JPH0273905A - Production of alloy powder for rare earth element-fe-b permanent magnet - Google Patents
Production of alloy powder for rare earth element-fe-b permanent magnetInfo
- Publication number
- JPH0273905A JPH0273905A JP22713788A JP22713788A JPH0273905A JP H0273905 A JPH0273905 A JP H0273905A JP 22713788 A JP22713788 A JP 22713788A JP 22713788 A JP22713788 A JP 22713788A JP H0273905 A JPH0273905 A JP H0273905A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- alloy
- rare earth
- alloy powder
- molten alloy
- 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
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 40
- 239000000956 alloy Substances 0.000 title claims abstract description 40
- 239000000843 powder Substances 0.000 title claims abstract description 40
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 150000002910 rare earth metals Chemical class 0.000 title description 2
- 229910052751 metal Inorganic materials 0.000 claims abstract description 61
- 239000002184 metal Substances 0.000 claims abstract description 61
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000000112 cooling gas Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 229910000521 B alloy Inorganic materials 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 abstract description 15
- 239000001301 oxygen Substances 0.000 abstract description 15
- 239000011819 refractory material Substances 0.000 abstract description 6
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 9
- 238000009689 gas atomisation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、希土類−Ｆ ｅ −１３系永久磁石用合金粉
末の製造方法に関し、特に酸素量の少ない永久磁石用合
金粉末が得られ、且つ上記永久磁石用合金粉末の収率を
上げることのできる希土類−ＦｅＢ系永久磁石用合金粉
末の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing rare earth-Fe-13 based alloy powder for permanent magnets, which produces an alloy powder for permanent magnets with a particularly low oxygen content, and The present invention relates to a method for producing rare earth-FeB alloy powder for permanent magnets, which can increase the yield of the alloy powder for permanent magnets.
希土類−Ｆ ｅ −Ｂ系永久磁石用合金粉末を製造する
技術としては、インゴットを機械的に粉砕して粉末を得
る方法（特公昭６ ］、−３４３４２＞あるいは、溶湯
を水冷したロール」二で象、冷し、得られた箔を機械的
に粉砕する方法（特開昭５７−２１０３９４）などが知
られているが、これらの方法よりも優れた方法として、
特開昭６２−２９１９０４号公報に開示の如き製造方法
が提案されている。Techniques for producing rare earth-F e -B alloy powder for permanent magnets include a method of mechanically crushing an ingot to obtain powder (Special Publication No. 6], -34342), or a method of producing a powder by mechanically crushing an ingot (Japanese Patent Publication No. 6), or using a roll in which molten metal is water-cooled. Methods such as cooling, cooling, and mechanically crushing the obtained foil (Japanese Unexamined Patent Publication No. 57-210394) are known, but as a method superior to these methods,
A manufacturing method as disclosed in Japanese Unexamined Patent Publication No. 62-291904 has been proposed.
この製造方法は、いわゆるガスアトマイズ法により希土
類−Ｆｅ−Ｂ系永久磁石用合金粉末を製造する方法で、
溶湯を不活性ガスアトマイズ法で噴霧することにより５
０〜１０００ ｌｔ ｍの札＄′壱とし、該粗粒を真空
中、もしくは不活性雰囲気中１ｏ ｏ ｏ ’ｃ以下で
熱処理した後、機械的粉砕法により３０μｍ以下の粉末
に形成する方法である。This manufacturing method is a method of manufacturing rare earth-Fe-B alloy powder for permanent magnets by the so-called gas atomization method.
5 by spraying the molten metal using an inert gas atomization method.
This is a method in which coarse particles of 0 to 1000 lt m are heat-treated at a temperature of 1 o o o' c or less in a vacuum or in an inert atmosphere, and then formed into a powder of 30 μm or less by a mechanical crushing method. .
このガスアトマイズ法を用いた希土類−ＦｅＢ系永久磁
石用合金粉末の製造方法では、合金溶湯を取り扱う溶湯
保持容器及び溶湯ノズルの耐火物にＡｐ、２０３ 、Ｍ
ｇＯ，ＺｒＯ２等を主成分とする材料が用いられている
。このため、溶湯中の活性な希土類元素が上記耐火物を
還元し、生成した希土類酸化物が上記溶湯保持容器及び
溶湯ノズルの内壁に付着、或いは溶湯中に浮遊する。In this method for producing rare earth-FeB alloy powder for permanent magnets using the gas atomization method, Ap, 203, M
Materials whose main components are gO, ZrO2, etc. are used. Therefore, the active rare earth elements in the molten metal reduce the refractory, and the generated rare earth oxides adhere to the inner walls of the molten metal holding container and the molten metal nozzle, or float in the molten metal.
