JPH0268904A - Manufacture of alloy powder for rare earth-fe-b system bond magnet - Google Patents
Manufacture of alloy powder for rare earth-fe-b system bond magnetInfo
- Publication number
- JPH0268904A JPH0268904A JP63221552A JP22155288A JPH0268904A JP H0268904 A JPH0268904 A JP H0268904A JP 63221552 A JP63221552 A JP 63221552A JP 22155288 A JP22155288 A JP 22155288A JP H0268904 A JPH0268904 A JP H0268904A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- rare earth
- spherical powder
- alloy
- liquid
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 19
- 239000000956 alloy Substances 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000000112 cooling gas Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 6
- 150000002910 rare earth metals Chemical class 0.000 claims 1
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 229910000521 B alloy Inorganic materials 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000009689 gas atomisation Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011084 recovery 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
- H01F1/0574—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 obtained by liquid dynamic compaction
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
〔産業上の利用分野〕
本発明は、希土類−Ｆｅ−Ｂ系ボンド磁石用合金粉末の
製造方法に関し、特に製造工程が削減でき、且つこの合
金粉末により製造されるボンド磁石の磁気特性を向上す
ることができる希土類−Ｆｅ−Ｂ系ボンド磁石用合金粉
末の製造方法に関する。
〔従来技術〕
希土類−Ｆｅ−Ｂ系ポンド磁石用合金粉末を製造する技
術としては、例えば特開昭６２−２０８６０９号公報に
開示の如き方法が知られている。
この方法は、いわゆるロール急冷法もしくはガスアトマ
イズ法によりボンド磁石用合金粉末を製造する方法で、
ロール急冷もしくはガスアトマイズにより急、速冷却し
て得られた結晶状のリボンもしくは粉末を、０．１〜２
０μｍに粉砕し、結晶化と歪とり焼鈍のために焼結のお
こらない８００°Ｃ以下の温度にて熱処理する方法であ
る。
〔発明が解決しようとする課題〕
このような従来の希土類−Ｆｅ−Ｂ系ボンド磁石用合金
粉末の製造方法では、ロール急冷もしくはガスアトマイ
ズにより得られたリボンもしくは粉末を更に、機械的に
粉砕して使用している。このため、製造工程が増える。
粉砕時に酸化あるいは粉砕工具からの混粉を生じ磁気特
性が劣化する、粉砕して得られた粉末の形状が角ばった
形状となり次工程の成形時に流動性が悪く、成形後のボ
ンド磁石の充填密度が低く磁気特性が劣化するなどの問
題があった。
従って、本発明の目的とするところは、製造工程が削減
でき、且つこの製造方法により製造されるボンド磁石の
磁気特性を向上させることができる希土類−Ｆｅ−Ｂ系
ボンド磁石用合金粉末の製造方法を提供することである
。
〔課題を解決するための手段〕
上記目的を達成するために、本発明が採用する主たる手
段は、原子百分率で８８〜２５％（ＲはＹを含む希土類
元素の一種あるいは二種以上を組み合わせて用いる），
Ｂ２〜８％、残部が鉄及びその他製造上不可避な不純物
からなる合金を溶融してノズルより噴出し、これに２．
冷速度が１０３に／ｓｅｃ以上となるように不活性冷却
ガスを吹き付け、平均粒径２０〜８０μｍ、アスペクト
比（長径／短径）１．３以下の球形粉末を得た後、該ｆ
、に形粉末を８００°Ｃ以下の温度で熱処理する点であ
る。
即ち、本発明は、いわゆるガスアトマイ、ズ法を希土類
−Ｆｅ−Ｂ系ボンド磁石用合金粉末の製造方法に応用し
たもので、原子百分率で８８〜２５％（ＲはＹを含む希
土類元素の一種あるいは二種以上を組み合わせて用いる
），Ｂ２〜８％、残部が鉄及びその他製造上不可避な不
