CN108417336A - A kind of high intensity Nd-Fe-B permanent magnet material - Google Patents
A kind of high intensity Nd-Fe-B permanent magnet material Download PDFInfo
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- CN108417336A CN108417336A CN201810485208.5A CN201810485208A CN108417336A CN 108417336 A CN108417336 A CN 108417336A CN 201810485208 A CN201810485208 A CN 201810485208A CN 108417336 A CN108417336 A CN 108417336A
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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
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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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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Abstract
A kind of high intensity Nd-Fe-B permanent magnet material provided by the invention, the Nd-Fe-B permanent magnet material are grouped as by each group of following parts by weight：Graphene-supported nickel powder is 1 6%, and neodymium iron boron powder is 65 90%, and Zn Al alloyed powders are 6 15%.The grain size of the Zn Al alloyed powders is 100~500 μm.The granularity of the graphene-supported nickel by powder is 80 100 μm.High intensity Nd-Fe-B permanent magnet material preparation process of the present invention is simple, easy to operate, is suitable for large-scale batch production, and therefore, high intensity Nd-Fe-B permanent magnet material of the present invention is the high tough Sintered NdFeB magnet of high magnetic characteristics.
Description
Technical field
The present invention relates to technical field of permanent magnetic material preparation, refer in particular to a kind of high intensity Nd-Fe-B permanent magnet material.
Background technology
Sintered NdFeB magnet is as third generation rare earth permanent-magnetic material, with incomparable excellent of other permanent-magnet materials
Magnetic property and high cost performance.Therefore, since self-discovery, extensive research and swift and violent development have been obtained, computer,
The high-tech sectors such as communication electronics, automobile, aviation are used widely.With the continuous improvement of magnetic property, application range
Constantly expanding, the shortcomings that this also makes its poor mechanical property gradually highlights, and becomes limit that it further applies main and asks
Topic.Therefore, improving the mechanical property of Sintered NdFeB magnet becomes the important foundation for expanding its application range.
Sintered NdFeB magnet is a kind of fragile material, and tension, bending strength and fracture toughness are relatively low, this leads to it
Obdurability is poor.Obdurability official post Sintered NdFeB magnet is preparing and is being easy to happen cracking in process, falls side, arrisdefect
The problems such as, it influences it and prepares yield rate and machining accuracy.In addition, to also limit it higher in mechanical property requirements for obdurability difference
Application in occasion, such as aerospace, high-speed electric expreess locomotive field.Sintered NdFeB magnet obdurability difference and its main phase Nd2Fe14B
Crystal structure be closely related.Main phase is tetragonal structure, and slip system number is fewer, keeps its plastic deformation relatively more tired
It is difficult.In addition, the magnetocrystalline anisotropy of Sintered NdFeB magnet is also to lead to the major reason of its poor mechanical property, this is originating from each
Big internal stress caused by anisotropy.Studies have shown that the fracture mode of Sintered NdFeB magnet is mainly along brilliant brittle fracture,
This is caused by weak Grain-Boundary Phase.Therefore, Grain-Boundary Phase reduction is also the major reason of its obdurability difference.In recent years, people couple
Certain research has also been made in the mechanical property of Sintered NdFeB magnet.The method used at present is mainly microalloying method.Element
Microalloying is not only related with addition element to the improvement of magnet obdurability caused by addition, but also is influenced by magnet ingredient.
Sometimes intensity and toughness can improve simultaneously, but shifting trend is presented sometimes.People add cobalt member usually in magnet
Element, for improving the temperature stability of Nd Fe B alloys.However, the addition of cobalt is improving Curie temperature and is reducing reversible loss
Meanwhile also reduce the coercivity of magnet, for this reason, it may be necessary to addition improves coercitive alloying element into magnet, as Dy, Tb,
Nb, Ga and Al etc..And the addition of these alloying elements can cause the decline of remanent magnetism and magnetic energy product equimagnetic aspect of performance, and greatly
Cost is increased, its application is limited.Therefore, the suitable effective side for improving Sintered NdFeB magnet obdurability is not found so far
Method.
