JPH088111A - Anisotropic permanent magnet and its manufacturing method - Google Patents
Anisotropic permanent magnet and its manufacturing methodInfo
- Publication number
- JPH088111A JPH088111A JP6141966A JP14196694A JPH088111A JP H088111 A JPH088111 A JP H088111A JP 6141966 A JP6141966 A JP 6141966A JP 14196694 A JP14196694 A JP 14196694A JP H088111 A JPH088111 A JP H088111A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- permanent magnet
- sheet
- sheets
- anisotropic permanent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H01F41/14—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 applying magnetic films to substrates
- H01F41/16—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 applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種電子部品，例えば
移動通信機器を構成するサーキュレータ，アイソレータ
等に採用される異方性永久磁石及びその製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anisotropic permanent magnet used for various electronic parts such as circulators and isolators which constitute mobile communication devices, and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】例えば、サーキュレータ，アイソレータ
に採用される異方性永久磁石は、化学式ＭｅＯ・６Ｆｅ
2 Ｏ3 で表されるマグネトプランバイト型六方晶系の結
晶構造からなるフェライトを主成分としたものである。
上記永久磁石の結晶はＣ軸方向に磁気容易軸を有し、平
板状の結晶粒子となる。この磁気容易軸は結晶のＣ軸を
成形する際に磁気を一方向に配向させ、これを焼成する
ことにより得られる。このような異方性永久磁石は、残
留磁束密度，保磁力，及びＢＨ積エネルギーに優れた磁
気特性を有している。2. Description of the Related Art For example, anisotropic permanent magnets used in circulators and isolators have a chemical formula of MeO.6Fe.
The main component is ferrite having a magnetoplumbite-type hexagonal crystal structure represented by 2 O 3 .
The crystal of the permanent magnet has a magnetic easy axis in the C-axis direction and becomes a flat crystal grain. This magnetic easy axis is obtained by orienting the magnetism in one direction when molding the C axis of the crystal and firing it. Such an anisotropic permanent magnet has excellent magnetic characteristics in residual magnetic flux density, coercive force, and BH product energy.
【０００３】上記磁気を配向させる方法としては、従
来、磁気異方性を利用して磁界を印加しながら仮焼粉を
塊状にプレス成形する磁場成形法、あるいは形状異方性
と磁気異方性とを利用してシート状に圧延成形する圧延
成形法がある。前者は高い残留磁束密度，保磁力，ＢＨ
エネルギー積が得られるという特長があり、後者は小型
で薄い成形体が得られるという特長がある。Conventionally, as a method for orienting the magnetism, a magnetic field molding method in which a calcined powder is press-molded into a lump while applying a magnetic field utilizing magnetic anisotropy, or shape anisotropy and magnetic anisotropy are used. There is a roll forming method in which a sheet is roll-formed by using and. The former is high residual magnetic flux density, coercive force, BH
The energy product is obtained, and the latter is small and compact.
【０００４】ところで、近年の各種電子機器，例えば携
帯電話等の移動通信機器では、その用途からして小型
化，薄型化とともに高性能化が進んでおり、これに伴っ
てサーキュレータ，アイソレータ等の部品においても小
型化，高性能化が要求されている。このため上記永久磁
石においても残留磁束密度，保磁力，及びＢＨ積エネル
ギー等の磁気特性の向上を図りながら、より小型化，薄
型化することが要請されている。By the way, in recent years, various electronic devices, such as mobile communication devices such as mobile phones, have been made smaller and thinner due to their applications and have been improved in performance, and along with this, parts such as circulators and isolators. In this regard, downsizing and higher performance are required. Therefore, in the above permanent magnet as well, there is a demand for further miniaturization and thinning while improving the magnetic characteristics such as residual magnetic flux density, coercive force, and BH product energy.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記従来
の磁場成形法では、磁気特性の高性能化には比較的対応
できるものの、プレス成形機を用いることから肉厚の薄
い成形体を得るのは困難である。従って、薄肉化に対応
するには焼結体を研磨加工する必要があり、製造コスト
が高騰するという問題がある。However, although the above-mentioned conventional magnetic field molding method can relatively improve the performance of the magnetic characteristics, it is difficult to obtain a thin molded body because the press molding machine is used. Is. Therefore, it is necessary to polish the sintered body in order to cope with the reduction in the thickness, and there is a problem that the manufacturing cost rises.
