JPWO2014034650A1 - NdFeB系焼結磁石 - Google Patents
NdFeB系焼結磁石 Download PDFInfo
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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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- H01F1/0577—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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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- 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
- H01F1/06—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 in the form of particles, e.g. powder
- H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
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- 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
- H01F1/06—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 in the form of particles, e.g. powder
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- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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Abstract
Description
このプレスレス法では、磁気配向等の磁石製造プロセスにおいて大型プレス等を用いる必要がないため、全体を無酸素雰囲気等の特定の雰囲気下で行うことが容易となる。実際、特許文献1ではそのような工程が開示されており、これにより、結晶粒の粒径を小さくし、且つ、酸化による影響を防止することができるため、保磁力HcJが高いNdFeB系焼結磁石を作製することが可能となっている。
NdFeB系焼結磁石を製造する際には、焼結工程においてキュリー温度(約310℃)よりも高い温度(1000℃前後)に加熱するため、焼結工程を経て得られた焼結体全体では磁化が消失している。そのため、得られた焼結体に磁界を印加することにより、焼結体を磁化させる処理が行われる。このような処理を「着磁」と呼ぶ。NdFeB系焼結磁石は、「核生成型」と呼ばれる保磁力メカニズムに起因して、熱消磁状態から外部磁界を強めるに従って急速に磁化が大きくなるという特徴を有するため、一般的には、「ピンニング型」と呼ばれる保磁力メカニズムを有するSmCo系焼結磁石よりも低い20kOe程度の磁界で着磁する。しかし、上記のように残留磁束密度Brを低下させることなく保磁力HcJを高めるために結晶粒の粒径を小さくすると、着磁特性が悪化するという問題点が顕著となる。
前記c軸に垂直な断面における結晶粒の粒径の中央値が4.5μm以下であり、
前記断面における、前記粒径が1.8μm以下である結晶粒の面積率が5%以下である
ことを特徴とする。
第1の方法は、原料の合金粉末における希土類元素の含有率によって調整するものである。具体的には、前記含有率を多くするほど、前記面積率を小さくすることができる。これにより、結晶粒の粒界において、希土類の含有率が周囲よりも高い希土類リッチ相の量が多くなり、それにより、焼結時において、微小な結晶粒がそれよりも大きい結晶粒に吸収されやすくなるため、微小な結晶粒の比率が小さくなると考えられる。このような含有率の調整は予備実験により行うことができる。本願発明者が行った予備実験では、希土類元素の含有率を31重量%以上としたときに、粒径が1.8μm以下である結晶粒の占める面積率を5%以下にすることができた。その詳細は本願実施例として後述する。
11…多磁区粒子
12…単磁区粒子
13…多磁区粒子に形成される磁区
14…単磁区粒子に形成される逆磁区
Claims (7)
- c軸が1方向に配向したNdFeB系焼結磁石であって、
前記c軸に垂直な断面における結晶粒の粒径の中央値が4.5μm以下であり、
前記断面における、前記粒径が1.8μm以下である結晶粒の面積率が5%以下である
ことを特徴とするNdFeB系焼結磁石。 - c軸が1方向に配向したNdFeB系焼結磁石であって、
前記c軸に垂直な断面における結晶粒の粒径の中央値が4.5μm以下であり、
前記断面における、前記粒径が1.6μm以下である結晶粒の面積率が2%以下である
ことを特徴とするNdFeB系焼結磁石。 - 希土類元素の含有率が31重量%以上であることを特徴とする請求項1又は2に記載のNdFeB系焼結磁石。
- 融点が700℃以下である金属の元素を1種又は2種以上含有していることを特徴とする請求項1〜3のいずれかに記載のNdFeB系焼結磁石。
- 前記金属元素がAl, Mg, Zn, Ga, In, Sn, Sb, Te, Pb, Biのうち1種又は2種以上であることを特徴とする請求項4に記載のNdFeB系焼結磁石。
- 前記金属元素がGaであることを特徴とする請求項5に記載のNdFeB系焼結磁石。
- 請求項1〜6のいずれかに記載のNdFeB系焼結磁石を基材として、粒界拡散処理が行われていることを特徴とするNdFeB系焼結磁石。
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JP2012186584 | 2012-08-27 | ||
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PCT/JP2013/072842 WO2014034650A1 (ja) | 2012-08-27 | 2013-08-27 | NdFeB系焼結磁石 |
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JP (1) | JP6186363B2 (ja) |
