JP7110662B2 - R‐t‐b系焼結磁石 - Google Patents
R‐t‐b系焼結磁石 Download PDFInfo
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- 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
- H01F1/0576—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 pressed, e.g. hot working
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Description
0.3≦[R]/[T]≦0.5 (1)
0.2≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2)
0.4≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2‐1)
0.3≦[R’]/[T’]≦0.5 (1’)
本実施形態に係る焼結磁石は、少なくとも希土類元素(R)、遷移金属元素(T)、ホウ素(B)、ガリウム(Ga)及び酸素(O)を含有する。
0.3≦[R’]/[T’]≦0.5 (1’)
[R’]は、磁石素体4に含まれる粒界相1中のRの含有量である。[T’]は、磁石素体4に含まれる粒界相1中のFe及びCoの含有量の合計である。[R’]及び[T’]其々の単位は、原子%である。遷移金属リッチ相3における[R’]/[T’]は、Rリッチ相5における[R’]/[T’]よりも小さい。遷移金属リッチ相3は、Tとして、Fe及びCoのうちFeのみを含んでよい。遷移金属リッチ相3は、Tとして、Fe及びCoの両方を含んでもよい。
0.3≦[R]/[T]≦0.5 (1)
0.2≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2)
0.32≦[R]/[T]≦0.48 (1‐1)
0.4≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2‐1)
0.45≦[O]/([R]+[T]+[Ga]+[O])≦0.59 (2‐2)
以下では、上述の焼結磁石の製造方法が説明される。
(実施例1)
ストリップキャスティング法により、原料合金として、合金Aを原料金属から作製した。合金Aの組成は、下記表1に示される組成に調整された。
実施例2~11では、原料合金として、下記表1及び表2に示される合金を作製した。実施例2~11其々の第二時効処理の時間t2は、下記表2に示される。実施例2~11では、第一時効処理及び第二時効処理の後に焼結体を加工し、焼結体の加工後に洗浄工程を実施し、洗浄工程後にクラック導入熱処理を実施し、クラック導入熱処理後に熱酸化処理工程を実施した。
比較例1では、洗浄工程、クラック導入熱処理工程及び酸化熱処理工程を実施しなかった。
以下の方法で、各実施例及び比較例1の焼結磁石の断面の組成を分析した。
0.3≦[R’]/[T’]≦0.5 (1’)
[R’]は、磁石素体4に含まれる粒界相中のR(Nd及びPr)の含有量である。
[T’]は、磁石素体4に含まれる粒界相中のFe及びCoの含有量の合計である。
0.3≦[R]/[T]≦0.5 (1)
0.2≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2)
[R]は、酸化物相3A中のR(Nd及びPr)の含有量である。
[T]は、酸化物相3A中のFe及びCoの含有量の合計である。
[Ga]は、酸化物相3A中のGaの含有量である。
[O]は、酸化物相3A中のOの含有量である。
以下の方法で、各実施例及び比較例1の焼結磁石の最表面(つまり酸化層の表面)の組成を、上述のSEM及びEDSで個別に分析した。一例として、SEMで撮影された実施例4の焼結磁石の最表面の写真は、図7に示される。図7において色が濃い部分は、酸化された主相粒子であり、図7において色が薄い部分は、主相粒子の間に位置する粒界相(粒界多重点)である。
ライブタイム: 60秒
実時間: 96.6秒
プロセスタイム: 6
エネルギー範囲: 20keV
チャンネル数: 2048
チャンネル当たりのエネルギー: 10eV
加速電圧: 15kV
倍率: 2500
ワーキングディスタンス: 11.5mm
試料傾斜角: 0度
0.3≦[R]/[T]≦0.5 (1)
0.2≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2)
