CN108597708A - A kind of high performance sintered neodymium-iron-boron and manufacturing method - Google Patents
A kind of high performance sintered neodymium-iron-boron and manufacturing method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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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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- 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
- H01F41/0273—Imparting anisotropy
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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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
Abstract
Can be made Br >=13.8kGs, Hcj >=22kOe the invention discloses a kind of high performance sintered neodymium-iron-boron manufacturing method, the neodymium iron boron of (BH) m >=46MGOe, and in neodymium iron boron heavy rare earth content<2%, reduce the price of product；A kind of high performance sintered neodymium-iron-boron, including bulk alloy, addition element and the impurity element that ingredient is R Fe B, wherein R is rare earth element, its weight percent is 0.8~1.1wt%, the addition element is Al, Cu, Zn, Co, In, Si, P, S, Ti, V, Cr, one or more of Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, W, its weight percent is 1~4wt%, the weight percent of Fe is 60~70wt%, and the weight percent of B is 0.8~1.1wt%.
Description
Technical field
The present invention relates to field of magnetic material, more specifically to a kind of high performance sintered neodymium-iron-boron and manufacturing method.
Background technology
For Nd-Fe-B systems sintered permanent magnet because of its excellent magnetic characteristic, purposes is increasingly wider.In recent years, along with setting
Standby lightweight, miniaturization, high performance and energy-saving needs magnet to have heat resistance, the resistance to coercivity one for moving back magnetism index
More than fixed, the index magnetic flux density of magnetic force size is high as far as possible.
The magnetic flux density increase of Nd-Fe-B systems sintered permanent magnet is to pass through Nd2Fe14The increase and crystallization of B volume fractions take
It is improved to the increase of degree；About coercitive increase, there are the methods of crystal grain refinement, the most commonly used is with heavy rare earth Dy,
Tb partial alternatives Nd2Fe14Nd in B improves Nd with this2Fe14The anisotropy field of B, coercivity are increased；On the other hand
The replacement of Dy, Tb can make Nd2Fe14The saturated pole strength reduction of B, therefore coercitive increase is only realized in aforementioned manners,
Magnetic flux density inevitably declines, and since heavy rare earth Dy, Tb belong to expensive rare earth element, uses in formula, no
The evitable price for increasing product.
Invention content
The purpose of the present invention is in view of the deficienciess of the prior art, high-coercive force and high magnetic flux can be obtained by providing one kind
The Sintered NdFeB magnet and manufacturing method of density.
To achieve the above object, the present invention provides a kind of high performance sintered neodymium-iron-borons, including the master that ingredient is R-Fe-B
Body alloy, addition element and impurity element, it is characterised in that：The addition element is dispersed in the bulk alloy,
Middle R be rare earth element, weight percent be 0.8~1.1wt%, the addition element be Al, Cu, Zn, Co, In, Si, P, S,
Ti, V, Cr, one or more of Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, W, weight hundred
Divide than being 1~4wt%, the weight percent of Fe is 60~70wt%, and the weight percent of B is 0.8~1.1wt%, described miscellaneous
Prime element is O, C, N.
In a kind of high performance sintered neodymium-iron-boron as described above, wherein the R include Y, Sc, La, Ce, Pr, Nd, Sm,
It is one or more in Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu rare earth element.
In a kind of high performance sintered neodymium-iron-boron as described above, wherein based on described rare earth element preferred Nd, Pr.
In a kind of high performance sintered neodymium-iron-boron as described above, wherein the weight percent of the B is 0.9~
1.0wt%.
A kind of high performance sintered neodymium-iron-boron manufacturing method, includes the following steps：
S1, Pr, Nd, Fe, B and Tb and addition element are matched into synthesis bulk alloy under the protection of argon gas with predetermined ratio
Melting is carried out, Nd Fe B alloys slab is formed by cast after the completion of melting；
S2, the Nd Fe B alloys slab obtained in step S1 is subjected to preliminary break process by the way that hydrogen is broken, obtaining granularity is
The Nd Fe B alloys coarse powder of 0.05~3mm, then use airflow milling that Nd Fe B alloys coarse powder is ground to granularity as 3~5 μm；
S3, the Nd Fe B alloys fine powder obtained in step S2 is subjected to oriented moulding under the atmosphere of nitrogen protection；
S4, it being then sent in sintering furnace and carries out vacuum-sintering, sintering temperature is 900~1100 DEG C, when sintering a length of 4~
6h finally obtains the Sintered NdFeB magnet of high-coercive force and high magnetic flux density.
In a kind of high performance sintered neodymium-iron-boron manufacturing method as described above, wherein the weight of Pr and Nd in the step S1
Amount percentage is 29~30wt%, and the weight percent of Tb is 0~1wt%, and the weight percent of B is 0.9~0.95wt%, Fe
Weight percent be 65~70wt%, the weight percent of addition element is 1~2wt%.