【０００６】また、上記従来の圧延成形法では、成形体
の薄肉化には対応できるものの、磁界の配向度が上記磁
場成形法に比べて約５０％程度と小さく、このため十分
な磁気特性が得られないという問題がある。Further, although the above-mentioned conventional rolling forming method can cope with the thinning of the formed body, the degree of orientation of the magnetic field is as small as about 50% as compared with the above-mentioned magnetic field forming method, and therefore sufficient magnetic characteristics are obtained. There is a problem that you cannot get it.
【０００７】本発明は、上記従来の状況に鑑みてなされ
たもので、磁気特性の高性能化を図りながら、コストを
上昇させることなく小型，薄型化に対応できる異方性永
久磁石及びその製造方法を提供することを目的としてい
る。The present invention has been made in view of the above-mentioned conventional circumstances, and is an anisotropic permanent magnet which can be made compact and thin without increasing the cost while improving the magnetic characteristics, and its manufacture. It is intended to provide a way.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、化学
式ＭｅＯ・６Ｆｅ2 Ｏ3 （Ｍｅは２価の金属で、Ｓｒ，
Ｂａ，Ｐｄ等がある）で表されるマグネトプランバイト
型六方晶系の結晶構造からなる異方性永久磁石におい
て、該永久磁石が、上記化学式からなる磁性体シートに
該シート面に対して垂直磁界を印加し、該磁性体シート
を積層するとともに一体焼結してなる焼結体により構成
されていることを特徴としている。According to the invention of claim 1, the chemical formula MeO.6Fe 2 O 3 (Me is a divalent metal, Sr,
Ba, Pd, etc.), an anisotropic permanent magnet having a magnetoplumbite-type hexagonal crystal structure, the permanent magnet being perpendicular to the sheet surface of the magnetic sheet having the above chemical formula. It is characterized in that it is composed of a sintered body obtained by applying a magnetic field to laminate the magnetic sheets and integrally sinter them.
【０００９】請求項２の発明は、請求項１における異方
性永久磁石の製造方法であって、上記化学式からなる磁
性体粉末とバインダとを混練してスラリーを形成する工
程と、該スラリーから磁性体シートを成形する際に該シ
ート面に対して垂直方向に磁界を印加する工程と、該磁
性体シートを積層して圧着成形した後一体焼成し、これ
により上記積層方向に磁化容易軸を持つ焼結体を得る工
程とを備えたことを特徴としている。A second aspect of the present invention is the method for producing an anisotropic permanent magnet according to the first aspect, which comprises a step of kneading the magnetic powder having the above chemical formula and a binder to form a slurry, and from the slurry. When a magnetic sheet is formed, a step of applying a magnetic field in a direction perpendicular to the sheet surface is performed, and the magnetic sheets are laminated, pressure-bonded and integrally fired, whereby an easy axis of magnetization is formed in the laminating direction. And a step of obtaining a sintered body.
【００１０】請求項３の発明は、上記焼結体の厚さが磁
性体シートの積層数により設定されていることを特徴と
している。The invention of claim 3 is characterized in that the thickness of the sintered body is set by the number of laminated magnetic sheets.
【００１１】[0011]
【作用】本発明の異方性永久磁石及びその製造方法によ
れば、磁性体シートを形成する際に該シートに垂直磁界
を印加し、該磁性体シートを積層して一体焼結したの
で、各磁性体シートの磁気配向度を向上でき、残留磁束
密度，保磁力，及びＢＨ積エネルギー等の磁気特性に優
れた焼結体が得られる。According to the anisotropic permanent magnet and the method for producing the same of the present invention, when a magnetic sheet is formed, a vertical magnetic field is applied to the magnetic sheet, and the magnetic sheets are laminated and integrally sintered. The degree of magnetic orientation of each magnetic sheet can be improved, and a sintered body having excellent magnetic characteristics such as residual magnetic flux density, coercive force, and BH product energy can be obtained.
