摘要
采用轻稀土替代部分重稀土做为烧结钕铁硼磁体的扩散源,可以提高矫顽力、降低成本。实验选用低成本轻稀土Pr部分替代Tb-Al-Ga合金中的重稀土Tb,对比研究Pr替代量对双主相烧结Nd-Ce-Fe-B磁体和单主相烧结Nd-Fe-B磁体磁性能和显微结构的影响,揭示其矫顽力强化机制。以Pr_(60)Tb_(20)Al_(10)Ga_(10)为扩散源,晶界扩散磁体的矫顽力有明显提升;与单主相磁体相比,双主相磁体扩散深度有明显提升。低熔点的Pr优先进入磁体内部,改善了晶界相的润湿性,有利于加速Tb元素扩散进入磁体内部,在主相晶粒外侧形成具有高磁晶各向异性场的壳层结构,进而提高磁体矫顽力。
The coercivity of sintered Nd-Fe-B magnets can be improved and the cost can be reduced when light rare earth is used as the diffusion source to replace part of heavy rare earth.In this paper,the heavy rare earth Tb in Tb-Al-Ga alloy was partially replaced by low-cost light rare earth Pr.The effects of Pr substitution on the magnetic properties and microstructure of sintered dual-main-phase Nd-Ce-Fe-B magnets and sintered singlemain-phase Nd-Fe-B magnets were studied,and the coercivity strengthening mechanism was revealed.With Pr_(60)Tb_(20)Al_(10)Ga_(10) as the diffusion source,the coercivity of the grain boundary diffusion magnet increases obviously.Compared with the single main phase magnet,the diffusion depth of the double main phase magnet is significantly increased.Pr with low melting point preferentially enters the magnet and improves the wettability of grain boundary phase.This causes more Tb elements to enter more deeply in magnet,forming a shell structure with high magneto-crystalline anisotropy field surrounding main phase grain,and then improving the coercivity of GBDed magnet.
作者
胡镌芮
赵航
宋瑞芳
冯海波
HU Juanrui;ZHAO Hang;SONG Ruifang;FENG Haibo(Beijing Aerospace Control Instrument Research Institute,Beijing 100048;Division of Functional Materials,Central Iron&Steel Research Institute,Beijing 100081)
出处
《粉末冶金工业》
北大核心
2024年第5期32-38,48,共8页
Powder Metallurgy Industry
基金
国家重点研发计划资助项目(2022YFB3503303)
