KR20150033426A - Hard-soft Composite Magnet Having Layered Structure and Method of Preparing the Same - Google Patents
Hard-soft Composite Magnet Having Layered Structure and Method of Preparing the Same Download PDFInfo
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- KR20150033426A KR20150033426A KR20130113434A KR20130113434A KR20150033426A KR 20150033426 A KR20150033426 A KR 20150033426A KR 20130113434 A KR20130113434 A KR 20130113434A KR 20130113434 A KR20130113434 A KR 20130113434A KR 20150033426 A KR20150033426 A KR 20150033426A
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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
- H01F1/33—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin
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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
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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
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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
- H01F1/34—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 non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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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
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- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
TECHNICAL FIELD The present invention relates to a hard magnetic composite magnet having a layered structure and a method for manufacturing the same.
Neodymium magnet is a molded piece composed mainly of neodymium (Nd), iron oxide (Fe) and boron (B) and exhibits excellent magnetic properties. Demand for such high-performance neodymium (Nd) bulk magnets is on the rise, but due to the imbalance in the supply and demand of rare earth elements, it is a major obstacle to the supply of high-performance motors required in the next generation industries.
A ferrite magnet is an inexpensive magnet used when a magnetic property is stable and does not require a magnet having a strong magnetic force, and is usually black. Ferrite magnets are used in various applications such as DC motors, compasses, telephones, tachometers, speakers, speed meters, TVs, reed switches, and watch movements. They are lightweight and inexpensive, but replace expensive neodymium (Nd) bulk magnets There is a problem in that it can not exhibit excellent magnetic properties. Therefore, there is a need to develop a novel magnetic material having high properties that can replace rare earth magnets.
The newly proposed new concept magnet is a magnet using Exchange-coupling phenomenon. It is a magnet using the exchange magnetic force which occurs at the interface between the soft magnetic material and the soft magnetic material in the composite of the nano-sized soft magnetic material and the hard magnetic material. These soft magnetic compound composites have higher efficiency than rare earth magnets, and have been attracting attention as a next generation magnet, and many studies have been made.
However, as has been studied so far, such a soft magnetic composite structure has to be manufactured in a thin film form, and therefore, it is not suitable for applications requiring a constant thickness. These thin film composite magnets are usually manufactured by depositing to a thickness of 10 to 40 nanometers.
Numerous papers and patent documents are referenced and cited throughout this specification. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety to better understand the state of the art to which the present invention pertains and the content of the present invention.
The present inventors have made efforts to develop a novel magnetic material having high properties capable of replacing expensive rare earth bulk magnets, and as a result, the light / soft magnetic composite layer having a layer structure has excellent coercive force and saturation flux density And the present invention can be realized at the same time.
Accordingly, an object of the present invention is to provide a hard-magnetic composite bulk magnet having a layered structure.
It is another object of the present invention to provide a method of manufacturing a light-rare-soft composite bulk magnet having the above layer structure.
Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.
One aspect of the present invention is a bulk magnet having a hard magnetic composite layer structure, characterized in that at least two hard magnetic layers and at least one soft magnetic layer form alternately layers, and a hard magnetic layer is arranged on the outermost layers of the magnets To the magnet.
It has been recognized that the conventional soft magnetic composite structure should be manufactured in the form of a thin film having an atomic level layer in order to utilize the exchange magnetic force generated at the interface. However, the present inventors have found that an excellent coercive force value and a saturated magnetic flux density Magnetic composite multi-layer structure magnets which can be made of a soft magnetic material.
In order to simultaneously realize an excellent coercive force value and a saturation magnetic flux density, a hard magnetic layer must be arranged outside the easy magnetization axis of the magnet. This means that a soft magnetic layer is inserted between the hard magnetic layers, To suppress decay.
When a sintered body or a bonded magnet is manufactured using the composite bulk magnet having a hard magnetic composite layer structure of the present invention, it is possible to provide a composite suitable for a high-performance permanent magnet having a saturation magnetization value significantly improved as compared with a conventional magnet.
In one embodiment, the hard magnetic layer may include at least one selected from the group consisting of strontium ferrite, cobalt ferrite and barium ferrite, SmCo, NdFeB, MnBi, MnAl and SmFeN. Examples of the soft magnetic layer include Fe, Co, Ni, FeCo, FeNi, FeSi, and CoNi may be used, but the present invention is not limited thereto.
The bulk magnet having the soft magnetic mixed layer structure according to the present invention can control the thickness of the soft magnetic layer, so that it is possible to control the coercive force intensity and magnetization value magnitude in a magnet having a layered composite structure. The layered composite structure is an advantageous method for producing high-quality magnets with uniaxial anisotropy.
In one embodiment, the magnet of the present invention comprises 80 to 99 weight percent hard magnetic layer and 1 to 20 weight percent soft magnetic layer.
In another embodiment, the thickness of the hard magnetic layer is 100 μm to 100 mm, and the thickness of the soft magnetic layer is 10 μm to 10 mm.
