CN105537577A - Nd-Fe-B powder particle dynamic orientation method - Google Patents
Nd-Fe-B powder particle dynamic orientation method Download PDFInfo
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- CN105537577A CN105537577A CN201510952895.3A CN201510952895A CN105537577A CN 105537577 A CN105537577 A CN 105537577A CN 201510952895 A CN201510952895 A CN 201510952895A CN 105537577 A CN105537577 A CN 105537577A
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- China
- Prior art keywords
- powder particle
- orientation
- magnetic field
- powder
- external magnetic
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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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
- H01F1/032—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a Nd-Fe-B powder particle dynamic orientation method. In a free falling process of Nd-Fe-B powder particles, an external magnetic field is applied for orientation. By the dynamic orientation method, the degree of orientation of the Nd-Fe-B powder particles in a magnetic field is improved effectively, so that the sintered Nd-Fe-B permanent magnet is compact and even, and is high in degree of orientation, good in consistency and high in performance.
Description
Technical field
The present invention relates to field of rare-earth permanent magnetic, particularly a kind of Nd-Fe-B powder particle dynamic orientation method.
Background technology
At present, known Sintered Nd-Fe-B Magnet produce broken by melting, hydrogen, powder process, the operation such as shaping, sintering form.The magnetic property of sintered Nd-Fe-B based magnet is mainly derived from the Nd with tetragonal
2fe
14b matrix phase (being commonly called as Nd-Fe-B powder particle).It is uniaxial crystal, and c-axis is easy magnetizing axis.When magnetizing along its easy magnetizing axis, there is maximum remanent magnetism Br=u
0m
s.If the direction of magnetization becomes θ during with its easy magnetizing axis c, then remanent magnetism only has Br=u
0m
scos θ, visible θ angle is less, and remanent magnetism is larger.But the degree of orientation Jr/Js of known sintered Nd-Fe-B based permanent magnet magnet steel is between 0.83 ~ 0.95, thus make the performance of product (remanent magnetism, coercivity, magnetic energy product etc.) uniformity poor.Therefore, the degree of orientation how improving sintered Nd-Fe-B based permanent magnet magnet steel is one of key technology instantly manufacturing the good Sintered Nd-Fe-B Magnet of uniformity.
But, the c-axis degree of orientation of powder particle is subject to the impact of many factors, such as, orientation external magnetic field strength size, powder particle shape and Size Distribution and surface state, molding mode, orientation field and the relative direction of briquetting pressure and the first dress density etc. of orientation powder.If improve orientation external magnetic field, need huge current control device and high-performance permeability magnetic material, equipment manufacturing cost is expensive, and operation expense is suddenly high.If make the shape approximation of powder particle spherical, need in the process of powder process, to add trace oxygen with the corner angle of oxide powder particle, thus the yield of powder process operation is reduced; If the first shape density ensureing powder is apparent density, needs increase to sieve and frock of feeding, add manufacturing time; If make powder particle be easy to turn to, in particle, add certain lubricant, thus inevitably have impact on the composition of powder.Etc. these all ultimately increase the manufacturing cost of final product or the performance of product had an impact, be unfavorable for industrial-scale production.
The information being disclosed in this background technology part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.
Summary of the invention
The object of the present invention is to provide a kind of Nd-Fe-B powder particle dynamic orientation method, effectively improve Nd-Fe-B powder particle degree of orientation in magnetic field.
For achieving the above object, the invention provides a kind of Nd-Fe-B powder particle dynamic orientation method, this Nd-Fe-B powder particle applies external magnetic field and carries out orientation in the process of freely falling body.
Preferably, Nd-Fe-B powder particle is compressing in die cavity, and the process that Nd-Fe-B powder particle is falling into die cavity carries out orientation.
Preferably, Nd-Fe-B powder particle is deposited in mold cavity bottoms gradually, and the Nd-Fe-B powder particle being in mold cavity bottoms is pressed when lasting maintenance external magnetic field.
Preferably, Nd-Fe-B powder particle is slipped in die cavity by introduction channel.
Compared with prior art, the present invention has following beneficial effect: by just carrying out orientation in the process of Nd-Fe-B powder particle at freely falling body, powder particle is when freely falling body, separation or empty contact condition is between particle, mechanical resistance each other and frictional force do not exist or very little, like this, the c-axis of Nd-Fe-B powder particle has forwarded the direction of external magnetic field completely under the effect only having external magnetic field, pass through this method, effectively can improve Nd-Fe-B powder particle degree of orientation in magnetic field, thus the Nd-Fe-B permanent magnet dense uniform that sintering is gone out, the degree of orientation is high, uniformity is good, performance is high.
Accompanying drawing explanation
Fig. 1 is the right view according to a kind of die cavity related in Nd-Fe-B powder particle dynamic orientation method of the present invention;
Fig. 2 is the front view of the orientation signal die cavity according to Nd-Fe-B powder particle dynamic orientation method of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention not by the restriction of detailed description of the invention.
Clearly represent unless otherwise other, otherwise in whole description and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or part, and do not get rid of other element or other part.
According to a kind of Nd-Fe-B powder particle dynamic orientation method of the specific embodiment of the invention, this Nd-Fe-B powder particle applies external magnetic field and carries out orientation in the process of freely falling body.
This programme changes traditional orientation of particles method, by just carrying out orientation in the process of Nd-Fe-B powder particle at freely falling body, powder particle is when freely falling body, separation or empty contact condition is between particle, mechanical resistance each other and frictional force do not exist or very little, like this, the c-axis of Nd-Fe-B powder particle has forwarded the direction of external magnetic field completely under the effect only having external magnetic field.By this method, Nd-Fe-B powder particle degree of orientation in magnetic field effectively can be improved, thus the Nd-Fe-B permanent magnet dense uniform that sintering is gone out, the degree of orientation is high, and uniformity is good, and performance is high.This method for alignment drops into little, simple, avoids splashing during powder compacting, is applicable to very much actual use.
