JPS62274002A - Rare earth element-iron-boron type magnetic powder and its production - Google Patents
Rare earth element-iron-boron type magnetic powder and its productionInfo
- Publication number
- JPS62274002A JPS62274002A JP61114765A JP11476586A JPS62274002A JP S62274002 A JPS62274002 A JP S62274002A JP 61114765 A JP61114765 A JP 61114765A JP 11476586 A JP11476586 A JP 11476586A JP S62274002 A JPS62274002 A JP S62274002A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- iron
- rare earth
- magnetic powder
- boron
- 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
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 24
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 21
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 150000002910 rare earth metals Chemical class 0.000 title abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000010298 pulverizing process Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 description 21
- 238000000034 method Methods 0.000 description 21
- 239000000843 powder Substances 0.000 description 21
- 239000004033 plastic Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052779 Neodymium Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910000521 B alloy Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- -1 metalloid metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は希土類−鉄−ホウ素系磁石用合金粉末及びその
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a rare earth-iron-boron alloy powder for magnets and a method for producing the same.
現在良く知られている希土類−鉄−ホウ素系磁石は、原
料金属元素を所定の配合で高周波溶解してインゴットを
つくり、これをジョウクラツンヤーやブラウンミルで粗
粉砕し、次いでジェットミル、ボールミル等で微粉砕し
、磁場中で配向プレス成形した後、焼結し、時効処理す
ることにより製作される。Currently well-known rare earth-iron-boron magnets are produced by high-frequency melting of raw metal elements in a predetermined composition to create an ingot, which is coarsely ground in a Jokura Tsunya or Brown mill, then jet milled or ball milled. It is manufactured by pulverizing it finely, oriented press forming in a magnetic field, sintering it, and subjecting it to aging treatment.
しかし、このような焼結磁石は硬くてもろいために複雑
な形状の加工が困難であり、精密な加工度が要求される
場合にはコスト高となる。そこで、加工性を上げるため
に粉末磁石とプラスチック材料の混合物より成るプラス
チックまたはゴム磁石が用いられている。However, since such sintered magnets are hard and brittle, it is difficult to process them into complex shapes, and when precision processing is required, the cost becomes high. Therefore, in order to improve workability, plastic or rubber magnets made of a mixture of powdered magnets and plastic materials are used.
希土類−鉄−ホウ素系のプラスチック磁石は。Rare earth-iron-boron based plastic magnets.
高速急冷法で作られた磁石リボンを粉砕、熱処理し、プ
ラスチックで成形することにより製作される。しかしこ
の磁石は異方性化が困難であり等方性であるために焼結
磁石に比べて磁気特性がはるかに劣る。It is manufactured by crushing magnetic ribbons made using a high-speed quenching method, heat-treating them, and molding them with plastic. However, since it is difficult to make this magnet anisotropic and it is isotropic, its magnetic properties are far inferior to that of sintered magnets.
また、高速急冷法を用いずに、焼結法で製作された希土
類−鉄−ホウ素系磁石を粉砕機で粉砕した粉末を用いる
方法も公知であるが、この系の磁石は粉砕すると粒界層
が乱れ、保磁力が著しく低下する。粉砕後熱処理を施す
ことによりＩＨｃを回復でさるが、！−Ｈカーブの角型
が悪く、焼結体で（ＢＨ）ｗａｘ ＝３５ＭＧＯｅのも
のが粉末の状態−ｃ’ （ＢＨ） ｍａｔは２２ＭＧＯ
ｅ以下に低下する。Another known method is to use powder obtained by pulverizing rare earth-iron-boron magnets produced by sintering using a pulverizer, without using the high-speed quenching method. is disturbed, and the coercive force decreases significantly. IHc can be recovered by heat treatment after crushing, but! -The square shape of the H curve is poor, and the sintered body (BH) wax = 35MGOe is in a powder state -c' (BH) mat is 22MGO
It decreases to below e.
