JP6848736B2 - R−t−b系希土類永久磁石 - Google Patents
R−t−b系希土類永久磁石 Download PDFInfo
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- H01F1/053—Alloys characterised by their composition containing rare earth metals
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- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
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- H01F1/0575—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 pressed, sintered or bonded together
- H01F1/0577—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 pressed, sintered or bonded together sintered
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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Description
本発明は組成式が、
(R11−x(Y1−yーzCeyLaz)x)aTbBcMdで表され、
(但し、R1は、Y、Ce、Laを含まない1種以上の希土類元素、TはFeまたはFeおよびCoを必須とする1種以上の遷移金属、
MはGa、または、GaとSn、Bi、Siの1種以上とからなる元素であり、)
0.4≦x≦0.7、0.00≦y+z≦0.20、0.16≦a/b≦0.28、0.050≦c/b≦0.075、0.005≦d/b≦0.028
からなるR−T−B系希土類永久磁石であって、
前記R−T−B系希土類永久磁石は、R2T14B型正方晶構造を有する化合物からなる主相と粒界相を含み、
前記主相結晶粒子の平均結晶粒径は、D50≦4.00μm、
粒度分布が(D90−D10)/D50≦1.60の関係式を満たし、
(但し、D10、D50、D90は、任意の断面における主相結晶粒子の断面積の累積分布が10%、50%、90%となる面積円相当径)
さらに前記粒界相の被覆率が70.0%以上であるR−T−B系希土類永久磁石であることを特徴とする。
(R11−x(Y1−yーzCeyLaz)x)aTbBcMdで表され、
(但し、R1は、Y、Ce、Laを含まない1種以上の希土類元素TはFeまたはFeおよびCoを必須とする1種以上の遷移金属、
MはGa、または、GaとSn、Bi、Siの1種以上とからなる元素であり、) 0.4≦x≦0.7、0.00≦y+z≦0.20、0.16≦a/b≦0.28、0.050≦c/b≦0.075、0.005≦d/b≦0.028
からなるR−T−B系希土類永久磁石であって、前記R−T−B系希土類永久磁石は、R2T14B型正方晶構造を有する化合物からなる主相と粒界相を含む。
本実施形態のR−T−B系希土類永久磁石の製造においては、まず、本発明で用いる組成)を有するR−T−B系磁石が得られるような原料合金を準備する。原料合金は、真空又は不活性ガス、望ましくはAr雰囲気中でストリップキャスト法、その他公知の溶解法により作製することができる。
H_50%Js/HcJ_Hmag
をもってマイナー曲線平坦性の指標とする。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、それらの原料を溶解したのち、ストリップキャスト法により鋳造して、フレーク状の原料合金を得た。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、実験例1と同様にして、それぞれの組成について、原料合金の鋳造、水素粉砕処理、ジェットミルによる微粉砕、成形、焼結、時効処理を行った。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、実験例1と同様にして、それぞれの組成について、原料合金の鋳造、水素粉砕処理、ジェットミルによる微粉砕、成形、焼結、時効処理を行った。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、実験例1と同様にして、それぞれの組成について、原料合金の鋳造、水素粉砕処理、ジェットミルによる微粉砕、成形、焼結、時効処理を行った。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、実験例1と同様にして、それぞれの組成について、原料合金の鋳造、水素粉砕処理、ジェットミルによる微粉砕、成形、焼結、時効処理を行った。
表1の実験例3で水素粉砕処理まで行った粗粉砕粉末に、粉砕助剤として、ラウリル酸アミド0.1質量%を添加した後、ジェットミルを用いて微粉砕を行った。微粉砕に際しては、微粉砕粉末の平均粒径が、実験例30では1.0μm、実験例31では1.4μm、実験例32では1.9μm、実験例33では1.7μm、実験例34では2.7μm、実験例35では4.7μmとなるように、ジェットミルの分級条件を調節した。微粉砕工程後、回収した各微粉砕粉末を再びジェットミルに投入して更に精密に分級した。
表1の実験例3で鋳造した原料合金に対して、実験例36、37では、室温で水素を吸蔵させた後、Ar雰囲気で300℃での1時間の熱処理の後、一旦室温まで冷却し、真空雰囲気で再び300℃での1時間の熱処理を行う水素粉砕処理を行った。実験例38では、水素粉砕処理を行わず、スタンプミルにて機械的粗粉砕を行った。
表1に示す組成のR−T−B系焼結磁石が得られるように原料を配合し、実験例2〜4と同様にして、それぞれの組成について、原料合金の鋳造、水素粉砕処理、ジェットミルによる微粉砕、成形、焼結、時効処理を行った。
Claims (2)
- 組成式が、
(R11−x(Y1−yーzCeyLaz)x)aTbBcMdで表され、
(但し、R1は、Y、Ce、Laを含まない1種以上の希土類元素、TはFeまたはFeおよびCoを必須とする1種以上の遷移金属、
MはGa、または、GaとSn、Bi、Siの1種以上とからなる元素であり、)0.4≦x≦0.7、0.00≦y+z≦0.20、0.16≦a/b≦0.28、0.050≦c/b≦0.075、0.005≦d/b≦0.028
からなるR−T−B系希土類永久磁石であって、
前記R−T−B系希土類永久磁石は、R2T14B型正方晶構造を有する化合物からなる主相と粒界相を含み、
前記主相結晶粒子の平均結晶粒径は、D50≦4.00μm、
粒度分布が(D90−D10)/D50≦1.60の関係式を満たす、
