JP7243609B2 - 希土類焼結磁石 - Google Patents
希土類焼結磁石 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
- 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
- H01F1/0575—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
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Description
〔1〕
R(Rは希土類元素から選ばれる1種以上の元素であり、Ndを必須とする。)、T(Tは鉄族元素から選ばれる1種以上の元素であり、Feを必須とする。)、B、M1(M1はAl、Si、Cr、Mn、Cu、Zn、Ga、Ge、Mo、Sn、W、Pb、Biから選ばれる1種以上の元素である。)、及びM2(M2 はV、Zr、Nb、Hf、Taから選ばれる1種以上の元素である。)を含み、R2T14B相を主相とする希土類焼結磁石であって、上記M1を0.5~2.0原子%含み、かつ上記R、T、M2、Bの原子百分率をそれぞれ[R]、[T]、[M2]、[B]とした場合に、下記の関係式(1)を満足し、
([T]/14)+[M2]≦[B]≦([R]/2)+([M2]/2)・・・(1)
更に磁石中の全粒界相の0.1~10体積%が、R6T13M1相で占められていることを特徴とする希土類焼結磁石。
〔2〕
Rの含有量が12.5~16.0原子%、Bの含有量が5.5~8.0原子%、M1の含有量が0.5~2.0原子%、M2の含有量が0.5原子%以下である〔1〕の希土類焼結磁石。
〔3〕
O含有量が0.1質量%以下、N含有量が0.05質量%以下、C含有量が0.07質量%以下である〔1〕又は〔2〕の希土類焼結磁石。
〔4〕
平均結晶粒径が4μm以下である〔1〕~〔3〕のいずれかの希土類焼結磁石。
〔5〕
希土類焼結磁石の表面から少なくとも500μm以内において、上記主相粒子の表面近傍の少なくとも一部に、上記主相粒子の中心部よりもR1(R1は希土類元素から選ばれる1種以上の元素であり、上記Rの一部を構成する)濃度が高い領域が存在することを特徴とする〔1〕~〔4〕のいずれかの希土類焼結磁石。
〔6〕
上記R1の少なくとも一部は、焼結後の磁石に粒界拡散により導入されたものである〔1〕~〔5〕のいずれかの希土類焼結磁石。
([T]/14)+[M2]≦[B]≦([R]/2)+([M2]/2)・・・(1)
本発明の希土類焼結磁石を作製する工程は、基本的には、通常の粉末冶金法と同様であり、特に制限されるものではないが、通常は、原料を溶解して所定の組成を有する原料合金を得る溶解工程、原料合金を粉砕して合金微粉末を調製する粉砕工程、合金微粉末を磁場印加中で圧粉成形して成形体を得る成形工程、成形体を熱処理して焼結体を得る熱処理工程を含む。
Ndメタル、Prメタル、Dyメタル、フェロボロン合金、電解Co、Alメタル、Cuメタル、Gaメタル、Siメタル、Zrメタルおよび電解鉄を用いて(メタルはいずれも純度99%以上)、所定の割合となるように秤量・配合し、それらの原料を溶解してストリップキャスト法により鋳造し、厚み0.2~0.4mmのフレーク状の原料合金を得た。得られたフレーク状の原料合金を水素加圧雰囲気で水素脆化させることで粗粉砕粉を得た。次に、得られた粗粉砕粉に、潤滑剤としてステアリン酸を粗粉砕粉100質量%に対して0.20質量%添加・混合した後、気流式粉砕機(ジェットミル装置)を用いて窒素気流中で乾式粉砕し、微粉粒径(D50)が2.8~3.0μmとなる微粉砕粉(合金粉末)を得た。なお、微粉粒径(D50)は、気流分散法によるレーザー回折法で得られた体積基準メジアン径である。
実施例1と同様な手順で磁石の作製を行った。その際、表3に示したように、Nd量、Pr量を実施例1と比較して削減しFe量を増加させ、更にB量を表3に示すように変化させて磁石を作製した。得られた各磁石について、実施例1と同様にして、平均結晶粒径、R6T13M1相の占有率、M1含有量、Br、HcJを測定した。結果を表4に示す。なお、表4においても、本発明の規定を満たす項目は〇、満たさない項目は×として示す。
実施例1と同様な手順で磁石の作製を行った。その際、表5に示したように、Nd量、Pr量を実施例1と比較して削減しFe量を増加させた。得られた各磁石について、実施例1と同様にして、平均結晶粒径、R6T13M1相の占有率、M1含有量、Br、HcJを測定した。結果を表4に示す。なお、表4においても、本発明の規定を満たす項目は〇、満たさない項目は×として示す。
Claims (6)
- R(Rは希土類元素から選ばれる1種以上の元素であり、Ndを必須とする。)、T(Tは鉄族元素から選ばれる1種以上の元素であり、Feを必須とする。)、B、M1(M1はAl、Si、Cr、Mn、Cu、Zn、Ga、Ge、Mo、Sn、W、Pb、Biから選ばれる1種以上の元素である。)、及びM2(M2 はV、Zr、Nb、Hf、Taから選ばれる1種以上の元素である。)を含み、R2T14B相を主相とする希土類焼結磁石であって、上記M1を0.5~2.0原子%含み、かつ上記R、T、M2、Bの原子百分率をそれぞれ[R]、[T]、[M2]、[B]とした場合に、下記の関係式(1)を満足し、
([T]/14)+[M2]≦[B]≦([R]/2)+([M2]/2)・・・(1)
更に磁石中の全粒界相の0.1~10体積%が、R6T13M1相で占められていることを特徴とする希土類焼結磁石。 - Rの含有量が12.5~16.0原子%、Bの含有量が5.5~8.0原子%、M1の含有量が0.5~2.0原子%、M2の含有量が0.5原子%以下である請求項1記載の希土類焼結磁石。
- O含有量が0.1質量%以下、N含有量が0.05質量%以下、C含有量が0.07質量%以下である請求項1又は2記載の希土類焼結磁石。
- 平均結晶粒径が4μm以下である請求項1~3のいずれか1項に記載の希土類焼結磁石。
