JPWO2013186864A1 - 焼結磁石及びその製造方法 - Google Patents
焼結磁石及びその製造方法 Download PDFInfo
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- JPWO2013186864A1 JPWO2013186864A1 JP2014521031A JP2014521031A JPWO2013186864A1 JP WO2013186864 A1 JPWO2013186864 A1 JP WO2013186864A1 JP 2014521031 A JP2014521031 A JP 2014521031A JP 2014521031 A JP2014521031 A JP 2014521031A JP WO2013186864 A1 JPWO2013186864 A1 JP WO2013186864A1
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- sintered magnet
- fluorine
- concentration
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- oxyfluoride
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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
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—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
- H01F41/02—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
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—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
- H01F41/02—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
- 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
- H01F41/0266—Moulding; Pressing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—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
- H01F41/02—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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
フッ素の量が0.001〜10原子%の範囲を超えるとNd2Fe14B焼結磁石の主相に侵入したフッ素により主相の結晶が分解し保磁力の小さな強磁性相が形成され、残留磁束密度は増加するが保磁力の温度依存性の低下や減磁曲線の角型性低下につながる。したがってフッ素導入量は10原子%以下が望ましく、表面から100μm深さまでの部分で20原子%以下が望ましい。粒界相や粒界三重点のフッ素濃度は前記10%以上であっても問題なく、NdOF系酸フッ化物が形成された場合、フッ素濃度は酸素濃度よりも高い方がNd2Fe14B焼結磁石の保磁力増大が顕著になる。
フッ素の量が表面近傍で15原子%を超えるとDy粒界拡散Nd2Fe14B焼結磁石の主相に侵入したフッ素により主相の結晶が分解し保磁力の小さな強磁性相や非磁性相が形成され、残留磁束密度は増加するが保磁力の温度依存性の低下や減磁曲線の角型性低下につながる。したがってフッ素導入量は磁石全体に対して10原子%以下が望ましく、表面から100μm深さまでの部分で15原子%以下が望ましい。粒界相や粒界三重点のフッ素濃度は前記5%以上であっても問題なく、NdOF系酸フッ化物が形成された場合、フッ素濃度は酸素濃度よりも高い方がDy粒界拡散Nd2Fe14B焼結磁石の保磁力増大が顕著になる。
3 粒界相
4 粒界三重点
5 外周部
Claims (9)
- NdFeBの主相と、粒界相とで構成する焼結磁石において、
前記粒界相に酸フッ化物を有し、
前記酸フッ化物に含まれるフッ素濃度が焼結磁石表面から焼結磁石中心にかけて深さ方向に減少し、
前記酸フッ化物に含まれる重希土類元素の濃度が前記焼結磁石表面と前記焼結磁石中心とではほぼ一定であることを特徴とする焼結磁石。 - 請求項1に記載の焼結磁石において、
100×100μm2の面積で検出される添加元素の濃度は前記焼結磁石表面と前記焼結磁石中心とでほぼ一定であり、
10×10nm2の面積で検出される添加元素の濃度は前記焼結磁石表面の方が前記焼結磁石中心よりも高いことを特徴とする焼結磁石。 - 請求項1または2に記載の焼結磁石において、
前記添加元素はAl,Cu,Ti,Zr,Mn,Co,Sn,Si,Cr,V,Ga,Geのうちの少なくとも一つの元素であり、前記粒界相に前記添加元素が偏在している焼結磁石。 - 請求項1乃至3のいずれかに記載の焼結磁石において、
前記酸フッ化物に含まれるフッ素の濃度は、前記焼結磁石の表面から深さ方向に100μmの範囲の領域における平均値で33原子%を超えていることを特徴とする焼結磁石。 - 請求項1乃至4のいずれかに記載の焼結磁石において、
前記酸フッ化物は、立方晶または正方晶の結晶構造を含むことを特徴とする焼結磁石。 - 請求項1乃至5のいずれかに記載の焼結磁石において、
Cuよりもフッ化物の形成エネルギーを小とする金属元素を0.1〜5wt%の濃度範囲で含有することを特徴とする焼結磁石。 - 請求項1乃至6のいずれかに記載の焼結磁石において、
前記焼結磁石全体のフッ素含有量は5原子%以下であることを特徴とする焼結磁石。 - 請求項1乃至7のいずれかに記載の焼結磁石において、
前記焼結磁石全体の酸素濃度は3000ppm以下であることを特徴とする焼結磁石。 - 請求項1乃至8のいずれかに記載の焼結磁石の製造方法において、