更に、上記溶湯保持容器及び溶湯ノズルは通常外部から
冷却されるため、その内壁近傍の溶湯が冷却され、内壁
近傍の溶湯中の酸素の活量がト昇し、酸素が熔解塵取１
−になる。そし５て、ごの溶解塵取Ｊ−になった酸素は
、溶湯中で最も活性な希土類元素と結び（＝ｊいて希土
類酸化物を生成し、該希土類酸化物が上記と同様に溶湯
保持容器や溶湯ノズルの内壁に付着、或いは？８湯中に
浮遊する。Furthermore, since the molten metal holding container and the molten metal nozzle are usually cooled from the outside, the molten metal near the inner wall is cooled, the activity of oxygen in the molten metal near the inner wall increases, and the oxygen is removed from the melt dust collector 1.
becomes −. Then, the oxygen that has become the melt dust collector J- combines with the most active rare earth element in the molten metal (=j) to form a rare earth oxide, and the rare earth oxide is transferred to the molten metal holding container in the same way as above. or adhere to the inner wall of the molten metal nozzle, or float in the molten metal.
このように希土類酸化物が溶湯保持容器内壁に付着成長
し、合金を酸化物内部にｔｉｌｔ捉するようになると大
きな地金付きがおごり、溶湯保持容器から合金の溶湯を
供給することができなくなる。In this way, when the rare earth oxide adheres and grows on the inner wall of the molten metal holding container and the alloy comes to be trapped inside the oxide, a large amount of base metal is deposited, making it impossible to supply molten alloy from the molten metal holding container.
また、溶湯ノズルの内壁に上記希土類酸化物が付着成長
すると、ノズル径が見かけ一ト細くなりアトマイズ時間
が旦くなったり、ノズル閉塞を起こしてアトマイズが不
６Ｊ能になることがある。そして、アＩ・マイズが行え
た場合でも、溶湯ノズル径が徐すに細くなるため、得ら
れる粉末の粒度の範囲が広がり、所定の粒度分布範囲の
粉末を製造するには好ましくない。Furthermore, if the rare earth oxide adheres and grows on the inner wall of the molten metal nozzle, the diameter of the nozzle will appear to become smaller and the atomization time may become shorter, or the nozzle may become clogged and atomization may become impossible. Even if it is possible to carry out Aimize, the diameter of the molten metal nozzle gradually becomes smaller, so the particle size range of the obtained powder widens, which is not preferable for producing powder with a predetermined particle size distribution range.
−・ツノ、上記のような酸化物が溶湯中を浮遊するごと
によって、得られた粉末中に５００ｐｐｍ以上の酸素を
含む場合がある。このような酸素量の多い粉末を用いて
製造した永久磁石は、その磁気特性が低い。- Horn: Due to the floating of the above oxides in the molten metal, the resulting powder may contain 500 ppm or more of oxygen. Permanent magnets manufactured using such oxygen-rich powders have poor magnetic properties.
従って、本発明の目的とするところは、溶湯中の希土類
元素が、溶湯保持容器や溶湯ノズルの耐火物を還元する
こと、及び溶湯中の酸素量が増加することを防止し、希
土類酸化物が生成しにくい希土類−Ｆｅ−Ｂ系永久磁石
用合金粉末の製造方法を提供することである。Therefore, the object of the present invention is to prevent rare earth elements in the molten metal from reducing the refractories in the molten metal holding container and molten metal nozzle, and to prevent the amount of oxygen in the molten metal from increasing. An object of the present invention is to provide a method for producing rare earth-Fe-B alloy powder for permanent magnets, which is difficult to produce.
