【摘要】 选用廉价低纯度钕稀土取代高纯度金属钕,用粉末冶金法制备了Nd-Fe-B永磁体.样品最大磁能积（BH）_max达41MGOe（0.328MT·A/m）.使用X射线衍射仪、差热分析仪、磁天平、提拉样品磁强计和脉冲强磁场等实验方法,对Nd-Fe-B合金进行了分析测量.在1400K附近有相变峰.低温下,Nd-Fe-B合金磁滞回线呈现异常,来源于磁体中Nd₂Fe₁₄B主相锥面型各向异性.更多还原

【Abstract】 By substituting low purity neodymium for the high purity one, NdFeB permanent magnets of (BH)max=41 MGOe were prepared by powder metallurgy. Several properties of NdFeB alloys were measured by means of x-ray diffraction, the differential thermal analyzer, magnetic balance, extracting sample magnetometer and pulse high magnetic field apparatus respectively. The results show that there is a peak of phase transition at 1439K, and the abnormal phenomenon on the magnetic hysteresis loop at low temperature originates from the conical magneto-crystalline anisotropy of the major phase Nd2Fe14 in the NdFeB alloys.更多还原