• Title/Summary/Keyword: new axial pressing method

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Axial Pressing Method Using Pulse Magnetizing Field for the Preparation of Nd-Ee-B Sintered Magnets (펄스자장을 이용한 고이방화 Nd-Fe-B자석의 종축자장성형방법)

  • Kim, Dong-Hwan;Kang, Byung-Kil;Jang, Dong-Youl;Kim, Andrew S.;Kim, Sang-Myun;Jang, T.S.
    • Journal of the Korean Magnetics Society
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    • v.13 no.4
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    • pp.182-186
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    • 2003
  • A new axial pressing method using pulse magnetizing field was studied to improve the remanence of Nd-Fe-B sintered magnets. In order to make near-net shape green compacts of butterfly, disk, or coin magnets, conventional axial-type pressing has been normally used. However, compared to the transverse-type pressing, it is not possible to obtain higher remanence by this method because the magnetic alignment of powder begins to deteriorate when the density of green compacts increases over a critical value. On the other hand, we found that an axial pressing under pulse magnetizing field was very effective to increase the degree of magnetic alignment of powder, yielding remanences even higher than those obtained by the transverse pressing. In this study, it was revealed that appropriate tapping density and how to apply pulse magnetic held were important to improve the grain alignment and thus remanence of Nd-Fe-B sintered magnet.