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Ｒ８〜２５％（ＲはＹを含む希土類元
素の一種あるいは二種以」―を組み合わせて用いる）、
８２〜１２％、残部が鉄及びその他製造上不可避な不純
物からなる合金の溶湯に、Ｃａ又はＣａを含む金属を添
加し、上記溶湯中のＣａ溶解量が１〜１００ ｐｐｍに
なるようにして、−に記溶湯をＣａＯ質又はＹ２Ｏ３質
の耐火物を用いた溶湯保持容器及び溶湯ノズルを経て噴
出させ、これに不活性冷却ガスを吹き付け永久磁石用合
金粉末を得る点である。The main means adopted by the present invention to achieve the above object is R8 to 25% in atomic percentage (R is a combination of one or more rare earth elements including Y),
Ca or a metal containing Ca is added to a molten metal of an alloy consisting of 82% to 12%, the balance being iron and other impurities unavoidable in manufacturing, and the amount of Ca dissolved in the molten metal is 1 to 100 ppm, - The molten metal is ejected through a molten metal holding container and a molten metal nozzle using a CaO-based or Y2O3-based refractory, and an inert cooling gas is blown onto the molten metal to obtain an alloy powder for a permanent magnet.
即ち、合金き溶湯にＣａ又はＣａを含む金属を添加する
ことにより、酸素をＣａＯとして生成浮上さゼることか
でき、溶湯中の酸素量が低減する。That is, by adding Ca or a metal containing Ca to the alloyed molten metal, oxygen can be generated and floated as CaO, thereby reducing the amount of oxygen in the molten metal.
よって希土類酸化物の生成を防止することができる。Therefore, generation of rare earth oxides can be prevented.
更に、熱的に安定で、希土類元素と熱力学的に還元の殆
どおこらないＣａＯ質又はＹ２Ｏ，質の耐火物を溶湯保
持容器及び溶湯ノズルに用いることにより、希土類酸化
物の生成が一層おこりにくくなる。また特に、前者のＣ
ａＯ質の耐火物を用いた場合、溶湯中の介在物やＳ等を
吸収するため、磁気特性や機械的性質に優れた永久磁石
用合金粉末を得ることができる。Furthermore, by using CaO or Y2O refractories, which are thermally stable and hardly thermodynamically reduce with rare earth elements, for the molten metal holding container and molten metal nozzle, the generation of rare earth oxides is even less likely to occur. Become. In particular, the former C
When an aO refractory is used, it absorbs inclusions, S, etc. in the molten metal, so it is possible to obtain an alloy powder for permanent magnets with excellent magnetic properties and mechanical properties.
ここで、溶湯中のＣａ溶解量を１〜１００ ｐｐｍとし
たのは、１ ｐｐｍより少ないと溶湯中の酸素を効果的
に低減させることができず、１００ｐｐｎ＋より多くな
ると磁気特性の低下をきたすためである。Here, the amount of Ca dissolved in the molten metal was set to 1 to 100 ppm because if it is less than 1 ppm, oxygen in the molten metal cannot be effectively reduced, and if it is more than 100 ppn+, the magnetic properties will deteriorate. It is.
また、雰囲気圧力Ｐを０．３〜９．Ｏａｔｍとしたのは
、０．３ａｔｍより小さいとＣａ処理した溶湯中のＣａ
が揮発して効果が低くなり、９．Ｏａｔｍより大きくな
ると高圧容器が必要となり実用上好ましくないからであ
る。更に得られる永久磁石用合金粉末の粒径を３０μｍ
以上としたのは、ごの粉末を用いて焼結磁石を製造する
際、この粉末を粉砕して磁気配向させる面から、粉末中
の結晶粒の大きさを５μｍ以上としたいためである。In addition, the atmospheric pressure P was set to 0.3 to 9. Oatm is defined as Ca in the molten metal treated with Ca when it is less than 0.3 atm.
9. Volatizes and becomes less effective. This is because if it is larger than Oatm, a high-pressure container will be required, which is not practical. Furthermore, the particle size of the obtained alloy powder for permanent magnets was reduced to 30 μm.
The reason for this is that when producing a sintered magnet using iron powder, the size of crystal grains in the powder is desired to be 5 μm or more in order to achieve magnetic orientation by pulverizing the powder.
