雷燕,丁文强,查善顺,刘友好

• 1:安徽大地熊新材料股份有限公司
• 2:稀土永磁材料国家重点实验室

摘要(Abstract)：

采用粉末冶金工艺制备了不同Co含量和Co分布的烧结钕铁硼磁体,通过微观结构观察和元素分布分析研究了Co含量及分布对磁体磁性能、剩磁温度系数和居里温度的影响。结果表明:当主相晶粒中Co含量由0增加到10 mass%时,磁体的剩磁、矫顽力基本保持不变,在20～80℃范围内的剩磁温度系数从-0.113%/℃改善到-0.080%/℃;采用双合金工艺制备磁体的主相中Co含量为4 mass%时,居里温度由不含Co磁体的309.1℃提高至361.4℃;此外,分别添加Nd_(80)Co_(20)和Nd-Fe-Co-B、NdHx制备了Co含量为4 mass%的磁体,在烧结过程中由于Co元素向主相或晶界相中扩散,导致两种磁体主相中Co元素的分布情况基本相同,因此剩磁温度稳定性和居里温度相差不大;在添加Nd_(80)Co_(20)制备的磁体晶界中还观察到了浅灰色稀土铁相,该相促进了非铁磁性薄层晶界相的形成,使磁体矫顽力提高到20.25 k Oe。

关键词(KeyWords)： Co含量;Co分布;烧结钕铁硼;温度系数;居里温度

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2021YFB3502803)

作者(Author): 雷燕,丁文强,查善顺,刘友好

DOI: 10.13289/j.issn.1009-6264.2024-0475

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