烧结[Y_(0.15)(Pr_(0.20)Nd_(0.80))_(0.85)]-Fe-B-M的磁性能和力学性能研究  

Magnetic and Mechanical Properties of Sintered[Y_(0.15)(Pr_(0.20)Nd_(0.80))_(0.85)]-Fe-B-M Magnet

作　　者：徐吉元 孟睿阳 张家滕 陈红升[1] 董生智[1] 方以坤[1] Xu Jiyuan;Meng Ruiyang;Zhang Jiateng;Chen Hongsheng;Dong Shengzhi;Fang Yikun(Division of Functional Materials,Central Iron&Steel Research Institute)

机构地区：[1]钢铁研究总院有限公司功能材料研究院,北京100081

出　　处：《中国稀土学报》2022年第5期785-792,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家重点研发计划项目(2021YFB3502900);钢铁研究总院自主投入专项基金项目(20021820A)资助。

摘　　要：以成分为[Y_(0.15)(Pr_(0.20)Nd_(0.80))_(0.85)]_(31.5)Fe_(bal)B_(1.01)M_(0.72)(M=Al,Cu,Nb)的烧结磁体为主要研究对象,研究了含Y磁体的变温磁性能、力学性能及温度与反向磁场联合作用下磁体的不可逆磁通损失,并对磁体微观组织和断口形貌进行了表征,同时与相同替代量下的Ce磁体进行了对比。结果表明,与Ce磁体相比,Y磁体具有更低的剩磁温度系数和更高的使用温度和抗弯强度。相同温度下,随着反向磁场的增大,会使Y磁体和Ce磁体不可逆磁损增大,最高使用温度降低。微观分析发现,Y和Ce元素在磁体中的分布具有显著差异,Y元素倾向于分布在2-14-1主相中,而Ce元素倾向于在晶界中,这可能是导致Y磁体抗弯强度得到提升的原因之一。断口形貌分析发现,Y磁体与Ce磁体和普通烧结Nd-Fe-B一样都属于脆性沿晶断裂。In this paper,the sintered magnet with composition[Y_(0.15)(Pr_(0.20)Nd_(0.80))_(0.85)]_(31.5)Fe_(bal)B_(1.01)M_(0.72)(M=Al,Cu,Nb)was taken as the main research object.The magnetic properties with variable temperature,mechanical properties and irreversible flux loss of the Y magnet under the combined action of temperature and reverse magnetic field were studied.The microstructure and fracture morphology of the magnet were characterized,and compared with the Ce magnet under the same replacement amount.The results show that compared with Ce magnet,Y magnet has lower remanence temperature coefficient,higher service temperature and bending strength.At the same temperature,with the increase of the reverse magnetic field,the irreversible flux loss of Y magnet and Ce magnet increase,and the maximum service temperature decrease.The microscopic analysis shows that the distribution of Y and Ce elements in the magnet is significantly different.Y tends to be distributed in the 2-14-1main phase,while Ce tends to be in the grain boundary,which may be one of the reasons for the improvement of the bending strength of Y magnet.The fracture morphology analysis shows that Y magnet,Ce magnet and ordinary sintered Nd-Fe-B belong to brittle inter-granular fracture.

关 键 词：Y磁体 磁性能 力学性能 反向磁场 不可逆磁损 

分 类 号：TM273[一般工业技术—材料科学与工程]