富稀土合金添加对烧结(MM,PrNd)-Fe-B微观组织和磁性能的影响  

Effect of rare earth rich alloy addition on microstructure and magnetic properties of sintered(MM,PrNd)-Fe-B

作　　者：徐吉元 徐雅芬 周鸣鸽[1] 陈红升[1] 韩瑞[1] 董生智[1] XU Jiyuan;XU Yafen;ZHOU Mingge;CHEN Hongsheng;HAN Rui;DONG Shengzhi(Research Institute of function Materials,Central Iron and Steel Research Institute,Beijing 100081,China;Shanghai Aerospace Control Technology Institute,Shanghai 201109,China)

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 [2]上海航天控制技术研究所,上海201109

出　　处：《粉末冶金工业》2022年第2期27-33,共7页Powder Metallurgy Industry

基　　金：钢铁研究总院自主投入研发基金资助(20021820A)。

摘　　要：本文采用粉末冶金工艺制备了含有混合稀土的烧结(MM,PrNd)-Fe-B磁体,并研究了富稀土合金添加对磁体微观组织和磁性能的影响。未添加富稀土合金的MM_(7)(PrNd)_(24)Fe_(74.99)B_(1.01)磁体晶界相中存在La、Ce元素聚集现象,添加6%的(PrNd)_(41)Fe_(57.99)B_(1.01)富稀土合金能够部分消除这种聚集现象,同时矫顽力从11.15 kOe提高至11.98 kOe。微观分析表明,添加富稀土合金后,磁体具有双主相结构。晶界中的La、Ce会置换(PrNd)(2)Fe_(14)B主相中Pr、Nd元素,同时Pr、Nd会置换(MM,PrNd)(2)Fe_(14)B主相中La、Ce元素。晶界中La、Ce元素的均匀分布和双主相结构有助于提升磁体的矫顽力。In this paper,sintered(MM,PrNd)-Fe-B magnets containing mischmetal(MM)were prepared by conventional powder metallurgy process,and the effects of rare earth rich alloy on the microstructure and magnetic properties of the magnets were studied.The aggregation of La and Ce in the grain boundary of MM_(7)(PrNd)_(24)Fe_(74.99)B_(1.01)magnet without rare earth rich alloy,can be eliminated by adding 6%of(PrNd)_(41)Fe_(57.99)B_(1.01)rare earth rich alloy,and the coercivity of magnet can be increased from 11.15 kOe to 11.98 kOe.Microstructure analysis shows that,after adding rare earth rich alloy,there is a double main phase structure in the magnet.Pr and Nd in(PrNd)_(2)Fe_(14)B are replaced by La and Ce,with La and Ce in(MM,PrNd)_(2)Fe_(14)B being replaced by Pr and Nd.The coercivity of the magnet is improved by the uniform distribution of La and Ce in the grain boundary and the dual main phase structure.

关 键 词：混合稀土 (MM PrNd)-Fe-B 晶界相 矫顽力 

分 类 号：TG132.27[一般工业技术—材料科学与工程]