成果報告書詳細
管理番号20120000000829
タイトル*平成23年度中間年報 希少金属代替材料開発プロジェクト/ NdーFeーB系磁石を代替する新規永久磁石の実用化に向けた技術開発/非平衡状態相の形成を利用したNd系磁石代替実用永久磁石の研究開発
公開日2012/7/5
報告書年度2011 - 2011
委託先名日産自動車株式会社 国立大学法人大阪大学 国立大学法人長崎大学 学校法人千葉工業大学 国立大学法人九州大学
プロジェクト番号P08023
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:
1. 研究開発の内容及び成果等
(国立大学法人長崎大学)
Nd-Fe-B 代替磁石の創製を念頭に、積層型SmCo5/α-Fe ナノコンポジット磁石のナノ組織と得られる磁気特性の関係をマイクロマグネティクス理論に基づく計算機シミュレーションにより検討した。
英文要約(Nagasaki University)
Micro-magnetic simulations were carried out for multi-layered SmCo5/-Fe nanocomposite magnets. The (BH)max value of 800 kJ/m3 was calculated for the magnet with the stacking period of 10 nm. This value is comparable with that achievable for Nd2Fe14B/-Fe nanocomposite magnets. Multi-layered SmCo5/-Fe nanocomposite magnets, which were composed of approximately 500 SmCo5/-Fe layers, were synthesized by PLD (Pulsed Laser Deposition) method. When the thickness of the stacking period of SmCo5/-Fe layers was decreased down to 20 nm, SmCo5 and -Fe layers coupled magnetically with each other, and behaved as one. The temperature coefficient of coercivity of the synthesized magnet was approximately -0.3%/C.
(Chiba Institute of Technology)
In the alloys without rare-earth elements, it was found that Co-Zr-Mo-B alloys produced by rapid solidification processing and subsequent annealing exhibited a high coercivity of 0.5 MA/m. On the other hand, Fe-Ni alloys produced by rapid solidification processing showed low coercivity values. In rare-earth containing alloys, Sm-Fe alloys produced by rapid solidification processing and subsequent annealing exhibited an extremely high coercivity over 2.0 MA/m.
(Osaka University, Daido Steel Co., Ltd.)
Sm2Fe17N3 powder was mechanically milled by a planetary ball mill. After milling for 24 h, partial decomposition of 2-17 phase was observed, and subsequent heat treatment promotes the decomposition. The holding time of heat treatment was also found to significantly affect the phase decomposition.
The composite samples of -Fe/SmCo5 which SmCo5 were combined with the Fe-Sn alloy prepared by the rapid-quenched solidification showed an effective rise of magnetization and the molding nature was also good in the binder action of Sn metal. On the other hand, -Fe/MnBi composite samples made from the rapid-quenched alloys in Mn-Bi and Fe-Sn systems, the temperature coefficient of coercive force was found to serve as positive in a range of room temperature and 150℃. A series of the composite magnets made from Sm2Fe17Mx (M=C and/or N), SmCo5, and Mn-Bi alloy were considered as composite magnets. For the metal-bonded magnets consisting of -Fe/SmCo5 or -Fe/MnBi as a main component and Sn as a binder, the coercive force more than 1.0 T as the research target was almost realized by optimizing their mixture composition.
(Kyusyu University)
We analyzed with TEM about FeNi and Co-Zr-B melt-spun ribbons made in Chiba Insti¬tute of Technology, and [SmCo5/Fe] superlat¬tice PLD films made in Nagasaki University.
The FeNi melt-spun ribbon consisted of [001]-aligned Fe50Ni50 columnar crystals with a diameter of about 1 μm. The columnar crystals possess a fcc disordered state. The Co-Zr-B melt-spun ribbons consisted mainly of fine Co5Zr crystal grains surrounded by amorphous grain boundary phase, and the grain size reduced to about 0.3 mm in diameter by adding B. The [SmCo5/Fe] film consisted of SmCo5-layers of about 11 nm in thickness and Fe-layers of about 7 nm in thickness. All of the Fe layers aligned the crystallographic [001] directions, but about 30% of Co is mixing near the interfaces.
(Nissan Moter Co., Ltd.)
 We measured the temperature dependence of magnetic properties in Nd magnets in order to show the specificatons of automobile magnets. From the results, we think that it is important to have the big temperature coefficient and high coercivity at high temperature about the developing magnets.
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