実施例1~11及び比較例1其々の焼結磁石の耐食性を、飽和プレッシャークッカーテスト(Pressure Cooker Test:PCT)により評価した。PCTでは、0.2MPa、温度120℃、湿度100%RHである環境下に各焼結磁石を1000時間放置した。1000時間後の各焼結磁石の重量の減少量を測定した。実施例1~11其々の焼結磁石の単位表面積あたりの重量減少量ΔW(単位:mg/cm2)は、表2に示される。ΔWが小さいほど、焼結磁石は耐食性に優れている。下記表1に示されるように、比較例1の焼結磁石は、PCT中に著しく腐食してしまい、1000時間に達する前に崩壊した。
Claims (4)
- 希土類元素R、遷移金属元素T、B、Ga及びOを含有するR‐T‐B系焼結磁石であって、
前記R‐T‐B系焼結磁石は、Rとして、Nd及びPrのうち少なくとも一種を含有し、
前記R‐T‐B系焼結磁石は、Tとして、Fe及びCoのうち少なくともFeを含有し、
前記R‐T‐B系焼結磁石は、磁石素体と、前記磁石素体の少なくとも一部を覆う酸化層と、を備え、
前記磁石素体は、
R2T14Bの結晶を含有する複数の主相粒子と、
少なくとも二つの前記主相粒子の間に位置し、且つRを含有する粒界相と、
を含み、
前記酸化層は、R、T、Ga及びOを含有する複数の酸化物相を含み、
前記酸化物相中のRの含有量が、[R]原子%であり、
前記酸化物相中のFe及びCoの含有量の合計が、[T]原子%であり、
前記酸化物相中のGaの含有量が、[Ga]原子%であり、
前記酸化物相中のOの含有量が、[O]原子%であり、
前記酸化物相が、下記式(1)及び下記式(2‐1)を満たし、
前記酸化層に含まれる少なくとも一部の前記酸化物相が、前記磁石素体に含まれる少なくとも一部の前記粒界相を覆っている、
R‐T‐B系焼結磁石。
0.3≦[R]/[T]≦0.5 (1)
0.4≦[O]/([R]+[T]+[Ga]+[O])≦0.7 (2‐1) - 前記酸化層は、
複数の酸化された前記主相粒子と、
少なくとも三つの酸化された前記主相粒子に囲まれた粒界相である複数の粒界多重点と、を含み、
前記酸化層の表面に露出する全ての前記粒界多重点の数Mに対する、前記酸化物相を含む前記粒界多重点の数mの割合m/Mが、0.2以上0.7以下である、
請求項1に記載のR‐T‐B系焼結磁石。 - 前記R‐T‐B系焼結磁石中のRの含有量が、30質量%以上33質量%以下であり、
前記R‐T‐B系焼結磁石中のBの含有量が、0.72質量%以上0.95質量%以下であり、
前記R‐T‐B系焼結磁石中のGaの含有量が、0.4質量%以上1.5質量%以下である、
請求項1又は2に記載のR‐T‐B系焼結磁石。 - 前記磁石素体に含まれる前記粒界相中のRの含有量が、[R’]原子%であり、
前記磁石素体に含まれる前記粒界相中のFe及びCoの含有量の合計が、[T’]原子%であり、
前記磁石素体に含まれる少なくとも一部の前記粒界相が、R、T及びGaを含有し、且つ下記式(1’)を満たす遷移金属リッチ相であり、
少なくとも一部の前記遷移金属リッチ相が、前記酸化物相によって覆われている、
請求項1~3のいずれか一項に記載のR‐T‐B系焼結磁石。
0.3≦[R’]/[T’]≦0.5 (1’)
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JP2018062776A JP7110662B2 (ja) | 2018-03-28 | 2018-03-28 | R‐t‐b系焼結磁石 |
US16/364,443 US11145444B2 (en) | 2018-03-28 | 2019-03-26 | R-T-B-based sintered magnet |
CN201910238251.6A CN110323019B (zh) | 2018-03-28 | 2019-03-27 | R-t-b系烧结磁铁 |
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WO2021205580A1 (ja) * | 2020-04-08 | 2021-10-14 | 三菱電機株式会社 | 希土類焼結磁石および希土類焼結磁石の製造方法、回転子並びに回転機 |
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CN107077965B (zh) * | 2015-07-30 | 2018-12-28 | 日立金属株式会社 | R-t-b系烧结磁体的制造方法 |
JP6759649B2 (ja) * | 2016-03-23 | 2020-09-23 | Tdk株式会社 | 希土類磁石及びモーター |
JP7387992B2 (ja) * | 2019-03-20 | 2023-11-29 | Tdk株式会社 | R-t-b系永久磁石 |
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