热压热变形NdFeB的各向异性及磁性能研究  

Anisotropy and magnetic properties of hot-pressed and hot-deformed NdFeB

作　　者：任梦 石晓宁 韦智元 周磊[2] 李军[2] 李波 REN Meng;SHI Xiaoning;WEI Zhiyuan;ZHOU Lei;LI Jun(Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Functional Materials Division of Advanced Technology and Materials Co.,Ltd.,Beijing 101318,China China Iron and Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司,北京100081 [2]安泰科技股份有限公司功能材料事业部,北京101318 [3]中国钢研科技集团有限公司,北京100081

出　　处：《金属功能材料》2022年第4期43-51,共9页Metallic Functional Materials

基　　金：国家重点研发计划“稀土新材料”:智能终端用特种铈磁体及服役特性(2021YFB3503004)。

摘　　要：具有纳米级微结构组织的热压热变形NdFeB,易成型、工艺流程短且环境稳定性高。但其矫顽力仍未达到理论值73 kOe,这与微结构不均匀,矫顽力增强路径未确定有关。研究热压热变形钕铁硼的矫顽力机制和各向异性形成机制,有助于加深对磁体微观结构的认识,进一步提高磁性能。近年来的研究发现,双相纳米复合磁体或者添加石墨烯,可有效优化热压热变形NdFeB的微观结构,提升矫顽力。这为改进热压热变形技术提供了新的思路和借鉴。Hot-pressed and hot-deformed NdFeB with nanoscale microstructure is easy to form,with short technological process and high environmental stability.However,its coercivity didn′t achieve the theoretial value 73 kOe,which is related to the uneven microstructure and unclear coercivity mechanism.The study of coercivity mechanism and anisotropy formation mechanism of hot-pressed and hot-deformed NdFeB is helpful to deepen the understanding of the microstructure of magnets and further improve the magnetic properties.Recent studies have found that dual-phase nanocomposite magnets or graphene addition can effectively optimize microstructure of hot-pressed and hot-deformed NdFeB,and enhance coercivity at the same time.This provides new ideas and references for the development of hot pressing and hot deformation technology.

关 键 词：热压热变形NdFeB 矫顽力机制 各向异性形成机制 双相纳米复合磁体 石墨烯添加剂 

分 类 号：TM273[一般工业技术—材料科学与工程]