JPH0677023A - Manufacture of anisotropic magnetic powder - Google Patents
Manufacture of anisotropic magnetic powderInfo
- Publication number
- JPH0677023A JPH0677023A JP4229935A JP22993592A JPH0677023A JP H0677023 A JPH0677023 A JP H0677023A JP 4229935 A JP4229935 A JP 4229935A JP 22993592 A JP22993592 A JP 22993592A JP H0677023 A JPH0677023 A JP H0677023A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- magnetic
- particles
- amorphous
- anisotropic
- 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.)
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- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は異方性磁性粉末の製造方
法に係り、特に母粒子と該母粒子の周囲を覆う子粒子と
からなるカプセル粒子を使用した異方性磁性粉末の製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an anisotropic magnetic powder, and more particularly to a method for producing an anisotropic magnetic powder using capsule particles composed of mother particles and child particles surrounding the mother particles. Regarding
【０００２】[0002]
【従来の技術】一般に、異方性磁石は、所要の原料粉を
混合し、これを所定の型内に充填して加圧し所望の形状
に圧粉成形した後、この成形体を真空又はＡｒ等の不活
性ガス雰囲気に置換した焼結炉内で上記原料粉の融点以
下の温度で焼成固化することにより製造していた。2. Description of the Related Art Generally, in an anisotropic magnet, required raw material powders are mixed, filled in a predetermined mold and pressed to form a desired shape. It was manufactured by firing and solidifying at a temperature equal to or lower than the melting point of the raw material powder in a sintering furnace replaced with an inert gas atmosphere such as.
【０００３】この異方性磁石の製造に関連する技術とし
ては、特開昭５５−８０３０２号公報や、特開平１−１
３５００３号公報などに提案されている技術がある。Techniques related to the production of this anisotropic magnet are disclosed in JP-A-55-80302 and JP-A-1-1.
There is a technique proposed in Japanese Patent No. 35003.
【０００４】前者の特開昭５５−８０３０２号公報に開
示されている技術は、「非晶質磁性合金を所望の圧下率
で低温間圧延して圧延方向にほぼ直角な方向に磁化容易
軸を有し所望の大きさの磁気異方性を付与すること」を
要旨とする非晶質磁性合金の磁気特性の改質方法であ
る。The former technique disclosed in Japanese Patent Application Laid-Open No. 55-80302 is described as follows: "Amorphous magnetic alloy is rolled at a desired reduction ratio at a low temperature and an easy axis of magnetization is formed in a direction substantially perpendicular to the rolling direction. The present invention is a method of modifying magnetic properties of an amorphous magnetic alloy, which is characterized by "having a desired magnetic anisotropy".
【０００５】また、後者の特開平１−１３５００３号公
報に開示されている技術は、「希土類元素（Ｎｄ，Ｐ
ｒ，Ｃｅ，Ｄｙ等）と鉄（Ｆｅ）を主成分とするアモル
ファスを含む合金を３００℃以上６００℃以下の温度で
０．３〜１０ｔｏｎｆ／ｃｍ2 に加熱処理し、磁気異方
性をもたせたこと」を要旨とする磁気異方性永久磁石の
製造方法である。Further, the latter technique disclosed in Japanese Patent Laid-Open No. 1-135003 describes "rare earth element (Nd, P
r, Ce, Dy, etc.) and an alloy containing an amorphous material containing iron (Fe) as main components at a temperature of 300 ° C. or higher and 600 ° C. or lower to 0.3 to 10 tonf / cm 2 to have magnetic anisotropy. It is a method of manufacturing a magnetic anisotropic permanent magnet.
【０００６】[0006]
【発明が解決しようとする課題】ところで、従来の技術
にあっては、粉末による異方性磁石の成形固化方法に視
点を置いたものであって、粉末自体の製造方法について
はあまり論じられていなかった。従って、成形固化時に
異方性処理を行なわなければならず、成形固化工程が複
雑になるという問題があった。また、材料の多様化した
今日においては、異方性磁性を有する粉末に視点を置い
た技術開発も必要である。By the way, the prior art is focused on a method of molding and solidifying an anisotropic magnet using powder, and a method of manufacturing the powder itself has been much discussed. There wasn't. Therefore, there has been a problem that an anisotropic treatment must be carried out at the time of molding and solidification, which complicates the molding and solidification process. In addition, in today's diversified materials, it is necessary to develop technology focusing on powders having anisotropic magnetism.
