Influence of Pr-Al-Co alloy diffusion source on magnetic properties and microstructure of sintered Nd-Fe-B magnets processed by grain boundary diffusion  

作　　者：Lei Jin Jinhao Zhu Guangfei Ding Zhehuan Jin Bo Zheng Xuejing Cao Shuai Guo Renjie Chen Aru Yan 

机构地区：[1]Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technologyand Engineering,Chinese Academy of Sciences,Ningbo 315201,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Rare Earths》2022年第12期1885-1893,I0003,共10页稀土学报（英文版）

基　　金：Project supported by Key R&D Program of Zhejiang Province(2021C01190);Major Project of"Science and Technology Innovation 2025"in Ningbo City(2020Z046);Ningbo Natural Science Foundation(202003N4353);Key Research and Development Program of Shandong Province(2019JZZY010321);Inner Mongolia Major Technology Project(2019ZD020);National Natural Science Foundation of China(52101238);Kunpeng Project in Zhejiang Province。

摘　　要：In this study,the influence of the content of Al and Co in the diffusion source on the magnetic performance and microstructure of the diffused magnet was studied by grain boundary diffusion treatment with Pr_(70)Al_(30-x)Co_(x)(x=0 at%,10 at%,15 at%,20 at%,30 at%)alloys.When the Co content in the diffusion source increases from 0 at%to 10 at%,the coercivity enhancement in the Pr_(70)Al_(20)Co_(10)diffused magnet is the highest,increased from 1.62 to 2.24 T,higher than 2.01 T of the Pr_(70)Al_(30)diffused magnet.With further increase of Co content in the diffused source,the coercivity of the diffused magnet decreases gradually,the coercivity of Pr_(70)Al_(15)Co_(15),Pr_(70)Al_(20)Co_(10)and Pr_(70)Co_(30)diffused magnet is 2.15,1.99 and1.81 T,respectively.Microstructural analysis shows that plenty of continuous grain boundary phases(CGBPs)can be formed in the Pr_(70)Al_(20)Co_(10)diffused magnet under the synergistic effect of Al and Co,which leads to the enhancement of magnetic isolation between more adjacent grains.However,the amount of CGBP in the diffused magnets gradually decreases with the further increase of Co content in the diffusion source.

关 键 词：ND-FE-B COERCIVITY Pr-AI-Co alloys Grain boundary diffusion Rare earths 

分 类 号：TG132[一般工业技术—材料科学与工程]