JP2015153813A - 希土類磁石の製造方法 - Google Patents
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Abstract
Description
図1a、図1bの順で本発明の希土類磁石の製造方法の第1のステップを説明した模式図であり、図1cは第2のステップを説明した模式図である。また、図3は本発明の希土類磁石の製造方法の第3のステップを説明した模式図である。また、図2aは図1bで示す焼結体のミクロ構造を説明した図であり、図2bは図1cの希土類磁石前駆体のミクロ構造を説明した図である。さらに、図4は製造された希土類磁石の結晶組織のミクロ構造を示した図であり、図5は図4における主相と粒界相をさらに拡大した図である。
本発明者等は、本発明の製造方法を適用し、磁石材料中のPrの濃度を種々変化させて複数の希土類磁石を製作し、改質合金の浸透温度とそれぞれの希土類磁石の保磁力の関係を特定する実験をおこなった。また、各希土類磁石の保磁力の温度依存性を特定する実験もおこなった。また、Pr置換率と常温、高温雰囲気下における保磁力の関係を特定する実験をおこなった。さらに、EDX分析をおこない、主相がコア−シェル構造を呈していることを確認した。
(Nd(100-x)Prx)13.2FebalB5.6Co4.7Ga0.5組成(at%)の液体急冷リボンを単ロール炉にて作製(X=0, 1.35, 25, 50, 100)し、得られた急冷リボンを焼結し焼結体を製作し(焼結温度:650℃、400MPa)、焼結体に強加工(加工温度:780℃、加工度:75%)を実施して希土類磁石前駆体を製作した。得られた希土類磁石前駆体に対し、図6で示す加熱経路図に従って熱処理をおこなってNd-Cu合金の浸透処理をおこない、希土類磁石を製作した(使用した改質合金はNd70Cu30材:5%、拡散前の磁石の厚みは2mm)。製作されたそれぞれの希土類磁石に対し、磁気特性評価をVSM、TPMにて評価した。改質合金の浸透温度と製造された希土類磁石の保磁力の関係に関する実験結果を図7に示し、浸透温度580℃におけるPr置換量と保磁力増加量の関係に関する実験結果を図8に示し、保磁力の温度依存性に関する実験結果を図9に示す。さらに、Pr置換率と常温、高温雰囲気下(200℃)における保磁力の関係に関する実験結果をそれぞれ図10,11に示す。
Claims (3)
- (Rl1-xR2x)aTMbBcMd (RlはYを含む1種以上の希土類元素、R2はRlと異なる希土類元素、TMはFe、Ni、Coの少なくとも1種以上を含む遷移金属、Bはホウ素、MはTi、Ga、Zn、Si、Al、Nb、Zr、Ni、Co、Mn、V、W、Ta、Ge、Cu、Cr、Hf、Mo、P、C、Mg、Hg、Ag、Auの少なくとも1種類以上で、0.01≦x≦1、 12≦a≦20、b=100-a-c-d、 5≦c≦20、0≦d≦3で、いずれもat%)の組成式で表され、主相と粒界相からなる組織を有する焼結体を製造する第1のステップ、
焼結体に熱間塑性加工を施して希土類磁石前駆体を製造する第2のステップ、
希土類磁石前駆体に対し、R3-M改質合金(R3はR1、R2を含む希土類元素)の融液を希土類磁石前駆体の粒界相に拡散浸透させて希土類磁石を製造する第3のステップからなる希土類磁石の製造方法。 - R1がNd、R2がPrからなる請求項1に記載の希土類磁石の製造方法。
- 第3のステップにおいて主相率が95%以上の希土類磁石を製造する請求項1または2に記載の希土類磁石の製造方法。
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JP2014024260A JP6003920B2 (ja) | 2014-02-12 | 2014-02-12 | 希土類磁石の製造方法 |
EP15152158.0A EP2908319B1 (en) | 2014-02-12 | 2015-01-22 | Method for producing rare-earth magnet |
US14/610,229 US10056177B2 (en) | 2014-02-12 | 2015-01-30 | Method for producing rare-earth magnet |
KR1020150020734A KR101661416B1 (ko) | 2014-02-12 | 2015-02-11 | 희토류 자석의 제조 방법 |
CN201510075585.8A CN104835641B (zh) | 2014-02-12 | 2015-02-12 | 稀土类磁铁的制造方法 |
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