純物からなる合金を溶融してノズルより噴出し、これに
急冷速度が１０３に／ｓｅｃ以上となるように不活性ガ
スを吹き付けることにより、平均粒径２０〜８０μｍ。
アスペクト比（長径／短径）１．３以下の球形粉末を得
るものである。この球形粉末は、形状的にも磁気特性に
も優れているため、このままの状態で熱処理を行いボン
ド磁石を製造することができる。
ここで９冷速度をＩ Ｏ’ ｋ ／ｓｅｃ以北とするの
は、１０’ ｋ／ｓｅｃ未満では、得られる球形粉末に
α−Ｆｅが晶出し、このα−Ｆｅを拡散させるためには
，Ｂ００ ’Ｃ以上で熱処理しなければならなくなるた
めである。また，Ｂ００°Ｃ以下で熱処理するのは，Ｂ
００ ’Ｃより高い温度で球形粉末を熱処理すると、焼
結による接着や酸化がおこり、磁気特性を劣化させるた
めである。そして、平均粒径２０〜８０μｍ１アスペク
ト比（長径／短径）１．３以下の球形粉末を得るように
したのは、平均粒径が２０μｍ未満では酸化や焼結をお
こし，Ｂ０１１ｍより大きい場合はα−Ｆｅが品出する
ため好ましくなく、アスペクト比１．３より大きい粉末
では、成形時に流動性が悪（なるためである。
〔実施例〕
続いて、添付した図面を参照して、本発明を具体化した
一実施例につき説明し、本発明の理解に供するにこに第
１図は、本発明の一実施例に用いる粉末製造装置の概略
側断面図である。
この実施例では、原子百分率で８８〜２５％（ＲはＹを
含む希土類元素の一種あるいは二種以上を組み合わせて
用いる），Ｂ２〜８％、残部が鉄及びその他製造上不可
避な不純物からなる合金ｌを溶融して、真空チャンバ部
１０内に配設されたタンデイツシュ２の先端のノズル３
より噴出し、これに２．冷速度がＩ Ｏ’ ｋ ／ｓｅ
ｃ以上となるように不活性冷却ガス（ＨｅあるいはＨｅ
とＡ、の混合ガス）をアトマイズノズル４より吹き付け
る。
そうすると、アトマイズチャンバ部ｌｌ内で平均粒径２
０〜８０μｍ、アスペクト比（長径／短径）１．３以下
の球形粉末が得られる。
このようにして得られた球形粉末は、粉末回収部１２の
粉末回収容器５内に入れられた不活性ガスの液体（液体
Ａ１．液体Ｈｅ、液体Ｎ２の一種あるいは二種以上を組
み合わせたもの）６により冷却され回収される。そして
、回収された球形粉末は，Ｂ００°Ｃ以下の温度で熱処
理される。
なお、不活性冷却ガスとして、ＨｅあるいはＨｅとＡ、
の混合ガスとしたのは、例えばＡ、ガスを用いた場合、
得られる球形粉末にα−Ｆｅが晶出し、熱処理を８００
°Ｃより高い温度で行わなければならなくなるためであ
る。また、球形粉末の回収を不活性ガスの液体により行
うのは、不活性ガスの雰囲気内で回収した場合、やはり
α−Ｆｅが晶出するからである。
以上の方法により製造したボンド磁石用合金粉末の磁気
特性を表１に示す。ここで、合金組成は原子百分率で１
３％Ｎａ−８１％Ｆｅ−６％Ｂ。
アトマイズ圧力は９０ｋｇ／ｃＪ、得られる球形粉末の
平均粒径は２５μｍ、熱処理温度は５００°Ｃの条件下
で製造した。表１において、射出成形性とは、メルトイ
ンデックス法で射出成形圧力５ｋｇ／ｃ＋ｆｌにおける
吐出粉末量を表し、従来法（２）のアスペクト比５の粉
末の吐出粉末量を１とした場合の吐出量比、磁気特性と
は、射出成形したボンド磁石の（Ｂ Ｈ） ｍａｙの値
（ＭＧＯｅ）である。
これによると、従来法に比べて本実施例法により製造し
たボンド磁石の方が磁気特性に優れどいることがわかる
。特に、不活性冷却ガスとしてＨｅ回収雰囲気として液
体Ａｒを用いた実施例法（３）については、射出成形性
及び磁気特性の両方ともが優れた値を示Ｌ７ている。[Industrial Application Field] The present invention relates to a method for producing rare earth-Fe-B alloy powder for bonded magnets, and in particular, a method that reduces the number of production steps and improves the magnetic properties of bonded magnets produced using this alloy powder. The present invention relates to a method for producing rare earth-Fe-B alloy powder for bonded magnets. [Prior Art] As a technique for producing rare earth-Fe-B based alloy powder for pound magnets, a method as disclosed in, for example, Japanese Patent Application Laid-Open No. 62-208609 is known. This method is a method of manufacturing alloy powder for bonded magnets using the so-called roll quenching method or gas atomization method.
