Sensitivity of coercivity and squareness factor of a Nd-Fe-B sintered magnet on post-sintering annealing temperature
来源期刊：Journal of Rare Earths2015年第5期
论文作者：梁乐 武梦艳 刘丽华 马冲 王静 张江东 张澜庭
文章页码：507 - 513
摘 要：An N38SH-grade magnet with low oxygen content was used to study the evolution of magnetic properties upon post-sintering annealing. Phase transformation of as-sintered magnet was investigated by differential scanning calorimetry（DSC）. Three low temperature eutectic transition points were detected. Little change could be found when annealed below the lowest eutectic transition point. A wide annealing temperature range（460–560 oC） between the lowest and highest eutectic transition point was available for this magnet to achieve a relatively high coercivity（1671 k A/m） at a relatively low Dy content（3 wt.%）. However, squareness factor（SF） of the demagnetizing curve and its temperature stability were found to decrease after annealing above the highest eutectic transition point. This was attributed to the change of Cu content in the Nd-rich phase under different annealing temperatures.
梁乐1，武梦艳1，刘丽华1，马冲1，王静1，张江东2，张澜庭1
1. School of Materials Science and Engineering, Shanghai Jiao Tong University2. Shanghai Roco Magnetics Co., Ltd.
摘 要：An N38SH-grade magnet with low oxygen content was used to study the evolution of magnetic properties upon post-sintering annealing. Phase transformation of as-sintered magnet was investigated by differential scanning calorimetry（DSC）. Three low temperature eutectic transition points were detected. Little change could be found when annealed below the lowest eutectic transition point. A wide annealing temperature range（460–560 oC） between the lowest and highest eutectic transition point was available for this magnet to achieve a relatively high coercivity（1671 k A/m） at a relatively low Dy content（3 wt.%）. However, squareness factor（SF） of the demagnetizing curve and its temperature stability were found to decrease after annealing above the highest eutectic transition point. This was attributed to the change of Cu content in the Nd-rich phase under different annealing temperatures.
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