Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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

  1. L. Yang: Proceeding of the 19th International Workshop on HPMA and their Application, (2006) 1
  2. Y. Honkura: Proceeding of the 18th International Workshop on HPMA and their Application, (2004) 559
  3. Y. Honkura: Proceeding of the 19th International Workshop on HPMA and their Application, (2006) 231
  4. I. R. Harris and P. J. McGuiness: J. of the Less-Common Metals, 172 (1991) 1273 https://doi.org/10.1016/S0022-5088(06)80037-8
  5. O. Gutfleisch, M. Verdier and I. R. Harris: J of Alloys and Compounds, 196 (1993) L19 https://doi.org/10.1016/0925-8388(93)90560-A
  6. T. Momida, P. Choi, Y. Maehara, M. Uehara, H. Tomizawa and S. Hirosawa: J. of Alloys and Compounds, 242 (1996) 129 https://doi.org/10.1016/0925-8388(96)02378-X
  7. Y. Kawashita, N. Waki, T. Tayu, T. Sugiyama, H. Ono, H. Koyama, H. Kanno and T. Uchida: J. of Magnetism and Magnetic Materials, 269 (2004) 293 https://doi.org/10.1016/S0304-8853(03)00595-X
  8. S. Sugimoto, H. Nakamura, K. Kato, D. Book, T. Kagotani, M. Okada and M. Homma: Journal of Alloys and Compounds, 293 (1999) 862 https://doi.org/10.1016/S0925-8388(99)00376-X
  9. M. Sagawa, S. Fujimura, N. Tpgawa and Y. Matsuura: J. Appl. Phys., 55 (1984) 2083 https://doi.org/10.1063/1.333572
  10. P. Thompson, O. Gutfeisch, J. N. Chapman and I. R. Harris: J. of Magnetism and Magnetic Materials, 202 (1999) 53 https://doi.org/10.1016/S0304-8853(99)00325-X