(但し、D10、D50、D90は、任意の断面における主相結晶粒子の断面積の累積分布が10%、50%、90%となる面積円相当径)
さらに前記粒界相の被覆率が70.0%以上であることを特徴する、R−T−B系希土類永久磁石。 - 前記主相結晶粒子の平均結晶粒径がD50≦3.00μm、粒度分布が(D90−D10)/D50≦1.20の関係式を満たし、
さらに前記粒界相の被覆率が90.0%以上であることを特徴とする、請求項1に記載のR−T−B系希土類永久磁石。
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JP7222359B2 (ja) * | 2018-01-30 | 2023-02-15 | Tdk株式会社 | R-t-b系希土類永久磁石 |
US11219949B2 (en) * | 2018-04-25 | 2022-01-11 | Central South University | Method for promoting densification of metal body by utilizing metal expansion induced by hydrogen absorption |
DE112019002738T5 (de) | 2018-05-29 | 2021-02-18 | Tdk Corporation | Magnet, Motor und Generator auf R-T-B-Basis |
JP7387992B2 (ja) * | 2019-03-20 | 2023-11-29 | Tdk株式会社 | R-t-b系永久磁石 |
CN113950728B (zh) * | 2019-06-18 | 2023-07-04 | 三菱电机株式会社 | 稀土烧结磁铁及使用其的旋转电机 |
JP7303157B2 (ja) * | 2020-06-01 | 2023-07-04 | トヨタ自動車株式会社 | 希土類磁石及びその製造方法 |
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US304A (en) * | 1837-07-29 | David w | ||
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US604A (en) * | 1838-02-15 | Improvement in plows | ||
JPS5946008A (ja) | 1982-08-21 | 1984-03-15 | Sumitomo Special Metals Co Ltd | 永久磁石 |
JP2002164239A (ja) * | 2000-09-14 | 2002-06-07 | Hitachi Metals Ltd | 希土類焼結磁石の製造方法およびリング磁石およびアークセグメント磁石 |
JP3489741B2 (ja) * | 2000-10-04 | 2004-01-26 | 住友特殊金属株式会社 | 希土類焼結磁石およびその製造方法 |
CN1306527C (zh) * | 2001-12-18 | 2007-03-21 | 昭和电工株式会社 | 用于稀土磁体的合金薄片及其生产方法、用于稀土烧结磁体的合金粉末、稀土烧结磁体、用于结合磁体的合金粉末和结合磁体 |
US6979409B2 (en) * | 2003-02-06 | 2005-12-27 | Magnequench, Inc. | Highly quenchable Fe-based rare earth materials for ferrite replacement |
JP2004303909A (ja) * | 2003-03-31 | 2004-10-28 | Tdk Corp | 希土類永久磁石の製造方法、希土類永久磁石 |
JP2010034522A (ja) | 2008-06-23 | 2010-02-12 | Toshiba Corp | 永久磁石およびその製造方法、モータ用永久磁石および永久磁石モータ |
US20110057756A1 (en) * | 2009-09-04 | 2011-03-10 | Electron Energy Corporation | Rare Earth Composite Magnets with Increased Resistivity |
JP6089535B2 (ja) | 2011-10-28 | 2017-03-08 | Tdk株式会社 | R−t−b系焼結磁石 |
EP2889883B1 (en) * | 2012-08-27 | 2017-03-08 | Intermetallics Co., Ltd. | Ndfeb-based sintered magnet |
US9953751B2 (en) * | 2013-03-22 | 2018-04-24 | Tdk Corporation | R-T-B based permanent magnet |
US10388441B2 (en) * | 2013-08-09 | 2019-08-20 | Tdk Corporation | R-T-B based sintered magnet and motor |
CN103545079A (zh) * | 2013-09-30 | 2014-01-29 | 赣州诚正有色金属有限公司 | 双主相含钇永磁磁体及其制备方法 |
JP5686214B1 (ja) * | 2014-03-28 | 2015-03-18 | Tdk株式会社 | R−t−b系永久磁石 |
JP6269279B2 (ja) | 2014-04-15 | 2018-01-31 | Tdk株式会社 | 永久磁石およびモータ |
JP5729511B1 (ja) | 2014-04-21 | 2015-06-03 | Tdk株式会社 | R−t−b系永久磁石、及び、回転機 |
CN106575556A (zh) * | 2014-08-18 | 2017-04-19 | 因太金属株式会社 | RFeB系烧结磁体 |
JP6489052B2 (ja) * | 2015-03-31 | 2019-03-27 | 信越化学工業株式会社 | R−Fe−B系焼結磁石及びその製造方法 |
JP6848735B2 (ja) * | 2016-07-15 | 2021-03-24 | Tdk株式会社 | R−t−b系希土類永久磁石 |
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US10566117B2 (en) | 2020-02-18 |
CN107622853A (zh) | 2018-01-23 |
US20180040400A1 (en) | 2018-02-08 |
DE102017115769A1 (de) | 2018-01-18 |
CN107622853B (zh) | 2019-09-20 |
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