JPH0737742A - Manufacture of rare earth permanent magnet alloy - Google Patents
Manufacture of rare earth permanent magnet alloyInfo
- Publication number
- JPH0737742A JPH0737742A JP17956393A JP17956393A JPH0737742A JP H0737742 A JPH0737742 A JP H0737742A JP 17956393 A JP17956393 A JP 17956393A JP 17956393 A JP17956393 A JP 17956393A JP H0737742 A JPH0737742 A JP H0737742A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- rare earth
- magnet alloy
- heat treatment
- max
- 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.)
- Withdrawn
Links
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
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，正方晶Ｎｄ2 Ｆｅ14Ｂ
を主相とするＮｄ−Ｆｅ−Ｂ磁石に代表される，正方晶
Ｒ2 Ｔ14Ｂ（ＲはＮｄを主成分とする希土類元素（Ｙを
包含する），ＴはＦｅ，Ｃｏ，Ｎｉなどの遷移金属又は
その一部をＡｌ，Ｓｉで置換したもの）を主相とする希
土類永久磁石合金の製造方法に関する。The present invention relates to tetragonal Nd 2 Fe 14 B
Tetragonal R 2 T 14 B (R is a rare earth element (including Y) containing Nd as a main component), represented by an Nd-Fe-B magnet whose main phase is, T is Fe, Co, Ni, or the like. The present invention relates to a method for producing a rare earth permanent magnet alloy whose main phase is a transition metal or a part of which is replaced with Al or Si.
【０００２】[0002]
【従来の技術】従来，粉末冶金法により作製するＲ−Ｔ
−Ｂ系永久磁石（ＲはＮｄを主成分とする希土類元素
（Ｙを包含する），ＴはＦｅ，Ｃｏ，Ｎｉなどの遷移金
属又はその一部をＡｌ，Ｓｉで置換したもの）は，母合
金作製，粗粉砕，微粉砕，磁場中成形，焼結，熱処理の
順に作製される。そして，これらの工程の後に焼結体表
面を研削し，更に焼結体の耐食性向上のためにメッキ等
の加工を施している。2. Description of the Related Art Conventionally, RT manufactured by powder metallurgy method
-A B-based permanent magnet (R is a rare earth element containing Nd as a main component (including Y), T is a transition metal such as Fe, Co, or Ni, or a part of which is replaced with Al, Si) Alloy production, coarse pulverization, fine pulverization, forming in a magnetic field, sintering, and heat treatment are performed in this order. After these steps, the surface of the sintered body is ground and further processed such as plating to improve the corrosion resistance of the sintered body.
【０００３】[0003]
【発明が解決しようとする課題】Ｒ−Ｔ−Ｂ系永久磁石
（ＲはＮｄを主成分とする希土類元素（Ｙを包含す
る），ＴはＦｅ，Ｃｏ，Ｎｉなどの遷移金属又はその一
部をＡｌ，Ｓｉで置換したもの）は，主相が正方晶Ｒ2
Ｔ14Ｂであり，Ｎｄ2 Ｆｅ14Ｂの場合，飽和磁束密度Ｂ
ｓが約１．６（Ｔ）であることから，高い残留磁束密度
Ｂｒ，最大エネルギー積（ＢＨ）max が期待されてい
る。An R-T-B system permanent magnet (R is a rare earth element containing Nd as a main component (including Y), T is a transition metal such as Fe, Co, Ni or a part thereof. Is replaced by Al and Si), the main phase is tetragonal R 2
T 14 B, and in the case of Nd 2 Fe 14 B, the saturation magnetic flux density B
Since s is about 1.6 (T), high residual magnetic flux density Br and maximum energy product (BH) max are expected.
