JPH04209505A - Manufacture of rare-earth iron magnet - Google Patents
Manufacture of rare-earth iron magnetInfo
- Publication number
- JPH04209505A JPH04209505A JP2400907A JP40090790A JPH04209505A JP H04209505 A JPH04209505 A JP H04209505A JP 2400907 A JP2400907 A JP 2400907A JP 40090790 A JP40090790 A JP 40090790A JP H04209505 A JPH04209505 A JP H04209505A
- Authority
- JP
- Japan
- Prior art keywords
- earth iron
- magnet
- rare
- powder
- rare earth
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 20
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 238000007747 plating Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 2
- 229910002058 ternary alloy Inorganic materials 0.000 abstract description 2
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 241000221535 Pucciniales Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NINOVVRCHXVOKB-UHFFFAOYSA-N dialuminum;dioxido(dioxo)chromium Chemical compound [Al+3].[Al+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O NINOVVRCHXVOKB-UHFFFAOYSA-N 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- 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
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0572—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
- Thin Magnetic Films (AREA)
Abstract
Description
【産業上の利用分野］本発明は希土類鉄系磁石の製造方
法に関する発明である。詳しくは高耐食性化に関するも
のである。磁石を利用した機器は、モーター等の回転機
器からコンピュータの端末に到るまで幅広く利用されて
いる。とりわけ希土類鉄系磁石は市販されている磁石の
中で最も大きい最大エネルギー積を持ち、磁石を利用し
た機器の高性能化および小型化へ貢献している。
［０００２］希土類鉄系磁石は、資源的に豊富なＮｄ。
Ｃｅ等を利用でき、しかも磁石の７割（原子百分率）以
上が安価な鉄であることから、希土類コバルト系磁石と
比べ安価に製造できる。また磁気特性の面においても、
最大エネルギー積が希土類コバルト磁石、たとえばＳｍ
Ｃｏ系磁石のそれと比較し、約１．５倍も大きいため、
近年、希土類磁石市場において急速に普及しつつある。
しかしながら、鉄を主成分とするため容易に錆が発生し
、実用上防錆処理が不可欠である。このため防錆処理の
容易な大型の部材では十分使用可能であるが、小型・微
小磁石部材では磁石体積の減少と共に、防錆処理に伴う
磁石表面層のダメージ比率の増大あるいは表面保護層の
厚みによる磁気特性への影響が無視できなくなり、最大
エネルギー積の低下が著しい。このことは、小型・微小
磁石においては、実用上、希土類鉄系磁石の使用は極め
て困難であることを意味している。
［０００３１本発明は係る欠点を克服する希土類鉄系磁
石の製造方法において、希土類鉄系磁性粉末の表面（−
厚み０．１〜５，０μｍのＮｉ層を持つ複合磁性粉末を
用いることにより、耐食性に優れた高性能希土類鉄系磁
石を作製することができた。本発明の工業的価値は極め
て大きい。
［０００４］
【従来の技術】従来は、磁石表面を保護層で被覆するこ
とにより、耐食性を高めるとの発想から、アルミ−クロ
メート処理、エポキシ電着塗装およびＮｉ電着メツキ等
が広く用いられている。
［０００５］[Industrial Application Field] The present invention relates to a method for manufacturing rare earth iron magnets. More specifically, it relates to high corrosion resistance. Devices using magnets are widely used, from rotating devices such as motors to computer terminals. In particular, rare earth iron magnets have the highest maximum energy product among commercially available magnets, contributing to higher performance and smaller size of devices that use magnets. [0002] Rare earth iron magnets include Nd, which is a rich resource. Since it can use materials such as Ce and more than 70% (atomic percentage) of the magnet is cheap iron, it can be manufactured at a lower cost than rare earth cobalt magnets. Also, in terms of magnetic properties,
The maximum energy product is rare earth cobalt magnet, for example Sm