ＣａＯ質の耐火物を用いた溶湯保持容器内で、１３ａｔ
％Ｎｄ−］、５ａｔ％Ｄｙ−１，６ａＬ％Ｂ−ＦｅＢａ
Ｉ！の組成の合金を溶融し、これに溶湯中のＣａン容解
景がそれぞれ１５．１８．２０．３０ｐｐｍになるよう
にＣａを添加し、ＣａＯ質及びＹ２Ｏ３質の耐火物を用
いた溶湯ノズルから噴出さセで、これにアトマイズガス
圧力４０ｋｇ／ｃ＋ＩＩの不活性冷却ガスを吹き付けて
永久磁石用合金粉末を得た結果と、比較例として、Ｍｇ
Ｏ質の耐火物を用いた溶湯保持容器内で、１３ａｔ％Ｎ
ｄ １．５ａｔ％Ｄｙ７．６ａｔ％Ｂ−Ｆ ｅ Ｂ
ａ ｐ、の組成の合金を溶融し、これを／１２０．質の
耐火物を用いた溶湯ノズルから噴出させて、アトマイズ
ガス圧力４０ｋｇ／ｃｉの不活性冷却ガスを吹き付けて
永久磁石用合金粉末を得た結果を表１に示す。ここで、
粉末粒度の範囲とは、得られた永久磁石用合金粉末の累
積粒度分布の１０〜９０％の範囲の粉末粒径を示す。13at in a molten metal holding container made of CaO refractory.
%Nd-], 5at%Dy-1, 6aL%B-FeBa
I! An alloy with a composition of The results of obtaining alloy powder for permanent magnets by spraying an inert cooling gas with an atomizing gas pressure of 40 kg/c + II on this in the blowout chamber, and as a comparative example, Mg
In a molten metal holding container using O quality refractory, 13at%N
d 1.5at%Dy7.6at%B-F e B
An alloy having a composition of a p is melted and the alloy is melted to a composition of /120. Table 1 shows the results of obtaining alloy powder for permanent magnets by blowing inert cooling gas at an atomizing gas pressure of 40 kg/ci through a molten metal nozzle made of high-quality refractories. here,
The range of powder particle size refers to a powder particle size in a range of 10 to 90% of the cumulative particle size distribution of the obtained alloy powder for permanent magnets.
この結果から本発明法は、従来法に比べて溶解歩留が１
０〜１３％向−１ニし、且つ得られた永久磁石用合金粉
末の酸素量を低減することができることがわかる。These results show that the method of the present invention has a dissolution yield of 1% compared to the conventional method.
It can be seen that the amount of oxygen in the obtained alloy powder for permanent magnets can be reduced from 0 to 13%.
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基」二を組の合わせ
て用いる）、８２〜１２％、残部が鉄及びその他製造」
二不可避な不純物からなる合金の溶湯に、Ｃａ又はＣａ
を含む金属を添加し、上δ己？容湯中のＣａ？容解鼠が
１〜］００ｐｐｍになるようにして、上記溶湯をＣａＯ
質又はＹ、０．質の耐火物を用いた溶湯保持容器及び溶
湯ノズルを経°ζ噴出させ、これに不活性冷却ガスを吹
き付け永久磁石用合金粉末を得ることを特徴とする希土
類Ｆ ｅ −Ｂ系永久磁石用合金粉末の製造方法が提供
され、これにより溶湯中の酸素量の低減及び希土類酸化
物の生成を防止することができる。According to the present invention, the atomic percentage of R is 8 to 25% (R is one or two groups of rare earth elements including Y), 82 to 12%, and the balance is iron and other materials.
Ca or Ca is added to the molten alloy consisting of two inevitable impurities.
Adding metals containing δ? Ca in hot water? Add CaO to the molten metal so that the melting concentration is 1 to 00 ppm.
Quality or Y, 0. A rare earth Fe-B alloy for permanent magnets, which is characterized in that a molten metal holding container and a molten metal nozzle made of high-quality refractories are used to eject the molten metal over time, and an inert cooling gas is sprayed thereto to obtain alloy powder for permanent magnets. A method for producing a powder is provided, which can reduce the amount of oxygen in the molten metal and prevent the formation of rare earth oxides.
従って、溶湯保持容器及び溶湯ノズルの内壁に希土類酸
化物が付着成長することがなくなり、地金付きあるいは
ノズル径が見かけ上細くなったり、ノズル閉塞がおこる
といったことがなくなる。Therefore, rare earth oxides do not adhere to and grow on the inner walls of the molten metal holding container and the molten metal nozzle, and no metal buildup, apparent narrowing of the nozzle diameter, or nozzle clogging occurs.
