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Studies on Processing and Characteristics of Iron Carbides

Research Project

Project/Area Number 01470071
Research Category

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

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionNagoya University

Principal Investigator

HIRANO Shin-ichi  Nagoya Univ., School of Engineering, Professor, 工学部, 教授 (30016828)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1990: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1989: ¥5,400,000 (Direct Cost: ¥5,400,000)
KeywordsIron Carbides / Magnetic Properties / Fe_3C / Thin Film / Sputtering / Carburization / 高飽和磁化値 / 保磁力
Research Abstract

In this research, the processing and the characteristics of iron carbides particles and films were investigated in detail in order to elucidate the basic properties for their application to a magnetic recording material.
CO gas diluted with N_2 was found to be a very effective reactive gas for carburization of iron oxides or alpha-Fe to produce the well-defined iron carbides. Fe_5C_2 formed as a major phase at temperatures from 300 to 400^゚C. Fe_3C could be synthesized above 400^゚C as a single phase. The addition of alkali or alkaline earth to iron oxide particles was found to be a key to synthesize Fe_7C_3 particles.
The improvement of the coercivity and the squareness of the magnetic characteristics could be achieved by the processing of acicular Fe_3C particles, which were synthesized from acicular alpha-Fe particles with CO gas. Their saturation magnetization, the coercivity and the squareness were 100 emu/g, 700 Oe and 0.4, respectively.
Fe_3C thin films could successfully be synthesized by the controlled RF-magnetron sputtering with a composite target of Fe/C. The optimum condition to synthesize the single phase Fe_3C films found to be as follows ; temperature, 350^゚C, Ar pressure, 5 Pa.
The saturation magnetization and the coercivity of the Fe_3C films were from 100 to 120 emu/g and 250 Oe, respectively, The films exhibits a longitudinal magnetization direction.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] S.HiRANO: "Symthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon monooxide" Journal of Materials Science. 25. 4457-4461 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 平野 眞一: "炭化鉄(Fe_3C)の合成と磁気的特性" 粉体および粉末冶金協会誌. 37. 421-425 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S.Tajima: "Synthesis and Magnetic Properties of Fe_7C_3 particles with High saturation magnetijation" Japanese Journal of Applied Physics. 29. 662-668 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 田島 伸: "各種出発鉄原料と一酸化炭素からのの針状炭化鉄の生成挙動およびその磁気的特性" 粉体および粉末冶金協会誌. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Hirano and S. Tajima,: "Synthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon monoxide" J. Mater. Sci.25-10,. 4457-4461, (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Hirano and S. Tajima,: "Synthesis and magnetic properties of iron carbide (Fe_3C)" J. Jpn. Soc. Powder & Powder Metall.37-3. 421-425 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Tajima and S. Hirano,: "Synthesis and magnetic properties of Fe_7C_3 particles with high saturation magnetization" Jpn. J. Appl. Phys.,. 29-4. 662-668, (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Tajima and S. Hirano,: "Formation behavior and magnetic properties of acicular iron carbides particles by reaction of various kinds of starting iron sources and carbon monoxide" J. Jpn. Powder & Powder Metall.,.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S.HIRANO: "Synthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon mono oxide" Journal of Materials Science. 25. 4457-4461 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 平野 眞一: "炭化鉄(Fe_3C)の合成と磁気的特性" 粉体および粉末冶金協会誌. 37. 421-425 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Tajima: "Synthesis and Magnetic Properties of Fe_7C_3 particles with High saturation magnetization" Japanese Journal of Applied Physics. 29. 662-668 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 田島 伸: "各種出発鉄原料と一酸化炭素からの針状炭化鉄の生成挙動およびその磁気的特性" 粉体および粉末冶金協会誌. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 平野眞一: "炭化鉄(Fe_3C)の合成と磁気的特性" 粉体および粉末冶金. 37. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Shin-ichi Hirano: "Synthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon monoxide" J.Mater.Sci.

    • Related Report
      1989 Annual Research Report
  • [Publications] Shin Tajima: "Synthesis and magnetic properties of Fe_7C_3 Particles with high saturation magnetization" Jpn.J.Appl.Phys.

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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