【００１２】また本発明では、上記磁性体シートを積層
して焼結体を形成したので、該シートの積層数を設定す
ることにより焼結体の厚さを容易に制御でき、上記磁気
特性の向上を図りながら薄肉化に対応でき、研磨加工す
る場合のコストの上昇を回避できる。その結果、上述の
電子部品の小型化，薄型化，及び高性能化に対応でき
る。Further, in the present invention, since the sintered body is formed by laminating the above magnetic sheets, the thickness of the sintered body can be easily controlled by setting the number of laminated sheets, and It is possible to cope with thinning while improving, and it is possible to avoid an increase in cost when performing polishing. As a result, it is possible to cope with the above-mentioned electronic components that are smaller, thinner, and have higher performance.
【００１３】[0013]
【実施例】以下、本発明の実施例を図に基づいて説明す
る。図１ないし図３は、請求項１〜３の発明の一実施例
による異方性永久磁石及びその製造方法を説明するため
の図であり、図１は本実施例の製造装置を示す概略構成
図、図２は上記実施例の製造工程を示す分解斜視図、図
３は上記実施例の異方性永久磁石の斜視図である。本実
施例では、サーキュレータ，アイソレータに採用される
異方性永久磁石に適用した場合を例にとって説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are views for explaining an anisotropic permanent magnet and a manufacturing method thereof according to an embodiment of the inventions of claims 1 to 3, and FIG. 1 is a schematic configuration showing a manufacturing apparatus of this embodiment. 2 is an exploded perspective view showing the manufacturing process of the above embodiment, and FIG. 3 is a perspective view of the anisotropic permanent magnet of the above embodiment. In this embodiment, the case of application to an anisotropic permanent magnet used for a circulator and an isolator will be described as an example.
【００１４】本実施例のサーキュレータ，アイソレータ
は、図示していないが、複数の中心電極を互いに電気的
絶縁状態で、かつ所定角度ごとに交差させて配置し、該
交差部分にマイクロ波用フェライトを配設するととも
に、異方性永久磁石により直流磁界を印加して構成され
ている。このサーキュレータ，アイソレータは、信号を
伝送方向のみ通過させ、逆方向への伝送を阻止する機能
を有しており、例えば携帯電話，自動車電話等の移動通
信機器の送信回路部に採用される。In the circulator and isolator of this embodiment, although not shown, a plurality of center electrodes are arranged in an electrically insulated state and intersect each other at a predetermined angle, and microwave ferrite is arranged at the intersecting portions. Along with the arrangement, a DC magnetic field is applied by an anisotropic permanent magnet. These circulators and isolators have a function of passing signals only in the transmission direction and blocking transmission in the reverse direction, and are used in the transmission circuit section of mobile communication devices such as mobile phones and car phones.
【００１５】上記異方性永久磁石１は、厚さ１０〜２０
μm からなる磁性体シート２を数枚〜十数枚積層し、該
積層体を一体焼成してなる焼結体１´により構成されて
いる。上記磁性体シート２は、磁性体粉末からなるスラ
リーからグリーンシートを成形する際に、これのシート
面に対して垂直磁界を印加して形成されたものである。The anisotropic permanent magnet 1 has a thickness of 10 to 20.
It is composed of a sintered body 1 ′ obtained by laminating several to ten or more magnetic substance sheets 2 made of μm and integrally firing the laminated body. The magnetic material sheet 2 is formed by applying a perpendicular magnetic field to the surface of the green sheet when forming a green sheet from a slurry of magnetic powder.
【００１６】次に、上記異方性永久磁石１の製造装置に
ついて説明する。図１において、５は本実施例の製造装
置であり、これは搬送テーブル６の上面を搬送ロール７
ａ，７ｂにより一方向に連続搬送されるキャリアフィル
ム７と、該フィルム７上にドクターブレード法によりグ
リーンシート１３を形成するブレード８と、該ブレード
８にスラリー１４を供給する貯蔵容器９とから構成され
ている。Next, an apparatus for manufacturing the anisotropic permanent magnet 1 will be described. In FIG. 1, reference numeral 5 denotes a manufacturing apparatus of this embodiment, which is provided on the upper surface of the transport table 6 and transport rolls 7.
a carrier film 7 that is continuously conveyed in one direction by a and 7b, a blade 8 that forms a green sheet 13 on the film 7 by a doctor blade method, and a storage container 9 that supplies the slurry 14 to the blade 8. Has been done.