Its obdurability is improved it is necessary to enter from the reinforcing of crystal boundary under the premise of ensureing Sintered NdFeB magnet magnetic property
Hand, because this can effectively inhibit or be avoided the generation of grain boundary fracture.It is crystal boundary modified to be widely used in magnet magnetic property
Crystal boundary addition with the raising of corrosion resistance, wherein nano metal, Nano compound can be chemically reacted with Grain-Boundary Phase,
Achieve the purpose that modified Grain-Boundary Phase, to improve the magnetic property and corrosion resistance of magnet.
Invention content
Technical problem：The purpose of the present invention is to overcome the shortcomings of existing method, provide a kind of high intensity Nd-Fe-B permanent magnetic
Material improves the obdurability of magnet Grain-Boundary Phase, inhibits the generation of grain boundary fracture, improve the obdurability of magnet.
Technical solution：To achieve the above object, the present invention is achieved through the following technical solutions：
A kind of high intensity Nd-Fe-B permanent magnet material of the present invention, the Nd-Fe-B permanent magnet material are each by following parts by weight
Group is grouped as：
Graphene-supported nickel powder is 1-6%, and neodymium iron boron powder is 65-90%, and Zn-Al alloy powder is 6-15%.
Preferably, the granularity of the graphene-supported nickel by powder is 80-100 μm.
Preferably, the grain size of the Zn-Al alloy powder is 100~500 μm.
Preferably, Nd-Fe-B permanent magnet material is grouped as by each group of following parts by weight：Graphene-supported nickel powder is 1.5-
5.6%, neodymium iron boron powder is 70-85%, and Zn-Al alloy powder is 8-12%.
Preferably, Nd-Fe-B permanent magnet material is grouped as by each group of following parts by weight：Graphene-supported nickel powder is
3.2%, neodymium iron boron powder is 78%, and Zn-Al alloy powder is 9.5%.
Advantageous effect：Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention uses graphene-supported nickel for reinforcement, and graphene is made to be evenly distributed in neodymium iron boron matrix, and
So that graphene is fully effectively bonded with metal interface, is handled by mixing low temp diffusion technique, make sintered body surface in spongy
Fine through holes, for porosity communication rate up to 95% or more, maximum plays the characteristic of graphene, effectively improves the intensity of permanent-magnet material and leads
Hot property is sintered in addition, and graphene lubricant layer is formd around neodymium iron boron particles, further increases the wear-resisting of permanent-magnet material
Performance.Therefore, the present invention can significantly improve the obdurability of permanent-magnet material, realize high magnetic under the premise of keeping high magnetic characteristics
The matched well of performance and high-strength tenacity further expands its application range.It is prepared by high intensity Nd-Fe-B permanent magnet material of the present invention
Technical process is simple, easy to operate, is suitable for large-scale batch production, and therefore, high intensity Nd-Fe-B permanent magnet material of the present invention is height
The high tough Sintered NdFeB magnet of magnetic property.
(2) high intensity Nd-Fe-B permanent magnet material magnet consistency of the present invention is high, and Grain-Boundary Phase is evenly distributed, and enhances for nanometer
Composite construction, significantly improve the obdurability of Grain-Boundary Phase, it is suppressed that intergranular brittle fracture, and then improve sintered NdFeB magnetic
The obdurability of body has further expanded its practical application.
Specific implementation mode
The embodiment of the present invention addressed below.The elements and features described in one embodiment of the invention can be with
The elements and features shown in one or more other embodiments are combined.It should be noted that for purposes of clarity, saying
The expression and description of component unrelated to the invention, known to persons of ordinary skill in the art and processing are omitted in bright.
Embodiment 1：
A kind of high intensity Nd-Fe-B permanent magnet material of the present invention, the Nd-Fe-B permanent magnet material are each by following parts by weight
Group is grouped as：
Graphene-supported nickel powder is 1-6%, and neodymium iron boron powder is 65-90%, and Zn-Al alloy powder is 6-15%.
