Effect of discrete distribution of powder size on magnetic properties of NdFeB
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摘要: 制备了一种NdFeB永磁材料，探讨了制粉前处理方式对粉末离散性、粒径及成品NdFeB永磁体结构与性能的影响。原材料经熔炼、粗破碎后，采用高速风选和高压氢爆2种制粉前处理方式，然后采用同样的成型、烧结和回火工艺制备得到(PrNd)32.3Nb0.70Al0.60Cu0.20B1.03Fe65.17合金，并系统研究了该合金的显微结构和磁性能。结果表明:高压氢爆处理后得到的粉末粒度呈单分散性，粉末粒径较细，所制备得到的磁体样品的微观结构均匀性也较好;高压氢爆处理后制得的磁体样品剩余磁通密度比高速风选制粉方式得到的磁体样品高0.047 T，内禀矫顽力高 193.4 kAm－1，最大磁能积高24.6 kJm－３。Abstract: (PrNd)32.3Nb0.70Al0.60Cu0.20B1.03Fe65.17 (weight percent) alloys were prepared via different powdering processes, i.e. air classification(AC) and hydrogenation decomposition(HD). Their microstrutures and magnetic properties were investigated. The results show that, HD produces monodispersed fine powders, with which the magnets prepared have uniform microstructure. Moreover, the maximum magnetic energy product, remanence and intrinsic coercivity of the magnets prepared with HD-produced powders are 24.6 kJm-3, 0.047 T and 193.4 kAm-1 higher than those of the magnets prepared with AC-produced powders, and thus the former magnets are better applicable to devices like laser head and magnetron.
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