解離性フッ化剤を使用してフッ素を前記焼結磁石の粒界相に選択的に導入することを特徴とする焼結磁石の製造方法。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/065070 WO2013186864A1 (ja) | 2012-06-13 | 2012-06-13 | 焼結磁石及びその製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPWO2013186864A1 true JPWO2013186864A1 (ja) | 2016-02-01 |
JP5970548B2 JP5970548B2 (ja) | 2016-08-17 |
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Family Applications (1)
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JP2014521031A Expired - Fee Related JP5970548B2 (ja) | 2012-06-13 | 2012-06-13 | 焼結磁石及びその製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150162117A1 (ja) |
EP (1) | EP2863399A4 (ja) |
JP (1) | JP5970548B2 (ja) |
CN (1) | CN104380397A (ja) |
WO (1) | WO2013186864A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020161789A (ja) * | 2019-03-25 | 2020-10-01 | 日立金属株式会社 | R−t−b系焼結磁石 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5868500B2 (ja) * | 2012-05-30 | 2016-02-24 | 株式会社日立製作所 | 焼結磁石及びその製造方法 |
JP6102901B2 (ja) * | 2014-12-19 | 2017-03-29 | トヨタ自動車株式会社 | 車両用シート |
JP7314513B2 (ja) * | 2018-07-09 | 2023-07-26 | 大同特殊鋼株式会社 | RFeB系焼結磁石 |
KR102411584B1 (ko) | 2018-10-22 | 2022-06-20 | 주식회사 엘지화학 | 소결 자석의 제조 방법 및 소결 자석 |
US11239011B2 (en) * | 2019-03-25 | 2022-02-01 | Hitachi Metals, Ltd. | Sintered R-T-B based magnet |
CN117012486A (zh) * | 2022-04-29 | 2023-11-07 | 福建省长汀金龙稀土有限公司 | 一种钕铁硼磁体材料及其制备方法、应用 |
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2012
- 2012-06-13 US US14/407,108 patent/US20150162117A1/en not_active Abandoned
- 2012-06-13 WO PCT/JP2012/065070 patent/WO2013186864A1/ja active Application Filing
- 2012-06-13 CN CN201280073914.XA patent/CN104380397A/zh active Pending
- 2012-06-13 EP EP12878748.8A patent/EP2863399A4/en not_active Withdrawn
- 2012-06-13 JP JP2014521031A patent/JP5970548B2/ja not_active Expired - Fee Related
Patent Citations (7)
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JP2006303197A (ja) * | 2005-04-20 | 2006-11-02 | Neomax Co Ltd | R−t−b系焼結磁石の製造方法 |
JP2007116142A (ja) * | 2005-09-26 | 2007-05-10 | Hitachi Ltd | 磁性材料,磁石及び回転機 |
JP2008270699A (ja) * | 2007-03-29 | 2008-11-06 | Hitachi Ltd | 希土類磁石及びその製造方法 |
JP2011114247A (ja) * | 2009-11-30 | 2011-06-09 | Hitachi Ltd | 強磁性化合物磁石 |
WO2011081170A1 (ja) * | 2009-12-28 | 2011-07-07 | 日立金属株式会社 | 耐食性磁石およびその製造方法 |
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JP2020161789A (ja) * | 2019-03-25 | 2020-10-01 | 日立金属株式会社 | R−t−b系焼結磁石 |
Also Published As
Publication number | Publication date |
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WO2013186864A1 (ja) | 2013-12-19 |
US20150162117A1 (en) | 2015-06-11 |
EP2863399A1 (en) | 2015-04-22 |
EP2863399A4 (en) | 2016-02-17 |
JP5970548B2 (ja) | 2016-08-17 |
CN104380397A (zh) | 2015-02-25 |
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