【０００７】本発明の目的は、上記課題に鑑み、良好な
異方性磁性を有し、成形固化工程を簡単にすることがで
きる異方性磁性粉末の製造方法を提供することにある。In view of the above problems, an object of the present invention is to provide a method for producing anisotropic magnetic powder having good anisotropic magnetism and capable of simplifying the molding and solidifying process.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成すべく本
発明に係る異方性磁性粉末の製造方法は、等方性のアモ
ルファスを含む非晶質磁性合金粉を母粒子とし、ＣｕＯ
等の非磁性酸化物粉を子粒子とするカプセル粒子を形成
し、このカプセル粒子を加熱しながら加圧処理すると共
に、この加圧処理時に電流を印加して通電処理するよう
にしたものである。In order to achieve the above object, the method for producing anisotropic magnetic powder according to the present invention is such that an amorphous magnetic alloy powder containing isotropic amorphous is used as a mother particle and CuO is used.
Capsule particles having non-magnetic oxide powder such as child particles are formed, and the capsule particles are subjected to a pressure treatment while being heated, and an electric current is applied during the pressure treatment to carry out an energization treatment. .
【０００９】[0009]
【作用】上記構成によれば、等方性のアモルファスを含
む非晶質磁性合金粉を母粒子とし、ＣｕＯ等の非磁性酸
化物粉を子粒子とするカプセル粒子を使用している。ま
た、このカプセル粒子は加熱されながら加圧処理され、
該加圧処理時に電流が印加されて通電処理される。According to the above construction, the capsule particles having the amorphous magnetic alloy powder containing isotropic amorphous as the mother particles and the non-magnetic oxide powder such as CuO as the child particles are used. Also, the capsule particles are pressure-treated while being heated,
An electric current is applied at the time of the pressurizing process to energize the device.
【００１０】従って、使用するアモルファスを含む非晶
質磁性合金粉は等方性であるが、加圧・通電処理により
再結晶化する。具体的には、加圧処理によるずれ応力が
直接の圧力となり、このずれ応力が異方性磁性を有する
粉末を製造できる主因となる。また、上記通電処理を施
すのは、ずれ応力に対して粉末を瞬時に適当な硬さにす
る必要があるからである。Therefore, although the amorphous magnetic alloy powder containing the amorphous material used is isotropic, it is recrystallized by the pressurizing and energizing treatment. Specifically, the shear stress due to the pressurizing process becomes a direct pressure, and this shear stress is the main reason for manufacturing the powder having anisotropic magnetism. The above-mentioned energization treatment is performed because it is necessary to instantly make the powder have an appropriate hardness against the shear stress.
【００１１】このようにして加圧処理方向に異方性を有
する磁性粉末を製造することができるものである。In this way, a magnetic powder having anisotropy in the pressure treatment direction can be manufactured.
【００１２】[0012]
【実施例】以下、本発明に係る異方性磁性粉末の製造方
法の好適一実施例を添付図面に基づいて詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method for producing anisotropic magnetic powder according to the present invention will be described in detail below with reference to the accompanying drawings.
