Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method
Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method
复制标题
DOI：
10.1088/1674-1056/26/5/057502
复制
发表时间：
2017-05
影响因子：
1.7
通讯作者：
R. Shang;J. Xiong;Dan Liu;S. Zuo;Xin Zhao;Rui-wei Li;W. Zuo;T. Zhao;Ren-jie Chen;Jirong Sun;B. Shen
中科院分区：
文献类型：
--
作者：
R. Shang;J. Xiong;Dan Liu;S. Zuo;Xin Zhao;Rui-wei Li;W. Zuo;T. Zhao;Ren-jie Chen;Jirong Sun;B. Shen
采用双合金法（MM，混合稀土）制备了MM14Fe79.9B6.1/Nd13.5Fe80.5B6永磁体。有些磁铁有两个居里温度。居里温度T-c1对应于含有更多LaCe的主相，并且随着MM含量从30.3at.%增加，Tc 1从276.5 ℃降低到256.6 ℃至50.6at.%。Br随MM的增加而变化，表明磁体中存在晶间交换耦合。当MM/R = 7.11 kOe，最大能积（BH）（max）>= 41 MGOe时。与Nd相比，La和Ce在烧结过程中更容易向晶界扩散，导致H-cj降低。由于晶粒间的扩散，La、Ce、Pr和Nd在每个晶粒中的原子比不同，并且Nd在所有晶粒中的百分比高于混合稀土中的百分比。
MM14Fe79.9B6.1/Nd13.5Fe80.5B6 magnets were fabricated by dual alloy method (MM, misch metal). Some magnets have two Curie temperatures. Curie temperatures T-c1 corresponds to the main phase which contains more LaCe, and Tc1 decreases from 276.5 degrees C to 256.6 degrees C with the content of MM increasing from 30.3 at.% to 50.6 at.%. The variation of Br with the increase ofMMindicates the existence of inter-grain exchange coupling in the magnets. When MM/R = 7.11 kOe and the maximum energy product (BH)(max) >= 41 MGOe. Compared with Nd, La and Ce are easier to diffuse to the grain boundaries in the sintering process, and this will cause the decrease of H-cj. Due to the diffusion between the grains, the atomic ratio of La, Ce, Pr, and Nd in each grain is different and the percentage of Nd in all grains is higher than that in misch metal.