It is about 1.5 times larger than that of Co-based magnets, so
In recent years, rare earth magnets are rapidly becoming popular in the market. However, since it is mainly composed of iron, it easily rusts, and rust prevention treatment is essential for practical purposes. For this reason, it can be used satisfactorily for large components that can be easily treated with rust prevention treatment, but with small and micro magnet components, the magnet volume decreases and the damage ratio of the magnet surface layer increases due to rust prevention treatment, or the thickness of the surface protective layer increases. The influence of this on the magnetic properties can no longer be ignored, and the maximum energy product decreases significantly. This means that it is extremely difficult to use rare earth iron-based magnets in small and micro magnets in practice. [00031 The present invention provides a method for manufacturing a rare earth iron magnet that overcomes the above drawbacks, in which the surface of the rare earth iron magnetic powder (-
By using a composite magnetic powder having a Ni layer with a thickness of 0.1 to 5.0 μm, a high-performance rare earth iron-based magnet with excellent corrosion resistance could be produced. The industrial value of the present invention is extremely large. [0004] Conventionally, aluminum chromate treatment, epoxy electrodeposition coating, Ni electrodeposition plating, etc. have been widely used based on the idea that corrosion resistance can be improved by coating the magnet surface with a protective layer. There is. [0005]
【発明が解決しようとする課題】従来の表面処理による
方法では、小型・微小部材においては、最大エネルギー
積が低下することから、利用できないのが現状である。
小型・微小部材においては、磁石地金そのものの耐食性
を高める必要がある。
［０００６］[Problems to be Solved by the Invention] Currently, conventional surface treatment methods cannot be used for small and minute components because the maximum energy product decreases. For small and minute components, it is necessary to improve the corrosion resistance of the magnet metal itself. [0006]
【課題を解決するための手段】希土類鉄系磁石の製造方
法において、希土類鉄系磁性粉末の表面に、厚み０４１
〜５．０μｍのＮｉ層を持つ複合磁性粉末を用いること
により、課題を解決した。Ｎｉ層の厚みを限定した理由
は０． １μｍ以下の厚みでは、耐食性改善への効果が
小さいためであり、逆に５．０μｍ以上の厚みでは、残
留磁化、保磁力共に低下し、最大エネルギー積の低下が
著しいためである。
［０００７］
【実施例］ Ｎｄ＋５Ｆ ｅ７７８ｇ ３元合金をア
ーク溶解により、溶製し出発原料とした。次に本合金イ
ンゴットをボールミルを用いて粉砕化した。この時得ら
れた粉末の粒度は３． ０〜３． ５μｍ （Ｆ、
Ｓ、 Ｓ、 Ｓ）であった。
本粉末に無電解Ｎｉメツキにより、Ｎｉを粉末表面にコ
ーティングした。本複合粉末は横磁界成型（磁界方向千
成型方向）法により、圧力２． Ｏｔ ｏｎ／ｃｍ２
、印加磁界２０ｋｏｅの条件にて成型し異方性グリーン
とした。
［０００８１次に異方性グリーンを１０５０℃〜１１３
０℃で１時間保持することにより焼結を行った。更に保
磁力の改善を目的に、６００℃で１時間焼きなましだ後
、徐冷し試料とした。磁気特性の評価は試料を切断器を
用いて円柱状に切り出した後、水平同軸補償サーチコイ
ルを用いてＢ−Ｈカーブを測定し、レコーダー上に描か
れた減磁曲線を直続することにより求めた。
［０００９］耐食性の評価は４０℃で９５％の温度の環
境に、試料を５００時間被晒させ、試料の露出断面積あ
たりの重量変化により評価した。ここで、試料の重量変
化はほとんど錆に起因することから、重量変化が小さい
ほど耐食性が高いと考えて良い。 （図１に示す）［０
０１０１
【発明の効果］耐食性に優れた高性能希土類鉄系磁石を
提供する。従来のＳ ｍ Ｃｏ系磁石と比べ、コスト磁
気特性および耐食性の面で同等もしくはそれを凌ぐ効果
が得られたものである。[Means for Solving the Problems] In a method for manufacturing a rare earth iron magnet, the surface of the rare earth iron magnetic powder has a thickness of 041 mm.
