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Effect of Homogenization Treatment on Magnetic Properties of HDDR Treated Nd-Fe-Ga-Nb-B Alloy

모합금의 균질화처리가 HDDR 처리된 Nd-Fe-Ga-Nb-B 합금의 자기적 특성에 미치는 영향

  • 유지훈 (한국기계연구원 부설 재료연구소) ;
  • 이상협 (한국기계연구원 부설 재료연구소) ;
  • 김동환 (한국기계연구원 부설 재료연구소) ;
  • 이동원 (한국기계연구원 부설 재료연구소) ;
  • 김병기 (한국기계연구원 부설 재료연구소) ;
  • 최문희 (부산대학교 재료공학과) ;
  • 김양도 (부산대학교 재료공학과)
  • Published : 2009.08.28

Abstract

HDDR treated anisotropic Nd-Fe-B powders have been widely used, due to their excellent magnetic properties, especially for sheet motors and sunroof motors of hybrid and electric vehicles. Final microstructure and coercivity of such Nd-Fe-B powders depend on the state of starting mother alloys, so additional homogenization treatment is required for improving magnetic properties of them. In this study, a homogenization treatment was performed at $900\sim1140^{\circ}C$ in order to control the grain size and Nd-rich phase distribution, and at the same time to improve coercivity of the HDDR treated magnetic powders. FE-SEM was used for observing grain size of the HDDR treated powder and EPMA was employed to observe distribution of Nd-rich phase. Magnetic properties were analyzed with a vibrating sample magnetometer.

Keywords

References

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