A crystalline ribbon or powder obtained by rapid cooling by roll quenching or gas atomization is 0.1 to 2
This is a method in which the material is pulverized to 0 μm and heat treated at a temperature of 800° C. or lower, where sintering does not occur, for crystallization and strain relief annealing. [Problems to be Solved by the Invention] In such a conventional method for producing rare earth-Fe-B alloy powder for bonded magnets, the ribbon or powder obtained by roll quenching or gas atomization is further mechanically pulverized. I am using it. This increases the number of manufacturing steps. During pulverization, oxidation or mixed powder from the pulverizing tool occurs, resulting in deterioration of magnetic properties.The shape of the powder obtained by pulverization becomes angular, resulting in poor fluidity during molding in the next step, and the packing density of the bonded magnet after molding. There were problems such as low magnetic properties and deterioration of magnetic properties. Therefore, the object of the present invention is to provide a method for manufacturing rare earth-Fe-B alloy powder for bonded magnets, which can reduce manufacturing steps and improve the magnetic properties of bonded magnets manufactured by this manufacturing method. The goal is to provide the following. [Means for Solving the Problems] In order to achieve the above object, the main means adopted by the present invention is 88 to 25% in atomic percentage (R is one or a combination of two or more rare earth elements including Y). use),
An alloy consisting of 2 to 8% B, the balance being iron and other impurities unavoidable in manufacturing is melted and ejected from a nozzle, and 2.
After spraying an inert cooling gas at a cooling rate of 103/sec or more to obtain a spherical powder with an average particle size of 20 to 80 μm and an aspect ratio (major axis/minor axis) of 1.3 or less, the f
, the square-shaped powder is heat-treated at a temperature of 800°C or less. That is, the present invention applies the so-called gas atomization method to a method for producing rare earth-Fe-B alloy powder for bonded magnets. (used in combination of two or more types), B2 to 8%, the balance consisting of iron and other impurities unavoidable in manufacturing is melted and ejected from a nozzle, and the quenching rate is 103/sec or more. By spraying with inert gas, the average particle size is 20 to 80 μm. A spherical powder having an aspect ratio (major axis/minor axis) of 1.3 or less is obtained. Since this spherical powder has excellent shape and magnetic properties, it can be heat-treated as it is to produce a bonded magnet. Here, the reason why the cooling rate is set north of I O' k /sec is that if the cooling rate is less than 10' k/sec, α-Fe will crystallize in the obtained spherical powder, and in order to diffuse this α-Fe, This is because heat treatment must be performed at B00'C or higher. In addition, heat treatment at temperatures below B00°C
This is because if the spherical powder is heat-treated at a temperature higher than 00'C, adhesion and oxidation due to sintering will occur, deteriorating the magnetic properties. The reason for obtaining spherical powder with an average particle size of 20 to 80 μm and an aspect ratio (major axis/breadth axis) of 1.3 or less is because if the average particle size is less than 20 μm, oxidation and sintering will occur, and if it is larger than B011m, This is undesirable because α-Fe is undesirable, and powders with an aspect ratio larger than 1.3 have poor fluidity during molding. 1 is a schematic side sectional view of a powder manufacturing apparatus used in an embodiment of the present invention. In this embodiment, an atomic Melting an alloy l consisting of 88 to 25% in percentage (R is one or a combination of two or more rare earth elements including Y), B2 to 8%, and the balance is iron and other impurities unavoidable in manufacturing, A nozzle 3 at the tip of a tandem dish 2 arranged in the vacuum chamber section 10
More gushing, and 2. The cooling rate is I O' k /se
Inert cooling gas (He or He
and A) is sprayed from the atomizing nozzle 4. Then, in the atomizing chamber section ll, the average particle size is 2.
