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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Hard Magnetic Materials

J. Appl. Phys. 111, 07A705 (2012); http://dx.doi.org/10.1063/1.3671426 (3 pages)

Magnetic properties and microstructure of Nd-Fe-B sintered magnets with DyHx addition

Y. H. Liu1,2, S. Guo1,2, X. M. Liu1,2, D. Lee1,2, and A. R. Yan1,2

1Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People’s Republic of China
2Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People’s Republic of China

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(Received 23 September 2011; accepted 18 October 2011; published online 13 February 2012)

The effects of DyHx addition on magnetic properties and microstructure of Nd-Fe-B sintered magnets were investigated. In order to obtain the best magnetic properties, the effects of sintering temperature and annealing time on magnetic properties were also investigated. The results shown that the addition of DyHx can affect the microstructure, increase the intrinsic coercivity (Hcj), and improve the thermal stability of sintered Nd-Fe-B magnets. The remanence (Br) and Hcj showed different variation trends as sintering temperature changes. Within a reasonable range, sintering at higher temperature can get higher Br but lower Hcj. The Hcj was further increased by heat treatment and annealing time was extended.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
  3. RESULTS AND DISCUSSION
  4. CONCLUSION

KEYWORDS, PACS, and IPC

Keywords

boron alloys, coercive force, crystal microstructure, dysprosium compounds, heat treatment, iron alloys, magnetic annealing, magnets, neodymium alloys, remanence, sintering, thermal stability

PACS

  • 75.60.Nt

    Magnetic annealing and temperature-hysteresis effects

  • 81.20.Ev

    Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

  • 61.72.-y

    Defects and impurities in crystals; microstructure

  • 75.50.Vv

    High coercivity materials

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

International Patent Classification (IPC)

  • C22C38/00

    Ferrous alloys, e.g. steel alloys

  • C22F1/00

    Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working

  • C21D1/00

    General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering

  • C21D1/04

    With simultaneous application of supersonic waves, magnetic or electric fields

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

  • H01F7/00

    Magnets

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671426

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    H. Sepehri-Amin, T. Ohkubo, and K. Hono, J. Appl. Phys. 107, 09A745 (2010)JAPIAU00010700000909A745000001.

    S. Hirosawa, Y. Matsuura, H. Yamamoto, S. Fujimura, M. Sagawa, and H. Yamauchi, J. Appl. Phys. 59, 873 (1986)JAPIAU000059000003000873000001.


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