JP2015119130A - 希土類磁石 - Google Patents
希土類磁石 Download PDFInfo
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- JP2015119130A JP2015119130A JP2013263366A JP2013263366A JP2015119130A JP 2015119130 A JP2015119130 A JP 2015119130A JP 2013263366 A JP2013263366 A JP 2013263366A JP 2013263366 A JP2013263366 A JP 2013263366A JP 2015119130 A JP2015119130 A JP 2015119130A
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- Prior art keywords
- rare earth
- grain boundary
- boundary phase
- earth magnet
- elements
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- 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.)
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Classifications
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- 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
-
- 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
- H01F1/0575—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
Abstract
Description
R:25〜35%、
T:60〜70%、
M:2〜10%、
の範囲でR、T及びM元素を少なくとも含有する粒界相を含むことを特徴とする。このように構成することで、高温減磁率の絶対値を4%以下に抑制できる。
(MはAl、Ge、Si、Sn、Gaから選ばれる少なくとも一種)
[R]/[M]<10、及び
[T]/[M]<30、
となる関係を満たすと良く、前記R、T及びM元素を少なくとも含有する粒界相の構成元素の比率をこのように構成することで、高温減磁率の絶対値を3%以内に抑制できる。
R:25〜35%、
T:60〜70%、
M:2〜10%、
の範囲でR、T及びM元素を少なくとも含有する粒界相を含むことを特徴とする。
R:29.5〜33質量%
B:0.7〜0.95質量%
M:0.03〜1.5質量%
Cu:0.01〜1.5質量%、及び、
Fe:実質的に残部、及び、
残部を占める元素のうちのFe以外の元素の合計含有量:5質量%以下。
D=(B1−B0)/B0*100(%)
と、評価される。尚、本明細書で高温減磁率が小さいとは、上式で計算される高温減磁率の絶対値が小さいことを意味する。
]、[O]、[N]、[Nd]、[Pr]、[B]及び[M]としたとき、各試料の[O]/([C]+[N])、[B]/([Nd]+[Pr])及び([M]+[C])/[B]の値を算出し、表3に示した。
2 二粒子粒界相
3 粒界相
Claims (8)
- R2T14B主相結晶粒子と、粒界相とを含む希土類磁石において、前記粒界相が、R、T及びM元素数の相対的な割合として、
R:25〜35%、
T:60〜70%、
M:2〜10%、
の範囲でR、T及びM元素を少なくとも含有する粒界相を含むことを特徴とする希土類磁石。
(但し、Rは希土類元素、TはFeを必須元素とした一種以上の鉄族元素、MはAl、Ge、Si、Sn、Gaから選ばれる少なくとも一種の元素をそれぞれ示す。) - 前記R、T及びM元素を少なくとも含有する粒界相が、R、T、及びMの原子数を、それぞれ[R]、[T]、及び[M]としたとき、
[R]/[M]<10、及び
[T]/[M]<30、
となる関係を満たす、請求項1に記載の希土類磁石。 - 前記R、T及びM元素を少なくとも含有する粒界相が、R−T−M系化合物であることを特徴とする請求項1に記載の希土類磁石。
- 任意の断面において、前記粒界相の前記R−T−M系化合物に含まれるT元素の原子濃度が50%以上80%以下であり、該R−T−M系化合物の面積比率が、0.1%以上であり、20%未満であること特徴とする、請求項1に記載の希土類磁石。
- 前記R−T−M系化合物は、正方晶の結晶系に属する結晶であることを特徴とする請求項1に記載の希土類磁石。
- 前記R−T−M系化合物は、体心正方格子を有する結晶であることを特徴とする請求項1に記載の希土類磁石。
- 前記R−T−M系化合物は、その単位格子のc軸長が21〜23Åであることを特徴とする請求項1に記載の希土類磁石。
- 前記R−T−M系化合物は、La6Co11Ga3型結晶構造を有することを特徴とする請求項1に記載の希土類磁石。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013263366A JP6142792B2 (ja) | 2013-12-20 | 2013-12-20 | 希土類磁石 |
DE102014119040.8A DE102014119040B4 (de) | 2013-12-20 | 2014-12-18 | Seltenerdbasierter Magnet |
CN201410804193.6A CN104733147B (zh) | 2013-12-20 | 2014-12-19 | 稀土类磁铁 |
US14/578,621 US10256016B2 (en) | 2013-12-20 | 2014-12-22 | Rare earth based magnet |
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JP2013263366A JP6142792B2 (ja) | 2013-12-20 | 2013-12-20 | 希土類磁石 |
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JP2015119130A true JP2015119130A (ja) | 2015-06-25 |
JP6142792B2 JP6142792B2 (ja) | 2017-06-07 |
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Country Status (4)
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US (1) | US10256016B2 (ja) |
JP (1) | JP6142792B2 (ja) |
CN (1) | CN104733147B (ja) |
DE (1) | DE102014119040B4 (ja) |
Cited By (1)
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---|---|---|---|---|
JP2018019079A (ja) * | 2016-07-15 | 2018-02-01 | Tdk株式会社 | R−t−b系希土類永久磁石 |
Families Citing this family (8)
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JP6142794B2 (ja) * | 2013-12-20 | 2017-06-07 | Tdk株式会社 | 希土類磁石 |
JP6142793B2 (ja) * | 2013-12-20 | 2017-06-07 | Tdk株式会社 | 希土類磁石 |
DE102015223542A1 (de) * | 2015-11-27 | 2017-06-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Anreicherung eines Elementes an den Korngrenzen eines magnetischen zwei- oder mehrphasigen Systems |
JP6926861B2 (ja) * | 2017-09-08 | 2021-08-25 | Tdk株式会社 | R−t−b系永久磁石 |
CN108878090B (zh) * | 2018-06-25 | 2020-05-12 | 天津三环乐喜新材料有限公司 | 一种无重稀土的钕铁硼烧结磁体及其制备方法 |
US11232890B2 (en) | 2018-11-06 | 2022-01-25 | Daido Steel Co., Ltd. | RFeB sintered magnet and method for producing same |
CN111009369B (zh) * | 2019-10-29 | 2021-08-27 | 厦门钨业股份有限公司 | 一种稀土永磁材料及其制备方法和应用 |
CN111378907A (zh) * | 2020-04-08 | 2020-07-07 | 甘肃稀土新材料股份有限公司 | 一种提高钕铁硼永磁材料矫顽力的辅助合金及应用方法 |
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Also Published As
Publication number | Publication date |
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DE102014119040B4 (de) | 2018-09-06 |
JP6142792B2 (ja) | 2017-06-07 |
CN104733147B (zh) | 2018-01-26 |
US10256016B2 (en) | 2019-04-09 |
DE102014119040A1 (de) | 2015-06-25 |
CN104733147A (zh) | 2015-06-24 |
US20150179317A1 (en) | 2015-06-25 |
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