Pr基合金晶界扩散对烧结钕铁硼性能和结构的影响  

Effect of grain boundarydiffusion of Pr-based alloyon the properties and structure of sintered NdFeB

作　　者：徐俊 查善顺 雷燕 何凡 刘友好 陈静武 XU Jun;ZHA Shanshun;LEI Yan;HE Fan;LIU Youhao;CHEN Jingwu(Earth-Panda Advanced Magnetic Materials Co.,Ltd.,State Key Laboratory of Rare Earth Permanent Magnetic Materials,Hefei 231500,Anhui,China)

机构地区：[1]安徽大地熊新材料股份有限公司,稀土永磁材料国家重点实验室,安徽合肥231500

出　　处：《金属功能材料》2024年第6期84-90,共7页Metallic Functional Materials

基　　金：国家重点研发计划(2021YFB3502802)。

摘　　要：通过丝网印刷涂敷技术,在烧结钕铁硼磁体表面分别涂敷了Pr、Pr_(96)Al_(4)、Pr_(83)Cu_(17)、Pr_(80)Co_(20)涂层,并对其进行晶界扩散热处理。对比分析了扩散后磁体的磁性能、温度稳定性、相结构和微观结构。结果表明:扩散磁体的内禀矫顽力提高4kOe以上,增幅超35%,剩磁降低0.3kGs以内,降幅小于3%;扩散磁体的高温矫顽力明显提升,高温剩磁、剩磁温度系数和矫顽力温度系数基本不变,扩散Pr_(80)Co_(20)磁体的居里温度提升了7.3℃;扩散源沿晶界扩散进入磁体内部,使得晶界富稀土相明显增多,有效地隔离了主相晶粒。Pr,Pr_(96)Al_(4),Pr_(83)Cu_(17)and Pr_(80)Co_(20)coatings were applied to the surface of sintered NdFeB magnets by screen printing technology,and the grain boundary diffusion heat treatment was carried out.The magnetic properties,temperature stability,phase structure and microstructure of the diffused magnets were compared and analyzed.The results show that the intrinsic coercivity of the diffused magnets was increased by more than 4kOe,an increase of more than 35%,and the remanence was reduced by less than 0.3kGs,a decrease of less than 3%.The hightemperature coercivity of the diffused magnets were significantly improved,the high-temperature remanence,remanence temperature coefficient and coercivity temperature coefficient were basically unchanged,and the Curie temperature of the Pr_(80)Co_(20)diffused magnet was increased by 7.3℃.The diffusion source diffuses into the magnet along the grain boundary,which significantly increases the number of RE-rich phase in the grain boundary,effectively isolating the main phase grains.

关 键 词：钕铁硼 Pr基合金 晶界扩散 矫顽力 微观结构 温度稳定性 

分 类 号：TM2[一般工业技术—材料科学与工程]