Its preparation method is as follows：
(1) Fe, Nd and B are mixed and is placed on intermediate frequency vacuum induction melting furnace and carries out melting, obtain neodymium iron boron, wherein Fe,
The mass ratio of Nd, B are 72: 26: 1；
(2) neodymium iron boron that step (1) obtains is processed as neodymium iron boron powder by airflow milling；
(3) neodymium iron boron powder obtained above, graphene-supported nickel by powder and Zn-Al alloy powder are put into ball mill
Ball mill mixing is carried out, and is added thereto and 0.1% oleic acid is added as dispersant, is then sufficiently mixed；Each component
Mass fraction matches：Graphene-supported nickel powder is 1%, and neodymium iron boron powder is 90%, and Zn-Al alloy powder is 6%；Graphene is negative
The granularity for carrying nickel by powder is 80 μm, and the grain size of Zn-Al alloy powder is 100 μm.
(4) by upper well-mixed powder in diffusion furnace by 230 DEG C, low temperature diffusion is carried out under the protection of N gas, is made
The advance alloying of part metals；
(5) mixture for obtaining step (4) oriented moulding and isostatic pressed in being orientated field, then burnt by vacuum sintering furnace
After knot, two stage treatment is carried out, Primary product is obtained；Sintering temperature is 1030 DEG C, and sintering time is 2 hours.
(6) the resultant plasma body for obtaining step (5) is handled, and is then immersed in perfluoro polyether oil, immersion oil mistake
100 DEG C are kept in journey, drying is taken out after impregnating 24 hours, and the radiation field internal irradiation being then placed under atmosphere of inert gases makes complete
Polymerisation occurs for perfluoroalkyl polyether, finally dries product to obtain the Nd-Fe-B permanent magnet material.
It tests the bending strength for not strengthening and strengthening magnet respectively using three-point bending test and SENB methods and is broken tough
Property, it is as a result as follows：
| Test magnet types | Bending strength (MPa) | Fracture toughness (MPa-m1/2) |
| Do not strengthen magnet | 230 | 3.71 |
| Strengthen magnet | 322 | 4.08 |
Embodiment 2：
A kind of high intensity Nd-Fe-B permanent magnet material of the present invention, the Nd-Fe-B permanent magnet material are each by following parts by weight
Group is grouped as：Graphene-supported nickel powder is 6%, and neodymium iron boron powder is 65%, and Zn-Al alloy powder is 15%；
Its preparation method is as follows：
(1) Fe, Nd and B are mixed and is placed on intermediate frequency vacuum induction melting furnace and carries out melting, obtain neodymium iron boron, wherein Fe,
The mass ratio of Nd, B are 72: 26: 1；
(2) neodymium iron boron that step (1) obtains is processed as neodymium iron boron powder by airflow milling；
(3) neodymium iron boron powder obtained above, graphene-supported nickel by powder and Zn-Al alloy powder are put into ball mill
Ball mill mixing is carried out, and is added thereto and 0.5% oleic acid is added as dispersant, is then sufficiently mixed；Each component
Mass fraction matches：Graphene-supported nickel powder is 6%, and neodymium iron boron powder is 65%, and Zn-Al alloy powder is 15%；Graphene
The granularity for loading nickel by powder is 80 μm, and the grain size of Zn-Al alloy powder is 100 μm.
(4) by upper well-mixed powder in diffusion furnace by 230 DEG C, low temperature diffusion is carried out under the protection of N gas, is made
The advance alloying of part metals；
(5) mixture for obtaining step (4) oriented moulding and isostatic pressed in being orientated field, then burnt by vacuum sintering furnace
After knot, two stage treatment is carried out, Primary product is obtained；Sintering temperature is 1030 DEG C, and sintering time is 2 hours.
(6) the resultant plasma body for obtaining step (5) is handled, and is then immersed in perfluoro polyether oil, immersion oil mistake
100 DEG C are kept in journey, drying is taken out after impregnating 24 hours, and the radiation field internal irradiation being then placed under atmosphere of inert gases makes complete
Polymerisation occurs for perfluoroalkyl polyether, finally dries product to obtain the Nd-Fe-B permanent magnet material.
