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

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概要

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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.

• 社団法人 粉体粉末冶金協会の論文
• 2003-11-15

著者

• Yamamoto Hiroshi

  School of Pharmacy, Shujitsu University

• Yamamoto H

  Shimamura Tech. Co. Ltd. Tokyo Jpn

• MORI Taichi

  School of Science and Technology, Meiji University

• Mori Taichi

  School Of Science And Technology Meiji University

• Yamamoto Hiroshi

  School Of Engineering Nagoya University

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