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本文在研究Nd(Fe,Mo)_(12)N_x的形成条件、结构特点和内禀磁性的基础上,制备了Nd(Fe,Mo)_(12)N_x型永磁体。采用常规球磨的方法,制成各向异性磁粉,矫顽力_iH_c可达501.7 kA/m(6.3 kOe)。研究了矫顽力与微粉颗粒度的关系。发现具有高矫顽力的微粉,对应为小于1μm的单晶颗粒。利用机械合金化工艺制成的磁粉,矫顽力_iH_c可达692.3 kA/m(8.7 kOe),并具有明显的钉扎特征。各向异性磁粉的最大磁能积为95.5 kJ/m~3(12.0 MGOe)。研究了上述两类磁粉矫顽力和剩余磁感应强度随温度的变化,并与Nd_2Fe_(14)B型磁体矫顽力的温度性能进行了对比。
In this paper, Nd (Fe, Mo) _ (12) N_x permanent magnets were prepared based on the formation conditions, structural characteristics and intrinsic magnetic properties of Nd (Fe, Mo) _12N_x. Using conventional ball milling method, the anisotropic magnetic powder is made, and the coercive force _iH_c can reach 501.7 kA / m (6.3 kOe). The relationship between coercivity and particle size was investigated. It is found that the fine powder with high coercivity corresponds to single crystal grains smaller than 1 μm. The magnetic powder prepared by the mechanical alloying process has a coercive force of iH_c of 692.3 kA / m (8.7 kOe) with obvious pinning characteristics. The maximum energy product of anisotropic magnetic particles is 95.5 kJ / m ~ 3 (12.0 MGOe). The coercive force and remanent magnetic induction intensity of these two types of magnetic powders with temperature were studied and compared with the coercivity of Nd 2 Fe 14 B magnets.