そして、ノズル径の変化がなくなるため、得られる粉末
の粒度が一定し、所定の粒度分布範囲の粉末を製造する
ことができる。Further, since there is no change in the nozzle diameter, the particle size of the obtained powder is constant, and powder having a predetermined particle size distribution range can be manufactured.
また、溶湯中の酸素量を低減することができるため、磁
気特性の優れた永久磁石を製造することができる。Furthermore, since the amount of oxygen in the molten metal can be reduced, a permanent magnet with excellent magnetic properties can be manufactured.
Claims (2)
元素の一種あるいは二種以上を組み合わせて用いる）、
Ｂ２〜１２％、残部が鉄及びその他製造上不可避な不純
物からなる合金の溶湯に、Ｃａ又はＣａを含む金属を添
加し、上記溶湯中のＣａ溶解量が１〜１００ｐｐｍにな
るようにして、上記溶湯をＣａＯ質又はＹ＿２Ｏ＿３質
の耐火物を用いた溶湯保持容器及び溶湯ノズルを経て噴
出させ、これに不活性冷却ガスを吹き付け永久磁石用合
金粉末を得ることを特徴とする希土類−Ｆｅ−Ｂ系永久
磁石用合金粉末の製造方法。(1) R8 to 25% in atomic percentage (R is one type or a combination of two or more rare earth elements including Y),
Ca or a metal containing Ca is added to a molten metal of an alloy consisting of B2 to 12%, the balance being iron and other impurities unavoidable in manufacturing, and the amount of Ca dissolved in the molten metal is 1 to 100 ppm. A rare earth-Fe-B system characterized by ejecting molten metal through a molten metal holding container and a molten metal nozzle using a CaO-based or Y_2O_3-based refractory, and spraying an inert cooling gas onto the molten metal to obtain alloy powder for permanent magnets. A method for producing alloy powder for permanent magnets.
０ａｔｍの不活性ガス雰囲気内で得るようにした請求項
（１）記載の希土類−Ｆｅ−Ｂ系永久磁石用合金粉末の
製造方法。（３）上記永久磁石用合金粉末の粒径が３０
μｍ以上になるようにした希土類−Ｆｅ−Ｂ系永久磁石
用合金粉末の製造方法。(2) The molten metal of the above alloy is heated to an atmospheric pressure P of 0.3 to 9.
The method for producing rare earth-Fe-B alloy powder for permanent magnets according to claim 1, wherein the powder is obtained in an inert gas atmosphere of 0 atm. (3) The particle size of the above alloy powder for permanent magnets is 30
A method for producing a rare earth-Fe-B alloy powder for permanent magnets having a particle size of μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22713788A JPH0273905A (en) | 1988-09-09 | 1988-09-09 | Production of alloy powder for rare earth element-fe-b permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22713788A JPH0273905A (en) | 1988-09-09 | 1988-09-09 | Production of alloy powder for rare earth element-fe-b permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0273905A true JPH0273905A (en) | 1990-03-13 |
Family
ID=16856061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22713788A Pending JPH0273905A (en) | 1988-09-09 | 1988-09-09 | Production of alloy powder for rare earth element-fe-b permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0273905A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015019513A1 (en) * | 2013-08-09 | 2015-02-12 | Jx日鉱日石金属株式会社 | Process for manufacturing neodymium-iron-boron-based rare earth powder or sputtering target, neodymium-iron-boron-based rare earth powder or sputtering target, and neodymium-iron-boron-based thin film for rare earth magnet or manufacturing process therefor |
-
1988
- 1988-09-09 JP JP22713788A patent/JPH0273905A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015019513A1 (en) * | 2013-08-09 | 2015-02-12 | Jx日鉱日石金属株式会社 | Process for manufacturing neodymium-iron-boron-based rare earth powder or sputtering target, neodymium-iron-boron-based rare earth powder or sputtering target, and neodymium-iron-boron-based thin film for rare earth magnet or manufacturing process therefor |
| JPWO2015019513A1 (en) * | 2013-08-09 | 2017-03-02 | Ｊｘ金属株式会社 | Production method of rare earth powder or sputtering target mainly composed of neodymium, iron and boron, thin film for rare earth magnet mainly composed of neodymium, iron and boron, or production method thereof |
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