摘要
通过粉末冶金法制备了不同z值(z=7.5~8.5)的Sm(CoFeCuZr)z磁体。利用磁性能测量系统、X射线衍射分析、电子探针以及透射显微镜等对磁体的性能、组成相、析出相含量、微观结构及元素分布进行表征,通过分析解释了磁性能随z值变化的内在机理。结果表明:随z值增大,胞状结构尺寸增大,高饱和磁化强度的2:17R相增多导致剩磁Br升高;z值增大导致富Zr析出相增多,引起方形度Hk/Hcj下降;z值通过改变Cu元素在2:17R相界面位置的富集程度来改变矫顽力Hcj的大小,在一定范围内(z<8.2)该位置Cu含量越高,矫顽力越大。
The Sm(CoFeCuZr)z permanent magnets with different z values (z=7.5-8.5) were prepared by powder metallurgy.The properties,constituent phase,precipitated-phase content,microstructure and element distribution of the magnet were characterized by magnetic measurement system,X-ray diffraction analysis,electron probe and transmission electron microscope.Magnetic properties changed with z value,and the inherent mechanism was explained.The results show that with the increase of z value the size of cell structure increases and the 2:17R phase with high saturation magnetization also increases in amount,which finally results in the improvement of remanence Br.The precipitated Zr-riched phase increases when the z value increases,which has a weakening effect on the squareness Hk/Hcj.The z value changes the enrichment of Cu element at the edge of 2:17R phase,and thus influences the coercivity Hcj.Within the certain range (z <8.2),the higher the content of Cu at that edge,the larger the coercivity.
作者
张天丽
王文龙
徐成
王慧
张伟
张志宏
蒋成保
Zhang Tianli;Wang Wenlong;Xu Cheng;Wang Hui;Zhang Wei;Zhang Zhihong;Jiang Chengbao(Beihang University,Beijing 100191,China;State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第5期1567-1572,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51471016)
北京市自然科学基金(2151002)
