JP6288076B2 - R−t−b系焼結磁石 - Google Patents
R−t−b系焼結磁石 Download PDFInfo
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- 150000001875 compounds Chemical class 0.000 claims description 21
- 229910052733 gallium Inorganic materials 0.000 claims description 8
- 229910052723 transition metal Inorganic materials 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 25
- 239000000843 powder Substances 0.000 description 19
- 239000000956 alloy Substances 0.000 description 18
- 229910045601 alloy Inorganic materials 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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- 238000010298 pulverizing process Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002612 dispersion medium Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000007561 laser diffraction method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- JGHZJRVDZXSNKQ-UHFFFAOYSA-N methyl octanoate Chemical compound CCCCCCCC(=O)OC JGHZJRVDZXSNKQ-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- H01F1/06—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
- H01F1/086—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 sintered
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
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Description
R:29.0質量%以上31.5質量%以下(RはNdおよび/またはPr)、
B:0.86質量%以上0.90質量%以下、
Ga:0.4質量%以上0.6質量%以下、
Al:0.5質量%以下(0質量%を含む)、
残部がT(Tは遷移金属元素でありFeを必ず含む)および不可避的不純物からなることを特徴とするR−T−B系焼結磁石である。
Cu:0.05質量%以上0.20質量%以下、
をさらに含むことを特徴とするR−T−B系焼結磁石である。
B:0.87質量%以上0.89質量%以下、
であることを特徴とするR−T−B系焼結磁石である。
本発明の1つの実施形態に係るR−T−B系焼結磁石は、
R:29.0質量%以上31.5質量%以下(RはNdおよび/またはPr)、
B:0.86質量%以上0.90質量%以下、
Ga:0.4質量%以上0.6質量%以下、
Al:0.5質量%以下(0質量%を含む)、
残部T(Tは遷移金属元素でありFeを必ず含む)および不可避的不純物からなる。
あるいは、
R:29.0質量%以上31.5質量%以下(RはNdおよび/またはPr)、
B:0.86質量%以上0.90質量%以下、
Ga:0.4質量%以上0.6質量%以下、
Cu:0.05質量%以上0.20質量%以下、
Al:0.5質量%以下(0質量%を含む)、
残部T(Tは遷移金属元素でありFeを必ず含む)および不可避的不純物からなる。
R−T−B系焼結磁石の製造方法の一例を説明する。R−T−B系焼結磁石の製造方法は、合金粉末を得る工程、成形工程、焼結工程、熱処理工程を有する。以下、各工程について説明する。
前記組成となるようにそれぞれの元素の金属または合金を準備し、これらをストリップキャスティング法等を用いてフレーク状の合金を製造する。得られたフレーク状の合金を水素粉砕し、粗粉砕粉のサイズを例えば1.0mm以下とする。次に、粗粉砕粉をジェットミル等により微粉砕することで、例えば粒径D50(気流分散法によるレーザー回折法で得られた値(メジアン径))が3〜7μmの微粉砕粉(合金粉末)を得る。なお、ジェットミル粉砕前の粗粉砕粉、ジェットミル粉砕中およびジェットミル粉砕後の合金粉末に助剤として公知の潤滑剤を使用してもよい。
得られた合金粉末を用いて磁界中成形を行い、成形体を得る。磁界中成形は、金型のキャビティー内に乾燥した合金粉末を挿入し、磁界を印加しながら成形する乾式成形法、金型のキャビティー内に該合金粉末を分散させたスラリーを注入し、スラリーの分散媒を排出しながら成形する湿式成形法を含む既知の任意の磁界中成形方法を用いてよい。
成形体を焼結することにより焼結磁石を得る。成形体の焼結は既知の方法を用いることができる。なお、焼結時の雰囲気による酸化を防止するために、焼結は真空雰囲気中または雰囲気ガス中で行うことが好ましい。雰囲気ガスは、ヘリウム、アルゴンなどの不活性ガスを用いることが好ましい。
得られた焼結磁石に対し、磁気特性を向上させることを目的とした熱処理を行うことが好ましい。熱処理温度、熱処理時間などは公知の条件を採用することができる。得られた焼結磁石に磁石寸法の調整のため、研削などの機械加工を施してもよい。その場合、熱処理は機械加工前でも機械加工後でもよい。さらに、得られた焼結磁石に、表面処理を施してもよい。表面処理は、公知の表面処理で良く、例えばAl蒸着や電気Niめっきや樹脂塗装などの表面処理を行うことができる。