従って、（ＢＨ）ｗａｘの低下しない希土類−鉄一ホウ
素系磁石粉末及びその製造方法の開発が望まれるが、現
在のところ特性の良い磁石粉末は提供されていない。Therefore, it is desired to develop a rare earth-iron-boron-based magnet powder that does not reduce (BH) wax and a method for producing the same, but a magnet powder with good characteristics has not been provided at present.
本発明は特性の良い希土類−鉄一ホウ素系磁石粉末及び
その製造方法を提供することを目的とする。An object of the present invention is to provide a rare earth-iron-boron magnet powder with good characteristics and a method for producing the same.
本発明の磁性粉末は、希土類元素、鉄及びホウ素より成
り、鱗片状の粒子形を有し、平均厚さが０．０５ｍ−以
下で長さ／厚さの比が５ ／ １以上である磁石特性の
すぐれた磁性粉末である。The magnetic powder of the present invention is made of rare earth elements, iron and boron, has a scale-like particle shape, has an average thickness of 0.05 m or less, and has a length/thickness ratio of 5/1 or more. A magnetic powder with excellent properties.
この磁性粉末は希土類−鉄一ホウ素焼結磁石を真空中に
入れ１表面後着ガスを除去し、次いでＨ２ガスを導入し
て焼結磁石にＨ２ガスを吸蔵させて静ごし、必要があれ
ば吸蔵されたＨ２ガスを除去することにより製造しうる
。This magnetic powder is prepared by placing a rare earth-iron-boron sintered magnet in a vacuum to remove gas deposited on the surface, then introducing H2 gas to make the sintered magnet absorb H2 gas and allowing it to settle. For example, it can be produced by removing occluded H2 gas.
本発明による磁性粉末は、ゴム磁石やプラスチック磁石
の製造に好適であり、熱処理すれば（ＢＨ）ｗａｘが２
２ＭＧＯｅ以上の特性を有し、しかも形状が鱗片状であ
るため磁場配向性が高く、すぐれた特性の異方性プラス
チック磁石を得ることができる。The magnetic powder according to the present invention is suitable for manufacturing rubber magnets and plastic magnets, and when heat-treated, the (BH) wax can be reduced to 2.
It has characteristics of 2MGOe or more, and since it has a scale-like shape, it has high magnetic field orientation, and an anisotropic plastic magnet with excellent characteristics can be obtained.
本発明は希土類−鉄−ホウ素形磁石をＨ２ガスを用いて
粉砕した粉末及びこのような粉砕方法を特徴とする。と
ころで成る種の金属及び合金がＨ２を多量に吸蔵し、放
出することは良く知られており、Ｈ２の吸蔵の際に金属
や合金の脆化が生じることも知られている。しかしなが
ら、この現象をプラスチック磁石用の磁性粉末の製造工
程へ応用でさることは何人も発見しておらず、本発明者
の研究によって初めて明らかとなったものである。もつ
とも、希土類−鉄−ホウ素系焼結磁石にＨ２吸蔵による
粉砕工程を用いた例は知られているが（特開昭８０−８
３１４号、 Ｇｏ−１１９７０１号）、これは焼結型磁
石のための原料磁性粉を得る工程に用いられたもので、
特性の良いプラスチック磁石用粉末の製造とは関係がな
い０本発明はＨ２吸蔵による粉砕がプラスチック磁石に
必要な磁性粉の要件、すなわち粒子形、配向性、ｉｌ！
気特性を満足させることを見出したために成立し得たの
である。The present invention features a powder obtained by pulverizing a rare earth-iron-boron magnet using H2 gas, and a method for pulverizing the same. It is well known that certain metals and alloys store and release large amounts of H2, and it is also known that embrittlement of metals and alloys occurs when H2 is stored. However, no one has discovered that this phenomenon can be applied to the manufacturing process of magnetic powder for plastic magnets, and this phenomenon was first discovered through research by the present inventor. However, there are known examples in which a pulverization process using H2 absorption is applied to rare earth-iron-boron based sintered magnets (Japanese Unexamined Patent Application Publication No. 80-808).
