JP2017183710A - R−t−b系永久磁石 - Google Patents
R−t−b系永久磁石 Download PDFInfo
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Abstract
Description
Rが希土類元素,TがFeまたはFeおよびCoを必須とする鉄族元素,Bがホウ素であり、
隣接する二つの前記主相結晶粒子間の二粒子粒界を含み、前記主相結晶粒子の平均粒径が0.9μm以上2.8μm以下であり、前記二粒子粒界厚みが5nm以上200nm以下であることを特徴とする。
Rの含有量が29.5質量%以上35.0質量%以下、Bの含有量が0.70質量%以上0.95質量%以下、Gaの含有量が0.05質量%以上1.5質量%以下であってもよい。
Alの含有量が0.03質量%以上0.4質量%以下であってもよい。
Cuの含有量が0.05質量%以上1.5質量%以下であってもよい。
Zrの含有量が0.05質量%以上2.5質量%以下であってもよい。
<R−T−B系永久磁石の製造方法>
まず、R−T−B系永久磁石の原料金属を準備し、表1に示す組成Aを有するR−T−B系永久磁石が得られるように、ストリップキャスティング法により、原料合金を準備した。なお、表1ではbal.は各合金の全体組成を100質量%とした場合の残りを示し、T.REは希土類の合計質量%を示す。
表1に示す組成BのR−T−B系永久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、原料合金の鋳造、水素粉砕処理を行った。
表1に示す組成CのR−T−B系永久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、原料合金の鋳造、水素粉砕処理を行った。
4 粒界相
6 二粒子粒界
6a、6b 境界
8 粒界三重点
Claims (7)
- R−T−B系化合物を主相結晶粒子として含むR−T−B系永久磁石であって、
Rが希土類元素,TがFeまたはFeおよびCoを必須とする鉄族元素,Bがホウ素であり、
隣接する二つの前記主相結晶粒子間の二粒子粒界を含み、前記主相結晶粒子の平均粒径が0.9μm以上2.8μm以下であり、前記二粒子粒界厚みが5nm以上200nm以下であることを特徴とするR−T−B系永久磁石。 - 前記R−T−B系永久磁石の任意の切断面において、粒径が0.6μm以下である前記主相結晶粒子の面積率が5%以下であることを特徴とする、請求項1記載のR−T−B系永久磁石。
- さらにGaを含有し、
Rの含有量が29.5質量%以上35.0質量%以下、Bの含有量が0.70質量%以上0.95質量%以下、Gaの含有量が0.05質量%以上1.5質量%以下である請求項1または2に記載のR−T−B系永久磁石。 - さらにAlを含有し、
Alの含有量が0.03質量%以上0.4質量%以下である請求項1〜3のいずれかに記載のR−T−B系永久磁石。 - さらにCuを含有し、
Cuの含有量が0.05質量%以上1.5質量%以下である請求項1〜4のいずれかに記載のR−T−B系永久磁石。 - Coの含有量が0.1質量%以上4質量%以下である請求項1〜5のいずれかに記載のR−T−B系永久磁石。
- さらにZrを含有し、
Zrの含有量が0.05質量%以上2.5質量%以下である請求項1〜6のいずれかに記載のR−T−B系永久磁石。
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US (1) | US10529473B2 (ja) |
JP (1) | JP2017183710A (ja) |
CN (1) | CN107240468B (ja) |
DE (1) | DE102017203072A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2020161614A (ja) * | 2019-03-26 | 2020-10-01 | 日立金属株式会社 | R−t−b系焼結磁石の製造方法 |
JP2021034711A (ja) * | 2019-08-16 | 2021-03-01 | 包頭天和磁気材料科技股▲ふん▼有限公司 | 焼結体、焼結永久磁石およびそれらの製造方法 |
JP2021150621A (ja) * | 2020-03-23 | 2021-09-27 | Tdk株式会社 | R−t−b系希土類焼結磁石およびr−t−b系希土類焼結磁石の製造方法 |
JP2021158205A (ja) * | 2020-03-26 | 2021-10-07 | Tdk株式会社 | R‐t‐b系永久磁石 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3579257A4 (en) * | 2017-01-31 | 2020-02-19 | Hitachi Metals, Ltd. | PROCESS FOR PRODUCING R-T-B SINTERED MAGNET |
WO2020184565A1 (ja) * | 2019-03-13 | 2020-09-17 | Tdk株式会社 | R-t-b系永久磁石およびその製造方法 |
JP7387992B2 (ja) * | 2019-03-20 | 2023-11-29 | Tdk株式会社 | R-t-b系永久磁石 |
CN111243812B (zh) * | 2020-02-29 | 2022-04-05 | 厦门钨业股份有限公司 | 一种r-t-b系永磁材料及其制备方法和应用 |
JP7484684B2 (ja) * | 2020-12-07 | 2024-05-16 | 富士通株式会社 | 測定装置、測定方法および測定プログラム |
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CN107240468B (zh) | 2019-06-07 |
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