Claims (8)
- Nd2Fe14B型化合物を主相とし、前記主相と、二つの主相間に存在する第一の粒界と、三つ以上の主相間に存在する第二の粒界とを有するR−T−B系焼結磁石であって、
R:29.0質量%以上31.5質量%以下(RはNdおよび/またはPr)、
B:0.86質量%以上0.90質量%以下、
Ga:0.4質量%以上0.6質量%以下、
Al:0.5質量%以下(0質量%を含む)、
残部がT(Tは遷移金属元素でありFeを必ず含む)および不可避的不純物からなることを特徴とするR−T−B系焼結磁石。 - Cu:0.05質量%以上0.20質量%以下、
をさらに含むことを特徴とする請求項1に記載のR−T−B系焼結磁石。 - Cu:0.08質量%以上0.15質量%以下、
であることを特徴とする請求項1または2に記載のR−T−B系焼結磁石。 - B:0.87質量%以上0.89質量%以下
であることを特徴とする請求項1〜3のいずれか1項に記載のR−T−B系焼結磁石。 - Al:0.3質量%以下(0質量%を含む)
であることを特徴とする請求項1〜4のいずれか1項に記載のR−T−B系焼結磁石。 - 前記第一の粒界に、R:70質量%以上95質量%以下、Ga:5質量%以上30質量%以下、Fe:20質量%以下(0を含む)を含むR−Ga相が存在することを特徴とする請求項1〜5のいずれか1項に記載のR−T−B系焼結磁石。
- 前記第一の粒界に、R:70質量%以上95質量%以下、Ga:5質量%以上30質量%以下、Fe:20質量%以下(0を含む)を含むR−Ga相および前記R−Ga相のGaの一部がCuで置換されたR−Ga−Cu相が存在することを特徴とする請求項2または請求項2を引用する請求項3〜5のいずれか1項に記載のR−T−B系焼結磁石。
- R6Fe13Ga1からなるR−T−Ga相が存在しない第一の粒界を含むことを特徴とする請求項1〜7のいずれか1項に記載のR−T−B系焼結磁石。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013071834 | 2013-03-29 | ||
| JP2013071834 | 2013-03-29 | ||
| PCT/JP2014/058741 WO2014157451A1 (ja) | 2013-03-29 | 2014-03-27 | R-t-b系焼結磁石 |
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| Publication Number | Publication Date |
|---|---|
| JPWO2014157451A1 JPWO2014157451A1 (ja) | 2017-02-16 |
| JP6288076B2 true JP6288076B2 (ja) | 2018-03-07 |
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| Country | Link |
|---|---|
| US (1) | US20160042848A1 (ja) |
| EP (1) | EP2985768B8 (ja) |
| JP (1) | JP6288076B2 (ja) |
| CN (1) | CN105074837B (ja) |
| ES (1) | ES2749754T3 (ja) |
| WO (1) | WO2014157451A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2980808B1 (en) * | 2013-03-29 | 2018-06-13 | Hitachi Metals, Ltd. | R-t-b-based sintered magnet |
| US10410777B2 (en) * | 2013-08-09 | 2019-09-10 | Tdk Corporation | R-T-B based sintered magnet and motor |
| US10256015B2 (en) * | 2013-08-09 | 2019-04-09 | Tdk Corporation | R-t-b based sintered magnet and rotating machine |
| US10109403B2 (en) * | 2013-08-09 | 2018-10-23 | Tdk Corporation | R-T-B based sintered magnet and motor |
| WO2015020182A1 (ja) * | 2013-08-09 | 2015-02-12 | Tdk株式会社 | R-t-b系焼結磁石、および、モータ |
| US10388442B2 (en) | 2013-08-12 | 2019-08-20 | Hitachi Metals, Ltd. | R-T-B based sintered magnet and method for producing R-T-B based sintered magnet |
| CN105453194B (zh) * | 2013-08-12 | 2018-10-16 | 日立金属株式会社 | R-t-b系烧结磁体 |
| CN105474337B (zh) * | 2013-09-02 | 2017-12-08 | 日立金属株式会社 | R‑t‑b系烧结磁体的制造方法 |
| JP6572550B2 (ja) * | 2015-02-04 | 2019-09-11 | Tdk株式会社 | R−t−b系焼結磁石 |
| US20180025818A1 (en) * | 2015-03-27 | 2018-01-25 | Hitachi Metals, Ltd. | Sintered r-tm-b magnet |
