JP5426029B2 - 希土類永久磁性材料およびその調製方法 - Google Patents
希土類永久磁性材料およびその調製方法 Download PDFInfo
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 70
- 239000000696 magnetic material Substances 0.000 title claims description 67
- 150000002910 rare earth metals Chemical class 0.000 title claims description 66
- 238000002360 preparation method Methods 0.000 title 1
- 239000000843 powder Substances 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 42
- 239000011812 mixed powder Substances 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 26
- 238000003825 pressing Methods 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 20
- 229910052779 Neodymium Inorganic materials 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 18
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 229910052771 Terbium Inorganic materials 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052726 zirconium Inorganic materials 0.000 claims description 11
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 10
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 9
- -1 alkenyl ether Chemical compound 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 238000010902 jet-milling Methods 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- 150000005215 alkyl ethers Chemical class 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052735 hafnium Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 239000010949 copper Substances 0.000 description 33
- 229910052739 hydrogen Inorganic materials 0.000 description 26
- 239000001257 hydrogen Substances 0.000 description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 24
- 229910052692 Dysprosium Inorganic materials 0.000 description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 12
- 229910052689 Holmium Inorganic materials 0.000 description 11
- 230000004907 flux Effects 0.000 description 9
- 230000002427 irreversible effect Effects 0.000 description 9
- 229910052796 boron Inorganic materials 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052777 Praseodymium Inorganic materials 0.000 description 6
- 229910052733 gallium Inorganic materials 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 150000004678 hydrides Chemical class 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003440 dysprosium oxide Inorganic materials 0.000 description 1
- NLQFUUYNQFMIJW-UHFFFAOYSA-N dysprosium(iii) oxide Chemical compound O=[Dy]O[Dy]=O NLQFUUYNQFMIJW-UHFFFAOYSA-N 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- H01F41/0273—Imparting anisotropy
-
- 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
-
- 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- H01F1/047—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
- Continuous Casting (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
Ra−x−yHoxDyyFe1−a−b−c−dCodMcBb
x、y、a、b、c、およびdは、対応する元素の重量割合であり、28%≦a≦34%、0.95%≦b≦1.3%、0≦c≦1.5%、1%≦d≦10%、15%≦x≦20%、および3%≦y≦8%であり;
Rは、希土類元素であり、Nd、Pr、La、Ce、Gd、Tb、およびそれらの組み合わせからなる群から選択され;
Mは、Al、Cu、Ti、V、Cr、Zr、Hf、Mn、Nb、Sn、Mo、Ga、Si、およびそれらの組み合わせからなる群から選択される。
前記希土類永久磁性材料の単一金属を計量、溶解して、インゴットを形成するために鋳造され、または薄片を形成するためにストリップキャストされる、溶融合金を形成するステップと、
前記インゴットまたは前記薄片を粉砕およびジェットミルにかけて粉末を形成し、次いでそれらを酸化防止剤と混合して混合粉末を形成するステップと、
磁界中で前記混合粉末をプレスして、前記希土類永久磁性材料のパリソン(parison)を形成するステップと、
真空条件下で前記パリソンを焼結して、前記希土類永久磁性材料を得るステップと、
を含む。
Ra−x−yHoxDyyFe1−a−b−c−dCodMcBb
ここで、x、y、a、b、c、およびdは、対応する元素の重量割合であり、28%≦a≦34%、0.95%≦b≦1.3%、0≦c≦1.5%、1%≦d≦10%、15%≦x≦20%、および3%≦y≦8%であり;
Rは、希土類元素であり、Nd、Pr、La、Ce、Gd、Tb、およびそれらの組み合わせからなる群から選択され;
Mは、Al、Cu、Ti、V、Cr、Zr、Hf、Mn、Nb、Sn、Mo、Ga、Si、およびそれらの組み合わせからなる群から選択される。
30%≦a≦33%、0.97%≦b≦1.2%、0.1%≦c≦1.3%、1.5%≦d≦9%、17%≦x≦19%、4.1%≦y≦7.7%。
Rは、Nd、Tb、またはそれらの組み合わせから選択される。さらに他の実施形態において、Rは、NdおよびTbを(5.6:1)〜(10.1:1)の重量比で含む。
Ra−x−yHoxDyyFe1−a−b−c−dCodMcBb
ここで、x、y、a、b、c、およびdは、対応する元素の重量割合であり、28%≦a≦34%、0.95%≦b≦1.3%、0≦c≦1.5%、1%≦d≦10%、15%≦x≦20%、および3%≦y≦8%であり;
Rは、希土類元素であり、Nd、Pr、La、Ce、Gd、Tb、およびそれらの組み合わせからなる群から選択され;
Mは、Al、Cu、Ti、V、Cr、Zr、Hf、Mn、Nb、Sn、Mo、Ga、Si、およびそれらの組み合わせからなる群から選択される。
1つの実施形態では、酸化防止剤は、Shenzhen Deepocean Chemical Industry Co.,Ltd.(中国)から市販のポリエチレンオキシドモノ脂肪酸エステルであってもよい。
特許文献1(中国特許第CN101409121号)の実施例6に開示された単一金属によって希土類永久磁性材料を調製する方法は、本開示による実施例1の方法に大体似ており、次のステップを含む。
希土類永久磁性材料を調製する方法は、特許文献1(中国特許第CN101409121号)の実施例1に開示された方法に大体似ており、次のステップを含む。
異なる最高実用温度での保磁力および不可逆磁束損失を、曲線測定システムNIM200C(国立計測研究所(中国))を使用して希土類永久磁性材料T1〜T8、CT1およびCT2に関してテストした。
Claims (10)
- 下記一般式によって表された希土類永久磁性材料。
Ra−x−yHoxDyyFe1−a−b−c−dCodMcBb
式中、x、y、a、b、c、およびdは、対応する元素の重量割合であり、30%≦a≦33%、0.97%≦b≦1.2%、0.1%≦c≦1.3%、1.5%≦d≦9%、17%≦x≦19%、4.1%≦y≦7.7%であり;
Rは、希土類元素であり、Nd、Pr、La、Ce、Gd、Tb、およびそれらの組み合わせからなる群から選択され;
Mは、Al、Cu、Ti、V、Cr、Zr、Hf、Mn、Nb、Sn、Mo、Ga、Si、およびそれらの組み合わせからなる群から選択される。 - Rが、Nd、Tb、またはそれらの組み合わせから選択され、あるいは、NdおよびTbを(5.6:1)〜(10.1:1)の重量比で含む、請求項1に記載の希土類永久磁性材料。
- 前記希土類永久磁性材料は、下記式によって表される、請求項1または2に記載の希土類永久磁性材料。
Pr0.46Nd2.02Dy2.80Tb0.20Ho17.91B1Fe73.11Co1.65Al0.2Cu0.15Zr0.15Ga0.1 - 請求項1に記載の希土類永久磁性材料を調製する方法であって、
前記希土類永久磁性材料の単一金属を計量、溶解して、インゴットを形成するために鋳造され、または薄片を形成するためにストリップキャストされる、溶融合金を形成するステップと、
前記インゴットまたは前記薄片を粉砕およびジェットミルにかけて粉末を形成し、次いでそれらを酸化防止剤と混合して混合粉末を形成するステップと、
磁界中で前記混合粉末をプレスして、前記希土類永久磁性材料のパリソンを形成するステップと、
真空条件下で前記パリソンを焼結して、前記希土類永久磁性材料を得るステップと、
を含む、方法。 - 真空条件下で焼結された前記パリソンを焼き戻すステップをさらに含み、該焼き戻しステップが、500℃〜920℃の温度下で行われる、請求項4に記載の方法。
- 前記インゴットまたは前記薄片の粉末が、2ミクロン〜10ミクロンの平均粒径を有する、請求項4または5に記載の方法。
- 前記酸化防止剤が、ポリエチレンオキシドアルキルエーテル、ポリエチレンオキシドモノ脂肪酸エステル、ポリエチレンオキシドアルケニルエーテル、またはそれらの組み合わせからなる群から選択され、前記粉末の0.1重量%〜5重量%の量で使用される、請求項4〜6のいずれかに記載の方法。
- 前記プレスステップが、10秒〜60秒間、1.2T〜2.0Tに及ぶ磁界強度および10MPa〜200MPaの圧力で行われる、請求項4〜7のいずれかに記載の方法。
- 前記焼結ステップが、2時間〜4時間、2×10 −2 〜5×10 −2 Paの真空度で1030℃〜1120℃の温度で行われる、請求項4〜8のいずれかに記載の方法。
- 前記焼き戻しステップが、2時間〜8時間行われ、2×10 −2 Pa〜5×10 −2 Paの真空度で行われる、請求項4〜9のいずれかに記載の方法。
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CN200910190316.0 | 2009-09-15 | ||
CN200910190316A CN102024544B (zh) | 2009-09-15 | 2009-09-15 | 一种稀土永磁材料及其制备方法 |
PCT/CN2010/075594 WO2011032432A1 (en) | 2009-09-15 | 2010-07-30 | Rare earth permanent magnetic material and preparation method thereof |
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CN101853723B (zh) | 2009-03-31 | 2012-11-21 | 比亚迪股份有限公司 | 一种复合磁性材料及其制备方法 |
WO2011039804A1 (ja) * | 2009-09-30 | 2011-04-07 | 株式会社 東芝 | 磁気冷凍用磁性材料、磁気冷凍デバイスおよび磁気冷凍システム |
BR112014000922A2 (pt) * | 2011-07-19 | 2017-02-14 | Astronautics Corp | sistema e método para degradação reversa de um material magnetocalórico |
CN102956336B (zh) * | 2011-08-17 | 2016-02-03 | 赣州嘉通新材料有限公司 | 一种制备复合添加钆、钬和钇的烧结钕铁硼永磁材料的方法 |
CN103123843B (zh) * | 2011-11-21 | 2015-10-07 | 中国科学院宁波材料技术与工程研究所 | 一种细晶粒各向异性致密化钕铁硼永磁体的制备方法 |
CN102509602B (zh) * | 2011-11-21 | 2015-06-24 | 宁波市展发磁业科技有限公司 | 一种高性能磁性材料 |
CN102592777B (zh) * | 2012-03-15 | 2013-09-18 | 宁德市星宇科技有限公司 | 一种低成本烧结钕铁硼磁体及其制备方法 |
CN102881395B (zh) * | 2012-10-15 | 2015-10-21 | 南京信息工程大学 | 一种合金磁性材料及其制备方法 |
KR101733905B1 (ko) * | 2013-03-18 | 2017-05-08 | 인터메탈릭스 가부시키가이샤 | RFeB계 자석 제조 방법, RFeB계 자석 및 입계 확산 처리용 도포물 |
CN106100255A (zh) * | 2016-06-27 | 2016-11-09 | 无锡新大力电机有限公司 | 一种电机用稀土永磁体的制备方法 |
CN106373688B (zh) * | 2016-08-31 | 2019-03-29 | 浙江东阳东磁稀土有限公司 | 一种制备稀土永磁材料的方法 |
CN107068380B (zh) * | 2017-01-23 | 2020-02-18 | 包头天和磁材科技股份有限公司 | 永磁材料的生产方法 |
CN107919199A (zh) * | 2017-10-17 | 2018-04-17 | 浙江东阳东磁稀土有限公司 | 一种超低剩磁温度系数稀土永磁材料及其制备方法 |
CN109712770B (zh) * | 2019-01-28 | 2020-07-07 | 包头天和磁材科技股份有限公司 | 钐钴磁体及其制造方法 |
CN115558501A (zh) * | 2022-10-13 | 2023-01-03 | 包头金山磁材有限公司 | 一种抗氧化剂及其应用、稀土永磁体及其制备方法 |
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US5466308A (en) * | 1982-08-21 | 1995-11-14 | Sumitomo Special Metals Co. Ltd. | Magnetic precursor materials for making permanent magnets |
JPS6227548A (ja) * | 1985-07-27 | 1987-02-05 | Sumitomo Special Metals Co Ltd | 永久磁石合金 |
US5223047A (en) * | 1986-07-23 | 1993-06-29 | Hitachi Metals, Ltd. | Permanent magnet with good thermal stability |
US6319336B1 (en) * | 1998-07-29 | 2001-11-20 | Dowa Mining Co., Ltd. | Permanent magnet alloy having improved heat resistance and process for production thereof |
US6302972B1 (en) * | 1998-12-07 | 2001-10-16 | Sumitomo Special Metals Co., Ltd | Nanocomposite magnet material and method for producing nanocomposite magnet |
EP1014392B9 (en) * | 1998-12-15 | 2004-11-24 | Shin-Etsu Chemical Co., Ltd. | Rare earth/iron/boron-based permanent magnet alloy composition |
JP3275882B2 (ja) * | 1999-07-22 | 2002-04-22 | セイコーエプソン株式会社 | 磁石粉末および等方性ボンド磁石 |
DE19945942C2 (de) * | 1999-09-24 | 2003-07-17 | Vacuumschmelze Gmbh | Verfahren zur Herstellung von Dauermagneten aus einer borarmen Nd-Fe-B-Legierung |
EP1760734A1 (en) * | 2004-06-25 | 2007-03-07 | TDK Corporation | Rare earth sintered magnet, raw material alloy powder for rare earth sintered magnet, and process for producing rare earth sintered magnet |
CN101071667B (zh) * | 2007-04-12 | 2010-11-24 | 北京中科三环高技术股份有限公司 | 含钆的钕铁硼稀土永磁材料及其制造方法 |
CN101447268B (zh) * | 2007-11-26 | 2012-08-22 | 比亚迪股份有限公司 | 一种钕铁硼永磁材料及其制备方法 |
CN100559519C (zh) * | 2007-12-08 | 2009-11-11 | 宁波科田磁业有限公司 | 用钬代替镝的烧结钕铁硼永磁材料 |
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CN101404196A (zh) | 2008-07-14 | 2009-04-08 | 浙江升华强磁材料有限公司 | 含钬的钕铁硼稀土永磁材料及其制造方法 |
CN101409121B (zh) * | 2008-08-05 | 2011-01-05 | 中钢集团安徽天源科技股份有限公司 | 电机用钕铁硼永磁体及其制造方法 |
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CN102024544B (zh) | 2012-09-05 |
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JP2013504881A (ja) | 2013-02-07 |
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EP2478528A1 (en) | 2012-07-25 |
WO2011032432A1 (en) | 2011-03-24 |
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