【０００４】一般に，Ｂｒ及び（ＢＨ）max を向上させ
る方法として，主相Ｒ2 Ｔ14Ｂの比率を上げればよい
が，Ｒ−Ｔ−Ｂ系永久磁石を粉末冶金法により作製する
場合，焼結時に液相が必要であり，このため母合金組成
を主相組成よりＲ量を多くしなければならない。このよ
うに，焼結のため焼結体中の主相Ｒ2 Ｔ14Ｂの比率の向
上にも限界がある。従って，磁気特性は母合金の組成に
よってほぼ決まる。Generally, as a method of improving Br and (BH) max , the ratio of the main phase R 2 T 14 B may be increased. However, when an RTB-based permanent magnet is manufactured by a powder metallurgy method, it is burned. Since a liquid phase is required at the time of binding, the master alloy composition must have a larger amount of R than the main phase composition. Thus, there is a limit to the improvement of the ratio of the main phase R 2 T 14 B in the sintered body due to the sintering. Therefore, the magnetic properties are almost determined by the composition of the master alloy.
【０００５】又，Ｎｄ等の希土類元素を含む合金は酸化
が著しいため，焼結時に焼結体中に酸化物等が混在する
ことによっても，焼結体中の主相の比率を低下させる原
因，つまりＢｒや（ＢＨ）max を低下させる原因となっ
ている。Further, since an alloy containing a rare earth element such as Nd is markedly oxidized, mixing of oxides and the like into the sintered body at the time of sintering also causes a decrease in the ratio of the main phase in the sintered body. That is, it is a cause of lowering Br and (BH) max .
【０００６】ところが，主相の比率を高めるためＲ量を
減少させて焼結体を作製すると，軟磁性相であるＦｅ等
の遷移金属相やＲ2 Ｔ17相が出現し，保磁力Ｈｃｊの低
下等の磁気特性の劣化が生じる。However, when the amount of R is decreased to produce a sintered body in order to increase the ratio of the main phase, a transition metal phase such as Fe or a R 2 T 17 phase, which is a soft magnetic phase, appears and the coercive force Hcj of Deterioration of magnetic properties such as deterioration occurs.
【０００７】そこで，本発明の技術的課題は，粉末冶金
により高いＢｒ及び（ＢＨ）max を得ることのできる希
土類永久磁石合金の製造方法を提供することにある。Therefore, a technical object of the present invention is to provide a method for producing a rare earth permanent magnet alloy capable of obtaining high Br and (BH) max by powder metallurgy.
【０００８】[0008]
【課題を解決するための手段】本発明者は，上記課題を
解決するために，種々の検討を行った結果，粉末冶金法
を用いて永久磁石合金を作製した後に，熱処理と永久磁
石合金表面の研削加工を繰り返すことにより，残留磁束
密度Ｂｒ及び最大エネルギー積（ＢＨ）max が向上する
ことを見い出した。Means for Solving the Problems The present inventor has conducted various studies in order to solve the above problems, and as a result, after producing a permanent magnet alloy by a powder metallurgy method, heat treatment and the surface of the permanent magnet alloy are performed. It was found that the residual magnetic flux density Br and the maximum energy product (BH) max are improved by repeating the above grinding process.