A spherical powder having a diameter of 0 to 80 μm and an aspect ratio (major axis/minor axis) of 1.3 or less is obtained. The spherical powder obtained in this way is an inert gas liquid (liquid A1, liquid He, liquid N2, or a combination of two or more types) placed in the powder collection container 5 of the powder collection section 12. 6 and collected. The collected spherical powder is then heat treated at a temperature of B00°C or lower. In addition, as an inert cooling gas, He or He and A,
For example, when using gas A,
α-Fe crystallizes in the resulting spherical powder, and heat treatment is performed at 800°C.
This is because it has to be carried out at a temperature higher than °C. Further, the reason why the spherical powder is collected using an inert gas liquid is that α-Fe will crystallize if the powder is collected in an inert gas atmosphere. Table 1 shows the magnetic properties of the alloy powder for bonded magnets produced by the above method. Here, the alloy composition is 1 in atomic percentage.
3%Na-81%Fe-6%B. The atomization pressure was 90 kg/cJ, the average particle size of the resulting spherical powder was 25 μm, and the heat treatment temperature was 500°C. In Table 1, injection moldability refers to the amount of powder discharged at an injection molding pressure of 5 kg/c+fl using the melt index method, and the amount of powder discharged when the amount of powder discharged with an aspect ratio of 5 in conventional method (2) is set to 1. The magnetic property is the (B H) may value (MGOe) of the injection molded bonded magnet. According to this, it can be seen that the bonded magnet manufactured by the method of this example has better magnetic properties than the conventional method. In particular, Example Method (3) in which liquid Ar was used as the inert cooling gas and the He recovery atmosphere showed excellent values for both injection moldability and magnetic properties.
本発明によれば、原子百分率でＲ８−２５％（ＲはＹを
含む希土類元素の一種あるいは二種以上を組み合わせて
用いる’），Ｂ２〜８％、残部が鉄及びその他製造上不
可避な不純物からなる合金を溶融してノズルより噴出し
、これに栄冷速度が１０’に／ｓｅｃ以上となるように
不活性冷却ガスを吹き付け、平均粒径２０〜８０μｍ、
アスペクト比（長径／短径）１．３以下の球形粉末を得
た後、該球形粉末を８００°Ｃ以下の温度で熱処理する
ことを特徴とする粘土ＮＲ−Ｆｅ−Ｂ系ボンド磁石用合
金粉末の製造方法が提供され１．：れによりガスアトマ
イズで得られた球形粉末を機械的にわ）砕せず、そのま
ま熱処理が行えるため製造工程が削減でき、コストダウ
ンが図れる。また、この合金粉末から製造されるボンド
磁石は磁気特性も優れている。According to the present invention, the atomic percentage is R8-25% (R is one or a combination of two or more rare earth elements including Y), B2-8%, and the balance is iron and other impurities unavoidable in manufacturing. The alloy is melted and ejected from a nozzle, and an inert cooling gas is blown onto it so that the cooling rate is 10'/sec or more, and the average particle size is 20 to 80 μm.
Clay NR-Fe-B alloy powder for bonded magnets characterized by obtaining spherical powder with an aspect ratio (major axis/minor axis) of 1.3 or less, and then heat-treating the spherical powder at a temperature of 800°C or less. A manufacturing method is provided.1. As a result, the spherical powder obtained by gas atomization can be heat-treated as it is without mechanically crushing it, reducing the manufacturing process and reducing costs. Additionally, bonded magnets manufactured from this alloy powder have excellent magnetic properties.