【００１７】上記搬送テーブル６のブレード８には第１
電磁石１０が配設されており、該電磁石１０の下流側に
は第２電磁石１１が配設されている。この各電磁石１
０，１１のＳ極１０ａ，１１ａ及びＮ極１０ｂ，１１ｂ
はそれぞれ搬送方向と直交する方向に対向しており、こ
れにより上記シート１３面に対して垂直方向に磁界が印
加されるようになっている。The blade 8 of the carrying table 6 has a first
An electromagnet 10 is provided, and a second electromagnet 11 is provided downstream of the electromagnet 10. This electromagnet 1
0 and 11 south poles 10a and 11a and north poles 10b and 11b
Are opposed to each other in a direction orthogonal to the transport direction, whereby a magnetic field is applied in a direction perpendicular to the surface of the sheet 13.
【００１８】上記第１電磁石１０の磁力は、所望のシー
ト厚さが得られる範囲で最大許容値を印加するように設
定されている。即ち、上記磁力が大き過ぎるとブレード
８からのスラリー排出量が少なくなり、十分なシート厚
が得られない場合があるからである。The magnetic force of the first electromagnet 10 is set so that the maximum allowable value is applied within a range where a desired sheet thickness can be obtained. That is, when the magnetic force is too large, the amount of the slurry discharged from the blade 8 is reduced, and a sufficient sheet thickness may not be obtained.
【００１９】また上記第２電磁石１１の磁力は、第１電
磁石１０の磁力より大きく設定されており、具体的には
５０００〜８０００〔Ｏｅ〕程度の磁場を印加するよう
に設定されている。これは上記第２電磁石１１に搬送さ
れたグリーンシート１３は乾燥しかけていることから、
スラリーが飛散したするという問題を生じないからであ
る。The magnetic force of the second electromagnet 11 is set to be larger than the magnetic force of the first electromagnet 10, and specifically, a magnetic field of about 5000 to 8000 [Oe] is applied. This is because the green sheet 13 conveyed to the second electromagnet 11 is about to dry,
This is because the problem that the slurry is scattered does not occur.
【００２０】さらに、上記第１，第２電磁石１０，１１
の各Ｓ極１０ａ，１１ａは搬送テーブル６の下面に近接
した位置に配置されており、各Ｎ極１０ｂ，１１ｂは搬
送テーブル６の上面から離れた位置に配置されている。
これにより搬送テーブル６を挟んで対向する各Ｓ極１０
ａ，１１ａとＮ極１０ｂ，１１ｂとの距離は非対象とな
っている。Further, the first and second electromagnets 10 and 11
The S poles 10a and 11a are arranged at positions close to the lower surface of the carrying table 6, and the N poles 10b and 11b are arranged at positions far from the upper surface of the carrying table 6.
As a result, the S poles 10 facing each other with the transport table 6 sandwiched therebetween
The distances between a and 11a and the N poles 10b and 11b are asymmetric.
【００２１】このように第１，第２電磁石１０，１１の
両極間距離を非対象とすることにより、磁気配向を行う
ための磁場印加と、ドクターブレード法によるグリーン
シート成形とを共用することが可能となっている。また
上記グリーンシートがめくれるのを防止している。By making the distance between the two poles of the first and second electromagnets 10 and 11 asymmetric as described above, it is possible to share the magnetic field application for magnetic orientation and the green sheet forming by the doctor blade method. It is possible. It also prevents the green sheets from turning over.
【００２２】次に、上記製造装置５による異方性永久磁
石１の一製造方法について説明する。まず、化学式Ｂａ
Ｏ・６Ｆｅ2 Ｏ3 ，又はＳｒＯ・６Ｆｅ2 Ｏ3 で表され
るマグネトプランバイト型六方晶系の結晶構造が得られ
る磁性体仮焼成粉を作成した後、単磁区粒子の臨界粒子
以下に粉砕する。この粉砕した仮粉末にポリビニルブチ
ラール，分散剤，可塑剤等を添加混合して液状の磁性体
スラリー１４を形成し、このスラリー１４を貯蔵容器９
内に充填する。Next, a method of manufacturing the anisotropic permanent magnet 1 by the manufacturing apparatus 5 will be described. First, the chemical formula Ba
After preparing a calcinated powder of a magnetic substance that gives a magnetoplumbite-type hexagonal crystal structure represented by O · 6Fe 2 O 3 or SrO · 6Fe 2 O 3, it is crushed to below the critical particles of single domain particles. To do. Polyvinyl butyral, a dispersant, a plasticizer, and the like are added to and mixed with the pulverized temporary powder to form a liquid magnetic slurry 14, and the slurry 14 is stored in the storage container 9.
