Investigation of Abnormal Grain Growth in Sintered Nd-Fe-B Permanent Magnet

【Author】

Liu Guozheng,Liu Shufeng,Wu Bin,Lu Weidong,Zhao Mingjing, Lu Fuqiang, Zhao Ruijin (Baotou Research Institute of Rare Earth, Baotou 014010, China;Inner Mongolia Xi Yuan Engineering and Technology Research Center of Rare Earth Fuctional Material, Baotou 014010, China)

【Abstract】

<正> The abnormal growth of grains of sintering Nd13.6Dy0.4Fe79.5B6.5 magnets were investigated in low oxygen manufacturing process. The abnormal growth of grains occurs easily when the sintering temperature is higher than 1080 ℃during the manufacture process. In the magnets, the oxygen content is less than 700×10-6 and the average particle size of powder is smaller than 4 μm. The squareness of demagnetization curve of magnet is deteriorated. For high performance magnets, the abnormal growth grain should be avoided by selecting a suitable sintering temperature.

【Keywords】

condensed state physis; Nd-Fe-B magnets; M-H loop squareness; abnormal grains growth; microstruc-ture; rare earths

References

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Springer Journals Database

Total: 4 articles

  • [1] Ding Kaihong; Liu Guozheng; Yan Jianming, etal, High energy and high coercivily sintered NdFeB magnet with low oxygen Process, J. Mater. Sci. Techn ol,
  • [2] Wang Zhanyong;Gu Nanju;Wang Baoqi, The factors affecting the M-H loop squareness of sintered Nd-Fe-B magnets, J. Magnetic Materials and Devices,
  • [3] Sasaki S; Fidler J;Sagawa M, High performance sintered Nd-Fe-B magnets made by RIP from SC, Proceedings of the Sixteenth International Workshop on Rare-Earth Magnets and Their Applications,
  • [4] Rodewald W; Wall B; Fernengel W, Grain growth kinetics in sintered Nd-Fe-Bmagnets, IEEE Trans. Magn, IEEE Transactions on Magnetics (IEEE Transactions on Magnetics)

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