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

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