No. 314, Go-119701), which was used in the process of obtaining raw material magnetic powder for sintered magnets.
The present invention is not related to the production of powder for plastic magnets with good characteristics.The present invention is based on the requirements of magnetic powder necessary for plastic magnets, such as particle shape, orientation, il!
This was possible because it was discovered that it satisfies the physical characteristics.
上記特開昭８０−８３３０４号等の方法では粉砕の困難
な希土類−鉄一ホウ素系の合金に焼結前の成形性を与え
るために粗粉を得るのに利用されたに過ぎず１本発明の
ようにそれ自体で配向性の良い小鱗片状であり、（ＢＨ
）ｓ＋ａｍの大きい、プラスチック磁石に適した粉末を
得ることを示唆しない。The method disclosed in JP-A No. 80-83304 was only used to obtain coarse powder to give formability before sintering to rare earth-iron-boron alloys, which are difficult to crush. It is in the form of small scales with good orientation like (BH
) does not suggest obtaining a powder suitable for plastic magnets with a large s+am.
第１図は本発明の磁性粉末を得る方法の１例を示す工程
図であり、第１段階は焼結磁石製造工程であり、これは
本発明の特徴とは無関係の前段工程である。第２段階は
本発明によるプラスチック磁石用粉末の製造工程を示し
、第３段階はプラスチック磁石を作る応用工程を示す。FIG. 1 is a process diagram showing one example of the method for obtaining the magnetic powder of the present invention, and the first step is a sintered magnet manufacturing process, which is a preliminary step that is unrelated to the features of the present invention. The second stage shows the manufacturing process of the powder for plastic magnets according to the present invention, and the third stage shows the applied process of making plastic magnets.
第１段階は希土類−鉄一ホウ素系原料、例えばＮｄ、Ｆ
ｅ、Ｂの所定割合に混合しく工程ｌ）。The first stage is rare earth-iron-boron based raw materials, such as Nd, F.
Step 1) of mixing e and B in a predetermined ratio.
高温で溶解してインゴットを作り（工程２）、これをシ
ョークラッシャー、ブラウンミル等で粗粉砕しく工程３
）１次いでジェットミル、ボールミル等で微粉砕しく工
程４）、磁場中で塊状に成形しく工程５）、高温焼結及
び時効処理しく工程６）、焼結体を得る。このものは磁
気異方性を有する。高特性の焼結磁石である。上記は１
例であり１本発明の方法は他の方法によって製造された
希土類−鉄一ホウ素磁石にも適用できる。Melt at high temperature to make an ingot (Step 2), and coarsely crush this using a show crusher, brown mill, etc. Step 3
) 1) Next, step 4) is finely pulverized using a jet mill, ball mill, etc., step 5) is formed into a lump in a magnetic field, and step 6) is sintered at high temperature and subjected to aging treatment to obtain a sintered body. This material has magnetic anisotropy. It is a sintered magnet with high characteristics. The above is 1
By way of example, the method of the present invention is also applicable to rare earth-iron-boron magnets made by other methods.
第２段階は本発明の方法により本発明の磁性粉末を製造
する工程を示す、すなわち、先ず、塊状の希土類−鉄−
ホウ素系磁石をＨ２吸蔵粉砕法により粉砕しく工程８）
、次いで熱処理する（工程９）。The second step shows the process of manufacturing the magnetic powder of the present invention by the method of the present invention, that is, first, the bulk rare earth-iron
Step 8) Grinding the boron-based magnet using the H2 storage grinding method
, followed by heat treatment (step 9).