【００１３】図１及び図２は、本実施例の異方性磁性粉
末の製造方法を示す概略図である。まず図１に示すよう
に、等方性のアモルファスを含む非晶質磁性合金粉を母
粒子１とし、非磁性酸化物粉を子粒子２とするカプセル
粒子３を形成する。このカプセル状態とは、周知の蒸
着，スパッタリング，ハイブリタイゼーション，ディピ
ング等を使用して、母粒子１の周囲を子粒子２で覆うも
のである。このようにカプセル状態にするには、母粒子
１の直径に対して子粒子２の直径を、例えば、十分の一
から二十分の一程度に小さく設定することが望ましい。
上記非晶質磁性合金粉には、例えば、非晶質磁性材料に
単ロール急冷法を用いて製造された急冷凝固系Ｎｄ−Ｆ
ｅ−Ｂ磁性粉を用いる。この急冷凝固系磁性粉には、ア
モルファス磁性粉も含むものである。このアモルファス
も含むとは、急冷凝固系合金の微結晶はその列的規則性
が急冷によって準安定になっているので、材料組成によ
って非晶質になっているものも含む趣旨である。また、
上記非晶質磁性合金粉は強磁性を有しており、軟磁性で
はない。1 and 2 are schematic views showing a method of manufacturing the anisotropic magnetic powder of this embodiment. First, as shown in FIG. 1, capsule particles 3 having an amorphous magnetic alloy powder containing isotropic amorphous as a mother particle 1 and a non-magnetic oxide powder as a child particle 2 are formed. In this capsule state, the mother particles 1 are covered with the child particles 2 by using known vapor deposition, sputtering, hybridization, dipping and the like. In order to make the capsule state as described above, it is desirable to set the diameter of the child particles 2 to be smaller than the diameter of the mother particles 1 to, for example, about 1/10 to 20/10.
The amorphous magnetic alloy powder may be, for example, a rapidly solidified Nd-F produced by using a single roll rapid cooling method for an amorphous magnetic material.
e-B magnetic powder is used. The rapidly solidified magnetic powder also includes amorphous magnetic powder. The phrase "including amorphous" is meant to include amorphous crystals depending on the material composition, because the columnar regularity of the crystallites of the rapidly solidified alloy is metastable due to rapid cooling. Also,
The amorphous magnetic alloy powder has ferromagnetism and is not soft magnetic.
【００１４】一方、非磁性酸化物粉にはＣｕＯ等を使用
し、上記非晶質磁性合金粉に対して０．０１〜５重量％
の割合になるようにする。On the other hand, CuO or the like is used as the non-magnetic oxide powder, and 0.01 to 5% by weight based on the above amorphous magnetic alloy powder.
The ratio of.
【００１５】次に、図２に示すように、上記カプセル粒
子３を加圧手段として双ローラ加圧装置４を使用して加
圧処理する。このとき、上記双ローラ加圧装置４の双ロ
ーラ５ａ，５ｂをこれに内臓した内部ヒータ６で加熱
し、２００℃以上５００℃以下に保持しておく。双ロー
ラ５ａ，５ｂの押付力は一方のローラ５ａに具備された
ロードセル７を用いて管理する。また、双ローラ５ａ，
５ｂの間隙は上記カプセル粒子３の母粒子１の短径をｄ
とした場合、２／３ｄ以下に設定する。Next, as shown in FIG. 2, the capsule particles 3 are pressure-treated by using a twin roller pressure device 4 as a pressure means. At this time, the twin rollers 5a and 5b of the twin roller pressing device 4 are heated by the internal heater 6 incorporated therein and kept at 200 ° C. or higher and 500 ° C. or lower. The pressing force of the twin rollers 5a and 5b is controlled by using the load cell 7 provided on one roller 5a. Also, twin rollers 5a,
The gap 5b is defined by the minor axis of the mother particle 1 of the capsule particle 3 d.
In this case, set to 2 / 3d or less.
【００１６】そして、双ローラ５ａ，５ｂの押付力を５
ｋｇ以上に設定して、当該双ローラ５ａ，５ｂの間に上
記カプセル粒子３を通過させる。このカプセル粒子３の
通過時に、双ローラ５ａ，５ｂ間に通電機構８によりパ
ルス及び交直流を印加し、該カプセル粒子３を通電処理
（放電を含む）する。この通電条件は電源容量に起因す
るが、例えば、３００Ａ／ｃｍ2 〜１５００Ａ／ｃｍ2
とする。Then, the pressing force of the twin rollers 5a and 5b is set to 5
The capsule particles 3 are allowed to pass between the twin rollers 5a and 5b by setting the pressure to be not less than kg. When the capsule particles 3 pass, a pulse and an alternating current are applied between the twin rollers 5a and 5b by the energizing mechanism 8 to energize the capsule particles 3 (including discharge). This energization condition depends on the power capacity, but is, for example, 300 A / cm 2 to 1500 A / cm 2.