【０００９】本発明によれば，Ｒ−Ｔ−Ｂ系永久磁石合
金（但し，ＲはＮｄを主成分とする希土類元素（Ｙを包
含する），Ｔは遷移金属又はその一部をＡｌ，Ｓｉのう
ちの少なくとも一種で置換したもの）を粉末冶金法によ
り作製する方法において，該永久磁石合金に熱処理と熱
処理後の表面研削加工を繰り返すことにより，残留磁束
密度Ｂｒと最大エネルギー積（ＢＨ）max を向上させる
ことを特徴とする希土類永久磁石合金の製造方法が得ら
れる。According to the present invention, an RTB-based permanent magnet alloy (where R is a rare earth element containing Nd as a main component (including Y)), T is a transition metal or a part thereof is Al, Si In which at least one of the above is replaced by a powder metallurgy method, the residual magnetic flux density Br and the maximum energy product (BH) max are obtained by repeating heat treatment and surface grinding after the heat treatment on the permanent magnet alloy. A method for producing a rare earth permanent magnet alloy is obtained which is characterized by improving
【００１０】ここで，本発明において，ＲはＮｄを主成
分とする希土類元素で，Ｎｄ以外にＰｒ，Ｃｅ，Ｄｙ，
Ｌａ等が含まれる。また，Ｔは遷移金属又はその一部を
Ａｌ，Ｓｉのうちの少なくとも一種で置換したもので，
遷移金属としては，Ｆｅ，Ｃｏ，Ｎｉ等が例示できる
が，特にＴとしては，Ｆｅを主成分としたものが好まし
い。Here, in the present invention, R is a rare earth element containing Nd as a main component, and in addition to Nd, Pr, Ce, Dy,
La and the like are included. Further, T is a transition metal or a part thereof substituted with at least one of Al and Si,
Examples of the transition metal include Fe, Co, Ni, and the like. Particularly, T containing Fe as a main component is preferable.
【００１１】[0011]
【実施例】以下，本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【００１２】まず出発原料として純度９９．９のＮｄ及
びＤｙ，純度９９．９９のＦｅ及びＡｌ，純度９９．５
のＢを夫々使用した。これらの原料を下表１に示す組成
に配合し，高周波溶解により母合金を作製した。First, as starting materials, Nd and Dy having a purity of 99.9, Fe and Al having a purity of 99.99, and a purity of 99.5.
B of each was used. These raw materials were blended in the compositions shown in Table 1 below, and a master alloy was prepared by high frequency melting.
【００１３】[0013]
【表１】 [Table 1]
【００１４】次に母合金をＡｒ雰囲気において粗粉砕，
微粉砕した後に，約２（Ｔ）の磁場において垂直磁場中
成形を行った。次に，この成形体を真空中及びＡｒ雰囲
気において１０８０（℃），約２時間の焼結を行った。
次に，Ａｒ雰囲気において６００（℃）の各温度におい
て１時間の熱処理を行った後，焼結体表面の研削加工を
行った。この熱処理と熱処理後の焼結体表面の研削加工
の一連の工程を５回繰り返した。尚，焼結体の磁気特性
の測定は焼結体表面の研削加工後にＢ−Ｈトレーサーに
より行った。Next, the mother alloy is coarsely crushed in an Ar atmosphere,
After finely pulverizing, molding was performed in a vertical magnetic field in a magnetic field of about 2 (T). Next, this compact was sintered in a vacuum and an Ar atmosphere at 1080 (° C.) for about 2 hours.
Next, after performing a heat treatment for 1 hour at each temperature of 600 (° C.) in an Ar atmosphere, the surface of the sintered body was ground. This heat treatment and a series of steps of grinding the surface of the sintered body after the heat treatment were repeated 5 times. The magnetic characteristics of the sintered body were measured by a BH tracer after grinding the surface of the sintered body.
【００１５】図１は熱処理と焼結体表面の研削加工の繰
り返し数と磁気特性との関係を示す図である。また，比
較例として，焼結後の熱処理に焼結体表面研削を行った
後，熱処理のみを繰り返した場合の磁気特性と熱処理回
数の関係を併せて示した。FIG. 1 is a diagram showing the relationship between the magnetic properties and the number of repetitions of heat treatment and grinding of the surface of a sintered body. In addition, as a comparative example, the relationship between the magnetic characteristics and the number of times of heat treatment when the heat treatment after the sintering is performed after the surface of the sintered body is ground and only the heat treatment is repeated is also shown.