このＨ２は吸蔵による粉砕は、上記塊状磁石を密閉容器
に装入して排気して磁石表面に軟着された空気その他の
ガスを十分に除去する０次いで。This H2 occlusion pulverization is carried out by placing the block magnet in a closed container and evacuating it to sufficiently remove air and other gases that have adhered to the surface of the magnet.
密閉容器内にＨ２ガスを導入する。磁石は大量のＨ２ガ
スを吸蔵しながら鱗片状に剥離しながら磁石の内部へ浸
透する。数分以上数時間のＨ２処理が終わったら１周囲
の水素ガスをＡｒガス等の不活性ガスで置換し、それと
同時に、または置換が成る程度進んだら昇温を初め、吸
蔵ガスの放出に適する温度、例えば３００℃にし、Ａｒ
ガスを断って真空引きをする。これで粉砕工程が終わる
。Introduce H2 gas into the sealed container. The magnet absorbs a large amount of H2 gas and peels off into scales as it penetrates into the inside of the magnet. After completing the H2 treatment for several minutes to several hours, replace the surrounding hydrogen gas with an inert gas such as Ar gas, and at the same time, or once the replacement has progressed to the extent that it is possible, start raising the temperature to a temperature suitable for releasing the occluded gas. , for example, at 300°C and Ar
Turn off the gas and draw a vacuum. This completes the crushing process.
次いで、Ａｒガス等の不活性カスを密閉容器内に導入し
、高温度例えば９００°Ｃに加熱して熱処理を行ない良
好な磁石特性を付加する１次いで室温に冷却すると本発
明のプラスチック磁石用の磁性粉末が得られる。Next, inert gas such as Ar gas is introduced into a sealed container and heat-treated at a high temperature, for example, 900°C, to impart good magnetic properties. A magnetic powder is obtained.
このようにして得られた磁性粉末は１機械粉砕によるも
の（第１図工程８′）よりもはるかに特性が良い、この
点は後で比較例として示す０本発明の磁性粉末は鱗片状
であり、平均の厚さが５０給以下である。また平均の最
大幅／厚ざ比は約５／１以上である０本発明の磁性粉末
は磁界により容易に配向しうる。従って、ゴム、プラス
チック等の適当なバインダーと本発明の磁性粉を混合し
、次いで磁場中成形（第１図工程１０）をすると、粉砕
中に機械歪が入らないために磁気特性が良く、（ＢＨ）
ｗａｘの大きな、異方性プラスチック磁石を得ることが
できる。The magnetic powder obtained in this way has much better properties than that obtained by mechanical pulverization (Step 8' in Figure 1).This point will be shown later as a comparative example.The magnetic powder of the present invention has a scaly shape. The average thickness is less than 50 mm. Further, the magnetic powder of the present invention having an average maximum width/thickness ratio of about 5/1 or more can be easily oriented by a magnetic field. Therefore, if the magnetic powder of the present invention is mixed with a suitable binder such as rubber or plastic and then molded in a magnetic field (step 10 in Figure 1), the magnetic properties are good because no mechanical strain occurs during crushing. BH)
Anisotropic plastic magnets with large wax can be obtained.
本発明で使用できる希土類元素は、希土類−鉄−ホウ素
磁石が水素吸蔵性となる限り、いかなる元素でも良く、
Ｎｄ、Ｙ、Ｌａ、Ｃｅ、Ｇｄ、Ｐｒ、Ｓａ等の１種以上
を用いることができる。The rare earth element that can be used in the present invention may be any element as long as the rare earth-iron-boron magnet can absorb hydrogen.
One or more of Nd, Y, La, Ce, Gd, Pr, Sa, etc. can be used.
又、鉄と共に他の遷移金属、例えばＣｏ、Ｎｉ、Ｍｎ等
、ホウ素と共にＳｌ、ＡＩ等の半金属、その他少量の異
種元素を用いることができる。Further, other transition metals such as Co, Ni, Mn, etc. can be used together with iron, metalloid metals such as Sl, AI, etc. can be used together with boron, and other small amounts of different elements can be used.