Fill inside.
【００２３】上記スラリー１４をブレード８からキャリ
アフィルム７上に塗布し、厚さ１０〜２０μm のグリー
ンシート１３を形成する。この場合、上記キャリアフィ
ルム７を所定速度でもって搬送しつつ、グリーンシート
１３を２４〜８５℃の温度で乾燥させながら連続形成す
る。The slurry 14 is applied onto the carrier film 7 from the blade 8 to form a green sheet 13 having a thickness of 10 to 20 μm. In this case, while conveying the carrier film 7 at a predetermined speed, the green sheet 13 is continuously formed while being dried at a temperature of 24 to 85 ° C.
【００２４】そして上記グリーンシート１３を形成する
際に第１電磁石１０により該シート面に対して垂直方向
に磁場を印加し、続いて第２電磁石１１により同じく垂
直方向に磁場を印加する。これによりＣ軸方向に配向し
た磁化容易軸を持つ六方晶系結晶構造からなる平板状粒
子が形成される。When the green sheet 13 is formed, a magnetic field is applied by the first electromagnet 10 in a direction perpendicular to the surface of the sheet, and then a magnetic field is applied by the second electromagnet 11 in the same direction. As a result, tabular grains having a hexagonal crystal structure having an easy axis of magnetization oriented in the C-axis direction are formed.
【００２５】ここで、上記グリーンシート１３の厚さを
小さくするほど配向度は向上する。また磁場を印加する
ことにより磁化容易軸を一方向に揃えることが可能とな
り、それだけ異方性が増大する。Here, the smaller the thickness of the green sheet 13, the higher the degree of orientation. In addition, by applying a magnetic field, the easy axis of magnetization can be aligned in one direction, and the anisotropy increases accordingly.
【００２６】次に、上記グリーンシート１３を円板状に
打ち抜いて多数の磁性体シート２を形成する。この磁性
体シート２を数枚〜数十枚積層して積層体を形成した
後、積層方向に圧着して厚さ１００μm 〜数ｍｍ程度の
成形体を形成する。なお、上記グリーンシート１３を積
層した状態で成形体を打ち抜いて形成してもよい。Next, the green sheet 13 is punched into a disk shape to form a large number of magnetic material sheets 2. Several to several tens of the magnetic material sheets 2 are laminated to form a laminated body, which is then pressure-bonded in the laminating direction to form a molded body having a thickness of about 100 μm to several mm. Alternatively, the green sheets 13 may be stacked and punched from the molded body.
【００２７】次いで上記成形体を約４００℃に加熱して
脱脂した後、１０００〜１４５０℃の温度で一体焼成し
て焼結体１´を得る。このようにして得られた焼結体１
´を磁場６０００〜１１０００〔Ｏｅ〕で着磁する。こ
れにより本実施例の異方性永久磁石１が製造される。Next, the molded body is heated to about 400 ° C. to degrease it, and then integrally fired at a temperature of 1000 to 1450 ° C. to obtain a sintered body 1 '. Sintered body 1 thus obtained
Is magnetized with a magnetic field of 6000 to 11000 [Oe]. As a result, the anisotropic permanent magnet 1 of this embodiment is manufactured.
【００２８】このようにして製造された異方性永久磁石
１の磁気特性を測定したところ、残留磁束密度は０．１
８〜０．３８〔Ｔ〕，保磁力は１５０〜２５０〔ＫＡ／
ｍ〕，ＢＨ積エネルギーは２５〜３１〔ＫＪ／ｍ3 〕で
あり、従来の圧延成形法による場合と比べて１．５〜
３．７倍に向上している。When the magnetic characteristics of the anisotropic permanent magnet 1 thus manufactured were measured, the residual magnetic flux density was 0.1.
