成果報告書詳細
管理番号20110000001149
タイトル*平成22年度中間年報 希少金属代替材料開発プロジェクト/Nd~Fe~B系磁石を代替する新規永久磁石の研究
公開日2011/9/9
報告書年度2010 - 2010
委託先名国立大学法人東北大学
プロジェクト番号P10028
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 研究開発項目(1)「窒化鉄系材料の合成とその基礎特性」 (1)-1 窒化鉄ナノ粒子の直接合成技術の構築 (担当:東北大学高橋研、京都大学、戸田工業、帝人) 溶媒中の窒化を意図した改良型の低温熱分解法では、熱平衡相窒化鉄を含んだ粒径10~13nmの強磁性窒化鉄ナノ粒子が得られた。 (1)-2 窒化鉄ナノ粒子の間接合成技術の構築(担当:東北大学高橋研、京都大学、戸田工業) 戸田工業、京都大学より提供された原料を用いて、前躯体の作製と熱処理の最適化技術の確立を行った。
英文要約Our final goal is to establish (i) direct/indirect synthesis of Fe-N nanoparticles (NPs) with alpha-double-prime single phase, (ii) basic technology for high performance R-Fe-N magnets, (iii) guiding principle for new magnetic materials and (iv) characterization and analysis of motor application. (i) By applying modified thermal decomposition method in solvent, 10nm – 13 nm in diameter of Fe-N NPs with thermal equilibrium phase were obtained. And home-made precursors and uniquely modified annealing process has demonstrated 230 emu/g of saturation magnetization for Fe-N NPs with alpha-double-prime single phase by optimizing gas type, gas flow rate, annealing temperature annealing time and sample weight. (ii) For a Sm-Fe-N metal bond magnet, Zn or Zn-Ga additives could play a role of a binder with low melting point, resulting in higher coercivity than that without the additives. And, for Sm-Fe-N with 5% of Zn additives, 27.9 kOe of coercivity could be achieved without less magnetization by reducing the average size of the magnet powder from 66 micrometer to 7 micrometer, whose value was above our target of 20 kOe. Furthermore, our developed sintering process under complex fields such as mechanical force, electromagnetic fields and so on was applied to Sm-Fe-N magnet powder, succeeding in fabrication of the isotropic sintered Sm-Fe-N magnet with 90 % up of sintering density and 16.1 MGOe of maximum energy product. While, our uniquely developed ultra-high pressure process could synthesize Fe-Sn alloy with new magnetic phase. (iii) Based on the first principle calculation, substitution effect of third element into alpha-double-prime Fe-N material on magnetic properties has revealed a remarkable enhancement of the magneto-crystalline anisotropy energy with minimal decrease in saturation magnetization. (iv) Our uniquely developed finite element method (FEM) analysis has suggested 40 % powerful torque of main drive motor by applying new Fe-N based magnet instead of conventional Nd-Fe-B permanent magnet. Also optimized wire-wound and rotator structures inside the motor equipping with the new Fe-N based magnet had advantages of torque and demagnetization properties.
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