吕锋,黄亮,罗军明,黄有林

• 1:江西金力永磁科技股份有限公司
• 2:南昌航空大学材料科学与工程学院

摘要(Abstract)：

为了有效利用高丰度稀土，在重稀土扩散源Dy_(60)Co_(40)中添加Ce、La以取代Dy。研究了不同的Ce、La添加量对Dy_(60)Co_(40)晶界扩散烧结Nd-Fe-B磁体性能的影响。结果表明：Dy_(30)Ce_(30)Co_(40)、Dy_(30)(Ce_(0.4)La_(0.6))_(30)Co_(40)晶界扩散均能大幅提升Nd-Fe-B磁体的矫顽力，分别为1509和1527 kA/m,相比原始Nd-Fe-B磁体的矫顽力分别提高了31.7%和33.2%,且剩磁和最大磁能积下降不明显。微观组织研究表明，Ce主要分布在晶界相中形成富Ce相，不利于Dy的扩散；而La的添加限制了Ce进入主相晶粒，促进了Dy的扩散，从而进一步提高了磁体的矫顽力。热稳定性研究发现，Ce、La的添加均能提高磁体的热稳定性，但是其提升效果均没有Dy_(60)Co_(40)扩散磁体明显，这与形成了低磁晶各向异性场的Ce_2Fe_(14)B和La_2Fe_(14)B相有关。

关键词(KeyWords)： 钕铁硼磁体;晶界扩散;高丰度稀土;磁性能;热稳定性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51961027);; 江西省重大科技研发专项(20203ABC28W006);; 包头市科技计划项目(XM2021BT03)

作者(Author): 吕锋,黄亮,罗军明,黄有林

DOI: 10.13289/j.issn.1009-6264.2023-0059

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