[1]饶晓雷 钮萼 胡伯平.Ce对烧结钕铁硼磁体永磁性的影响[J].中国材料进展,2017,(1):036-40.[doi:10.7502/j.issn.1674-3962.2017.01.09]
 RAO Xiaolei,NIU E,HU Boping.Effects of Cerium on Permanent Magnetic Properties of Sintered Nd-Fe-B Magnets[J].MATERIALS CHINA,2017,(1):036-40.[doi:10.7502/j.issn.1674-3962.2017.01.09]
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Ce对烧结钕铁硼磁体永磁性的影响()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2017年第1期
页码:
036-40
栏目:
前沿综述
出版日期:
2017-01-31

文章信息/Info

Title:
Effects of Cerium on Permanent Magnetic Properties of Sintered Nd-Fe-B Magnets
作者:
饶晓雷 钮萼 胡伯平
中科三环研究院
Author(s):
RAO Xiaolei NIU E HU Boping
Zhong Ke San Huan Research
关键词:
Ce混合价CeFe2钕铁硼烧结快淬双合金双主相
Keywords:
Ce mixed valence CeFe2 Nd-Fe-B sinter rapidly quench dual-alloy dual-main-phase
DOI:
10.7502/j.issn.1674-3962.2017.01.09
文献标志码:
A
摘要:
Ce在镧系元素中是具有特殊性质的一员,其根源在于它的混合价特性。在Ce2Fe14B化合物中,Ce表现出强烈的+4价倾向,不仅自身4f电子缺失无法贡献稀土离子磁性,而且离子半径过小导致Fe-Fe间距缩减,使Ce2Fe14B居里温度和饱和磁极化强度都以较大幅度下降。另外,在Ce-Fe-B三元合金中,Ce倾向于生成Laves相CeFe2,而非富稀土低熔点晶界浸润相,不能在烧结磁体中产生使主相晶粒退磁耦合的矫顽力机制,烧结Ce-Fe-B难以实现高矫顽力。尽管如此,Ce2Fe14B仍具有优良的内禀磁性,通过快淬方法可制备出性能适中的(Ce,Nd)-Fe-B各向同性磁粉,而通过贫Ce富Nd和贫Nd富Ce双合金或双主相烧结的方法,用富Nd相承担分割主相晶粒提高矫顽力的功能,也实现了高性价比(Ce,Nd)-Fe-B烧结磁体的商品化。本文针对Ce影响钕铁硼磁体内禀磁性和矫顽力方面的研究工作进行了综合阐述。
Abstract:
Cerium is a very special element in Lanthanide, originating from its mixed valence characteristics. Ce exists in Ce2Fe14B as Ce4+ ion. The lack of 4f electron leads Ce4+ to make no contribution to magnetism. Small ion radius shrinks the Fe-Fe distances and decreases the Curie temperature and saturation polarization of Ce2Fe14B. In addition, it is in favor of CeFe2 Laves phase instead of Ce-rich phase to magnetically decouple Ce2Fe14B grains. Sintered Ce-Fe-B magnet has very poor coercivity. Rapidly quenched isotropic (Ce,Nd)-Fe-B powder can realize reasonable HcJ for certain applications. By dual-alloy or dual-main-phase techniques, using Ce-rich/Nd-lean alloy and Nd-rich/Ce-lean alloy as starting materials, sintered (Ce,Nd)-Fe-B magnet is commercialized with high ratio of performance to cost. The key point is to let Nd-rich phase decouple (Ce,Nd)2Fe14B grains. This article reviews the effects of Cerium on the intrinsic and extrinsic magnetic peroperties of Nd-Fe-B permancent magnets.
更新日期/Last Update: 2016-12-26