In a kind of high performance sintered neodymium-iron-boron manufacturing method as described above, wherein the addition element is Al, Cu, Co,
Nb、Zr、Ga。
In a kind of high performance sintered neodymium-iron-boron manufacturing method as described above, wherein added during step S2 hydrogen is broken
The heavy rare earth metal Tb or other heavy rare earth alloys of grain boundary decision and as Nd Fe B alloys slab is crushed together, wherein Tb's
Weight percent is 0~1wt%.
In a kind of high performance sintered neodymium-iron-boron manufacturing method as described above, wherein if the sintering temperature in step S3 is low
In 900 DEG C, then progress two-stage timeliness is needed to be sintered, first order aging temp is 800~900 DEG C, and the time is 1~3h, the
Secondary aging temperature is 450~550 DEG C, and the time is 4~6h.
In a kind of high performance sintered neodymium-iron-boron manufacturing method as described above, wherein the granularity described in step S2 be with
On the basis of laser particle analyzer measures D50, orientation field >=1.8T in step S3 in oriented moulding.
Beneficial effects of the present invention are：The content of this high performance sintered neodymium-iron-boron heavy rare earth<2%, reduce product
Price；With high-coercive force and high magnetic flux density, specific performance is：Br≥13.8kGs,Hcj≥22kOe,(BH)m≥
46MGOe；
It is Nd to influence the most important factor of magnet coercivity2Fe14The epitaxial layer of B, because epitaxial layer is easy to form magnetic reversal
Farmland is added heavy rare earth alloy, compound etc. by crystal boundary, is diffused in sintering process, in Nd2Fe14The epitaxial layer of B forms one
The shell structurre of layer heavy rare earth, substantially increases the anisotropy field of epitaxial layer, to improve coercivity, simultaneously because weight is dilute
Soil does not enter Nd2Fe14The inside of B, does not reduce Nd2Fe14The saturated pole intensity of B, thus magnetic flux density does not reduce.Pass through
The Nd-Fe-B systems sintered permanent magnet of the high remanent magnetism of high-coercive force may be implemented in this method, and the dosage of heavy rare earth Dy, Tb also obtain greatly
Big reduction.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the implementation of the present invention
Example, is clearly and completely described the technical solution of the embodiment of the present invention.Obviously, described embodiment is of the invention
A part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment 1
A kind of high performance sintered neodymium-iron-boron that embodiment 1 is provided includes bulk alloy, addition member of the ingredient for R-Fe-B
Element, the addition element are dispersed in the bulk alloy, wherein R be rare earth element, weight percent be 0.8~
1.1wt%, the addition element be Al, Cu, Zn, Co, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd,
One or more of Ag, Cd, Sn, Sb, Hf, Ta, W, weight percent are 1~4wt%, and the weight percent of Fe is 60
The weight percent of~70wt%, B are 0.8~1.1wt%, preferably 0.9~1.0wt%, and rest part O, C, N can not be kept away
The impurity element exempted from.
In the present embodiment, the R includes Y, Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu rare earth
It is one or more in element, preferably based on Nd, Pr.
Embodiment 2
A kind of high performance sintered neodymium-iron-boron manufacturing method that embodiment 2 is provided, includes the following steps：
1, melting：By Pr, Nd, Fe, B and Tb and addition element with predetermined ratio：The weight percent of Pr and Nd is 29
The weight percent of~30wt%, Tb are 0~1wt%, and the weight percent of B is 0.9~0.95wt%, the weight percent of Fe
For 65~70wt%, the addition element is Al, Cu, Co, Nb, Zr, Ga, and weight percent is 1~2wt%, according to above-mentioned
Proportioning forms bulk alloy, and melting is then carried out under the protection of argon gas, Nd Fe B alloys are formed by cast after the completion of melting
Slab；
2, hydrogen is broken：By the Nd Fe B alloys slab obtained in step 1 1Mpa hydrogen depress inhale hydrogen 3-4h, then 550 DEG C-
Dehydrogenase 35-6h at a temperature of 560 DEG C, completes preliminary break process, obtains the Nd Fe B alloys coarse powder that granularity is 0.05~3mm, institute
The granularity stated is on the basis of laser particle analyzer measures D50；
3, airflow milling：The antioxidant of 0.04wt% is added in Nd Fe B alloys coarse powder, and is uniformly mixed, and air-flow is passed through
It grinds and Nd Fe B alloys coarse powder is ground to the fine powder that granularity is 3~5 μm, the granularity is measured with laser particle analyzer
On the basis of D50；
4, it is molded：By the Nd Fe B alloys fine powder obtained in step 3 under the atmosphere of nitrogen protection be orientated field >=
It is pressed in the magnetic field of 1.8T, and 120s is kept by 250Mpa static pressure, obtain blank；
5, it is sintered：The blank obtained in step 4 to be sent to carrying out vacuum-sintering in sintering furnace, sintering temperature is 900~
1100 DEG C, when sintering a length of 4~6h, finally obtain the Sintered NdFeB magnet of high-coercive force and high magnetic flux density.
