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1994 Fiscal Year Final Research Report Summary

Study on narocrystalline Fe-based alloys with high saturation magnetization

Research Project

Project/Area Number 04555166
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionInstitute for Materials Research

Principal Investigator

MASUMOTO Tsuyoshi  Tohoku Univ., Institute for Materials Research, Professor, 金属材料研究所, 教授 (20005854)

Co-Investigator(Kenkyū-buntansha) UENO Syuuji  Development Center, UNICHIKA Ltd., Researcher, 中央研究所, 研究員
SHIBUYA Kiyoshi  Steel Research Center, KAWASAKI STEEL Co., Ltd.Senior Researcher, 鉄鋼研究所, 主任研究員
NISHIYAMA Nobuyuki  Department of New Products Development, Teikoku Piston Ring Co., Ltd, Researcher, 新製品開発部, 研究員
MAKINO Akihiro  Development Center, ALPS Electruc Co., Ltd.Senior Researcher, 中央研究所, 研究開発主任
KIKUCHI Yoshio  Tohoku Univ., Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (30204837)
Project Period (FY) 1992 – 1994
Keywordssoft magnetic material / amorphous alloy / nanoscale bcc alloy / nanocrystallization / high magnetization / permeability / magnetostriction / core loss
Research Abstract

We carried out the fundamental study on the development of Fe-based soft magnetic materials with high saturation megnetization (Bs) above 1.6 T.As a result, the nanoscale bcc phase alloys obtained by partial crystallization of an amorphous phase in Fe-Co-Zr-Nb-B system were found to exhibit high Bs above 1.6 T,extremely high permeability (mue) of 10^5 at 1kHz and nearly zero magnetostriction (lambdas). The most appropriate composition was determined to be Fe-2at%Co-2%Zr-5%Nb-5%B.The use of this component enabled the production of long and wide amorphous sheets with 12 mm in width, 20 mum in thickness and more than 100 m in length by the single-roller quenching technique. This amorphous sheet had good bend ductility and ring-shape samples with 10 mm in diameter were prepared by mechanical punching. The annealing of the ring-shape samples for 3.6 ks at 873 K caused the formation of the nanocrystalline structure consisting of bcc particles with a diameter of 10 to 20 nm surrounded by the … More amorphous phase with a thickness of about 5 nm. The nanobeam compositional analyzes indicate that the Co element is enriched in the bcc particles while the Zr, Nb and B elements are segregated to the amorphous phase. The redistribution of the constituent elements was essential for the formation of the nanocrystalline structure leading to the appearance of the good soft magnetic properties combined with high Bs. We also pointed out that the particle size and interparticle spacing of the bcc particles were smaller than the width of magnetic domain wall and the nanoscale mixed structure enabled the achievement of the exchange interaction for the appearance of ferromagnetism. Subsequently, the nanocrystalline ring-shape sheets were laminated with epoxy resin for the purpose of application, and the core losses and mue as a function of frequency in a range of 50 Hz to 10 MHz were measured for the laminated sheets. As a result, the laminated sheets were found to exhibit much better soft magnetic properties as compared with those for conventional Fe-3 mass%Si steel and Fe-Si-B amorphous sheets because of the simultaneous satisfaction of high Bs and zero lambdas. Consequently, the present nanoscale bcc alloys are expected to be used as a new type of soft magnetic material with high Bs. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] M. Nakamura: "High-Relolution Electron Microscopy Study of Microstructural Changes in Magnetic Fe-Nb-B Films in the Course of Annealing" Materials Science and Engineering. A179 A180. 487-490 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Makino: "Magnetic Core Properties and Their Thermal Stability in a bcc Fe-Zr-B-Cu Alloy with Nanoscale Grain Size" Electrical Engineering in Japan. 113. 559-566 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Makino: "Magnetic Properties and Microstructure of Nanocrystalline bcc Fe-M-B(M=Zr,Hf,Nb)Alloys" Journal of Magnetism and Magnetic Materials. 133. 329-333 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Kawamura: "Nanocrystalline Fe86 Zr7B6Cu1 Soft-Magnetic Cores Produced by Hot-Pressing Amorphous Powder" PM'94 Magnetic Materials. 1695-1698 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Kawamura: "Faburication of Nanocrystalline Fe86Zr7B6Cu1 Soft-Magnetic Compacts with High Saturation Magnetization" Journal of Applied PHysics. 76. 5554-5551 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J. Saida: "The Formation of NanostructuredMaterials by Consolidating Ultrafine Amorphous Alloy Particles Prepared by Chemical Reduction" Materials Science and Engineering. A179 A180. 632-636 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakamura, Y.Horitsu, K.Anazawa, A.Makino A.Inoue and T.Masumoto: ""High-Relolution Electron Microscopy Study of Microstructural Changes in Magnetic Fe-Nb-B Films in the Course of Annealing"" Meterials Science and Engineering. A179/A180. 487-490 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Makino, K.Suzuki, A.Inoue and T.Masumoto: ""Magnetic Core Properties and Their Thermal Stability in a bcc Fe-Zr-B-Cu Alloy with Nanoscale Grain Size"" Electrical Engineering in Japan. 113. 559-566 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Makino, K.Suzuki, A.Inoue, Y.Hirotsu and T.Msumoto: ""Magnetic Properties and Microstructure of Nanocrystalline bcc Fe-M-B(M=Zr, Hf, Nb)Alloys"" Journal of Magnetism and Magnetic Materials. 133. 329-333 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kawamura, A.Inoue, A.Kojima and T.Masumoto: ""Nanocrystalline Fe_<86>Zr_7B_6Cu_1 Soft-Magnetic Cores Produced by Hot-Pressing Amorphous Powder"" PM'94 Magnetic Materials. 1695-1698 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kawamura, A.Inoue, K.Kojima and T.Masumoto: ""Fabrication of Nanocrystalline Fe_<86>Zr_7B_6Cu_1 Soft-Magnetic Compacts with High Saturation Magnetization"" Journal of Applied Physics. 76. 5545-5551 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Saida, A.Inoue and T.Masumoto: ""The Formation of Nanostructured Materials by Consolidating Ultrafine Amorphous Alloy Particles Prepared by Chemical Reduction" Meterials Science and Engineering. A179/A180. 632-636 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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