より具体的に本発明の水素粉砕工程を述へるに、密閉容
器の排気はＩＱ→〜１ｏ弓Ｔｏｒｒ程度まで行い、容器
を排気源から遮断し、Ｈ２ガスを導入して数Ｔｏｒｒ〜
数十気圧にし、数分ないし数時間、例えば１時間保ち１
周囲のＨ２ガスをＡｒガスで掃気し、掃気と同時または
遅れて Ｉｏｏ〜５００″Ｃ１例えば３００℃に加熱し
、その温度を保ちなからロータリポンプで１時間排気で
脱水素する。得られた磁性粉末はそのまま、或いは好ま
しくは６０メツシ二などのふるいでふるって大径の粒子
を除去した上プラスチックに混合し、成形してプラスチ
ック磁石とする。上記のＨ２粉砕工程によって得られた
粉末は磁気特性を好ましい範囲にするのにちょうど適し
た寸法及び形状を有するから、微粉砕は必要がなく、ふ
るい分は程度で十分である。To describe the hydrogen pulverization process of the present invention more specifically, the airtight container is evacuated to IQ→~10 Torr, the container is shut off from the exhaust source, and H2 gas is introduced to the extent of several Torr.
Press the pressure to several tens of atmospheres and keep it for several minutes to several hours, for example, 1 hour.
Scavenge the surrounding H2 gas with Ar gas, heat it to Ioo ~ 500''C1, for example, 300°C, either simultaneously with or after the scavenging, and dehydrogenate it by exhausting with a rotary pump for 1 hour while maintaining that temperature.The obtained magnetic The powder can be used as it is, or preferably sieved through a sieve such as 60 mesh to remove large diameter particles, mixed with plastic, and molded into plastic magnets.The powder obtained by the above H2 crushing process has magnetic properties. Since it has just the right size and shape to achieve the desired range, pulverization is not necessary and sieving is sufficient.
以下に本発明の詳細な説明する。The present invention will be explained in detail below.
実施例
Ｎｄ３４ｗｔ％、Ｂ１ｗｔ％及びＦｅ残部より成る焼結
磁石（第１図に関連して説明した第１段階の諸工程で製
造されたもの）を、密閉容器に装入し、約２時間かけて
ＩＩ）’Ｔｏｒｒまで減圧した０次に排気ポンプへの弁
を閉じ、Ｈ２ガス源の弁を開いてＨ２ガスを密閉容器内
に導入し、常温常圧で約１時間保持し、これにより磁石
にＨ２を吸蔵させて粉末化した１次いで、Ｈ２ガス源を
閉じ、Ａｒガス源を密閉容器に接続し弁を開いた。同時
にヒータにより容器内を ３００°Ｃまで徐々に加熱し
た。適当な時点でＡｒガスを断ち、真空引きを上記温度
を保ちながら約１時間続けた０次に、こうして得られた
磁性粉末をＡガス雰囲気を有する炉に装入して９００°
Ｃで約１時間熱処理し、放冷して本発明の磁性粉末を得
た（実施例粉末）。Example A sintered magnet consisting of 34wt% Nd, 1wt% B, and the balance of Fe (manufactured in the steps of the first stage described in connection with FIG. 1) was placed in a closed container and heated for about 2 hours. II) Close the valve to the zero-order exhaust pump whose pressure has been reduced to 'Torr, open the H2 gas source valve to introduce H2 gas into the sealed container, and keep it at room temperature and pressure for about 1 hour. The H2 gas source was then closed, the Ar gas source was connected to the airtight container, and the valve was opened. At the same time, the inside of the container was gradually heated to 300°C using a heater. At an appropriate point, the Ar gas was cut off, and evacuation was continued for about 1 hour while maintaining the above temperature.Next, the magnetic powder thus obtained was charged into a furnace with an A gas atmosphere and heated at 900°.