１・・合金 ３・・・ノズル ６・・・不活性ガスの液体。 第１図 出願人 株式会社神戸！！！鋼所 1. Alloy 3... Nozzle 6...Inert gas liquid. Figure 1 Applicant: Kobe Co., Ltd.! ! ! steelworks
Claims (3)
元素の一種あるいは二種以上を組み合わせて用いる），
Ｂ２〜８％，残部が鉄及びその他製造上不可避な不純物
からなる合金を溶融してノズルより噴出し、これに急冷
速度が１０＾３ｋ／ｓｅｃ以上となるように不活性冷却
ガスを吹き付け、平均粒径２０〜８０μｍ，アスペクト
比（長径／短径）１．３以下の球形粉末を得た後、該球
形粉末を８００℃以下の温度で熱処理することを特徴と
する希土類−Ｆｅ−Ｂ系ボンド磁石用合金粉末の製造方
法。(1) R8 to 25% in atomic percentage (R is one or a combination of two or more rare earth elements including Y),
An alloy consisting of B2~8%, the balance being iron and other impurities unavoidable in manufacturing is melted and ejected from a nozzle, and an inert cooling gas is sprayed onto it so that the quenching rate is 10^3 k/sec or more, and the average A rare earth-Fe-B bond characterized in that after obtaining a spherical powder with a particle size of 20 to 80 μm and an aspect ratio (major axis/minor axis) of 1.3 or less, the spherical powder is heat-treated at a temperature of 800°C or less. A method for producing alloy powder for magnets.
の混合ガスを用いるようにした請求項（１）記載の希土
類−Ｆｅ−Ｂ系ボンド磁石用合金粉末の製造方法。(2) He or He and Ar as an inert cooling gas
The method for producing a rare earth-Fe-B bonded magnet alloy powder according to claim 1, wherein a mixed gas of:
末を、液体Ａｒ，液体Ｈｅ，液体Ｎ＿２の一種あるいは
二種以上を組み合わせた不活性ガスの液体により冷却し
て回収するようにした請求項（１）記載の希土類−Ｆｅ
−Ｂ系ボンド磁石用合金粉末の製造方法。(3) A claim in which the spherical powder obtained by spraying an inert cooling gas is cooled and recovered by an inert gas liquid that is a combination of one or more of liquid Ar, liquid He, and liquid N_2. (1) Rare earth described - Fe
- A method for producing alloy powder for B-based bonded magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63221552A JPH0268904A (en) | 1988-09-05 | 1988-09-05 | Manufacture of alloy powder for rare earth-fe-b system bond magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63221552A JPH0268904A (en) | 1988-09-05 | 1988-09-05 | Manufacture of alloy powder for rare earth-fe-b system bond magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0268904A true JPH0268904A (en) | 1990-03-08 |
Family
ID=16768508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63221552A Pending JPH0268904A (en) | 1988-09-05 | 1988-09-05 | Manufacture of alloy powder for rare earth-fe-b system bond magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0268904A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002536539A (en) * | 1999-02-01 | 2002-10-29 | マグネクウェンチ インターナショナル インコーポレイテッド | Rare earth permanent magnet alloy and its manufacturing method |
| EP1554411A1 (en) | 2002-10-25 | 2005-07-20 | Showa Denko K.K. | Alloy containing rare earth element, production method thereof, magnetostrictive device, and magnetic refrigerant material |
-
1988
- 1988-09-05 JP JP63221552A patent/JPH0268904A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002536539A (en) * | 1999-02-01 | 2002-10-29 | マグネクウェンチ インターナショナル インコーポレイテッド | Rare earth permanent magnet alloy and its manufacturing method |
| EP1554411A1 (en) | 2002-10-25 | 2005-07-20 | Showa Denko K.K. | Alloy containing rare earth element, production method thereof, magnetostrictive device, and magnetic refrigerant material |
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