Magnetic Properties of TbCu7-type Sm-Fe-Co-Ti-N Compounds

• Yamamoto Hiroshi

  School of Science and Technology, Meiji University

• Mori Taichi

  School of Science and Technology, Meiji University

Abstract

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 TbCu₇-type structure. The optimum preparation conditions of the compounds were as follows: composition: {Sm₁₀(Fe_0.95CO_0.05)_89.7Ti_0.3}_82.0N_18.0, 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/m³ (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 {Sm₁₀(Fe_0.95Co_0.05)_89.7Ti_0.3}_82.0N_18.0 powder was 103.2 kJ/m³ (13.0 MGOe), when the density of bonded magnet was 6.04 Mg/m³. 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.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 50 (11), 865-869, 2003

  Japan Society of Powder and Powder Metallurgy

Keywords

• Sm-Fe-Co-Ti-N compounds
• TbCu<SUB>7</SUB>-type structure
• single roller rapid-quenching
• nitrogenation
• magnetic properties
• exchange spring magnet

Details

• CRID: 1390001206307579648
• NII Article ID: 10012549344
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.50.865
• COI: 1:CAS:528:DC%2BD3sXpslyqsb8%3D
• ISSN: 18809014
• ISSN: 05328799
• ISSN: http://id.crossref.org/issn/05328799
• NDL BIB ID: 6786952
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6786952
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed