JP2015038950A - 希土類磁石 - Google Patents
希土類磁石 Download PDFInfo
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- JP2015038950A JP2015038950A JP2013263372A JP2013263372A JP2015038950A JP 2015038950 A JP2015038950 A JP 2015038950A JP 2013263372 A JP2013263372 A JP 2013263372A JP 2013263372 A JP2013263372 A JP 2013263372A JP 2015038950 A JP2015038950 A JP 2015038950A
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- Prior art keywords
- cross
- sectional area
- rare earth
- main phase
- earth magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 86
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 68
- 239000013078 crystal Substances 0.000 claims abstract description 109
- 238000009826 distribution Methods 0.000 claims abstract description 61
- 239000002245 particle Substances 0.000 claims description 86
- 238000000034 method Methods 0.000 claims description 51
- 230000008569 process Effects 0.000 claims description 23
- 238000009499 grossing Methods 0.000 claims description 13
- 230000005347 demagnetization Effects 0.000 abstract description 25
- 229910052692 Dysprosium Inorganic materials 0.000 abstract description 7
- 229910052771 Terbium Inorganic materials 0.000 abstract description 6
- 239000012071 phase Substances 0.000 description 96
- 239000002994 raw material Substances 0.000 description 31
- 230000005291 magnetic effect Effects 0.000 description 21
- 239000000843 powder Substances 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 229910045601 alloy Inorganic materials 0.000 description 17
- 239000000956 alloy Substances 0.000 description 17
- 238000010298 pulverizing process Methods 0.000 description 17
- 229910052779 Neodymium Inorganic materials 0.000 description 10
- 239000000654 additive Substances 0.000 description 10
- 230000000996 additive effect Effects 0.000 description 10
- 230000005381 magnetic domain Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 230000004907 flux Effects 0.000 description 9
- 125000004429 atom Chemical group 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000004663 powder metallurgy Methods 0.000 description 7
- 238000005245 sintering Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052777 Praseodymium Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 4
- 238000010899 nucleation Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910052733 gallium Inorganic materials 0.000 description 3
- 229910052732 germanium Inorganic materials 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- -1 tetragonal compound Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- H01F1/0536—Alloys characterised by their composition containing rare earth metals sintered
-
- 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
Abstract
【解決手段】本発明に係る希土類磁石は、主相であるR2T14B結晶粒子と、該R2T14B結晶粒子間の粒界相とを含んだ焼結磁石であって、その任意の断面において主相結晶粒子の断面積分布をヒストグラムで評価したときに、その断面積分布が、断面積の平均値を挟んでその両側にそれぞれ少なくとも一つのピークを持つ分布となるように粒径の大きな結晶粒子と粒径の小さな結晶粒子とを制御する。
【選択図】 図1
Description
w=(平均値−最小値)/m (1)
尚、wは扱い易い桁数で丸める。区間幅の決定に断面積データの最大値ではなく平均値を用いるのは、異常粒成長等による特異なデータの影響を緩和するためである。具体例で示せば、60個の断面積データを得た場合m=8であり、断面積の平均値が13.6μm2で最小値が1.2μm2であるとすると、w=(13.6−1.2)/8=1.55となり、これを丸めてw=2と決定する。このmとwとにより、度数分布表が得られ、これをもとにヒストグラムが作成できる。
R:29.5〜33質量%
B:0.7〜0.95質量%
M:0.03〜1.5質量%
Cu:0.01〜1.5質量%、及び、
Fe:実質的に残部、及び、
残部を占める元素のうちのFe以外の元素の合計含有量:5質量%以下。
D=(B1−B0)/B0*100(%)
と、評価される。
2 粒界相
Claims (3)
- 主相であるR2T14B結晶粒子と、該R2T14B結晶粒子間の粒界相とを含んだ焼結磁石であって、その任意の断面において主相結晶粒子の断面積分布をヒストグラムで評価したときに、該断面積分布が、断面積の平均値を挟んでその両側にそれぞれ少なくとも一つのピークを持つ分布であることを特徴とする希土類磁石。
- 前記主相結晶粒子の断面積分布を表す前記ヒストグラムにおいて、断面積の平均値よりも小さい側に現れるピークのうち最も度数の高いものを第1のピークとしたときに、該第1のピークの幅がヒストグラムの区間幅を基準として計ったときに5.5区間以上となっていることを特徴とする請求項1に記載の希土類磁石。
- 前記主相結晶粒子の断面積分布を表す前記ヒストグラムを、スムージング処理により線グラフとしたときに、該線グラフは、前記第1のピークに対応する上に凸状の形状を示す部分を有し、かつ該上に凸状の形状となる部分の断面積が大きい側の肩部に隆起部を持つことを特徴とする請求項1または2に記載の希土類磁石。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013263372A JP6287167B2 (ja) | 2013-07-16 | 2013-12-20 | 希土類磁石 |
DE102014109996.6A DE102014109996A1 (de) | 2013-07-16 | 2014-07-16 | Auf seltenen Erden basierender Magnet |