The number of layers included in the magnet of the present invention is not particularly limited. For example, the number of the hard magnetic layers may be 2 to 100, the number of the soft magnetic layers may be 1 to 99, the number of the hard magnetic layers may be 2 to 50, 1 to 49 magnetic layers, 2 to 10 hard magnetic layers, and 1 to 9 soft magnetic layers.
As described above, since the coercive force value and the saturation magnetic flux density can be controlled by properly controlling the thickness of the hard magnetic composite layer structure and the content ratio of the soft magnetic component and / or the number of the hard magnetic layers, It is possible to easily provide a magnet having a magnetic field.
According to another aspect of the present invention, there is provided a magnetic recording medium comprising: a sheet-like hard magnetic layer and a sheet-like soft magnetic layer; Forming a composite layer structure by alternately arranging the hard magnetic layer and the soft magnetic layer so that the hard magnetic layer is located in the outer region; And compressing and molding the disposed composite layer structure. The present invention also provides a method of manufacturing a composite magnet having a layered structure.
In one embodiment, the step of producing a sheet-like hard magnetic layer comprises mixing the hard magnetic nano powder with a sintering aid; Passing the mixture through a roller while applying an external magnetic field to produce a sheet shape; And sintering the prepared hard magnetic powder-sintering auxiliary admixture sheet.
As the sintering aid, a rare earth compound or an alkaline earth metal oxide may be used. For example, the sintering aid may be selected from the group consisting of SiO 2 , CaCO 3 , SrCO 3 , Al 2 O 3 , Bi 2 O 3 , MgO, CaO, SrO, BaO, Y 2 O 3 , La 2 O 3 , CeO 2 , PrO 2 , Nd 2 O 3 , Sm 2 O 3 , Gd 2 O 3 , Dy 2 O 3, and combinations thereof, but the present invention is not limited thereto. The layered composite permanent magnet is advantageous for controlling the redox reaction at the metal-oxide interface. Hot press sintering, hot isotactic pressing, spark plasma sintering, furnace sintering, and sintering are used as selective heat treatment at low temperature for particle growth and oxidation inhibition in the manufacture of densified magnets. And microwave sintering may be used, but the present invention is not limited thereto.
In one embodiment, when the interface between the hard magnetic layer and the soft magnetic layer is a metal-oxide interface, a metal oxide or non-metal compound such as calcium oxide may be included between the hard magnetic layer and the soft magnetic layer .
The bulk magnet having the light / soft magnetic hybrid layer structure of the present invention can be manufactured by a relatively simple process, and simultaneously achieves excellent coercive force and saturation magnetization value, thereby overcoming the limitations of physical and magnetic properties of existing single- can do.
FIG. 1 illustrates an example of a layered structure of a soft magnetic hybrid A process for producing a bulk magnet is schematized.
Fig. 2 shows the magnetic hysteresis curves of the bulk magnet produced in the examples.
3 is a sectional view of the bulk magnet produced in the example by a scanning electron microscope (SEM).
Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for describing the present invention more specifically and that the scope of the present invention is not limited by these embodiments.
Example
Competition Magnetic Hybrid Layer structure Manufacture of bulk magnets with
According to the schematic diagram shown in Fig. 1, A bulk magnet was prepared. Specifically, strontium ferrite nano powders prepared by spray pyrolysis with a light-diffusing property are mixed with SiO 2 (1.2 to 0.2 wt%), CaCO 3 (1.5 to 0.5 wt%), SrCO 3 (1.0 to 0.1 wt%), Al 2 O 3 (1.0 to 0.1 wt%) and Bi 2 O 3 (1.0 to 0.1 wt%) were added and mixed. And sintered to prepare a strontium ferrite hard magnetic layer having a thickness of 2 mm.
As the soft phase, 43 g of FeCo powder of 20 nm in size prepared by coprecipitation with ultrasonic waves, 2 g of DOP (DiOctyl Phtalate), 2 g of DBP (Dibutyl Phtalate), 0.47 g of RS-610 (Rhodia) 5 g of SZ (Sekisui) and 48.33 g of Solvent were used to prepare a soft magnetic layer in the form of a sheet having a thickness of 0.2 mm.
Using the three hard magnetic layer sheets prepared above and two soft magnetic layer sheets, the hard magnetic layer and the soft magnetic layer were arranged alternately so that the hard magnetic layer was located in the outer region, and compression molding was carried out at about 350 DEG C under a pressure of 50 MPa, A bulk magnet having a hard magnetic composite layer structure was prepared.
Magnet performance test
The magnetic properties of the prepared bulk magnet were confirmed using VSM (vibrating sample magnetometer, Lake Shore # 7300 USA, maximum 20 kOe) and the measured magnetic hysteresis curve is shown in FIG.
As a result, a one-phase magnetic graph was obtained in spite of the existence of the hard magnetic layer and the soft magnetic layer having a considerable thickness in the bulk magnet, and the coercive force and the saturation magnetization value were 3006 Oe and 95 emu / g respectively, The saturation magnetic flux density was realized at the same time.