C for about 1 hour and allowed to cool to obtain a magnetic powder of the present invention (example powder).
比較のため、１８１図において工程８′に示したように
ブラウンミルによる粉砕を行ない、次いで上記と同様な
熱処理を行った（比較例粉末）。For comparison, the powder was ground in a Brown mill as shown in step 8' in Figure 181, and then heat treated in the same manner as above (comparative example powder).
実施例粉末と比較例粉末をＢＯメツシュのふるいでふる
い分けし、顕微鏡により実施例粉末の平均厚さと平均最
大径（長さ）を求めた。これにより平均厚さ約０！０４
＋ａ＋ａ、平均長さ／平均厚さ比が約５／１の鱗片状粒
子であることが分った。一方比較例粉末は不定形の粒子
であった。これらの粉末の磁気特性を下記の表に示した
。The example powder and the comparative example powder were sieved through a BO mesh sieve, and the average thickness and average maximum diameter (length) of the example powder were determined using a microscope. This results in an average thickness of approximately 0!04
+a+a, the average length/average thickness ratio was found to be scaly particles of about 5/1. On the other hand, the comparative powder had irregularly shaped particles. The magnetic properties of these powders are shown in the table below.
以上から分かるように、本発明の方法及び磁性粉末は、
従来の機械粉砕によるものに比べてすぐれた特性のプラ
スチック磁石を提供できる。その理由は、機械粉砕に比
して磁性粉末の歪が少なし１こと、粒子形状が偏平な鱗
片状であるので配向性が良いことなどが考えられる。As can be seen from the above, the method and magnetic powder of the present invention are
It is possible to provide plastic magnets with superior properties compared to those produced by conventional mechanical pulverization. The reason for this is thought to be that the distortion of the magnetic powder is less than that produced by mechanical pulverization1, and that the particle shape is flat and scaly, so it has good orientation.
第１図は本発明の方法を示す流れ図で、一部従来法を併
記した図である。FIG. 1 is a flowchart showing the method of the present invention, with a part of the conventional method also shown.
第１図Figure 1
Claims (2)
状の粒子形を有し、平均厚みが０．０５ｍｍ以下で長さ
／厚さの比が５／１以上である磁性粉末。(1) Magnetic powder containing rare earth elements, iron, and boron as main components, having a scaly particle shape, an average thickness of 0.05 mm or less, and a length/thickness ratio of 5/1 or more.
させて粉砕することより成る鱗片状の粒子形を有する磁
性粉末の製造方法。(2) A method for producing magnetic powder having a scaly particle shape, which comprises occluding H_2 gas in a rare earth-iron-boron sintered magnet and pulverizing it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61114765A JPS62274002A (en) | 1986-05-21 | 1986-05-21 | Rare earth element-iron-boron type magnetic powder and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61114765A JPS62274002A (en) | 1986-05-21 | 1986-05-21 | Rare earth element-iron-boron type magnetic powder and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62274002A true JPS62274002A (en) | 1987-11-28 |
Family
ID=14646122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61114765A Pending JPS62274002A (en) | 1986-05-21 | 1986-05-21 | Rare earth element-iron-boron type magnetic powder and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62274002A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6335701A (en) * | 1986-07-31 | 1988-02-16 | Showa Denko Kk | Flaky metallic powder having high magnetic permeability |
| JPH02153003A (en) * | 1988-12-05 | 1990-06-12 | Kobe Steel Ltd | Magnetic compound material having excellent magnetic characteristic and manufacture thereof |
-
1986
- 1986-05-21 JP JP61114765A patent/JPS62274002A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6335701A (en) * | 1986-07-31 | 1988-02-16 | Showa Denko Kk | Flaky metallic powder having high magnetic permeability |
| JPH02153003A (en) * | 1988-12-05 | 1990-06-12 | Kobe Steel Ltd | Magnetic compound material having excellent magnetic characteristic and manufacture thereof |
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