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矿冶:2023,32(4):-
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纳米Al掺杂对烧结Nd-Fe-B结构与性能的影响
(矿冶科技集团有限公司, 北矿磁材(阜阳)有限公司)
Effect of Al nanoparticles doping on the structure and properties ofsintered Nd-Fe-B
CAO Yujie1, ZHANG Pengjie1, SUN Wei1,2
(1.BGRIMM Technology Group;2.BGRIMM Magnetic Materials and Technology Fuyang Co Ltd)
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投稿时间:2023-03-24    修订日期:2023-04-06
中文摘要: 采用晶间掺杂方法将不同含量的纳米Al加入钕铁硼细粉中,制备出不同纳米Al掺杂量的烧结钕铁硼磁体。系统研究了纳米Al的掺杂对烧结钕铁硼磁体微观结构、磁性能和温度稳定性的影响。结果表明:纳米Al的掺杂可以明显提高磁体的矫顽力,其矫顽力由未掺杂纳米Al时的8.91 kOe提高到掺杂0.8 wt%纳米Al时的12.34 kOe,但纳米Al的掺杂也会导致磁体的剩磁和磁能积的降低。纳米Al的掺杂能够改善磁体的温度稳定性。由于纳米Al的熔点低,通过掺杂纳米Al既有助于烧结磁体的液相烧结促进其致密化,又能减少块状富稀土相,增加薄片状富稀土相,起到去磁耦合作用,对于烧结磁体的磁硬化具有重要作用。
Abstract:Sintered NdFeB magnets with different nano Al doping content were prepared by adding different nano Al into NdFeB fine powder by intergranular doping method. The effects of nano Al doping on the microstructure, magnetic properties and temperature stability of sintered NdFeB magnets were systematically studied. Results show that the coercivity of the magnets can be significantly improved by doping nano Al. The coercivity increases from 8.91 kOe when undoped nano Al to 12.34 kOe when doped with 0.8 wt% nano Al. However, the doping of nano Al will also reduce the remanence and magnetic energy product of the magnets. The doping of nano Al can improve the temperature stability of the magnets. Due to the low melting point of nano Al, doping nano Al can not only help the liquid phase sintering of sintered magnets and promote its densification, but also reduce the massive rare earth rich phases and increase the lamellar rare earth rich phases, which plays a demagnetizing coupling role and an important role in the magnetic hardening of sintered magnets.
文章编号:20230324002     中图分类号:    文献标志码:
基金项目:国家重点研发计划“稀土新材料”重点专项2021年度青年科学家项目(2021YFB3502400);安徽省重点研究与开发计划项目(006123115012);安徽省博士后研究人员科研活动经费资助项目(2022B637)。
引用文本:
曹玉杰,张鹏杰,孙威.纳米Al掺杂对烧结Nd-Fe-B结构与性能的影响[J].矿冶,2023,32(4):.

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