8 to 0.38 [T], coercive force of 150 to 250 [KA /
m], BH product energy is 25 to 31 [KJ / m 3 ], which is 1.5 to 100% as compared with the conventional rolling forming method.
It has improved 3.7 times.
【００２９】また上記垂直磁界を印加したグリーンシー
ト１３の配向度を調べたところ、７５〜８５％と向上し
ており、従来の圧延法による配向度に比べて大幅に改善
されている。Further, when the degree of orientation of the green sheet 13 to which the vertical magnetic field is applied is examined, it is improved to 75 to 85%, which is significantly improved as compared with the degree of orientation by the conventional rolling method.
【００３０】以上のように本実施例によれば、ドクター
ブレード法によりグリーンシート１３を形成する際に、
該シート面に電磁石１０，１１により垂直磁界を印加し
たので、磁気配向度を大幅に向上でき、上述のように残
留磁束密度，保磁力，及びＢＨ積エネルギー等の優れた
磁気特性を得ることができ、高性能化の要請に対応でき
る。As described above, according to this embodiment, when the green sheet 13 is formed by the doctor blade method,
Since a perpendicular magnetic field is applied to the sheet surface by the electromagnets 10 and 11, the degree of magnetic orientation can be significantly improved, and excellent magnetic characteristics such as residual magnetic flux density, coercive force, and BH product energy can be obtained as described above. It is possible to meet the demand for higher performance.
【００３１】また本実施例では、上記磁性体シート２を
積層した後一体焼結して焼結体１´を形成したので、該
シート２の積層数を設定することにより厚さ１００μm
〜数ｍｍの永久磁石１を容易に形成でき、磁気特性の向
上を図りながら薄肉化に対応できる。さらに従来の研磨
加工を不要にできることから、それだけコストを低減で
きる。Further, in this embodiment, since the magnetic sheets 2 are laminated and then integrally sintered to form a sintered body 1 ', a thickness of 100 .mu.m is set by setting the number of laminated sheets 2.
It is possible to easily form the permanent magnet 1 having a thickness of up to several mm, and it is possible to reduce the thickness while improving the magnetic characteristics. Further, since the conventional polishing process can be eliminated, the cost can be reduced accordingly.
【００３２】なお、上記実施例では、第１，第２電磁石
１０，１１により垂直磁界を２段階で印加した場合を例
にとって説明したが、本発明は何れか一方の電磁石で磁
界を印加してもよく、この場合においても配向度を向上
できる。ちなみに、一方のみで印加した場合は、６５〜
７５％の配向度が得られ、従来の圧延成形法に比べて
１．５倍程度向上できる。In the above embodiment, the case where the vertical magnetic field is applied in two steps by the first and second electromagnets 10 and 11 has been described as an example, but the present invention applies the magnetic field by either one of the electromagnets. Also, in this case, the degree of orientation can be improved. By the way, if only one is applied,
A degree of orientation of 75% is obtained, which can be improved by about 1.5 times as compared with the conventional roll forming method.
【００３３】また、上記実施例では、サーキュレータ，
アイソレータに採用される異方性永久磁石を例にとって
説明したが、本発明はこれに限られるものではなく、他
の磁性部品にも勿論適用できる。In the above embodiment, the circulator,
Although the anisotropic permanent magnet used for the isolator has been described as an example, the present invention is not limited to this, and can of course be applied to other magnetic parts.
【００３４】[0034]
【発明の効果】以上のように請求項１の発明に係る異方
性永久磁石によれば、磁性体シートに垂直磁界を印加
し、該磁性体シートを積層するとともに一体焼結してな
る焼結体により構成し、また請求項２の発明では、スラ
リーから磁性体シートを成形する際に該シート面に対し
て垂直方向に磁界を印加し、該磁性体シートを積層して
圧着成形した後一体焼成して焼結体を製造したので、残
留磁束密度，保磁力，ＢＨ積エネルギー等における磁気
特性の高性能化を図りながら、コストを上昇させること
なく小型，薄型化に対応できる効果がある。As described above, according to the anisotropic permanent magnet of the first aspect of the present invention, a vertical magnetic field is applied to the magnetic sheets, the magnetic sheets are laminated and sintered together. According to the invention of claim 2, when a magnetic sheet is formed from the slurry, a magnetic field is applied in a direction perpendicular to the sheet surface, and the magnetic sheets are laminated and pressure-bonded. Since the sintered body is manufactured by being integrally fired, there is an effect that it is possible to reduce the size and thickness without increasing the cost while improving the magnetic characteristics such as the residual magnetic flux density, the coercive force, and the BH product energy. .
