JP2015122517A - NdFeB焼結磁石及びその製造方法 - Google Patents
NdFeB焼結磁石及びその製造方法 Download PDFInfo
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Abstract
【解決手段】NdFeB磁石の主相粒子に希土類リッチ相が付着した微粉を作製し、それを焼結することにより金属状態の希土類の量が原子比で12.7%〜16.0%であるNdFeB磁石の基材を作製し、該基材の表面にDy又は/及びTbを含む金属又は合金の粉体を塗布して所定温度に加熱することにより、Dy又は/及びTbを該基材内に該基材の表面から1cm2あたり10mg以上拡散させる粒界拡散処理を行う。
【選択図】図2
Description
NdFeB焼結磁石の基材の粒界にDy又は/及びTb(RH)を粒界拡散法により拡散させたものであって、
前記基材における金属状態の希土類の量が原子比で12.7%〜16.0%であり、
前記基材の粒界において、希土類リッチ相が、該基材の表面と該表面から2.5mmの深さまでの間で繋がっており、
前記粒界拡散法により拡散させたRHが存在する粒界が表面から2.5mmの深さまで達している、
ことを特徴としている。
まず、ストリップキャスト法を用いてNdFeB磁石の合金を作製した。次に、この合金を水素解砕法により粗粉砕した後、得られた粗粉に潤滑剤を混合し、ホソカワミクロン製100AFG型ジェットミル装置で窒素ガス気流中で粗粉を微粉砕することにより、NdFeB磁石の粉末を得た。その際、微粉砕後の粉末の粒径は、レーザ回折法で測定した粒度分布の中央値(D50)で5μmになるように調整した。次に、この粉末に潤滑剤を混合し、この粉末を充填容器に3.5〜3.6g/cm3の密度で充填した。そして、磁界中で粉末を配向させた後、真空中で1000〜1020℃で加熱することにより焼結した。更に不活性ガス雰囲気中において800℃で1時間加熱した後に急冷し、更に500〜550℃で2時間加熱して急冷した。これにより、RHを拡散する前のNdFeB焼結磁石のブロック(以下、「基材」と呼ぶ)が得られた。
ここで粉末塗布を磁極面のみに限定した理由は次のとおりである。本発明は比較的大型のモータへの応用を目指しているので、ある程度大きい磁極面積を持つ磁石に対して有効な技術でなくてはならない。ところが磁化曲線測定器(パルス磁界印加による測定)の都合で磁極面積に制限がある。そこで、7mm角という比較的小さい磁極面積の試料を使用するが、側面に粉末を塗布しないことにより、大きい磁極面積の試料について粒界拡散法の実験をするときの状況と同じになるようにした。
11…主相
12…希土類リッチ相ラメラ
13…微粉粒子
14…希土類リッチ相ラメラの一部
Claims (3)
- NdFeB磁石の主相粒子に希土類リッチ相が付着した微粉を作製し、それを焼結することにより金属状態の希土類の量が原子比で12.7%〜16.0%であるNdFeB磁石の基材を作製し、
該基材の表面にDy又は/及びTbを含む金属又は合金の粉体を塗布して所定温度に加熱することにより、Dy又は/及びTbを該基材内に該基材の表面から1cm2あたり10mg以上拡散させる粒界拡散処理を行う、
ことを特徴とするNdFeB焼結磁石製造方法。 - 主相内に前記微粉の目標平均粒径と略等しい平均間隔で希土類リッチ相のラメラが形成された出発合金塊を作製し、該出発合金塊を、平均粒径が前記目標平均粒径になるように粉砕することにより前記微粉を作製することを特徴とする請求項1に記載のNdFeB焼結磁石製造方法。
- 前記出発合金塊をストリップキャスト法により作製することを特徴とする請求項2に記載のNdFeB焼結磁石製造方法。
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JP5687621B2 (ja) | 2015-03-18 |
JP6005768B2 (ja) | 2016-10-12 |
CN102483979A (zh) | 2012-05-30 |
US20170103851A1 (en) | 2017-04-13 |
EP2453448A1 (en) | 2012-05-16 |
WO2011004894A1 (ja) | 2011-01-13 |
CN102483979B (zh) | 2016-06-08 |
US9589714B2 (en) | 2017-03-07 |
CN106098281B (zh) | 2019-02-22 |
EP2453448A4 (en) | 2014-08-06 |
CN106098281A (zh) | 2016-11-09 |
JPWO2011004894A1 (ja) | 2012-12-20 |
US20120176211A1 (en) | 2012-07-12 |
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