And
【００１７】このようにして製造された異方性磁性粉末
は、磁場中にて４５０℃〜８５０℃で焼結固化される
か、或いはプラスチックと混合して磁場中にて所望の形
状に成形されるものである。The anisotropic magnetic powder thus produced is sintered and solidified in a magnetic field at 450 ° C. to 850 ° C., or is mixed with plastic and molded into a desired shape in a magnetic field. It is something.
【００１８】次に、上記実施例における作用を述べる。Next, the operation of the above embodiment will be described.
【００１９】上述したように、本実施例の異方性磁性粉
末の製造方法は、アモルファスを含む非晶質磁性合金粉
を母粒子１とし、ＣｕＯ等の非磁性酸化物粉を子粒子２
とするカプセル粒子３を使用している。また、このカプ
セル粒子３は上記双ローラ加圧装置４の双ローラ５ａ，
５ｂにより加熱されながら加圧処理され、カプセル粒子
３の双ローラ５ａ，５ｂ通過時に上記通電機構８により
パルス及び交直流が印加されて通電処理される。As described above, according to the method for producing anisotropic magnetic powder of this embodiment, the amorphous magnetic alloy powder containing amorphous is used as the mother particle 1, and the non-magnetic oxide powder such as CuO is used as the child particle 2.
Capsule particles 3 are used. In addition, the capsule particles 3 are the twin rollers 5a of the twin roller pressing device 4,
While being heated by 5b, pressure treatment is performed, and when the capsule particles 3 pass through the twin rollers 5a and 5b, a pulse and an alternating direct current are applied by the energizing mechanism 8 to perform energization treatment.
【００２０】従って、使用するアモルファスを含む非晶
質磁性合金粉は等方性であるが、上記双ローラ５ａ，５
ｂの回転方向にロール加圧し通電処理により再結晶化す
る。具体的には、双ローラ５ａ，５ｂによるずれ応力が
直接の圧力となり、このずれ応力が異方性磁性を有する
粉末を製造できる主因となる。また、上記通電処理を施
すのは、ずれ応力に対して粉末を瞬時に適当な硬さにす
る必要があるからである。Therefore, although the amorphous magnetic alloy powder containing amorphous used is isotropic, the twin rollers 5a, 5
The roll is pressurized in the rotation direction of b and recrystallized by energization. Specifically, the shear stress caused by the twin rollers 5a and 5b is a direct pressure, and this shear stress is a main factor for producing the powder having anisotropic magnetism. The above-mentioned energization treatment is performed because it is necessary to instantly make the powder have an appropriate hardness against the shear stress.
【００２１】このようにして上記双ローラ５ａ，５ｂの
回転方向に異方性を有する磁性粉末を製造することがで
き、本発明の異方性磁性粉末の製造方法によれば、（Ｂ
・Ｈ）ｍａｘ１０であった最大エネルギ積を（Ｂ・Ｈ）
ｍａｘ１３〜３５のクリアランスにおいて異方性に対す
る制御性を持つことができる。Thus, the magnetic powder having anisotropy in the rotating direction of the twin rollers 5a and 5b can be manufactured. According to the method for manufacturing anisotropic magnetic powder of the present invention, (B
・ H) The maximum energy product that was max10 is (B ・ H)
Anisotropy can be controlled in the clearance of max 13 to 35.
【００２２】すなわち、粉末の成形固化時に異方性磁性
を持たせるのではなく、粉末自体が異方性磁性を有する
ので、成形固化工程が簡単なものとなる。また、断熱圧
縮を呈するので、成形体の熱処理は殆ど必要ない。That is, since the powder itself has anisotropic magnetism, not the anisotropic magnetism when the powder is molded and solidified, the molding and solidification process is simplified. Further, since it exhibits adiabatic compression, heat treatment of the molded body is almost unnecessary.