As a kind of preferred embodiment, compressing in die cavity 2 see Fig. 1 and Fig. 2, Nd-Fe-B powder particle, Nd-Fe-B powder particle is falling into the process of die cavity 2, carries out orientation to the Nd-Fe-B powder particle 4 fallen.In the present embodiment, due to Nd-Fe-B powder particle be separated each other during freely falling body in die cavity 2 or virtual connection touch, mechanical resistance between particle and frictional force almost nil, after now introducing external magnetic field 1, the c-axis of each Nd-Fe-B powder particle just can turn to the direction H of external magnetic field easily, thus orientation very regularly.
As a kind of preferred embodiment, Nd-Fe-B powder particle is deposited in mold cavity bottoms gradually, and the Nd-Fe-B powder particle being in mold cavity bottoms is pressed when lasting maintenance external magnetic field.In the present embodiment, along with the whereabouts of Nd-Fe-B powder particle, the Nd-Fe-B powder particle that orientation is good is piled again at mold cavity bottoms and is got together, and forms minimum apparent density.When now keeping external magnetic field, the Nd-Fe-B powder particle 5 good to the orientation fallen is pressed, thus forms the highest best forming workblank of the degree of orientation.
As a kind of preferred embodiment, Nd-Fe-B powder particle slips into (see Fig. 2) in die cavity 2 by introduction channel 3.In the present embodiment, introduction channel 3 is moved on to die cavity 2 mouthfuls place, and start to add Nd-Fe-B powder particle in introduction channel 3, Nd-Fe-B powder particle slides along introduction channel 3 and slips into freely falling body in die cavity 2.To be separated each other when freely falling body due to Nd-Fe-B powder particle or virtual connection is touched, mechanical resistance between particle and frictional force almost nil, now introduce after external magnetic field, the c-axis of each Nd-Fe-B powder particle just can turn to the direction of external magnetic field easily, thus orientation very regularly.Now removing introduction channel, being pressed when keeping external magnetic field, thus form the highest best forming workblank of the degree of orientation.
Because the degree of orientation of Nd-Fe-B powder particle can not directly be measured, carry out indirect reaction by the degree of orientation measuring the Nd-Fe-B magnet steel after having sintered.
The Nd-Fe-B powder particle getting same lot number is divided into two parts, a moulding process adopting dynamic orientation, and a employing conventional molding process, in addition other working conditions are identical.Finally measure the degree of orientation of the Nd-Fe-B magnet steel sintered out, result is: adopt the degree of orientation Jr/Js scope of the magnet steel of conventional molding process between 0.82 ~ 0.87, adopts the degree of orientation Jr/Js scope of the magnet steel of dynamic orientation moulding process between 0.94 ~ 0.96.
The above results has absolutely proved that Nd-Fe-B powder particle dynamic molding orientation plays conclusive effect to the raising degree of orientation.
The aforementioned description to concrete exemplary of the present invention is to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present invention and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present invention and various different selection and change.Scope of the present invention is intended to limited by claims and equivalents thereof.
Claims (4)
1. a Nd-Fe-B powder particle dynamic orientation method, is characterized in that, this Nd-Fe-B powder particle applies external magnetic field and carries out orientation in the process of freely falling body.
2. Nd-Fe-B powder particle dynamic orientation method according to claim 1, it is characterized in that, described Nd-Fe-B powder particle is compressing in die cavity, and the process that described Nd-Fe-B powder particle is falling into described die cavity carries out orientation.
3. Nd-Fe-B powder particle dynamic orientation method according to claim 2, it is characterized in that, described Nd-Fe-B powder particle is deposited in described mold cavity bottoms gradually, and the Nd-Fe-B powder particle being in described mold cavity bottoms is pressed when lasting maintenance external magnetic field.
4. Nd-Fe-B powder particle dynamic orientation method according to claim 3, it is characterized in that, described Nd-Fe-B powder particle is slipped in described die cavity by introduction channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510952895.3A CN105537577A (en) | 2015-12-17 | 2015-12-17 | Nd-Fe-B powder particle dynamic orientation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510952895.3A CN105537577A (en) | 2015-12-17 | 2015-12-17 | Nd-Fe-B powder particle dynamic orientation method |
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| Publication Number | Publication Date |
|---|---|
| CN105537577A true CN105537577A (en) | 2016-05-04 |
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ID=55817395
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510952895.3A Pending CN105537577A (en) | 2015-12-17 | 2015-12-17 | Nd-Fe-B powder particle dynamic orientation method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299140A (en) * | 1999-12-09 | 2001-06-13 | 住友特殊金属株式会社 | Method and device for supplying magnetic powder, and magnet mfg. method |
| CN201565604U (en) * | 2009-11-12 | 2010-09-01 | 南通天王液压成套厂 | Hopper of powder molding hydrodynamic press |
| EP2913831A1 (en) * | 2012-10-23 | 2015-09-02 | Toyota Jidosha Kabushiki Kaisha | Rare-earth-magnet production method |
-
2015
- 2015-12-17 CN CN201510952895.3A patent/CN105537577A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299140A (en) * | 1999-12-09 | 2001-06-13 | 住友特殊金属株式会社 | Method and device for supplying magnetic powder, and magnet mfg. method |
| CN201565604U (en) * | 2009-11-12 | 2010-09-01 | 南通天王液压成套厂 | Hopper of powder molding hydrodynamic press |
| EP2913831A1 (en) * | 2012-10-23 | 2015-09-02 | Toyota Jidosha Kabushiki Kaisha | Rare-earth-magnet production method |
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Application publication date: 20160504 |
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