| RU2704989C2 (ru) | 2015-03-31 | 2019-11-01 | Син-Эцу Кемикал Ко., Лтд. | Спеченный магнит r-fe-b и способ его изготовления |
| TWI673729B (zh) | 2015-03-31 | 2019-10-01 | 日商信越化學工業股份有限公司 | R-Fe-B系燒結磁石及其製造方法 |
| RU2697265C2 (ru) | 2015-03-31 | 2019-08-13 | Син-Эцу Кемикал Ко., Лтд. | Спеченный магнит R-Fe-B и способ его изготовления |
| EP3179487B1 (en) | 2015-11-18 | 2021-04-28 | Shin-Etsu Chemical Co., Ltd. | R-(fe,co)-b sintered magnet and making method |
| WO2017159576A1 (ja) * | 2016-03-17 | 2017-09-21 | 日立金属株式会社 | R-t-b系焼結磁石の製造方法 |
| JP6724865B2 (ja) | 2016-06-20 | 2020-07-15 | 信越化学工業株式会社 | R−Fe−B系焼結磁石及びその製造方法 |
| 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 |
| JP6614084B2 (ja) | 2016-09-26 | 2019-12-04 | 信越化学工業株式会社 | R−Fe−B系焼結磁石の製造方法 |
| JP2018059197A (ja) * | 2016-09-30 | 2018-04-12 | 日立金属株式会社 | R−tm−b系焼結磁石 |
| WO2018101239A1 (ja) | 2016-12-02 | 2018-06-07 | 信越化学工業株式会社 | R-Fe-B系焼結磁石及びその製造方法 |
| JP7052201B2 (ja) * | 2017-03-15 | 2022-04-12 | 大同特殊鋼株式会社 | RFeB系焼結磁石の製造方法 |
| US20220148772A1 (en) * | 2019-03-13 | 2022-05-12 | Tdk Corporation | R-t-b based permanent magnet and method for manufacturing same |
| WO2022124063A1 (ja) * | 2020-12-07 | 2022-06-16 | 株式会社村田製作所 | インダクタ装置 |
| CN113593802B (zh) | 2021-07-08 | 2024-08-06 | 烟台正海磁性材料股份有限公司 | 一种耐腐蚀、高性能钕铁硼烧结磁体及其制备方法和用途 |
| CN114284018B (zh) * | 2021-12-27 | 2025-01-28 | 烟台正海磁性材料股份有限公司 | 钕铁硼磁体及其制备方法和应用 |
| JP7831045B2 (ja) * | 2022-03-22 | 2026-03-17 | 株式会社プロテリアル | R-t-b系焼結磁石 |
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|---|---|---|---|---|
| JPS6318603A (ja) * | 1986-07-11 | 1988-01-26 | Toshiba Corp | 永久磁石 |
| US5472525A (en) * | 1993-01-29 | 1995-12-05 | Hitachi Metals, Ltd. | Nd-Fe-B system permanent magnet |
| EP1073069A1 (en) * | 1993-11-02 | 2001-01-31 | TDK Corporation | Preparation of permanent magnet |
| JP2009231391A (ja) * | 2008-03-19 | 2009-10-08 | Hitachi Metals Ltd | R−t−b系焼結磁石 |
| JP5163630B2 (ja) * | 2009-12-18 | 2013-03-13 | トヨタ自動車株式会社 | 希土類磁石およびその製造方法 |
| JP5767788B2 (ja) * | 2010-06-29 | 2015-08-19 | 昭和電工株式会社 | R−t−b系希土類永久磁石、モーター、自動車、発電機、風力発電装置 |
| JP5572673B2 (ja) | 2011-07-08 | 2014-08-13 | 昭和電工株式会社 | R−t−b系希土類焼結磁石用合金、r−t−b系希土類焼結磁石用合金の製造方法、r−t−b系希土類焼結磁石用合金材料、r−t−b系希土類焼結磁石、r−t−b系希土類焼結磁石の製造方法およびモーター |
| CN103875045B (zh) * | 2011-10-13 | 2016-08-31 | Tdk株式会社 | R-t-b 系合金薄片、r-t-b 系烧结磁体及其制造方法 |
| DE112013003109T5 (de) * | 2012-06-22 | 2015-02-26 | Tdk Corp. | Gesinterter Magnet |
| JP6303480B2 (ja) * | 2013-03-28 | 2018-04-04 | Tdk株式会社 | 希土類磁石 |
| EP2980808B1 (en) * | 2013-03-29 | 2018-06-13 | Hitachi Metals, Ltd. | R-t-b-based sintered magnet |
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