Scanning Electron Microscope ( SEM )
FIG. 3 shows the cross-sectional state of the bulk magnet having the layered structure of the soft magnetic mixed layer prepared by the above method by scanning electron microscope (SEM).
FIG. 3 shows the characteristics of a bulk magnet having a composite structure of hard magnetic / soft magnetic properties without oxidation of the soft magnetic phase or reduction of the hard magnetic phase.
Claims (8)
Wherein at least two hard magnetic layers and at least one soft magnetic layer alternately form a layer and a hard magnetic layer is arranged in an outermost layer in the axial direction of the magnet.
Forming a composite layer structure by alternately arranging the hard magnetic layer and the soft magnetic layer so that the hard magnetic layer is located in the outer region; And
The method of manufacturing a magnet according to claim 1, comprising compressing the disposed multiple layer structure.
Mixing the hard magnetic nano powder with a sintering aid;
Passing the mixture through a roller while applying an external magnetic field to produce a sheet shape; And
And sintering the hard magnetic powder-sintering auxiliary admixture sheet prepared as described above.
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| KR1020130113434A KR102043951B1 (en) | 2013-09-24 | 2013-09-24 | Hard-soft Composite Magnet Having Layered Structure and Method of Preparing the Same |
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| KR1020130113434A KR102043951B1 (en) | 2013-09-24 | 2013-09-24 | Hard-soft Composite Magnet Having Layered Structure and Method of Preparing the Same |
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| KR102043951B1 KR102043951B1 (en) | 2019-11-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101585483B1 (en) | 2015-04-29 | 2016-01-15 | 엘지전자 주식회사 | Sintered Magnet Based on MnBi Having Improved Heat Stability and Method of Preparing the Same |
| KR101585479B1 (en) | 2015-04-20 | 2016-01-15 | 엘지전자 주식회사 | Anisotropic Complex Sintered Magnet Comprising MnBi and Atmospheric Sintering Process for Preparing the Same |
| CN106971803A (en) * | 2017-04-19 | 2017-07-21 | 重庆科技学院 | A kind of preparation method of complete fine and close anisotropy NdFeB/MnBi hybrid permanent magnets |
| KR20200050272A (en) | 2018-11-01 | 2020-05-11 | 울산과학기술원 | Permanent magnet having advanced magnetic performance and method for manufacturing thereof |
| WO2020116787A1 (en) * | 2018-12-05 | 2020-06-11 | 한국전기연구원 | Method for manufacturing soft magnetic/hard magnetic multi-layer bulk, and soft magnetic/hard magnetic multi-layer bulk manufactured by same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000042377A (en) | 1998-12-24 | 2000-07-15 | 박호군 | Method for manufacturing a permanent magnet film |
| JP2006173210A (en) * | 2004-12-13 | 2006-06-29 | National Institute For Materials Science | Nano composite magnet and its manufacturing method |
| KR20130090241A (en) * | 2012-02-03 | 2013-08-13 | 엘지전자 주식회사 | Core-shell structured nanoparticle having hard-soft magnetic heterostructure, magnet prepared with said nanoparticle, and preparing method thereof |
-
2013
- 2013-09-24 KR KR1020130113434A patent/KR102043951B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000042377A (en) | 1998-12-24 | 2000-07-15 | 박호군 | Method for manufacturing a permanent magnet film |
| JP2006173210A (en) * | 2004-12-13 | 2006-06-29 | National Institute For Materials Science | Nano composite magnet and its manufacturing method |
| KR20130090241A (en) * | 2012-02-03 | 2013-08-13 | 엘지전자 주식회사 | Core-shell structured nanoparticle having hard-soft magnetic heterostructure, magnet prepared with said nanoparticle, and preparing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101585479B1 (en) | 2015-04-20 | 2016-01-15 | 엘지전자 주식회사 | Anisotropic Complex Sintered Magnet Comprising MnBi and Atmospheric Sintering Process for Preparing the Same |
| KR101585483B1 (en) | 2015-04-29 | 2016-01-15 | 엘지전자 주식회사 | Sintered Magnet Based on MnBi Having Improved Heat Stability and Method of Preparing the Same |
| CN106971803A (en) * | 2017-04-19 | 2017-07-21 | 重庆科技学院 | A kind of preparation method of complete fine and close anisotropy NdFeB/MnBi hybrid permanent magnets |
| CN106971803B (en) * | 2017-04-19 | 2019-03-19 | 重庆科技学院 | A kind of preparation method of complete fine and close anisotropy NdFeB/MnBi hybrid permanent magnet |
| KR20200050272A (en) | 2018-11-01 | 2020-05-11 | 울산과학기술원 | Permanent magnet having advanced magnetic performance and method for manufacturing thereof |
| WO2020116787A1 (en) * | 2018-12-05 | 2020-06-11 | 한국전기연구원 | Method for manufacturing soft magnetic/hard magnetic multi-layer bulk, and soft magnetic/hard magnetic multi-layer bulk manufactured by same |
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| KR102043951B1 (en) | 2019-11-12 |
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