【００２３】尚、加圧手段は必ずしも双ローラ加圧装置
４である必要はなく、加圧部のクリアランスが一定に設
定され、且つカプセル粒子３が通過する相対速度が２０
μｍ／ｍｉｎ〜１０μｍ／ｍｉｎに設定され、上述のよ
うな通電機構８を有していれば良い。The pressurizing means does not necessarily have to be the twin roller pressurizing device 4, the clearance of the pressurizing part is set to be constant, and the relative speed at which the capsule particles 3 pass is 20.
It suffices that it is set to 10 μm / min to 10 μm / min and that it has the energizing mechanism 8 as described above.
【００２４】[0024]
【発明の効果】以上述べたように、本発明に係る異方性
磁性粉末の製造方法によれば、良好な異方性磁性を有
し、成形固化工程を簡単にすることができるという優れ
た効果を発揮する。As described above, the method for producing anisotropic magnetic powder according to the present invention is excellent in that it has good anisotropic magnetism and the molding and solidifying process can be simplified. Be effective.
【図１】本発明に係る異方性磁性粉末の製造方法の一実
施例における母粒子と子粒子とのカプセル状態を示す概
略図である。FIG. 1 is a schematic view showing a capsule state of mother particles and child particles in an example of the method for producing anisotropic magnetic powder according to the present invention.
【図２】本発明に係る異方性磁性粉末の製造方法の一実
施例における加圧・通電処理工程を示す概略図である。FIG. 2 is a schematic view showing a pressurizing / energizing treatment step in one embodiment of the method for producing anisotropic magnetic powder according to the present invention.
１ 母粒子 ２ 子粒子 ３ カプセル粒子 1 Mother particle 2 Child particle 3 Capsule particle
フロントページの続き (72)発明者 奥村 英二 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 加藤 雅之 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 松見 裕 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内Front page continuation (72) Eiji Okumura Eiji Okumura, 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Institute (72) Inventor, Masayuki Kato, 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Institute (72) ) Inventor Hiroshi Matsumi 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Institute
Claims (2)
母粒子とし、非磁性酸化物粉を子粒子とするカプセル粒
子を形成し、該カプセル粒子を加熱しながら加圧処理す
ると共に、該加圧処理時に電流を印加して通電処理する
ようにしたことを特徴とする異方性磁性粉末の製造方
法。1. A capsule particle having amorphous magnetic alloy powder containing amorphous as a mother particle and non-magnetic oxide powder as a child particle is formed, and the capsule particle is subjected to pressure treatment while being heated, A method for producing anisotropic magnetic powder, characterized in that an electric current is applied during the pressure treatment to carry out an electric current treatment.
求項１に記載の異方性磁性粉末の製造方法。2. The method for producing anisotropic magnetic powder according to claim 1, wherein the non-magnetic oxide powder is CuO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04229935A JP3120585B2 (en) | 1992-08-28 | 1992-08-28 | Method for producing anisotropic magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04229935A JP3120585B2 (en) | 1992-08-28 | 1992-08-28 | Method for producing anisotropic magnetic powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0677023A true JPH0677023A (en) | 1994-03-18 |
| JP3120585B2 JP3120585B2 (en) | 2000-12-25 |
Family
ID=16900035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04229935A Expired - Fee Related JP3120585B2 (en) | 1992-08-28 | 1992-08-28 | Method for producing anisotropic magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3120585B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016146388A (en) * | 2015-02-06 | 2016-08-12 | Tdk株式会社 | Iron nitride magnetic powder and bond magnet including same |
| JP2016146387A (en) * | 2015-02-06 | 2016-08-12 | Tdk株式会社 | Iron nitride magnet |
-
1992
- 1992-08-28 JP JP04229935A patent/JP3120585B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016146388A (en) * | 2015-02-06 | 2016-08-12 | Tdk株式会社 | Iron nitride magnetic powder and bond magnet including same |
| JP2016146387A (en) * | 2015-02-06 | 2016-08-12 | Tdk株式会社 | Iron nitride magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3120585B2 (en) | 2000-12-25 |
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