- 希土類焼結磁石の表面から少なくとも500μm以内において、上記主相粒子の表面近傍の少なくとも一部に、該主相粒子の中心部よりもR1(R1は、希土類元素から選ばれる1種以上の元素であり、上記Rの少なくとも一部を構成する)の濃度が高い領域が存在する請求項1~4のいずれか1項に記載の希土類焼結磁石。
- 上記R1は、焼結後の磁石に粒界拡散により導入されたものである請求項5記載の希土類焼結磁石。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2019225356A JP7243609B2 (ja) | 2019-12-13 | 2019-12-13 | 希土類焼結磁石 |
CN202080085849.7A CN114793465A (zh) | 2019-12-13 | 2020-12-07 | 稀土烧结磁体 |
EP20900196.5A EP4074856A4 (en) | 2019-12-13 | 2020-12-07 | SINTERED RARE EARTH MAGNET |
US17/781,621 US20220415551A1 (en) | 2019-12-13 | 2020-12-07 | Rare earth sintered magnet |
PCT/JP2020/045456 WO2021117672A1 (ja) | 2019-12-13 | 2020-12-07 | 希土類焼結磁石 |
TW109143575A TW202133199A (zh) | 2019-12-13 | 2020-12-10 | 稀土類燒結磁石 |
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JP2019225356A JP7243609B2 (ja) | 2019-12-13 | 2019-12-13 | 希土類焼結磁石 |
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JP7243609B2 true JP7243609B2 (ja) | 2023-03-22 |
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EP (1) | EP4074856A4 (ja) |
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Citations (5)
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JP2015179841A (ja) | 2014-02-28 | 2015-10-08 | 日立金属株式会社 | R−t−b系焼結磁石の製造方法 |
WO2016133080A1 (ja) | 2015-02-18 | 2016-08-25 | 日立金属株式会社 | R-t-b系焼結磁石の製造方法 |
JP2016164958A (ja) | 2014-09-29 | 2016-09-08 | 日立金属株式会社 | R−t−b系焼結磁石 |
JP2017157832A (ja) | 2016-02-26 | 2017-09-07 | Tdk株式会社 | R−t−b系永久磁石 |
JP2017157833A (ja) | 2016-02-26 | 2017-09-07 | Tdk株式会社 | R−t−b系永久磁石 |
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US8030935B2 (en) | 2004-10-15 | 2011-10-04 | Halliburton Energy Services, Inc. | Minimizing the effect of borehole current in tensor induction logging tools |
DE112013003109T5 (de) | 2012-06-22 | 2015-02-26 | Tdk Corp. | Gesinterter Magnet |
JP6177877B2 (ja) | 2013-03-12 | 2017-08-09 | インターメタリックス株式会社 | RFeB系焼結磁石の製造方法及びそれにより製造されるRFeB系焼結磁石 |
US10388441B2 (en) * | 2013-08-09 | 2019-08-20 | Tdk Corporation | R-T-B based sintered magnet and motor |
JP6693392B2 (ja) * | 2015-11-18 | 2020-05-13 | 信越化学工業株式会社 | R−(Fe,Co)−B系焼結磁石及びその製造方法 |
EP3503130B1 (en) * | 2016-08-17 | 2024-06-05 | Proterial, Ltd. | R-t-b sintered magnet |
JP2018056188A (ja) | 2016-09-26 | 2018-04-05 | 信越化学工業株式会社 | R−Fe−B系焼結磁石 |
JP6691666B2 (ja) * | 2016-10-06 | 2020-05-13 | 日立金属株式会社 | R−t−b系磁石の製造方法 |
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JP2016164958A (ja) | 2014-09-29 | 2016-09-08 | 日立金属株式会社 | R−t−b系焼結磁石 |
WO2016133080A1 (ja) | 2015-02-18 | 2016-08-25 | 日立金属株式会社 | R-t-b系焼結磁石の製造方法 |
JP2017157832A (ja) | 2016-02-26 | 2017-09-07 | Tdk株式会社 | R−t−b系永久磁石 |
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US20220415551A1 (en) | 2022-12-29 |
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