【００１６】図１に示すように，本発明の実施例では熱
処理と焼結体表面の研削加工の繰り返す数が増加するこ
とにより，Ｂｒ，（ＢＨ）max が向上した。一方，比較
例では熱処理回数が増加しても磁石特性にはほとんど変
化が見られなかった。但し，本発明の実施例では熱処理
と熱処理後の焼結体表面の研削加工の繰り返す数に対し
保磁力Ｈｃｊに変化はほとんど見られなかった。As shown in FIG. 1, in the embodiment of the present invention, Br and (BH) max were improved by increasing the number of repeating the heat treatment and the grinding of the surface of the sintered body. On the other hand, in the comparative example, there was almost no change in the magnet characteristics even when the number of heat treatments was increased. However, in the examples of the present invention, almost no change was observed in the coercive force Hcj with respect to the number of times the heat treatment and the grinding of the surface of the sintered body after the heat treatment were repeated.
【００１７】[0017]
【発明の効果】以上の説明にて述べたように，本発明に
おいては，粉末冶金法により作製するＲ−Ｔ−Ｂ系永久
磁石（但，ＲはＮｄを主成分とする希土類元素（Ｙを包
含する），Ｔは遷移金属又はその一部をＡｌ，Ｓｉのう
ちの少なくとも一種で置換したもの）において，熱処理
と熱処理後に焼結体表面の研削加工を繰り返すことによ
り，残留磁束密度Ｂｒ及び最大エネルギー積（ＢＨ）
max を向上させることができる希土類永久磁石合金の製
造方法を提供することができる。As described above, in the present invention, the RTB-based permanent magnet manufactured by the powder metallurgy method (where R is a rare earth element containing Nd as a main component (Y is , T is a transition metal or a part of which is replaced with at least one of Al and Si), and the residual magnetic flux density Br and the maximum Energy product (BH)
It is possible to provide a method for producing a rare earth permanent magnet alloy that can improve max .
【図１】６００（℃）における熱処理及び熱処理後の焼
結体表面の研削加工の繰り返す数と，磁気特性との関係
を示す図である。FIG. 1 is a diagram showing the relationship between the magnetic properties and the number of repetitions of heat treatment at 600 (° C.) and grinding of the surface of a sintered body after heat treatment.
Claims (1)
主成分とする希土類元素（Ｙを包含する），Ｔは遷移金
属又はその一部をＡｌ，Ｓｉの少なくとも一方で置換し
たもの）を粉末冶金法により作製する方法において，該
永久磁石合金に熱処理と熱処理後の表面研削加工とを繰
り返すことにより，残留磁束密度Ｂｒと最大エネルギー
積（ＢＨ）max を向上させることを特徴とする希土類永
久磁石合金の製造方法。1. An R-T-B system permanent magnet alloy (R is a rare earth element containing Nd as a main component (including Y), T is a transition metal or a part thereof is substituted with at least one of Al and Si. Of the permanent magnet alloy, the residual magnetic flux density Br and the maximum energy product (BH) max are improved by repeating heat treatment and surface grinding after the heat treatment on the permanent magnet alloy. A method for producing a rare earth permanent magnet alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17956393A JPH0737742A (en) | 1993-07-21 | 1993-07-21 | Manufacture of rare earth permanent magnet alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17956393A JPH0737742A (en) | 1993-07-21 | 1993-07-21 | Manufacture of rare earth permanent magnet alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0737742A true JPH0737742A (en) | 1995-02-07 |
Family
ID=16067923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17956393A Withdrawn JPH0737742A (en) | 1993-07-21 | 1993-07-21 | Manufacture of rare earth permanent magnet alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737742A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007287865A (en) * | 2006-04-14 | 2007-11-01 | Shin Etsu Chem Co Ltd | Process for producing permanent magnet material |
-
1993
- 1993-07-21 JP JP17956393A patent/JPH0737742A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007287865A (en) * | 2006-04-14 | 2007-11-01 | Shin Etsu Chem Co Ltd | Process for producing permanent magnet material |
| US7922832B2 (en) | 2006-04-14 | 2011-04-12 | Shin-Etsu Chemical Co., Ltd. | Method for preparing permanent magnet material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001003 |