It tests the bending strength for not strengthening and strengthening magnet respectively using three-point bending test and SENB methods and is broken tough
Property, it is as a result as follows：
| Test magnet types | Bending strength (MPa) | Fracture toughness (MPa-m1/2) |
| Do not strengthen magnet | 271 | 3.25 |
| Strengthen magnet | 352 | 3.57 |
Embodiment 3：
A kind of high intensity Nd-Fe-B permanent magnet material of the present invention of the present invention, the Nd-Fe-B permanent magnet material is by following weight
The each group of number is grouped as：Graphene-supported nickel powder is 3.2%, and neodymium iron boron powder is 78%, and Zn-Al alloy powder is 9.5%.
Its preparation method is as follows：
(1) Fe, Nd and B are mixed and is placed on intermediate frequency vacuum induction melting furnace and carries out melting, obtain neodymium iron boron, wherein Fe,
The mass ratio of Nd, B are 72: 26: 1；
(2) neodymium iron boron that step (1) obtains is processed as neodymium iron boron powder by airflow milling；
(3) neodymium iron boron powder obtained above, graphene-supported nickel by powder and Zn-Al alloy powder are put into ball mill
Ball mill mixing is carried out, and is added thereto and 0.1% oleic acid is added as dispersant, is then sufficiently mixed；Each component
Mass fraction matches：Graphene-supported nickel powder is 3.2%, and neodymium iron boron powder is 78%, and Zn-Al alloy powder is 9.5%；Graphite
The granularity that alkene loads nickel by powder is 80 μm, and the grain size of Zn-Al alloy powder is 100 μm.
(4) by upper well-mixed powder in diffusion furnace by 230 DEG C, low temperature diffusion is carried out under the protection of N gas, is made
The advance alloying of part metals；
(5) mixture for obtaining step (4) oriented moulding and isostatic pressed in being orientated field, then burnt by vacuum sintering furnace
After knot, two stage treatment is carried out, Primary product is obtained；Sintering temperature is 1030 DEG C, and sintering time is 2 hours.
(6) the resultant plasma body for obtaining step (5) is handled, and is then immersed in perfluoro polyether oil, immersion oil mistake
100 DEG C are kept in journey, drying is taken out after impregnating 20 hours, and the radiation field internal irradiation being then placed under atmosphere of inert gases makes complete
Polymerisation occurs for perfluoroalkyl polyether, finally dries product to obtain the Nd-Fe-B permanent magnet material.
It tests the bending strength for not strengthening and strengthening magnet respectively using three-point bending test and SENB methods and is broken tough
Property, it is as a result as follows：
| Test magnet types | Bending strength (MPa) | Fracture toughness (MPa-m1/2) |
| Do not strengthen magnet | 256 | 3.48 |
| Strengthen magnet | 314 | 3.66 |
The present invention uses graphene-supported nickel for reinforcement, so that graphene is evenly distributed in neodymium iron boron matrix, and make
Graphene is fully effectively bonded with metal interface, is handled by mixing low temp diffusion technique, makes sintered body surface in spongy thin
Small through hole, for porosity communication rate up to 95% or more, maximum plays the characteristic of graphene, effectively improves intensity and the heat conduction of permanent-magnet material
Performance is sintered in addition, and graphene lubricant layer is formd around neodymium iron boron particles, further increases the wearability of permanent-magnet material
Energy.Therefore, the method for the present invention can significantly improve the obdurability of permanent-magnet material under the premise of keeping high magnetic characteristics, realize high
The matched well of magnetic property and high-strength tenacity further expands its application range.Present invention process process is simple, easy to operate, fits
In large-scale batch production, therefore, the high tough Sintered NdFeB magnet of high magnetic characteristics can be prepared through the invention.
Claims (5)
1. a kind of high intensity Nd-Fe-B permanent magnet material, which is characterized in that the Nd-Fe-B permanent magnet material is by following parts by weight
Each group is grouped as：
Graphene-supported nickel powder is 1-6%, and neodymium iron boron powder is 65-90%, and Zn-Al alloy powder is 6-15%.
2. a kind of preparation method of high intensity Nd-Fe-B permanent magnet material according to claim 1, which is characterized in that the stone
The granularity of black alkene load nickel by powder is 80-100 μm.
