热变形纳米晶Nd-Fe-B磁体2和5T时磁化强度与取向度的拟合关系式  

Fitting Formula Between Magnetization and Orientation Degree of Die-Upset Nanocrystalline Nd-Fe-B Magnetizing at 2 and 5 T

作　　者：鲁贻虎[1,2] 王姝隽 刘新才[1] 潘晶[1] 

机构地区：[1]宁波大学材料科学与化学工程学院宁波市新型功能材料及其制备科学重点实验室,浙江宁波315211 [2]宁波大学理学院,浙江宁波315211

出　　处：《中国稀土学报》2013年第6期667-673,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(51174121和51274125);浙江省重大科技专项(2008C11086-1);浙江省重点科技创新团队项目(2010R50016-8);宁波大学王宽诚幸福基金资助

摘　　要：测量和分析了热压热变形各向异性纳米晶Nd—Fe—B磁体磁取向度I、整个磁体的易磁化轴与热变形压力方向的夹角a，磁体密度ρ，主相体积百分数1-β，磁化强度的关系，拟合出2和5T充磁磁场时具有不同磁取向度热变形磁体的磁化强度分别为MS2=（1-β）Ms ρ／ρ0（1—0．35108／I^2＋0．18622／I^4）和Ms5=（1-β）Msm ρ／ρ0（1—0．19326／I^2＋0．09545／I^4），并与已有相关文献的实验数据的测量值进行了计算比对，发现2和5T充磁场时的计算值与实测值的误差分别在9．05％和0．89％。在1123～1163K范围热变形，钕铁硼磁体的磁取向度、2和5T时磁化强度均是先增加后减小，在1148K时达到最大值1．894，1．337和1．386T。消除热变形粗晶粒带和晶粒混乱区，将提高热变形磁体的磁取向度和磁化强度。The orientation degree I, the angle a between the easy magnetization axis of the whole magnet with the die-upset stress direction, the magnet density p, the volume fraction of the main magnetic phase and the magnetization of the anisotropic nanocrystalline Nd-Fe-B were measured or analyzed. The fitting for- mulas between the magnetization and the orientation degree magetizing at 2 and 5 T, were MS2=（1-β）Ms ρ/ρ0（1-0.35108/I^2＋0.18622/I^4） and Ms5=（1-β）Msm ρ/ρ0（1-0.19326/I^2＋0.09545/I^4）,respectiviely. The relative error was 9. 05% and 0. 89% compared with the data of the related litera- tures. When the die-upset temperature was at 1123 1163 K, both the orientation degree and the magnetization of the magnets first increased and then decreased at 2 and 5 T. The maximum of the orientation degree and the magnetization was 1. 894, 1. 337 and 1. 386 T respectively. If the coarse grain belts and disorientation areas were eliminated, the orientation degree and the magnetization would be improved.

关 键 词：拟合公式 磁化强度 取向度 纳米晶 永磁材料 热变形 

分 类 号：TB332[一般工业技术—材料科学与工程]