In the present embodiment, the heavy rare earth metal Tb of addition grain boundary decision or other heavy rare earth close during step 2 hydrogen is broken
Gold and as Nd Fe B alloys slab is crushed together, wherein the weight percent of Tb be 0~1wt%.
In the present embodiment, if the sintering temperature in step 5 is less than 900 DEG C, progress two-stage timeliness is needed to be sintered, the
Level-one aging temp is 800~900 DEG C, and the time is 1~3h, and second level aging temp is 450~550 DEG C, and the time is 4~6h.
By the above method, there is high-coercive force and high magnetic flux density, specific performance to be for obtained sintered NdFeB：Br≥
13.8kGs,Hcj≥22kOe,(BH)m≥46MGOe。
Embodiment 3
A kind of high performance sintered neodymium-iron-boron manufacturing method that embodiment 3 is provided, includes the following steps：
1, melting：By Pr, Nd, Fe, B and Tb and addition element with predetermined ratio：The weight percent of Pr and Nd is 29
The weight percent of~30wt%, Tb are 0~1wt%, and the weight percent of B is 0.9~0.95wt%, the weight percent of Fe
For 65~70wt%, the addition element is Al, Cu, Co, Nb, Zr, Ga, and weight percent is 1~2wt%, according to above-mentioned
Proportioning forms bulk alloy, and melting is then carried out under the protection of argon gas, Nd Fe B alloys are formed by cast after the completion of melting
Slab, obtained Nd Fe B alloys slab thickness are 0.1~0.4mm；
2, hydrogen is broken：The Nd Fe B alloys slab obtained in step 1 is depressed in 1Mpa hydrogen and inhales hydrogen 3h, then in 560 DEG C of temperature
The lower dehydrogenase 35 h of degree, completes preliminary break process, obtains the Nd Fe B alloys coarse powder that granularity is 2mm, the granularity is with laser
On the basis of particle size instrument D50；
3, airflow milling：The antioxidant of 0.04wt% is added in Nd Fe B alloys coarse powder, and is uniformly mixed, and air-flow is passed through
It grinds and Nd Fe B alloys coarse powder is ground to the fine powder that granularity is 4 μm, the granularity is to measure D50 with laser particle analyzer to be
Benchmark；
4, it is molded：By the Nd Fe B alloys fine powder obtained in step 3 under the atmosphere of nitrogen protection be orientated field >=
It is pressed in the magnetic field of 1.8T, and 120s is kept by 250Mpa static pressure, obtain blank；
5, it is sintered：The blank obtained in step 4 to be sent to vacuum-sintering is carried out in sintering furnace, sintering temperature is 1050 DEG C,
A length of 6h when sintering, finally obtains the Sintered NdFeB magnet of high-coercive force and high magnetic flux density.
In the present embodiment, if the sintering temperature in step 5 is less than 900 DEG C, progress two-stage timeliness is needed to be sintered, the
Level-one aging temp is 850 DEG C, time 2h, and second level aging temp is 500 DEG C, time 6h.
It is Nd due to influencing the most important factor of magnet coercivity2Fe14The epitaxial layer of B, but epitaxial layer is easy to be formed instead
Magnetized domains are added heavy rare earth alloy, compound etc. by crystal boundary, are diffused in sintering process, in Nd2Fe14The epitaxial layer shape of B
At the shell structurre of one layer of heavy rare earth, the anisotropy field of epitaxial layer is substantially increased, to improve coercivity, simultaneously because
Heavy rare earth does not enter Nd2Fe14The inside of B, does not reduce Nd2Fe14The saturated pole intensity of B, thus magnetic flux density does not reduce.
The Nd-Fe-B systems sintered permanent magnet of the high remanent magnetism of high-coercive force may be implemented by this method, the dosage of heavy rare earth Dy, Tb also obtain
To greatly reducing.
