically wraps
Include：The powder that granularity is 3.75-3.9 μm is ground with high pressure nitrogen by airflow milling.
6. the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 5, it is characterised in that the pressed compact specifically wraps
Include：Mixing powder machine using V-type adds a little antioxidant and forming agent that powder is well mixed, and the mo(u)ldenpress orientation that magnetizes is pressed into density
3.9-4.3g/cm3Pressed compact, cold isostatic press further compresses pressed compact, density 4.4-4.6g/cm.
7. the preparation method of superelevation remanent magnetism neodymium iron boron magnetic body as claimed in claim 2, it is characterised in that the vacuum-sintering tool
Body includes：Green compact are loaded into vacuum sintering furnace, vacuum is evacuated to below 0.3Pa, is warming up to 200 DEG C or so insulation drainings
Gas, 500 DEG C or so insulation row's organic matters are warming up to, are warming up to 800 DEG C of insulation row H2, it is warming up to i.e. 1020 below principal phase fusing point
DEG C -1050 DEG C of temperature liquid-phase sinterings, 180-600min is incubated at a temperature of this, heater is closed, applying argon gas to 85-100Kpa, opens
Blower fan is cooled to 60 DEG C -80 DEG C and come out of the stove, and obtains sintered magnet.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334417A (en) * | 2021-12-28 | 2022-04-12 | 湖南稀土新能源材料有限责任公司 | Preparation method of sintered neodymium-iron-boron magnet |
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| CN104575897A (en) * | 2014-12-04 | 2015-04-29 | 浙江东阳东磁有限公司 | High-performance rare-earth permanent magnetic material and preparation method thereof |
| CN105513737A (en) * | 2016-01-21 | 2016-04-20 | 烟台首钢磁性材料股份有限公司 | Preparation method of sintered neodymium-iron-boron magnet without containing heavy rare earth elements |
| CN105869817A (en) * | 2016-05-05 | 2016-08-17 | 成都易胜科生物科技有限公司 | Lanthanide rare earth permanent magnetic powder and manufacturing method thereof |
Cited By (1)
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| CN114334417A (en) * | 2021-12-28 | 2022-04-12 | 湖南稀土新能源材料有限责任公司 | Preparation method of sintered neodymium-iron-boron magnet |
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Application publication date: 20171201 |