JP2018174314A5 - - Google Patents
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- JP2018174314A5 JP2018174314A5 JP2018055202A JP2018055202A JP2018174314A5 JP 2018174314 A5 JP2018174314 A5 JP 2018174314A5 JP 2018055202 A JP2018055202 A JP 2018055202A JP 2018055202 A JP2018055202 A JP 2018055202A JP 2018174314 A5 JP2018174314 A5 JP 2018174314A5
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- main phase
- based sintered
- core
- rtb
- Prior art date
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- 239000002245 particle Substances 0.000 claims 5
- 239000002344 surface layer Substances 0.000 claims 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims 3
- 229910052796 boron Inorganic materials 0.000 claims 2
- 239000011258 core-shell material Substances 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 2
- 239000010410 layer Substances 0.000 claims 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- 229910052803 cobalt Inorganic materials 0.000 claims 1
- 229910052723 transition metal Inorganic materials 0.000 claims 1
Claims (4)
Ｒは１種以上の希土類元素、ＴはＦｅまたはＦｅおよびＣｏを必須とする１種以上の遷移金属元素、Ｂはホウ素であり、
前記Ｒ−Ｔ−Ｂ系焼結磁石が磁石表層部と前記磁石表層部より内側にある磁石中央部とを有し、
磁極面を持つ磁石表層部における前記主相粒子の結晶配向度が磁石中央部における前記主相粒子の結晶配向度より低く、
前記磁石中央部の結晶配向度に対し、２％以上、結晶配向度が低下している層である低結晶配向度層を有することを特徴とするＲ−Ｔ−Ｂ系焼結磁石。 An RTB-based sintered magnet containing main phase particles composed of R 2 T 14 B crystals.
R is one or more rare earth elements, T is one or more transition metal elements that require Fe or Fe and Co, and B is boron.
The RTB-based sintered magnet has a magnet surface layer portion and a magnet central portion inside the magnet surface layer portion.
Degree of crystal orientation of the main phase grains in the magnet surface layer portion having a pole face is rather low than the crystal orientation of the main phase grains in the magnet central part,
An RTB-based sintered magnet having a low crystal orientation layer, which is a layer in which the crystal orientation is reduced by 2% or more with respect to the crystal orientation at the center of the magnet.
前記磁石表層部に含まれる前記主相粒子の一部が逆コアシェル主相粒子であり、
前記逆コアシェル主相粒子は、コア部およびシェル部を有し、
前記コア部における全ＲＨ濃度（ａｔ％）をＣＲＣ、
前記シェル部における全ＲＨ濃度（ａｔ％）をＣＲＳとした場合に、
ＣＲＣ／ＣＲＳ＞１．０である請求項１に記載のＲ−Ｔ−Ｂ系焼結磁石。 The R is one or more rare earth elements that require the heavy rare earth element RH.
A part of the main phase particles contained in the surface layer portion of the magnet is an inverted core shell main phase particle.
The reverse core-shell main phase particles have a core portion and a shell portion, and have a core portion and a shell portion.
The total RH concentration (at%) in the core part is C RC ,
All RH concentration at the shell portion (at%) in the case of the C RS,
The RTB -based sintered magnet according to claim 1, wherein C RC / C RS> 1.0.
前記低ＲＨ結晶相は、前記Ｒ２Ｔ１４Ｂ結晶からなり、前記ＲＨの濃度が前記主相粒子全体における前記ＲＨの濃度に対して相対的に低い相である請求項２に記載のＲ−Ｔ−Ｂ系焼結磁石。 The core portion contains a low RH crystal phase and contains
The R- according to claim 2 , wherein the low RH crystal phase comprises the R 2 T 14 B crystal, and the concentration of the RH is relatively low with respect to the concentration of the RH in the entire main phase particles. TB-based sintered magnet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/940,049 US10734143B2 (en) | 2017-03-30 | 2018-03-29 | R-T-B based sintered magnet |
| CN201810292680.7A CN108695033B (en) | 2017-03-30 | 2018-03-30 | R-T-B sintered magnet |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017069156 | 2017-03-30 | ||
| JP2017069156 | 2017-03-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2018174314A JP2018174314A (en) | 2018-11-08 |
| JP2018174314A5 true JP2018174314A5 (en) | 2021-04-22 |
| JP7035683B2 JP7035683B2 (en) | 2022-03-15 |
Family
ID=64107544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2018055202A Active JP7035683B2 (en) | 2017-03-30 | 2018-03-22 | RTB-based sintered magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7035683B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7167673B2 (en) * | 2018-12-03 | 2022-11-09 | Tdk株式会社 | Manufacturing method of RTB system permanent magnet |
| JPWO2021200873A1 (en) * | 2020-03-30 | 2021-10-07 | ||
| WO2023223532A1 (en) * | 2022-05-20 | 2023-11-23 | 三菱電機株式会社 | Rubber magnet and door packing for refrigerator |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6041203A (en) * | 1983-05-20 | 1985-03-04 | Hitachi Metals Ltd | Bonding magnet having excellent magnetic characteristic and manufacture thereof |
| JP3037699B2 (en) * | 1988-09-30 | 2000-04-24 | 日立金属株式会社 | Warm-worked magnet with improved crack resistance and orientation, and method of manufacturing the same |
| JP2904571B2 (en) * | 1990-10-29 | 1999-06-14 | 信越化学工業株式会社 | Manufacturing method of rare earth anisotropic sintered permanent magnet |
| WO1999007798A1 (en) | 1997-08-06 | 1999-02-18 | Daikin Industries, Ltd. | Water-based fluororubber coating composition |
| JP2002356701A (en) * | 2001-03-30 | 2002-12-13 | Sumitomo Special Metals Co Ltd | Rare earth alloy sintered compact and production method therefor |
| JP4924615B2 (en) * | 2006-11-30 | 2012-04-25 | 日立金属株式会社 | R-Fe-B fine crystal high-density magnet and method for producing the same |
| WO2012161355A1 (en) * | 2011-05-25 | 2012-11-29 | Tdk株式会社 | Rare earth sintered magnet, method for manufacturing rare earth sintered magnet and rotary machine |
| JP6044866B2 (en) * | 2011-09-29 | 2016-12-14 | 日立金属株式会社 | Method for producing RTB-based sintered magnet |
| JP6041203B2 (en) | 2012-11-02 | 2016-12-07 | 公立大学法人大阪市立大学 | Image search apparatus, image search method, and image search program |
| JP6424664B2 (en) * | 2015-02-16 | 2018-11-21 | Tdk株式会社 | Rare earth permanent magnet |
| JP6504044B2 (en) * | 2015-02-16 | 2019-04-24 | Tdk株式会社 | Rare earth permanent magnet |
-
2018
- 2018-03-22 JP JP2018055202A patent/JP7035683B2/en active Active
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