To sum up, Br >=13.8kGs, Hcj >=22kOe can be obtained according to above-mentioned technical solution, (BH) m >=
The sintered NdFeB of 46MGOe, and the content of heavy rare earth therein<2%, greatly reduce the price of product.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (10)
1. a kind of high performance sintered neodymium-iron-boron, including ingredient are bulk alloy, addition element and the impurity element of R-Fe-B, spy
Sign is：The addition element is dispersed in the bulk alloy, and wherein R is rare earth element, weight percent 0.8
~1.1wt%, the addition element be Al, Cu, Zn, Co, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo,
One or more of Pd, Ag, Cd, Sn, Sb, Hf, Ta, W, weight percent are 1~4wt%, the weight percent of Fe
Weight percent for 60~70wt%, B is 0.8~1.1wt%, and the impurity element is O, C, N.
2. a kind of high performance sintered neodymium-iron-boron according to claim 1, it is characterised in that：The R include Y, Sc, La, Ce,
It is one or more in Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu rare earth element.
3. a kind of high performance sintered neodymium-iron-boron according to claim 2, it is characterised in that：The preferred Nd of the rare earth element,
Based on Pr.
4. a kind of high performance sintered neodymium-iron-boron according to claim 1, it is characterised in that：The weight percent of the B is
0.9~1.0wt%.
5. a kind of high performance sintered neodymium-iron-boron manufacturing method, includes the following steps：
S1, Pr, Nd, Fe, B and Tb and addition element are carried out with synthesis bulk alloy under the protection of argon gas with predetermined ratio
Melting forms Nd Fe B alloys slab after the completion of melting by cast；
S2, the Nd Fe B alloys slab obtained in step S1 is subjected to preliminary break process by the way that hydrogen is broken, it is 0.05 to obtain granularity
The Nd Fe B alloys coarse powder of~3mm, then use airflow milling that Nd Fe B alloys coarse powder is ground to granularity as 3~5 μm；
S3, the Nd Fe B alloys fine powder obtained in step S2 is subjected to oriented moulding under the atmosphere of nitrogen protection；
S4, be then sent in sintering furnace and carry out vacuum-sintering, sintering temperature is 900~1100 DEG C, when sintering a length of 4~6h, most
The Sintered NdFeB magnet of high-coercive force and high magnetic flux density is obtained eventually.
6. a kind of high performance sintered neodymium-iron-boron manufacturing method according to claim 5, it is characterised in that：In the step S1
The weight percent of Pr and Nd is 29~30wt%, and the weight percent of Tb is 0~1wt%, the weight percent of B is 0.9~
The weight percent of 0.95wt%, Fe are 65~70wt%, and the weight percent of addition element is 1~2wt%.
7. a kind of high performance sintered neodymium-iron-boron manufacturing method according to claim 6, it is characterised in that：The addition element
For Al, Cu, Co, Nb, Zr, Ga.
8. a kind of high performance sintered neodymium-iron-boron manufacturing method according to claim 5, it is characterised in that：It is broken in step S2 hydrogen
The heavy rare earth metal Tb or other heavy rare earth alloys and as Nd Fe B alloys slab is broken together of addition grain boundary decision in the process
Broken, wherein the weight percent of Tb is 0~1wt%.
9. a kind of high performance sintered neodymium-iron-boron manufacturing method according to claim 5, it is characterised in that：If in step S3
Sintering temperature is less than 900 DEG C, then progress two-stage timeliness is needed to be sintered, and first order aging temp is 800~900 DEG C, the time
For 1~3h, second level aging temp is 450~550 DEG C, and the time is 4~6h.
10. a kind of high performance sintered neodymium-iron-boron manufacturing method according to claim 5, it is characterised in that：Institute in step S2
The granularity stated is orientation field >=1.8T in step S3 in oriented moulding on the basis of laser particle analyzer measures D50.
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| CN109627916A (en) * | 2018-12-18 | 2019-04-16 | 浙江中杭新材料科技有限公司 | A kind of preparation method of Sintered NdFeB magnet |
| CN110148506A (en) * | 2019-04-03 | 2019-08-20 | 宁波同创强磁材料有限公司 | Widen the method for rare-earth permanent magnet sintering temperature window and the preparation method of rare-earth permanent magnet |
| CN110148508A (en) * | 2019-04-28 | 2019-08-20 | 深圳市吉胜华力科技有限公司 | A kind of rare earth permanent-magnetic material |
| WO2021135142A1 (en) * | 2019-12-31 | 2021-07-08 | 厦门钨业股份有限公司 | R-t-b series permanent magnet material, raw material composition, preparation method and application |
| CN113782289A (en) * | 2021-08-03 | 2021-12-10 | 宁波可可磁业股份有限公司 | Low (no) heavy rare earth high-coercivity sintered neodymium-iron-boron magnet and preparation method thereof |
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| WO2021135142A1 (en) * | 2019-12-31 | 2021-07-08 | 厦门钨业股份有限公司 | R-t-b series permanent magnet material, raw material composition, preparation method and application |
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