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EP2977999A4 (en) * | 2013-03-18 | 2016-03-16 | Intermetallics Co Ltd | PROCESS FOR PRODUCING RFEB-BASED MAGNETS AND RFEB-BASED FRITTED MAGNETS |
WO2014148353A1 (ja) * | 2013-03-18 | 2014-09-25 | インターメタリックス株式会社 | RFeB系磁石製造方法、RFeB系磁石及び粒界拡散処理用塗布物 |
US10529473B2 (en) * | 2016-03-28 | 2020-01-07 | Tdk Corporation | R-T-B based permanent magnet |
JP6848736B2 (ja) * | 2016-07-15 | 2021-03-24 | Tdk株式会社 | R−t−b系希土類永久磁石 |
JP2019102707A (ja) | 2017-12-05 | 2019-06-24 | Tdk株式会社 | R−t−b系永久磁石 |
CN108538561B (zh) * | 2018-03-01 | 2020-08-18 | 麦格昆磁磁性材料(滁州)有限公司 | 一种粘结钕铁硼磁体及制备方法 |
JP7196468B2 (ja) * | 2018-08-29 | 2022-12-27 | 大同特殊鋼株式会社 | R-t-b系焼結磁石 |
CN111223624B (zh) * | 2020-02-26 | 2022-08-23 | 福建省长汀金龙稀土有限公司 | 一种钕铁硼磁体材料、原料组合物及制备方法和应用 |
CN111223625B (zh) * | 2020-02-26 | 2022-08-16 | 福建省长汀金龙稀土有限公司 | 钕铁硼磁体材料、原料组合物及制备方法和应用 |
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JP2005197662A (ja) * | 2004-10-18 | 2005-07-21 | Tdk Corp | R−t−b系希土類永久磁石 |
WO2008032426A1 (en) * | 2006-09-15 | 2008-03-20 | Intermetallics Co., Ltd. | PROCESS FOR PRODUCING SINTERED NdFeB MAGNET |
JP2012060139A (ja) * | 2011-10-12 | 2012-03-22 | Inter Metallics Kk | NdFeB系焼結磁石の製造方法 |
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JP3332405B2 (ja) * | 1992-03-30 | 2002-10-07 | 株式会社東芝 | 永久磁石材料およびそれを用いた樹脂結合磁石 |
JP4879503B2 (ja) | 2004-04-07 | 2012-02-22 | 昭和電工株式会社 | R−t−b系焼結磁石用合金塊、その製造法および磁石 |
US7594972B2 (en) | 2004-04-07 | 2009-09-29 | Showda Denko K.K. | Alloy lump for R-T-B type sintered magnet, producing method thereof, and magnet |
JP4391897B2 (ja) | 2004-07-01 | 2009-12-24 | インターメタリックス株式会社 | 磁気異方性希土類焼結磁石の製造方法及び製造装置 |
JP4879843B2 (ja) | 2007-08-20 | 2012-02-22 | インターメタリックス株式会社 | NdFeB系焼結磁石の製造方法およびNdFeB焼結磁石製造用モールド |
JP4902677B2 (ja) | 2009-02-02 | 2012-03-21 | 株式会社日立製作所 | 希土類磁石 |
WO2012008623A1 (ja) | 2010-07-16 | 2012-01-19 | トヨタ自動車株式会社 | 希土類磁石の製造方法、及び希土類磁石 |
FR2964786B1 (fr) | 2010-09-09 | 2013-03-15 | Commissariat Energie Atomique | Procédé de réalisation d'éléments a puce munis de rainures d'insertion de fils |
JP6305916B2 (ja) | 2012-03-30 | 2018-04-04 | インターメタリックス株式会社 | NdFeB系焼結磁石 |
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JP2005197662A (ja) * | 2004-10-18 | 2005-07-21 | Tdk Corp | R−t−b系希土類永久磁石 |
WO2008032426A1 (en) * | 2006-09-15 | 2008-03-20 | Intermetallics Co., Ltd. | PROCESS FOR PRODUCING SINTERED NdFeB MAGNET |
JP2012060139A (ja) * | 2011-10-12 | 2012-03-22 | Inter Metallics Kk | NdFeB系焼結磁石の製造方法 |
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CN104584148A (zh) | 2015-04-29 |
JP6186363B2 (ja) | 2017-08-23 |
KR101662465B1 (ko) | 2016-10-04 |
WO2014034650A1 (ja) | 2014-03-06 |
EP2889883B1 (en) | 2017-03-08 |
CN104584148B (zh) | 2017-12-26 |
EP2889883A1 (en) | 2015-07-01 |
US10546673B2 (en) | 2020-01-28 |
EP2889883A4 (en) | 2015-10-07 |
KR20150038188A (ko) | 2015-04-08 |
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