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Development of Spring-type Magnet in Nitrogen Contained Rare-earth-Fe Compounds

Research Project

Project/Area Number 06650768
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Structural/Functional materials
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SUGIMOTO Satoshi  Tohoku University, Fac. of Engineering, Assoc. Prof., 工学部, 助教授 (10171175)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Hajime  Tohoku University, Fac. of Engineering, Res. Assoc., 工学部, 助手 (40250716)
HOMMA Motofumi  Tohoku University, Fac. of Engineering, Prof., 工学部, 教授 (50005261)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsnitrogen contained compound / exchange-spring magne / anncaling for crystallization / nitriding / coercivity / melt-spinning / メルトスパン / Sm_2Fe_<17>N_x系化合物 / ThMn_<12>型化合物 / 交換スプリングマグネット / 結晶化過程
Research Abstract

Possibility of the exchange-spring magnets in Sm-Fe-(C,N) and Nd-Fe-Mo-N systems has been studied by preparing the microduplex structure consisting of a nanocrystalline soft magnetic alpha-Fe phase and a hard magnetic Sm_2Fe_<17> (C,N) _x and Nd (Fe, Mo) _<12>N_x phase. In this study, the microduplex structure was prepared by annealing the melt-spun ribbons with amorphous state. The magnetic properties of annealed Sm_yFe_<95-y>C_5 (y=5-10) ribbons after nitriding, whose Sm content was lower than the stoichiometric composition of Sm_2Fe_<17>C,were investigated in correlation with their microstructures. In as-spun state, Sm_<7-10>Fe_<85-88>C_5 (y=7-10) ribbons consist only of amorphous phase, while in the Sm_5Fe_<90>C_5 (y=5) and Sm_6Fe_<91>C_5 (y=6) ribbons an alpha-Fe phase is also observed. The alpha-Fe phase in the ribbons with y=5 and 6 can be formed by the crystallization during melt-quenching. In all cases, the amorphous phase disappears after the annealing above 600゚C,resulting i … More n the microduplex structure with alpha-Fe and Sm_2Fe_<17>C_x phases. Relatively high coercivities were observed in Sm_<7-10>Fe_<85-88>C_5 ribbons after annealing and subsequent nitriding. Especially, Sm_7Fe_<88>C_5 ribbon annealed at 600゚C for 5min and subsequently nitrided at 450゚C for 4h exhibits the coercivity of 269kAm^<-1> with the maximum energy product of 70.1kJm^<-3>. In Nd-Fe-Mo-N melt-spun ribbons, the crystallization temperatures of Nd (Fe, Mo) _<12> phase with ThMn12-type structure and alpha-Fe phase are at around 600゚C and 500゚C,respectively. Nd_<0.9>Fe_<11>Mo_<0.9>N_X ribbon after heat treatment at 900゚C for 30 min and subsequent nitriding at 550゚C for 4h exhibits coercivity of 240kAm^<-1>. The V addition increases coercivity and the highest coercivity of 312kAm^<-1> can be obtained with the Nd_<0.9> (Fe_<0.98>V_<0.02>) _<11>Mo_<0.9>N_X ribbon annealed at 900゚C for 30min and nitrided at 550゚C for 4h. It can be concluded that Sm-Fe-C-N and Nd_<1-delta> (Fe, Mo) _<12>N_X melt-spun ribbons show a relatively high magnetic properties. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Satoshi, Sugimoto: "Magnetic Properties of Sm-Fe-(C, N) Melt-Spum Ribbons with Low Sm Content" Materials Transactions, JIM. 35. 917-922 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Satoshi, Sugimoto: "Magnetic Properties of Nd_<1-δ>(Fe, Mo)_<12>N_x Melt-Spun Ribbons with Low Sm Content" Materials Transactions, JIM. 35. 640-644 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Satoshi Sugimoto: "Magnetic Properties of Sm-Fe-(C.N) Melt-Spun Ribbons with Low Sm Content" Materials Transactions. JIM,35. 917-922 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Satoshi Sugimoto: "Magnetic Properties of Nd_<1-delta> (Fe, Mo) _<12>N_X Melt-Spun Ribbons with Low Sm Content" Materials Transactions. JIM,35. 640-644 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Satoshi Sugimoto: "Magnetic Properties of Sm-Fe-(C, N) Melt-Spun Ribbons with Low Sm Content" Materials Transactions, JIM. 35. 917-922 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Satoshi Sugimoto: "Magnetic Properties of Nd_<1-δ>(Fe, Mo)_<12>N_x Melt-Spun Ribbons with Low Sm Content" Materials Transactions, JIM. 35. 640-644 (1994)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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