The problem was solved by using a composite magnetic powder with a Ni layer of ~5.0 μm. The reason for limiting the thickness of the Ni layer is 0. This is because if the thickness is 1 μm or less, the effect on improving corrosion resistance is small, and if the thickness is 5.0 μm or more, both residual magnetization and coercive force decrease, and the maximum energy product decreases significantly. [0007] [Example] A ternary alloy of Nd+5F e778g was melted by arc melting and used as a starting material. Next, this alloy ingot was pulverized using a ball mill. The particle size of the powder obtained at this time was 3. 0-3. 5 μm (F,
S, S, S). The powder surface was coated with Ni by electroless Ni plating. This composite powder was produced using a transverse magnetic field molding method (magnetic field direction: 1,000 molding directions) under a pressure of 2. Oton/cm2
It was molded under the conditions of an applied magnetic field of 20 koe to obtain an anisotropic green. [00081 Next, anisotropic green is heated to 1050℃~113℃
Sintering was performed by holding at 0°C for 1 hour. Furthermore, in order to improve the coercive force, the sample was annealed at 600° C. for 1 hour and then slowly cooled. The magnetic properties were evaluated by cutting the sample into a cylindrical shape using a cutter, measuring the B-H curve using a horizontal coaxial compensation search coil, and directly connecting the demagnetization curve drawn on the recorder. I asked for it. [0009] Corrosion resistance was evaluated by exposing the sample to an environment of 95% temperature at 40° C. for 500 hours, and evaluating the weight change per exposed cross-sectional area of the sample. Here, since most of the weight change of the sample is due to rust, it can be considered that the smaller the weight change, the higher the corrosion resistance. (shown in Figure 1) [0
[Effects of the Invention] A high performance rare earth iron magnet with excellent corrosion resistance is provided. Compared to conventional S m Co-based magnets, it has the same or better effects in terms of cost magnetic properties and corrosion resistance.
【図１１Ｎｉ層の厚みによる特性図である。 【図１】FIG. 11 is a characteristic diagram according to the thickness of the Ni layer. [Figure 1]
Claims (1)
類鉄系磁石粉末の表面に、厚み０．１〜５．０μｍのＮ
ｉ層を持つ複合磁性粉末を用いることを特徴とする希土
類鉄系磁石の製造方法。Claim 1: In a method for manufacturing a rare earth iron magnet, N is applied to the surface of rare earth iron magnet powder to a thickness of 0.1 to 5.0 μm.
A method for producing a rare earth iron magnet, characterized by using a composite magnetic powder having an i-layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2400907A JPH04209505A (en) | 1990-12-07 | 1990-12-07 | Manufacture of rare-earth iron magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2400907A JPH04209505A (en) | 1990-12-07 | 1990-12-07 | Manufacture of rare-earth iron magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04209505A true JPH04209505A (en) | 1992-07-30 |
Family
ID=18510772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2400907A Pending JPH04209505A (en) | 1990-12-07 | 1990-12-07 | Manufacture of rare-earth iron magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04209505A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903826A (en) * | 2014-04-04 | 2014-07-02 | 北京工业大学 | Corrosion-resistant neodymium, iron and boron permanent magnet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62284002A (en) * | 1986-05-02 | 1987-12-09 | Tohoku Metal Ind Ltd | Magnetic alloy powder consisting of rare earth element |
| JPS6415301A (en) * | 1987-07-08 | 1989-01-19 | Kawasaki Steel Co | Rare earth metal-iron group alloy powder for resin combination type permanent magnet having excellent corrosion resistance |
-
1990
- 1990-12-07 JP JP2400907A patent/JPH04209505A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62284002A (en) * | 1986-05-02 | 1987-12-09 | Tohoku Metal Ind Ltd | Magnetic alloy powder consisting of rare earth element |
| JPS6415301A (en) * | 1987-07-08 | 1989-01-19 | Kawasaki Steel Co | Rare earth metal-iron group alloy powder for resin combination type permanent magnet having excellent corrosion resistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903826A (en) * | 2014-04-04 | 2014-07-02 | 北京工业大学 | Corrosion-resistant neodymium, iron and boron permanent magnet |
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