JP2019186331A - Nd−Fe−B系磁石の製造方法 - Google Patents
Nd−Fe−B系磁石の製造方法 Download PDFInfo
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- 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
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Abstract
Description
Nd−Fe−B系磁石組成であって、
希土類元素、並びに、Fe、Ni、Co、B、N及びC以外の元素の合計の重量%をRwとし、
Fe、Ni及びCoの合計の重量%をTwとし、
B、N及びCの合計の重量%をBwとしたとき、
Tw/(Rw×Bw)が2.26〜2.50であるNd−Fe−B系磁石組成を有し、主相と粒界相を含む組織を有する焼結体を製造する焼結体製造工程、並びに、
焼結体を、580〜640℃の低温域と660℃以上の高温域で熱処理する熱処理工程
を含む。
本発明で用いる原料組成は、Tw/(Rw×Bw)(Tw/Rw/Bwと表すこともある)が2.26〜2.50であるNd−Fe−B系磁石組成である。この組成を有するNd−Fe−B系磁石組成から製造した焼結体を、後述する熱処理工程により熱処理した場合に、驚くべきことに、磁気特性に優れた、具体的には、残留磁束密度の高いNd−Fe−B系磁石を製造することができる。
RaTMbBcM1dM2e
(Rは1種以上の希土類元素、TMはFe、Ni及びCoの少なくとも1種以上、Bはホウ素、M1はTi、Ga、Zn、Si、Al、Nb、Zr、Mn、V、W、Ta、Ge、Cu、Cr、Hf、Mo、P、Mg、Hg、Ag及びAuの少なくとも1種類以上、M2はN及びCの少なくとも1種以上であり、12≦a≦20、b=100−a−c−d−e、5≦c≦20、0≦d≦3、0≦e≦3で、いずれもat%)
の組成式で表される。
TMは、好ましくは、少なくともFeを含む。
dは、好ましくは、0≦d≦1.5を満たす。
eは、好ましくは、0≦e≦1を満たす。
焼結体製造工程は、典型的には、上記の特徴を有するNd−Fe−B系磁石組成の溶湯を急冷して、ナノ結晶を含む組織(ナノ結晶組織)を有する急冷薄帯を形成すること、並びに、得られた急冷薄帯又は急冷薄帯の粉砕物を焼結することを含む。
焼結体製造工程で得られた焼結体は、後述する熱処理工程に供することができるが、熱処理工程に供する前に、焼結体に対し熱間塑性加工(圧延、鍛造、押出加工等)を施すことが好ましい。
熱処理工程は、焼結体製造工程で得られた焼結体に対し、必要に応じて熱間塑性加工を施した後に、580〜640℃の低温域での熱処理と、660℃以上の高温域での熱処理とを行う工程である。
表1に示す1〜22の元素組成の合金を調製した。
表1に示す各組成の原料を用い、表2に示す条件でのCu単ロール法による液体急冷法でNdFeBナノ結晶リボン180gを1ロットずつ作製した。
上記で得られたNdFeBナノ結晶リボンを粗粉砕し、粗粉砕物から表3に示す固化条件で加圧しながら固化し焼結して焼結体を得た。
上記で得られた焼結体について以下の条件で熱間塑性加工による配向制御を行い、熱間塑性加工後の焼結体、すなわち磁石前駆体、を作製した。
上記で得られた磁石前駆体に対し、表5に示す二段階の熱処理(時効)を施して、Nd−Fe−B系磁石を形成した。
熱処理の第1段階終了後と第2段階終了後の各Nd−Fe−B系磁石試料について4mm×4mm×2mm(磁化容易方向)の形状に加工し8Tで着磁した後、VSM(振動試料型磁力計)により残留磁束密度(Br)を測定した。
Claims (2)
- Nd−Fe−B系磁石組成であって、
希土類元素、並びに、Fe、Ni、Co、B、N及びC以外の元素の合計の重量%をRwとし、
Fe、Ni及びCoの合計の重量%をTwとし、
B、N及びCの合計の重量%をBwとしたとき、
Tw/(Rw×Bw)が2.26〜2.50であるNd−Fe−B系磁石組成を有し、主相と粒界相を含む組織を有する焼結体を製造する焼結体製造工程、並びに、
焼結体を、580〜640℃の低温域と660℃以上の高温域で熱処理する熱処理工程
を含む、Nd−Fe−B系磁石の製造方法。 - 焼結体製造工程の後であって熱処理工程の前に、焼結体に熱間塑性加工を施す熱間塑性加工工程を更に含む、請求項1に記載の方法。
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JP2018073494A JP2019186331A (ja) | 2018-04-05 | 2018-04-05 | Nd−Fe−B系磁石の製造方法 |
US16/359,507 US20190311851A1 (en) | 2018-04-05 | 2019-03-20 | Method of producing nd-fe-b magnet |
CN201910268250.6A CN110349743A (zh) | 2018-04-05 | 2019-04-04 | Nd-Fe-B系磁体的制造方法 |
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JP2018073494A JP2019186331A (ja) | 2018-04-05 | 2018-04-05 | Nd−Fe−B系磁石の製造方法 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117438207A (zh) * | 2023-12-20 | 2024-01-23 | 江西金力永磁科技股份有限公司 | 一种提升高牌号烧结钕铁硼磁体表面镀层结合力的方法 |
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JPS6230847A (ja) * | 1985-08-01 | 1987-02-09 | Sumitomo Special Metals Co Ltd | 永久磁石材料の製造方法 |
JPS6439320A (en) * | 1987-08-03 | 1989-02-09 | Tdk Corp | Production of permanent magnet |
JPH02298003A (ja) * | 1989-05-12 | 1990-12-10 | Fuji Elelctrochem Co Ltd | 希土類永久磁石の製造方法 |
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US20170236626A1 (en) * | 2015-08-13 | 2017-08-17 | Beijing Zhong Ke San Huan Hi-Tech Co., Ltd. | Rare earth permanent magnet and method for preparing same |
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US6790296B2 (en) * | 2000-11-13 | 2004-09-14 | Neomax Co., Ltd. | Nanocomposite magnet and method for producing same |
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US10784028B2 (en) * | 2016-02-26 | 2020-09-22 | Tdk Corporation | R-T-B based permanent magnet |
-
2018
- 2018-04-05 JP JP2018073494A patent/JP2019186331A/ja not_active Ceased
-
2019
- 2019-03-20 US US16/359,507 patent/US20190311851A1/en not_active Abandoned
- 2019-04-04 CN CN201910268250.6A patent/CN110349743A/zh active Pending
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JPS6439320A (en) * | 1987-08-03 | 1989-02-09 | Tdk Corp | Production of permanent magnet |
JPH02298003A (ja) * | 1989-05-12 | 1990-12-10 | Fuji Elelctrochem Co Ltd | 希土類永久磁石の製造方法 |
JPH0499816A (ja) * | 1990-08-17 | 1992-03-31 | Fuji Elelctrochem Co Ltd | 希土類永久磁石の製造方法 |
JP2011222966A (ja) * | 2010-03-24 | 2011-11-04 | Tdk Corp | 希土類磁石用合金及び希土類磁石用合金の製造方法 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN117438207A (zh) * | 2023-12-20 | 2024-01-23 | 江西金力永磁科技股份有限公司 | 一种提升高牌号烧结钕铁硼磁体表面镀层结合力的方法 |
CN117438207B (zh) * | 2023-12-20 | 2024-04-12 | 江西金力永磁科技股份有限公司 | 一种提升高牌号烧结钕铁硼磁体表面镀层结合力的方法 |
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