CN201410338962.8A CN104299742A (zh) | 2013-07-16 | 2014-07-16 | 稀土类磁铁 |
US14/332,666 US10020099B2 (en) | 2013-07-16 | 2014-07-16 | Rare earth based magnet |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013147690 | 2013-07-16 | ||
JP2013147690 | 2013-07-16 | ||
JP2013263372A JP6287167B2 (ja) | 2013-07-16 | 2013-12-20 | 希土類磁石 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2015038950A true JP2015038950A (ja) | 2015-02-26 |
JP6287167B2 JP6287167B2 (ja) | 2018-03-07 |
Family
ID=52131526
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2013263372A Active JP6287167B2 (ja) | 2013-07-16 | 2013-12-20 | 希土類磁石 |
Country Status (4)
Country | Link |
---|---|
US (1) | US10020099B2 (ja) |
JP (1) | JP6287167B2 (ja) |
CN (1) | CN104299742A (ja) |
DE (1) | DE102014109996A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017183710A (ja) * | 2016-03-28 | 2017-10-05 | Tdk株式会社 | R−t−b系永久磁石 |
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 (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107430917B (zh) * | 2015-03-25 | 2020-08-18 | Tdk株式会社 | 稀土类磁铁 |
US10784028B2 (en) * | 2016-02-26 | 2020-09-22 | Tdk Corporation | R-T-B based permanent magnet |
DE102018107491A1 (de) * | 2017-03-31 | 2018-10-04 | Tdk Corporation | R-t-b basierter permanentmagnet |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10289813A (ja) * | 1997-04-16 | 1998-10-27 | Hitachi Metals Ltd | 希土類磁石 |
JP2000188213A (ja) * | 1998-10-14 | 2000-07-04 | Hitachi Metals Ltd | R―t―b系焼結型永久磁石 |
JP2002356717A (ja) * | 2001-05-29 | 2002-12-13 | Shin Etsu Chem Co Ltd | 希土類ボンド磁石用合金の製造方法並びに希土類ボンド磁石組成物 |
JP2007287870A (ja) * | 2006-04-14 | 2007-11-01 | Shin Etsu Chem Co Ltd | 希土類永久磁石の製造方法 |
JP2010150604A (ja) * | 2008-12-25 | 2010-07-08 | Tdk Corp | 希土類焼結磁石の製造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0778269B2 (ja) | 1983-05-31 | 1995-08-23 | 住友特殊金属株式会社 | 永久磁石用希土類・鉄・ボロン系正方晶化合物 |
JPH0684677A (ja) * | 1992-09-01 | 1994-03-25 | Honda Motor Co Ltd | 永久磁石の作製方法 |
JP3921399B2 (ja) | 2001-03-01 | 2007-05-30 | Tdk株式会社 | 焼結磁石 |
US7618497B2 (en) * | 2003-06-30 | 2009-11-17 | Tdk Corporation | R-T-B based rare earth permanent magnet and method for production thereof |
US20060165550A1 (en) * | 2005-01-25 | 2006-07-27 | Tdk Corporation | Raw material alloy for R-T-B system sintered magnet, R-T-B system sintered magnet and production method thereof |
CN101542644A (zh) * | 2007-06-29 | 2009-09-23 | Tdk株式会社 | 稀土磁铁 |
JP6303480B2 (ja) * | 2013-03-28 | 2018-04-04 | Tdk株式会社 | 希土類磁石 |
US20160042847A1 (en) * | 2013-03-29 | 2016-02-11 | Hitachi Metals, Ltd. | R-t-b based sintered magnet |
-
2013
- 2013-12-20 JP JP2013263372A patent/JP6287167B2/ja active Active
-
2014
- 2014-07-16 US US14/332,666 patent/US10020099B2/en active Active
- 2014-07-16 CN CN201410338962.8A patent/CN104299742A/zh active Pending
- 2014-07-16 DE DE102014109996.6A patent/DE102014109996A1/de not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10289813A (ja) * | 1997-04-16 | 1998-10-27 | Hitachi Metals Ltd | 希土類磁石 |
JP2000188213A (ja) * | 1998-10-14 | 2000-07-04 | Hitachi Metals Ltd | R―t―b系焼結型永久磁石 |
JP2002356717A (ja) * | 2001-05-29 | 2002-12-13 | Shin Etsu Chem Co Ltd | 希土類ボンド磁石用合金の製造方法並びに希土類ボンド磁石組成物 |
JP2007287870A (ja) * | 2006-04-14 | 2007-11-01 | Shin Etsu Chem Co Ltd | 希土類永久磁石の製造方法 |
JP2010150604A (ja) * | 2008-12-25 | 2010-07-08 | Tdk Corp | 希土類焼結磁石の製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017183710A (ja) * | 2016-03-28 | 2017-10-05 | Tdk株式会社 | R−t−b系永久磁石 |
JP2021158205A (ja) * | 2020-03-26 | 2021-10-07 | Tdk株式会社 | R‐t‐b系永久磁石 |
JP7409193B2 (ja) | 2020-03-26 | 2024-01-09 | Tdk株式会社 | R‐t‐b系永久磁石 |
Also Published As
Publication number | Publication date |
---|---|
US20150310972A1 (en) | 2015-10-29 |
US10020099B2 (en) | 2018-07-10 |
JP6287167B2 (ja) | 2018-03-07 |
DE102014109996A1 (de) | 2015-01-22 |
CN104299742A (zh) | 2015-01-21 |
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