Magnetic Properties of TbCu_7-type Sm-Fe-Co-Ti-N Compounds

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Experiments were carried out to investigate the effect of composition, heat-treatment and nitrogenation conditions on the magnetic properties of Sm-Fe-Co-Ti-N compounds with TbCu<SUB>7</SUB>-type structure. The optimum preparation conditions of the compounds were as follows: composition: {Sm<SUB>10</SUB>(Fe<SUB>0.95</SUB>CO<SUB>0.05</SUB>)<SUB>89.7</SUB>Ti<SUB>0.3</SUB>}<SUB>82.0</SUB>N<SUB>18.0</SUB>, roller velocity: 50 m/s, heat treatment: 680°C for 60min in high-purity Ar gas, and nitrogenation condition: 420°C for 15h in high-purity N2 gas. Typical magnetic properties of the obtained compound powders were as follows: Jr=0.99 T, Hcj=736.5 kA/m, HcB=540.4 kA/m, (BH)max=140.9 kJ/m<SUP>3</SUP> (17.7 MGOe), and Tc=488°C. It was found that this sample was an exchange spring magnet from recoil loops of the hysteresis curve, TEM photographs and X-ray analysis. The value of (BH)max for the compression-molding isotropic bonded magnet prepared by using from {Sm<SUB>10</SUB>(Fe<SUB>0.95</SUB>Co<SUB>0.05</SUB>)<SUB>89.7</SUB>Ti<SUB>0.3</SUB>}<SUB>82.0</SUB>N<SUB>18.0</SUB> powder was 103.2 kJ/m<SUP>3</SUP> (13.0 MGOe), when the density of bonded magnet was 6.04 Mg/m<SUP>3</SUP>. And the average reversible temperature coefficient of Jr was a(Jr)ave.=-0.04%/°C, the temperature coefficient of Hcj in the range from 25°C to 125°C obtained by a linear extrapolation was a (HcJ) =-0.44 %/°C.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 50(11), 865-869, 2003-11-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10012549344
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    6786952
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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