JP7194780B2 - 改良型焼結ネオジム鉄ボロン鋳片の調製方法 - Google Patents
改良型焼結ネオジム鉄ボロン鋳片の調製方法 Download PDFInfo
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Description
ステップ1.1、核生成補助合金粒子の元素重量比の範囲がそれぞれPr-Nd26.68~28%、Fe70~72.5%、B0.90~1%であり、その中で、前記Pr-Ndの2つの元素におけるPr元素の割合が0~30重量%である。核生成補助合金粒子におけるFe元素はCo元素の一部で置換可能であり、A材中のCo元素の割合は0~5重量%である。従来の準備、製錬、鋳造により、組成比率が(Pr-Nd)2Fe14Bに近い合金板を得て、当該合金片が主に正方晶相であり、ネオジムリッチ相は非常に少なく、粒径は5~30μmである。
ステップ2.1核生成補助合金粒子は最終的に材料に添加され、核生成補助合金の添加は最終合金組成に影響を与えるため、最終的なネオジム鉄ボロン鋳片組成を得るには、まず、核生成補助合金粒子を添加する前の材料の組成、即ち中間材料の組成を設計し、計算する必要がある。核形成補助合金は、重量比3~6%で添加され、好ましくは5%である鋳片グレードに応じた合金組成を設計する。
1.核形成補助合金の元素組成の重量比範囲は、Pr-Nd26.68~28%、Fe70~72.5%、B0.90~1%であり、当該組成比率は、核形成補助合金がNd2Fe14B正方晶相を主とし、ネオジムリッチ相が基本的に存在しない、粒度が比較的に大きく5~30umであることを決定する;破砕後、(Pr-Nd)2Fe14B合金粒子が得られる;核生成点として正方晶系核形成補助合金を使用すると、鋳造プロセス中にネオジム鉄ホウ素鋳片に正方晶系柱状結晶が形成されやすくなる。
実施例1:
中間材は、最終的なネオジム鉄ボロン鋳片(材料C)の95%を占めている。最終的なネオジム鉄ボロン鋳片(材料C)の設計(重量比)はPr-Nd26Dy4.2FebalCo1.58B0.98M0.90(M=Al、Cu、Nb、Ga)である。
実施例2:
最終的な配合処方(材料C)の設計(重量比)はPr-Nd29.4Tb1FebalCo2.0B0.93M0.55(M=Al、Cu、Zr、Ga)である。
Claims (5)
- 改良型焼結ネオジム鉄ボロン鋳片の調製方法であって、当該方法の具体的なプロセスには、
核生成補助合金粒子の元素重量比の範囲がそれぞれPr-Nd26.68~28%、Fe70~72.5%、B0.82~1%であり、その中で、前記Pr-Ndの2つの元素におけるPrの割合が、0~30重量%であり;従来の準備、製錬、鋳造により、組成比率が(Pr-Nd)2Fe14Bに近い合金板を得るステップ1.1と、
前記合金板から破砕された直径1~10mmの粒子を、焼結ネオジム鉄ボロン鋳片用の核生成補助合金粒として使用するステップ1.2と、
を含む、まず、焼結ネオジム鉄ボロン鋳片用の核生成補助合金粒子を準備するステップ1と、
準備するネオジム鉄ボロン鋳片のグレードと核生成補助合金粒子の添加量に応じて中間材料の組成比率を設計し、その中で、核生成補助合金粒子の添加量が、3~6重量%であるステップ2.1と、
前記中間材料が配合された後、通常の焼結ネオジム鉄ホウ素製錬プロセスに従って製錬し、溶鋼に溶解してから精錬し、すべてが溶解した後、前記核生成補助合金粒子を添加し、添加後の電力を150~250KW減少させ、3~15分間製錬してから鋳造して、最終的なネオジム鉄ボロン鋳片を得るステップ2.2と、
を含むネオジム鉄ボロン鋳片を準備するステップ2と、を含むことを特徴とする改良型焼結ネオジム鉄ボロン鋳片の調製方法。 - ステップ1.2では、前記核生成補助合金粒子が機械的破砕法又は水素破砕法によって得られることを特徴とする請求項1に記載の改良型焼結ネオジム鉄ボロン鋳片の調製方法。
- 前記水素破砕法を使用する場合は、脱水素は可能な限り十分である必要があり、前記核形成補助合金粒子中の水素含有量が1000ppm未満であることを特徴とする請求項2に記載の改良型焼結ネオジム鉄ボロン鋳片の調製方法。
- ステップ2.1では、前記核生成補助合金粒子が5%の重量比で追加されることを特徴とする請求項1~3のいずれか一項に記載の改良型焼結ネオジム鉄ボロン鋳片の調製方法。
- ステップ1.1では、前記核生成補助合金粒子におけるFe元素はCo元素の一部で置換可能であり、A材料中のCo元素の割合は0~5重量%であることを特徴とする請求項1~3のいずれか一項に記載の改良型焼結ネオジム鉄ボロン鋳片の調製方法。
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CN103617855A (zh) | 2013-11-30 | 2014-03-05 | 宁波科星材料科技有限公司 | 一种具有优良磁体性能的钕铁硼磁性材料 |
WO2014156181A1 (ja) | 2013-03-29 | 2014-10-02 | 中央電気工業株式会社 | R-t-b系磁石用原料合金およびその製造方法 |
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US5064465A (en) * | 1990-11-29 | 1991-11-12 | Industrial Technology Research Institute | Process for preparing rare earth-iron-boron alloy powders |
JPH05339683A (ja) * | 1992-06-11 | 1993-12-21 | Hitachi Metals Ltd | 永久磁石合金およびその製造方法 |
US7846273B2 (en) * | 2005-10-31 | 2010-12-07 | Showa Denko K.K. | R-T-B type alloy, production method of R-T-B type alloy flake, fine powder for R-T-B type rare earth permanent magnet, and R-T-B type rare earth permanent magnet |
CN103103442A (zh) * | 2013-02-28 | 2013-05-15 | 包头稀土研究院 | 主辅合金法制备钕铁硼的方法 |
CN104752048B (zh) * | 2013-12-30 | 2017-10-31 | 北京中科三环高技术股份有限公司 | 一种烧结钕铁硼永磁体的制作方法 |
CN105845425A (zh) * | 2016-01-08 | 2016-08-10 | 宁波宏垒磁业有限公司 | 一种钕铁硼磁体的制备方法 |
CN106128673B (zh) * | 2016-06-22 | 2018-03-30 | 烟台首钢磁性材料股份有限公司 | 一种烧结钕铁硼磁体及其制备方法 |
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