【００３５】さらに請求項３の発明では、焼結体の厚さ
を磁性体シートの積層数で設定したので、焼結体の厚さ
を容易に制御でき、研磨加工を不要にしてコストを低減
できる効果がある。Further, according to the third aspect of the invention, since the thickness of the sintered body is set by the number of laminated magnetic sheets, the thickness of the sintered body can be easily controlled, and the polishing process is unnecessary to reduce the cost. There is an effect that can be done.
【図１】請求項１〜３の発明に係る一実施例による異方
性永久磁石の製造装置を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an anisotropic permanent magnet manufacturing apparatus according to an embodiment of the present invention.
【図２】上記実施例の製造工程を示す分解斜視図であ
る。FIG. 2 is an exploded perspective view showing a manufacturing process of the above embodiment.
【図３】上記実施例の異方性永久磁石を示す斜視図であ
る。FIG. 3 is a perspective view showing an anisotropic permanent magnet of the above embodiment.
１ 異方性永久磁石 １´ 焼結体 ２，１３ 磁性体シート １４ スラリー 1 Anisotropic Permanent Magnet 1'Sintered Body 2,13 Magnetic Sheet 14 Slurry
Claims (3)
価の金属）で表されるマグネトプランバイト型六方晶系
の結晶構造からなる異方性永久磁石において、該永久磁
石が、上記化学式からなる磁性体シートに該シート面に
対して垂直磁界を印加し、該磁性体シートを積層すると
ともに一体焼結してなる焼結体により構成されているこ
とを特徴とする異方性永久磁石。1. The chemical formula MeO.6Fe 2 O 3 (Me is 2
An anisotropic permanent magnet having a magnetoplumbite-type hexagonal crystal structure represented by a (valent metal), the permanent magnet applying a magnetic field perpendicular to the magnetic substance sheet having the above chemical formula to the sheet surface. An anisotropic permanent magnet comprising a sintered body obtained by laminating the magnetic sheets and integrally sintering the sheets.
価の金属）で表されるマグネトプランバイト型六方晶系
の結晶構造からなる異方性永久磁石の製造方法におい
て、上記化学式からなる磁性体粉末とバインダとを混練
してスラリーを形成する工程と、該スラリーから磁性体
シートを成形する際に該シート面に対して垂直方向に磁
界を印加する工程と、該磁性体シートを積層して圧着成
形した後一体焼成し、これにより上記積層方向に磁化容
易軸を持つ焼結体を得る工程とを備えたことを特徴とす
る異方性永久磁石の製造方法。2. The chemical formula MeO.6Fe 2 O 3 (Me is 2
In the method for producing an anisotropic permanent magnet having a magnetoplumbite-type hexagonal crystal structure represented by a (valent metal), a step of kneading a magnetic powder having the above chemical formula and a binder to form a slurry, A step of applying a magnetic field in a direction perpendicular to the surface of the magnetic sheet when the magnetic sheet is formed from the slurry; And a step of obtaining a sintered body having an axis of easy magnetization.
厚さが、磁性体シートの積層数により設定されているこ
とを特徴とする異方性永久磁石及びその製造方法。3. The anisotropic permanent magnet according to claim 1 or 2, wherein the thickness of the sintered body is set by the number of laminated magnetic sheets, and a method for manufacturing the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6141966A JPH088111A (en) | 1994-06-23 | 1994-06-23 | Anisotropic permanent magnet and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6141966A JPH088111A (en) | 1994-06-23 | 1994-06-23 | Anisotropic permanent magnet and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH088111A true JPH088111A (en) | 1996-01-12 |
Family
ID=15304274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6141966A Pending JPH088111A (en) | 1994-06-23 | 1994-06-23 | Anisotropic permanent magnet and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH088111A (en) |
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