3. a kind of preparation method of high intensity Nd-Fe-B permanent magnet material according to claim 1, which is characterized in that described
The grain size of Zn-Al alloy powder is 100~500 μm.
4. a kind of preparation method of high intensity Nd-Fe-B permanent magnet material according to claim 1, which is characterized in that neodymium iron boron
Permanent-magnet material is grouped as by each group of following parts by weight：Graphene-supported nickel powder is 1.5-5.6%, and neodymium iron boron powder is 70-
85%, Zn-Al alloy powder is 8-12%.
5. a kind of preparation method of high intensity Nd-Fe-B permanent magnet material according to claim 1, which is characterized in that neodymium iron boron
Permanent-magnet material is grouped as by each group of following parts by weight：Graphene-supported nickel powder is 3.2%, and neodymium iron boron powder is 78%, Zn-
Al alloyed powders are 9.5%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509604A (en) * | 2018-12-18 | 2019-03-22 | 宁波中杭磁材有限公司 | A kind of preparation method of neodymium iron boron magnetic body |
| CN109604618A (en) * | 2018-12-18 | 2019-04-12 | 宁波中杭磁材有限公司 | A kind of preparation method of the neodymium iron boron magnetic body of surface with wear-resistant coating |
| CN109686557A (en) * | 2018-12-18 | 2019-04-26 | 宁波中杭磁材有限公司 | A kind of preparation method of corrosion-resistant Ne-Fe-B magnet |
| CN109692963A (en) * | 2018-12-18 | 2019-04-30 | 宁波中杭磁材有限公司 | A kind of preparation method of the neodymium iron boron magnetic body of surface with corrosion-resistant finishes |
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| CN103559972A (en) * | 2013-11-13 | 2014-02-05 | 北京科技大学 | Preparation method for sintered Nd-Fe-B permanent-magnet material |
| CN105689722A (en) * | 2016-01-23 | 2016-06-22 | 河北工程大学 | Copper-based oil bearing material and preparation method thereof |
| CN106601463A (en) * | 2016-12-09 | 2017-04-26 | 宁波大榭开发区银鑫磁业有限公司 | Neodymium-iron-boron permanent magnet material |
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Patent Citations (3)
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| CN103559972A (en) * | 2013-11-13 | 2014-02-05 | 北京科技大学 | Preparation method for sintered Nd-Fe-B permanent-magnet material |
| CN105689722A (en) * | 2016-01-23 | 2016-06-22 | 河北工程大学 | Copper-based oil bearing material and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509604A (en) * | 2018-12-18 | 2019-03-22 | 宁波中杭磁材有限公司 | A kind of preparation method of neodymium iron boron magnetic body |
| CN109604618A (en) * | 2018-12-18 | 2019-04-12 | 宁波中杭磁材有限公司 | A kind of preparation method of the neodymium iron boron magnetic body of surface with wear-resistant coating |
| CN109686557A (en) * | 2018-12-18 | 2019-04-26 | 宁波中杭磁材有限公司 | A kind of preparation method of corrosion-resistant Ne-Fe-B magnet |
| CN109692963A (en) * | 2018-12-18 | 2019-04-30 | 宁波中杭磁材有限公司 | A kind of preparation method of the neodymium iron boron magnetic body of surface with corrosion-resistant finishes |
| CN109509604B (en) * | 2018-12-18 | 2021-02-19 | 宁波中杭磁材有限公司 | Preparation method of neodymium iron boron magnet |
| CN109686557B (en) * | 2018-12-18 | 2021-08-10 | 宁波中杭磁材有限公司 | Preparation method of corrosion-resistant neodymium iron boron magnet |
| CN109604618B (en) * | 2018-12-18 | 2022-06-10 | 宁波中杭磁材有限公司 | Preparation method of neodymium iron boron magnet with wear-resistant coating attached to surface |
| CN109692963B (en) * | 2018-12-18 | 2022-06-10 | 宁波中杭磁材有限公司 | Preparation method of neodymium iron boron magnet with corrosion-resistant coating attached to surface |
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